Central Islip weather in July
In July, Central Islip sees average daytime highs of 77°F and overnight lows near 71°F, with 3.3 in of rain across 9.4 wet days and about 14.6 hours of daylight. It is the 1st-warmest and 12th-wettest month of the year here.
Day-to-day highs hold fairly steady near 77°F through the month. The sky is clear or mostly clear about 36% of the time in July, and the air most often feels muggy.
Daylight stretches from about 14 h 54 min at the start of July to 14 h 12 min by month's end. Set against the rest of the year, July is Central Islip's 4th-clearest and 11th-windiest month. For the whole year in context, see Central Islip's year-round climate.
- Daytime high
- 77°
- 1st warmest
- Overnight low
- 71°
- 12th coldest
- Rainfall
- 3.3 in
- 9.4 wet days
- Daylight
- 14 h 42 min
- 4:39 AM – 7:18 PM
- Cloud cover
- 55%
- 4th clearest
- Wind
- 9 mph
- 11th windiest
- Solar energy
- 6.34 kWh/m²
- Travel score
- 7.0
- out of 10
Central Islip is census-designated place in Suffolk County, New York.
- Density
- 1,871/km²
- people per km²
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in July
Day-to-day highs hold fairly steady near 77°F through the month.
A typical July day in Central Islip reaches about 77°F in the afternoon and slips back to 71°F overnight — a 6°F spread between the day's warmth and the night's chill. On most days the high lands between 72°F and 83°F. Set against its neighbours, July runs about 6°F warmer than June and on par with August.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 76 | 76 | 76 | 76 | 76 | 76 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 78 | 78 | 78 | 78 | 78 | 78 | 78 | 78 | 78 | 78 | 78 | 78 | 78 | 78 | 78 | 78 | 78 | 78 |
| Avg low (°F) | 69 | 69 | 69 | 70 | 70 | 70 | 70 | 70 | 70 | 71 | 71 | 71 | 71 | 71 | 71 | 71 | 71 | 71 | 71 | 72 | 72 | 72 | 72 | 72 | 72 | 72 | 72 | 72 | 72 | 72 | 72 |
| Avg high (°F) | Avg low (°F) | |
|---|---|---|
| 1 | 76 | 69 |
| 2 | 76 | 69 |
| 3 | 76 | 69 |
| 4 | 76 | 70 |
| 5 | 76 | 70 |
| 6 | 76 | 70 |
| 7 | 77 | 70 |
| 8 | 77 | 70 |
| 9 | 77 | 70 |
| 10 | 77 | 71 |
| 11 | 77 | 71 |
| 12 | 77 | 71 |
| 13 | 77 | 71 |
| 14 | 78 | 71 |
| 15 | 78 | 71 |
| 16 | 78 | 71 |
| 17 | 78 | 71 |
| 18 | 78 | 71 |
| 19 | 78 | 71 |
| 20 | 78 | 72 |
| 21 | 78 | 72 |
| 22 | 78 | 72 |
| 23 | 78 | 72 |
| 24 | 78 | 72 |
| 25 | 78 | 72 |
| 26 | 78 | 72 |
| 27 | 78 | 72 |
| 28 | 78 | 72 |
| 29 | 78 | 72 |
| 30 | 78 | 72 |
| 31 | 78 | 72 |
How July really feels in Central Islip
Once humidity and wind are folded in, July averages 0 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.
July sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Central Islip weather by month
How July compares with the rest of the year at a glance. July is the 1st-warmest and 12th-wettest month here — the current month is highlighted below.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 39° / 30° | 3.8 | 9.9 | 4 | 9.4 | 0.0 |
| Feb | 39° / 30° | 3.5 | 9.3 | 3.7 | 10.4 | 0.0 |
| Mar | 44° / 35° | 4.6 | 10.6 | 2.9 | 11.7 | 0.8 |
| Apr | 53° / 44° | 3.8 | 10.9 | 0.4 | 13.1 | 2.8 |
| May | 61° / 54° | 3.5 | 10.8 | 0 | 14.2 | 5.0 |
| Jun | 71° / 64° | 3.6 | 9.9 | 0 | 14.9 | 6.6 |
| Jul | 77° / 71° | 3.3 | 9.4 | 0 | 14.6 | 7.0 |
| Aug | 77° / 70° | 3.9 | 9.5 | 0 | 13.6 | 7.1 |
| Sep | 71° / 64° | 3.8 | 9.1 | 0 | 12.3 | 6.9 |
| Oct | 62° / 55° | 4.4 | 9.2 | 0 | 10.9 | 5.5 |
| Nov | 53° / 44° | 3.7 | 8.9 | 0.3 | 9.7 | 3.0 |
| Dec | 44° / 36° | 4.8 | 10.6 | 2.3 | 9.1 | 0.9 |
Cloud cover in July
The sky is clear or mostly clear about 36% of the time in July.
Beyond those clear spells, partly cloudy skies cover about 19% of July, with mostly cloudy or overcast conditions the remaining 45%.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 52 | 52 | 53 | 54 | 54 | 55 | 55 | 55 | 56 | 56 | 56 | 57 | 57 | 57 | 56 | 56 | 55 | 55 | 55 | 54 | 54 | 54 | 53 | 53 | 54 | 53 | 54 | 54 | 55 | 55 | 56 |
| Cloudier (%) | 48 | 48 | 47 | 46 | 46 | 45 | 45 | 45 | 44 | 44 | 44 | 43 | 43 | 43 | 44 | 44 | 45 | 45 | 45 | 46 | 46 | 46 | 47 | 47 | 46 | 47 | 46 | 46 | 45 | 45 | 44 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 52 | 48 |
| 2 | 52 | 48 |
| 3 | 53 | 47 |
| 4 | 54 | 46 |
| 5 | 54 | 46 |
| 6 | 55 | 45 |
| 7 | 55 | 45 |
| 8 | 55 | 45 |
| 9 | 56 | 44 |
| 10 | 56 | 44 |
| 11 | 56 | 44 |
| 12 | 57 | 43 |
| 13 | 57 | 43 |
| 14 | 57 | 43 |
| 15 | 56 | 44 |
| 16 | 56 | 44 |
| 17 | 55 | 45 |
| 18 | 55 | 45 |
| 19 | 55 | 45 |
| 20 | 54 | 46 |
| 21 | 54 | 46 |
| 22 | 54 | 46 |
| 23 | 53 | 47 |
| 24 | 53 | 47 |
| 25 | 54 | 46 |
| 26 | 53 | 47 |
| 27 | 54 | 46 |
| 28 | 54 | 46 |
| 29 | 55 | 45 |
| 30 | 55 | 45 |
| 31 | 56 | 44 |
Chance of precipitation in July
Central Islip gets around 3.3 in of rain over 9.4 wet days in July, the driest month. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 30% and peaks near 33% on the wettest days.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 31 | 31 | 31 | 30 | 30 | 30 | 30 | 30 | 29 | 29 | 29 | 28 | 28 | 28 | 28 | 28 | 29 | 29 | 30 | 30 | 31 | 31 | 31 | 31 | 32 | 32 | 32 | 32 | 33 | 33 | 33 |
| Rain chance (%) | |
|---|---|
| 1 | 31 |
| 2 | 31 |
| 3 | 31 |
| 4 | 30 |
| 5 | 30 |
| 6 | 30 |
| 7 | 30 |
| 8 | 30 |
| 9 | 29 |
| 10 | 29 |
| 11 | 29 |
| 12 | 28 |
| 13 | 28 |
| 14 | 28 |
| 15 | 28 |
| 16 | 28 |
| 17 | 29 |
| 18 | 29 |
| 19 | 30 |
| 20 | 30 |
| 21 | 31 |
| 22 | 31 |
| 23 | 31 |
| 24 | 31 |
| 25 | 32 |
| 26 | 32 |
| 27 | 32 |
| 28 | 32 |
| 29 | 33 |
| 30 | 33 |
| 31 | 33 |
Humidity in July
Most of July feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, July lands in the muggy band about 39% of days. Sticky, muggy-or-worse air turns up on roughly 65% of them.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 4 | 4 | 4 | 4 | 4 | 3 | 3 | 3 | 3 | 2 | 2 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Comfortable (%) | 12 | 12 | 12 | 11 | 11 | 11 | 11 | 11 | 11 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 10 |
| Humid (%) | 32 | 31 | 31 | 30 | 30 | 29 | 29 | 28 | 27 | 26 | 25 | 25 | 24 | 23 | 22 | 22 | 21 | 20 | 20 | 19 | 19 | 19 | 18 | 18 | 18 | 18 | 19 | 19 | 19 | 19 | 19 |
| Muggy (%) | 41 | 41 | 41 | 41 | 41 | 41 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 39 | 39 | 39 | 39 | 38 | 38 | 38 | 38 | 37 | 37 | 37 | 36 | 36 | 36 | 36 | 36 | 36 | 35 |
| Oppressive (%) | 10 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 21 | 22 | 23 | 24 | 25 | 27 | 27 | 28 | 29 | 30 | 31 | 32 | 32 | 33 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 |
| Miserable (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|---|---|
| 1 | 4 | 12 | 32 | 41 | 10 | 0 |
| 2 | 4 | 12 | 31 | 41 | 12 | 0 |
| 3 | 4 | 12 | 31 | 41 | 13 | 0 |
| 4 | 4 | 11 | 30 | 41 | 14 | 0 |
| 5 | 4 | 11 | 30 | 41 | 15 | 0 |
| 6 | 3 | 11 | 29 | 41 | 16 | 0 |
| 7 | 3 | 11 | 29 | 40 | 17 | 0 |
| 8 | 3 | 11 | 28 | 40 | 18 | 0 |
| 9 | 3 | 11 | 27 | 40 | 19 | 0 |
| 10 | 2 | 10 | 26 | 40 | 21 | 0 |
| 11 | 2 | 10 | 25 | 40 | 22 | 0 |
| 12 | 2 | 10 | 25 | 40 | 23 | 0 |
| 13 | 2 | 10 | 24 | 40 | 24 | 0 |
| 14 | 2 | 10 | 23 | 39 | 25 | 0 |
| 15 | 2 | 10 | 22 | 39 | 27 | 1 |
| 16 | 1 | 10 | 22 | 39 | 27 | 1 |
| 17 | 1 | 10 | 21 | 39 | 28 | 1 |
| 18 | 1 | 10 | 20 | 38 | 29 | 1 |
| 19 | 1 | 10 | 20 | 38 | 30 | 1 |
| 20 | 1 | 10 | 19 | 38 | 31 | 1 |
| 21 | 1 | 10 | 19 | 38 | 32 | 1 |
| 22 | 1 | 10 | 19 | 37 | 32 | 1 |
| 23 | 1 | 10 | 18 | 37 | 33 | 1 |
| 24 | 1 | 9 | 18 | 37 | 34 | 1 |
| 25 | 1 | 9 | 18 | 36 | 34 | 1 |
| 26 | 1 | 9 | 18 | 36 | 34 | 1 |
| 27 | 1 | 9 | 19 | 36 | 34 | 1 |
| 28 | 1 | 9 | 19 | 36 | 34 | 1 |
| 29 | 1 | 9 | 19 | 36 | 34 | 1 |
| 30 | 1 | 9 | 19 | 36 | 34 | 1 |
| 31 | 1 | 10 | 19 | 35 | 34 | 1 |
Wind in July
Winds average 9 mph in July.
Across July, daily wind ranges from about 8 mph on the calmest days to 9 mph at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (mph) | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 8 |
| Feels | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze |
| Wind speed (mph) | Feels | |
|---|---|---|
| 1 | 9 | light breeze |
| 2 | 9 | light breeze |
| 3 | 9 | light breeze |
| 4 | 9 | light breeze |
| 5 | 9 | light breeze |
| 6 | 9 | light breeze |
| 7 | 9 | light breeze |
| 8 | 9 | light breeze |
| 9 | 9 | light breeze |
| 10 | 9 | light breeze |
| 11 | 9 | light breeze |
| 12 | 9 | light breeze |
| 13 | 9 | light breeze |
| 14 | 9 | light breeze |
| 15 | 9 | light breeze |
| 16 | 9 | light breeze |
| 17 | 9 | light breeze |
| 18 | 9 | light breeze |
| 19 | 9 | light breeze |
| 20 | 9 | light breeze |
| 21 | 9 | light breeze |
| 22 | 9 | light breeze |
| 23 | 9 | light breeze |
| 24 | 9 | light breeze |
| 25 | 9 | light breeze |
| 26 | 9 | light breeze |
| 27 | 9 | light breeze |
| 28 | 9 | light breeze |
| 29 | 9 | light breeze |
| 30 | 9 | light breeze |
| 31 | 8 | light breeze |
Sunrise & sunset in July
Daylight runs from about 14 h 54 min at the start of July to 14 h 12 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 42 minutes over July. Sunrise moves from 4:29 AM to 4:52 AM, and sunset from 7:23 PM to 7:06 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 14.9 | 14.9 | 14.9 | 14.9 | 14.9 | 14.8 | 14.8 | 14.8 | 14.8 | 14.8 | 14.8 | 14.7 | 14.7 | 14.7 | 14.7 | 14.7 | 14.6 | 14.6 | 14.6 | 14.6 | 14.5 | 14.5 | 14.5 | 14.5 | 14.4 | 14.4 | 14.4 | 14.3 | 14.3 | 14.3 | 14.2 |
| Sunrise (AM) | 4:29 | 4:30 | 4:30 | 4:31 | 4:31 | 4:32 | 4:33 | 4:33 | 4:34 | 4:34 | 4:35 | 4:36 | 4:36 | 4:37 | 4:38 | 4:39 | 4:40 | 4:40 | 4:41 | 4:42 | 4:43 | 4:44 | 4:45 | 4:45 | 4:46 | 4:47 | 4:48 | 4:49 | 4:50 | 4:51 | 4:52 |
| Sunset (PM) | 7:23 | 7:23 | 7:23 | 7:23 | 7:22 | 7:22 | 7:22 | 7:22 | 7:21 | 7:21 | 7:21 | 7:20 | 7:20 | 7:19 | 7:19 | 7:18 | 7:18 | 7:17 | 7:16 | 7:16 | 7:15 | 7:14 | 7:13 | 7:12 | 7:12 | 7:11 | 7:10 | 7:09 | 7:08 | 7:07 | 7:06 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 14.9 | 4:29 | 7:23 |
| 2 | 14.9 | 4:30 | 7:23 |
| 3 | 14.9 | 4:30 | 7:23 |
| 4 | 14.9 | 4:31 | 7:23 |
| 5 | 14.9 | 4:31 | 7:22 |
| 6 | 14.8 | 4:32 | 7:22 |
| 7 | 14.8 | 4:33 | 7:22 |
| 8 | 14.8 | 4:33 | 7:22 |
| 9 | 14.8 | 4:34 | 7:21 |
| 10 | 14.8 | 4:34 | 7:21 |
| 11 | 14.8 | 4:35 | 7:21 |
| 12 | 14.7 | 4:36 | 7:20 |
| 13 | 14.7 | 4:36 | 7:20 |
| 14 | 14.7 | 4:37 | 7:19 |
| 15 | 14.7 | 4:38 | 7:19 |
| 16 | 14.7 | 4:39 | 7:18 |
| 17 | 14.6 | 4:40 | 7:18 |
| 18 | 14.6 | 4:40 | 7:17 |
| 19 | 14.6 | 4:41 | 7:16 |
| 20 | 14.6 | 4:42 | 7:16 |
| 21 | 14.5 | 4:43 | 7:15 |
| 22 | 14.5 | 4:44 | 7:14 |
| 23 | 14.5 | 4:45 | 7:13 |
| 24 | 14.5 | 4:45 | 7:12 |
| 25 | 14.4 | 4:46 | 7:12 |
| 26 | 14.4 | 4:47 | 7:11 |
| 27 | 14.4 | 4:48 | 7:10 |
| 28 | 14.3 | 4:49 | 7:09 |
| 29 | 14.3 | 4:50 | 7:08 |
| 30 | 14.3 | 4:51 | 7:07 |
| 31 | 14.2 | 4:52 | 7:06 |
Solar energy in July
Average shortwave solar energy reaching the ground each day in July, about 6.34 kWh/m².
For context, solar energy here swings from a low near 1.76 kWh/m² to a high of 6.38 kWh/m² in June across the year — July's 6.34 kWh/m² sits near the top of that range.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 6.6 | 6.6 | 6.6 | 6.6 | 6.6 | 6.6 | 6.6 | 6.6 | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 | 6.4 | 6.4 | 6.4 | 6.3 | 6.3 | 6.3 | 6.3 | 6.2 | 6.2 | 6.2 | 6.1 | 6.1 | 6.1 | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 |
| Level | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 6.6 | Intense |
| 2 | 6.6 | Intense |
| 3 | 6.6 | Intense |
| 4 | 6.6 | Intense |
| 5 | 6.6 | Intense |
| 6 | 6.6 | Intense |
| 7 | 6.6 | Intense |
| 8 | 6.6 | Intense |
| 9 | 6.5 | Intense |
| 10 | 6.5 | Intense |
| 11 | 6.5 | Intense |
| 12 | 6.5 | Intense |
| 13 | 6.5 | Intense |
| 14 | 6.4 | Intense |
| 15 | 6.4 | Intense |
| 16 | 6.4 | Intense |
| 17 | 6.3 | Intense |
| 18 | 6.3 | Intense |
| 19 | 6.3 | Intense |
| 20 | 6.3 | Intense |
| 21 | 6.2 | Intense |
| 22 | 6.2 | Intense |
| 23 | 6.2 | Intense |
| 24 | 6.1 | Intense |
| 25 | 6.1 | Intense |
| 26 | 6.1 | Intense |
| 27 | 6.0 | Intense |
| 28 | 6.0 | Intense |
| 29 | 6.0 | Intense |
| 30 | 6.0 | Intense |
| 31 | 6.0 | Bright |
Hazard calendar for Central Islip
In July, Central Islip sits inside its atlantic hurricane season. The full year is below, with each hazard's peak months called out.
Central Islip sits in the Atlantic hurricane belt; the season peaks August–October.
Is July a good time to visit Central Islip?
Our two travel scores rate July for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
July is one of the better times to visit Central Islip for general sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Central Islip in July
From July's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In July, Central Islip sees daytime highs around 77°F and nights near 71°F. Pack sun protection. Worth having: light clothes and rain gear. About 9 days see rain.
Sea temperature near Central Islip in July
The nearest coast averages about 72°F in July — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 12 mi away) is warmest in August at about 73°F and coldest in February near 40°F.
It's comfortable for a long swim from Jul 3 to Sep 23 — about 2.7 months when the water holds above 68°F.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°F) | 43 | 40 | 40 | 45 | 54 | 64 | 72 | 73 | 70 | 63 | 55 | 49 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Cool | Refreshing | Refreshing | Refreshing | Cool | Bracing | Bracing |
| Sea temperature (°F) | Comfort | |
|---|---|---|
| Jan | 43 | Bracing |
| Feb | 40 | Bracing |
| Mar | 40 | Bracing |
| Apr | 45 | Bracing |
| May | 54 | Bracing |
| Jun | 64 | Cool |
| Jul | 72 | Refreshing |
| Aug | 73 | Refreshing |
| Sep | 70 | Refreshing |
| Oct | 63 | Cool |
| Nov | 55 | Bracing |
| Dec | 49 | Bracing |
UV index in Central Islip in July
Clear-sky midday UV in July peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Central Islip peaks around July 11 at about 8 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 22 at about 1 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 3 | 5 | 6 | 7 | 8 | 8 | 6 | 6 | 3 | 2 | 1 |
| Level | Low | Moderate | Moderate | High | Very high | Very high | Very high | High | High | Moderate | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Low |
| Feb | 3 | Moderate |
| Mar | 5 | Moderate |
| Apr | 6 | High |
| May | 7 | Very high |
| Jun | 8 | Very high |
| Jul | 8 | Very high |
| Aug | 6 | High |
| Sep | 6 | High |
| Oct | 3 | Moderate |
| Nov | 2 | Moderate |
| Dec | 1 | Low |
Air quality in Central Islip in July
Average fine-particle pollution (PM2.5) through the year — so you can see where July falls, not just the annual average.
Air quality in Central Islip is worst in July — around 19 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (November, 9 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 11 | 13 | 15 | 16 | 18 | 18 | 19 | 16 | 13 | 10 | 9 | 10 |
| Level | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 11 | Good |
| Feb | 13 | Moderate |
| Mar | 15 | Moderate |
| Apr | 16 | Moderate |
| May | 18 | Moderate |
| Jun | 18 | Moderate |
| Jul | 19 | Moderate |
| Aug | 16 | Moderate |
| Sep | 13 | Moderate |
| Oct | 10 | Good |
| Nov | 9 | Good |
| Dec | 10 | Good |
Where is Central Islip?
Central Islip sits at 40.8°N, 73.2°W, 89 ft above sea level, in United States. The nearest listed city is Brentwood, 2.5 mi away.
Topography around Central Islip
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Central Islip.
Within 2 miles, the terrain around Central Islip has only modest variations in elevation — a maximum elevation change of 210 ft around an average of 89 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 361 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,207 ft.
The land around Central Islip is covered by trees (50%), artificial surfaces (29%) and grassland (21%) within 2 miles, trees (53%) and water (20%) within 10 miles, and water (52%) and trees (34%) within 50 miles.
United States travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 100% of US
- price level, 2025
- GDP per capita
- $90,027
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 5.8
- per 100k, 2023
- Road deaths
- 12.7
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Central Islip (40.7906°, -73.2018°, elevation 89 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).