Flatlands weather in September
In September, Flatlands sees average daytime highs of 73°F and overnight lows near 64°F, with 3.9 in of rain across 9.5 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 5th-wettest month of the year here.
Highs ease over the month, from about 77°F in the first days to 69°F by the end. The sky is clear or mostly clear about 38% of the time in September, and the air most often feels dry.
Daylight stretches from about 12 h 54 min at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Flatlands's 2nd-clearest and 9th-windiest month. For the whole year in context, see Flatlands's year-round climate.
- Daytime high
- 73°
- 4th warmest
- Overnight low
- 64°
- 9th coldest
- Rainfall
- 3.9 in
- 9.5 wet days
- Daylight
- 12 h 18 min
- 5:42 AM – 5:58 PM
- Cloud cover
- 54%
- 2nd clearest
- Wind
- 9 mph
- 9th windiest
- Solar energy
- 4.22 kWh/m²
- Travel score
- 6.9
- out of 10
Temperature in September
Highs ease over the month, from about 77°F in the first days to 69°F by the end.
A typical September day in Flatlands reaches about 73°F in the afternoon and slips back to 64°F overnight — a 10°F spread between the day's warmth and the night's chill. On most days the high lands between 67°F and 80°F. Set against its neighbours, September runs about 6°F cooler than August and about 10°F warmer than October.
| 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 77 | 77 | 77 | 77 | 76 | 76 | 76 | 76 | 75 | 75 | 75 | 74 | 74 | 74 | 74 | 73 | 73 | 73 | 72 | 72 | 72 | 71 | 71 | 71 | 71 | 70 | 70 | 69 | 69 | 69 |
| Avg low (°F) | 68 | 68 | 67 | 67 | 67 | 67 | 67 | 66 | 66 | 66 | 65 | 65 | 65 | 64 | 64 | 64 | 63 | 63 | 63 | 62 | 62 | 62 | 61 | 61 | 61 | 60 | 60 | 60 | 59 | 59 |
| Avg high (°F) | Avg low (°F) | |
|---|---|---|
| 1 | 77 | 68 |
| 2 | 77 | 68 |
| 3 | 77 | 67 |
| 4 | 77 | 67 |
| 5 | 76 | 67 |
| 6 | 76 | 67 |
| 7 | 76 | 67 |
| 8 | 76 | 66 |
| 9 | 75 | 66 |
| 10 | 75 | 66 |
| 11 | 75 | 65 |
| 12 | 74 | 65 |
| 13 | 74 | 65 |
| 14 | 74 | 64 |
| 15 | 74 | 64 |
| 16 | 73 | 64 |
| 17 | 73 | 63 |
| 18 | 73 | 63 |
| 19 | 72 | 63 |
| 20 | 72 | 62 |
| 21 | 72 | 62 |
| 22 | 71 | 62 |
| 23 | 71 | 61 |
| 24 | 71 | 61 |
| 25 | 71 | 61 |
| 26 | 70 | 60 |
| 27 | 70 | 60 |
| 28 | 69 | 60 |
| 29 | 69 | 59 |
| 30 | 69 | 59 |
How September really feels in Flatlands
Once humidity and wind are folded in, September 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.
September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Flatlands weather by month
How September compares with the rest of the year at a glance. September is the 4th-warmest and 5th-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° / 29° | 3.6 | 9.8 | 3.9 | 9.4 | 0.0 |
| Feb | 40° / 29° | 3.4 | 8.9 | 3.5 | 10.4 | 0.1 |
| Mar | 47° / 36° | 4.5 | 10.5 | 2.6 | 11.7 | 1.4 |
| Apr | 56° / 46° | 3.8 | 10.9 | 0.3 | 13 | 3.7 |
| May | 65° / 55° | 3.5 | 11 | 0 | 14.2 | 5.7 |
| Jun | 75° / 65° | 3.9 | 11 | 0 | 14.8 | 6.6 |
| Jul | 80° / 71° | 3.8 | 11 | 0 | 14.6 | 6.4 |
| Aug | 79° / 70° | 3.9 | 10.2 | 0 | 13.6 | 6.7 |
| Sep | 73° / 64° | 3.9 | 9.5 | 0 | 12.3 | 6.9 |
| Oct | 63° / 53° | 4.2 | 8.8 | 0 | 10.9 | 5.8 |
| Nov | 53° / 43° | 3.4 | 8.6 | 0.3 | 9.7 | 3.1 |
| Dec | 44° / 35° | 4.4 | 10 | 1.9 | 9.1 | 0.8 |
Cloud cover in September
The sky is clear or mostly clear about 38% of the time in September.
Beyond those clear spells, partly cloudy skies cover about 16% of September, with mostly cloudy or overcast conditions the remaining 46%.
| 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 57 | 57 | 57 | 57 | 57 | 57 | 56 | 56 | 56 | 56 | 55 | 55 | 55 | 54 | 55 | 54 | 53 | 52 | 52 | 51 | 51 | 50 | 51 | 51 | 51 | 51 | 52 | 52 | 53 | 53 |
| Cloudier (%) | 43 | 43 | 43 | 43 | 43 | 43 | 44 | 44 | 44 | 44 | 45 | 45 | 45 | 46 | 45 | 46 | 47 | 48 | 48 | 49 | 49 | 50 | 49 | 49 | 49 | 49 | 48 | 48 | 47 | 47 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 57 | 43 |
| 2 | 57 | 43 |
| 3 | 57 | 43 |
| 4 | 57 | 43 |
| 5 | 57 | 43 |
| 6 | 57 | 43 |
| 7 | 56 | 44 |
| 8 | 56 | 44 |
| 9 | 56 | 44 |
| 10 | 56 | 44 |
| 11 | 55 | 45 |
| 12 | 55 | 45 |
| 13 | 55 | 45 |
| 14 | 54 | 46 |
| 15 | 55 | 45 |
| 16 | 54 | 46 |
| 17 | 53 | 47 |
| 18 | 52 | 48 |
| 19 | 52 | 48 |
| 20 | 51 | 49 |
| 21 | 51 | 49 |
| 22 | 50 | 50 |
| 23 | 51 | 49 |
| 24 | 51 | 49 |
| 25 | 51 | 49 |
| 26 | 51 | 49 |
| 27 | 52 | 48 |
| 28 | 52 | 48 |
| 29 | 53 | 47 |
| 30 | 53 | 47 |
Chance of precipitation in September
Flatlands gets around 3.9 in of rain over 9.5 wet days in September. 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 32% 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 28 | 28 | 29 | 29 | 29 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 31 | 31 | 31 | 31 | 31 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 31 | 31 |
| Rain chance (%) | |
|---|---|
| 1 | 28 |
| 2 | 28 |
| 3 | 29 |
| 4 | 29 |
| 5 | 29 |
| 6 | 30 |
| 7 | 30 |
| 8 | 30 |
| 9 | 30 |
| 10 | 30 |
| 11 | 30 |
| 12 | 30 |
| 13 | 30 |
| 14 | 30 |
| 15 | 30 |
| 16 | 30 |
| 17 | 31 |
| 18 | 31 |
| 19 | 31 |
| 20 | 31 |
| 21 | 31 |
| 22 | 32 |
| 23 | 32 |
| 24 | 32 |
| 25 | 32 |
| 26 | 32 |
| 27 | 32 |
| 28 | 32 |
| 29 | 31 |
| 30 | 31 |
Humidity in September
Most of September feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, September lands in the dry band about 27% of days. Sticky, muggy-or-worse air turns up on roughly 28% 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 9 | 9 | 10 | 12 | 13 | 14 | 15 | 17 | 18 | 19 | 21 | 22 | 24 | 25 | 26 | 28 | 29 | 30 | 31 | 32 | 33 | 35 | 36 | 37 | 39 | 40 | 42 | 43 | 45 | 46 |
| Comfortable (%) | 18 | 18 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 20 | 20 | 20 | 20 | 21 | 21 | 22 | 22 | 22 | 23 | 23 | 23 | 23 | 23 | 23 | 23 |
| Humid (%) | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 27 | 27 | 27 | 26 | 26 | 26 | 25 | 24 | 23 | 22 | 22 | 21 | 20 | 19 | 19 | 18 | 17 |
| Muggy (%) | 28 | 28 | 27 | 26 | 25 | 25 | 24 | 24 | 23 | 23 | 22 | 22 | 22 | 21 | 21 | 21 | 20 | 20 | 20 | 19 | 19 | 18 | 18 | 17 | 16 | 15 | 15 | 14 | 13 | 13 |
| Oppressive (%) | 17 | 16 | 16 | 15 | 15 | 14 | 13 | 12 | 11 | 10 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 4 | 3 | 3 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | |
|---|---|---|---|---|---|
| 1 | 9 | 18 | 28 | 28 | 17 |
| 2 | 9 | 18 | 28 | 28 | 16 |
| 3 | 10 | 19 | 28 | 27 | 16 |
| 4 | 12 | 19 | 28 | 26 | 15 |
| 5 | 13 | 19 | 28 | 25 | 15 |
| 6 | 14 | 19 | 28 | 25 | 14 |
| 7 | 15 | 19 | 28 | 24 | 13 |
| 8 | 17 | 19 | 28 | 24 | 12 |
| 9 | 18 | 19 | 28 | 23 | 11 |
| 10 | 19 | 19 | 28 | 23 | 10 |
| 11 | 21 | 19 | 28 | 22 | 10 |
| 12 | 22 | 19 | 28 | 22 | 9 |
| 13 | 24 | 19 | 28 | 22 | 8 |
| 14 | 25 | 19 | 27 | 21 | 7 |
| 15 | 26 | 20 | 27 | 21 | 6 |
| 16 | 28 | 20 | 27 | 21 | 5 |
| 17 | 29 | 20 | 26 | 20 | 4 |
| 18 | 30 | 20 | 26 | 20 | 4 |
| 19 | 31 | 21 | 26 | 20 | 3 |
| 20 | 32 | 21 | 25 | 19 | 3 |
| 21 | 33 | 22 | 24 | 19 | 2 |
| 22 | 35 | 22 | 23 | 18 | 2 |
| 23 | 36 | 22 | 22 | 18 | 2 |
| 24 | 37 | 23 | 22 | 17 | 1 |
| 25 | 39 | 23 | 21 | 16 | 1 |
| 26 | 40 | 23 | 20 | 15 | 1 |
| 27 | 42 | 23 | 19 | 15 | 1 |
| 28 | 43 | 23 | 19 | 14 | 1 |
| 29 | 45 | 23 | 18 | 13 | 1 |
| 30 | 46 | 23 | 17 | 13 | 1 |
Wind in September
Winds average 9 mph in September.
Across September, 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (mph) | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 |
| 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 |
| Wind speed (mph) | Feels | |
|---|---|---|
| 1 | 8 | light breeze |
| 2 | 8 | light breeze |
| 3 | 8 | light breeze |
| 4 | 8 | light breeze |
| 5 | 8 | light breeze |
| 6 | 8 | light breeze |
| 7 | 8 | light breeze |
| 8 | 8 | light breeze |
| 9 | 8 | light breeze |
| 10 | 8 | light breeze |
| 11 | 8 | light breeze |
| 12 | 8 | light breeze |
| 13 | 8 | light breeze |
| 14 | 8 | light breeze |
| 15 | 8 | light breeze |
| 16 | 8 | light breeze |
| 17 | 8 | light breeze |
| 18 | 8 | 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 |
Sunrise & sunset in September
Daylight runs from about 12 h 54 min at the start of September to 11 h 36 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 78 minutes over September. Sunrise moves from 5:27 AM to 5:56 AM, and sunset from 6:24 PM to 5:34 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 12.9 | 12.9 | 12.9 | 12.8 | 12.8 | 12.7 | 12.7 | 12.6 | 12.6 | 12.5 | 12.5 | 12.4 | 12.4 | 12.4 | 12.3 | 12.3 | 12.2 | 12.2 | 12.1 | 12.1 | 12.0 | 12.0 | 11.9 | 11.9 | 11.9 | 11.8 | 11.8 | 11.7 | 11.7 | 11.6 |
| Sunrise (AM) | 5:27 | 5:28 | 5:29 | 5:30 | 5:31 | 5:32 | 5:33 | 5:34 | 5:35 | 5:36 | 5:37 | 5:38 | 5:39 | 5:40 | 5:41 | 5:42 | 5:43 | 5:44 | 5:45 | 5:46 | 5:47 | 5:48 | 5:49 | 5:50 | 5:51 | 5:52 | 5:53 | 5:54 | 5:55 | 5:56 |
| Sunset (PM) | 6:24 | 6:22 | 6:20 | 6:19 | 6:17 | 6:15 | 6:14 | 6:12 | 6:10 | 6:08 | 6:07 | 6:05 | 6:03 | 6:02 | 6:00 | 5:58 | 5:56 | 5:55 | 5:53 | 5:51 | 5:49 | 5:47 | 5:46 | 5:44 | 5:42 | 5:41 | 5:39 | 5:37 | 5:35 | 5:34 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 12.9 | 5:27 | 6:24 |
| 2 | 12.9 | 5:28 | 6:22 |
| 3 | 12.9 | 5:29 | 6:20 |
| 4 | 12.8 | 5:30 | 6:19 |
| 5 | 12.8 | 5:31 | 6:17 |
| 6 | 12.7 | 5:32 | 6:15 |
| 7 | 12.7 | 5:33 | 6:14 |
| 8 | 12.6 | 5:34 | 6:12 |
| 9 | 12.6 | 5:35 | 6:10 |
| 10 | 12.5 | 5:36 | 6:08 |
| 11 | 12.5 | 5:37 | 6:07 |
| 12 | 12.4 | 5:38 | 6:05 |
| 13 | 12.4 | 5:39 | 6:03 |
| 14 | 12.4 | 5:40 | 6:02 |
| 15 | 12.3 | 5:41 | 6:00 |
| 16 | 12.3 | 5:42 | 5:58 |
| 17 | 12.2 | 5:43 | 5:56 |
| 18 | 12.2 | 5:44 | 5:55 |
| 19 | 12.1 | 5:45 | 5:53 |
| 20 | 12.1 | 5:46 | 5:51 |
| 21 | 12.0 | 5:47 | 5:49 |
| 22 | 12.0 | 5:48 | 5:47 |
| 23 | 11.9 | 5:49 | 5:46 |
| 24 | 11.9 | 5:50 | 5:44 |
| 25 | 11.9 | 5:51 | 5:42 |
| 26 | 11.8 | 5:52 | 5:41 |
| 27 | 11.8 | 5:53 | 5:39 |
| 28 | 11.7 | 5:54 | 5:37 |
| 29 | 11.7 | 5:55 | 5:35 |
| 30 | 11.6 | 5:56 | 5:34 |
Solar energy in September
Average shortwave solar energy reaching the ground each day in September, about 4.22 kWh/m².
For context, solar energy here swings from a low near 1.77 kWh/m² to a high of 6.05 kWh/m² in June across the year — September's 4.22 kWh/m² falls in the middle.
| 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 4.8 | 4.8 | 4.8 | 4.7 | 4.7 | 4.6 | 4.6 | 4.5 | 4.5 | 4.5 | 4.4 | 4.4 | 4.3 | 4.3 | 4.3 | 4.2 | 4.2 | 4.1 | 4.1 | 4.1 | 4.0 | 4.0 | 3.9 | 3.9 | 3.8 | 3.8 | 3.8 | 3.7 | 3.7 | 3.6 |
| Level | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 4.8 | Bright |
| 2 | 4.8 | Bright |
| 3 | 4.8 | Bright |
| 4 | 4.7 | Bright |
| 5 | 4.7 | Bright |
| 6 | 4.6 | Bright |
| 7 | 4.6 | Bright |
| 8 | 4.5 | Bright |
| 9 | 4.5 | Bright |
| 10 | 4.5 | Bright |
| 11 | 4.4 | Bright |
| 12 | 4.4 | Bright |
| 13 | 4.3 | Bright |
| 14 | 4.3 | Bright |
| 15 | 4.3 | Bright |
| 16 | 4.2 | Bright |
| 17 | 4.2 | Bright |
| 18 | 4.1 | Bright |
| 19 | 4.1 | Bright |
| 20 | 4.1 | Bright |
| 21 | 4.0 | Bright |
| 22 | 4.0 | Moderate |
| 23 | 3.9 | Moderate |
| 24 | 3.9 | Moderate |
| 25 | 3.8 | Moderate |
| 26 | 3.8 | Moderate |
| 27 | 3.8 | Moderate |
| 28 | 3.7 | Moderate |
| 29 | 3.7 | Moderate |
| 30 | 3.6 | Moderate |
Hazard calendar for Flatlands
In September, Flatlands sits inside its atlantic hurricane season. The full year is below, with each hazard's peak months called out.
Flatlands sits in the Atlantic hurricane belt; the season peaks August–October.
Is September a good time to visit Flatlands?
Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
September is a reasonable time to visit Flatlands for sightseeing.
What to pack for Flatlands in September
From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In September, Flatlands sees daytime highs around 73°F and nights near 64°F. Worth packing: light clothes and rain gear. About 10 days see rain.
Sea temperature near Flatlands in September
The nearest coast averages about 71°F in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea offshore is warmest in August at about 74°F and coldest in February near 40°F.
It's comfortable for a long swim from Jun 30 to Sep 26 — about 2.9 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 | 41 | 46 | 55 | 65 | 72 | 74 | 71 | 63 | 55 | 48 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Cool | Refreshing | Refreshing | Refreshing | Cool | Bracing | Bracing |
| Sea temperature (°F) | Comfort | |
|---|---|---|
| Jan | 43 | Bracing |
| Feb | 40 | Bracing |
| Mar | 41 | Bracing |
| Apr | 46 | Bracing |
| May | 55 | Bracing |
| Jun | 65 | Cool |
| Jul | 72 | Refreshing |
| Aug | 74 | Refreshing |
| Sep | 71 | Refreshing |
| Oct | 63 | Cool |
| Nov | 55 | Bracing |
| Dec | 48 | Bracing |
UV index in Flatlands in September
Clear-sky midday UV in September peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Flatlands 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 Flatlands in September
Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.
Air quality in Flatlands is worst in July — around 18 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (November, 10 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) | 12 | 15 | 16 | 16 | 17 | 17 | 18 | 16 | 14 | 11 | 10 | 12 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 12 | Moderate |
| Feb | 15 | Moderate |
| Mar | 16 | Moderate |
| Apr | 16 | Moderate |
| May | 17 | Moderate |
| Jun | 17 | Moderate |
| Jul | 18 | Moderate |
| Aug | 16 | Moderate |
| Sep | 14 | Moderate |
| Oct | 11 | Good |
| Nov | 10 | Good |
| Dec | 12 | Good |
Where is Flatlands?
Flatlands sits at 40.6°N, 73.9°W, 16 ft above sea level, in United States. The nearest listed city is Sheepshead Bay, 1.9 mi away.
Topography around Flatlands
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Flatlands.
Within 2 miles, the terrain around Flatlands has only modest variations in elevation — a maximum elevation change of 89 ft around an average of 30 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 577 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,755 ft.
The land around Flatlands is covered by artificial surfaces (82%) within 2 miles, water (47%) and artificial surfaces (41%) within 10 miles, and trees (48%) and water (32%) 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 Flatlands (40.6212°, -73.9349°, elevation 16 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).