Saint Charles weather in July
In July, Saint Charles sees average daytime highs of 87°F and overnight lows near 73°F, with 3.8 in of rain across 12 wet days and about 14.4 hours of daylight. It is the 1st-warmest and 3rd-wettest month of the year here.
Day-to-day highs hold fairly steady near 87°F through the month. The sky is clear or mostly clear about 30% of the time in July, and the air most often feels oppressive.
Daylight stretches from about 14 h 42 min at the start of July to 14 h 06 min by month's end. Set against the rest of the year, July is Saint Charles's 7th-clearest and 11th-windiest month. For the whole year in context, see Saint Charles's year-round climate.
- Daytime high
- 87°
- 1st warmest
- Overnight low
- 73°
- 12th coldest
- Rainfall
- 3.8 in
- 12 wet days
- Daylight
- 14 h 30 min
- 5:00 AM – 7:27 PM
- Cloud cover
- 58%
- 7th clearest
- Wind
- 5 mph
- 11th windiest
- Solar energy
- 6.02 kWh/m²
- Travel score
- 4.6
- out of 10
Saint Charles is census designated place in Charles County, Maryland, United States.
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in July
Day-to-day highs hold fairly steady near 87°F through the month.
A typical July day in Saint Charles reaches about 87°F in the afternoon and slips back to 73°F overnight — a 14°F spread between the day's warmth and the night's chill. On most days the high lands between 80°F and 94°F. Set against its neighbours, July runs about 4°F warmer than June and about 2°F warmer than 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) | 86 | 86 | 86 | 86 | 86 | 86 | 87 | 87 | 87 | 87 | 87 | 87 | 87 | 87 | 87 | 87 | 87 | 87 | 87 | 87 | 87 | 87 | 87 | 87 | 87 | 87 | 87 | 86 | 86 | 86 | 86 |
| Avg low (°F) | 72 | 72 | 72 | 72 | 72 | 72 | 73 | 73 | 73 | 73 | 73 | 73 | 73 | 73 | 73 | 73 | 73 | 73 | 73 | 73 | 73 | 73 | 73 | 73 | 73 | 73 | 73 | 73 | 73 | 73 | 73 |
| Avg high (°F) | Avg low (°F) | |
|---|---|---|
| 1 | 86 | 72 |
| 2 | 86 | 72 |
| 3 | 86 | 72 |
| 4 | 86 | 72 |
| 5 | 86 | 72 |
| 6 | 86 | 72 |
| 7 | 87 | 73 |
| 8 | 87 | 73 |
| 9 | 87 | 73 |
| 10 | 87 | 73 |
| 11 | 87 | 73 |
| 12 | 87 | 73 |
| 13 | 87 | 73 |
| 14 | 87 | 73 |
| 15 | 87 | 73 |
| 16 | 87 | 73 |
| 17 | 87 | 73 |
| 18 | 87 | 73 |
| 19 | 87 | 73 |
| 20 | 87 | 73 |
| 21 | 87 | 73 |
| 22 | 87 | 73 |
| 23 | 87 | 73 |
| 24 | 87 | 73 |
| 25 | 87 | 73 |
| 26 | 87 | 73 |
| 27 | 87 | 73 |
| 28 | 86 | 73 |
| 29 | 86 | 73 |
| 30 | 86 | 73 |
| 31 | 86 | 73 |
How July really feels in Saint Charles
Once humidity and wind are folded in, July averages 25 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.
The story in July is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Saint Charles weather by month
How July compares with the rest of the year at a glance. July is the 1st-warmest and 3rd-wettest month here — the current month is highlighted below.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 44° / 31° | 3.0 | 8.7 | 2.7 | 9.6 | 0.7 |
| Feb | 47° / 32° | 2.8 | 8.4 | 2.2 | 10.5 | 1.4 |
| Mar | 55° / 39° | 3.9 | 10.1 | 1.5 | 11.7 | 3.5 |
| Apr | 66° / 50° | 3.3 | 9.4 | 0 | 13 | 6.0 |
| May | 74° / 59° | 3.4 | 10.4 | 0 | 14.1 | 6.7 |
| Jun | 83° / 68° | 3.5 | 10.9 | 0 | 14.6 | 5.7 |
| Jul | 87° / 73° | 3.8 | 12 | 0 | 14.4 | 4.6 |
| Aug | 85° / 71° | 3.7 | 10.2 | 0 | 13.5 | 5.4 |
| Sep | 78° / 64° | 4.1 | 9.2 | 0 | 12.3 | 6.9 |
| Oct | 67° / 53° | 3.4 | 7.7 | 0 | 11 | 6.6 |
| Nov | 56° / 42° | 2.9 | 7.4 | 0.1 | 9.9 | 4.2 |
| Dec | 48° / 35° | 3.3 | 8.7 | 1.2 | 9.4 | 1.8 |
Cloud cover in July
The sky is clear or mostly clear about 30% of the time in July.
Beyond those clear spells, partly cloudy skies cover about 22% of July, with mostly cloudy or overcast conditions the remaining 48%.
| 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 (%) | 53 | 53 | 53 | 53 | 53 | 53 | 53 | 52 | 52 | 53 | 53 | 53 | 52 | 52 | 52 | 52 | 52 | 52 | 51 | 51 | 51 | 50 | 51 | 51 | 50 | 50 | 50 | 50 | 51 | 51 | 52 |
| Cloudier (%) | 47 | 47 | 47 | 47 | 47 | 47 | 47 | 48 | 48 | 47 | 47 | 47 | 48 | 48 | 48 | 48 | 48 | 48 | 49 | 49 | 49 | 50 | 49 | 49 | 50 | 50 | 50 | 50 | 49 | 49 | 48 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 53 | 47 |
| 2 | 53 | 47 |
| 3 | 53 | 47 |
| 4 | 53 | 47 |
| 5 | 53 | 47 |
| 6 | 53 | 47 |
| 7 | 53 | 47 |
| 8 | 52 | 48 |
| 9 | 52 | 48 |
| 10 | 53 | 47 |
| 11 | 53 | 47 |
| 12 | 53 | 47 |
| 13 | 52 | 48 |
| 14 | 52 | 48 |
| 15 | 52 | 48 |
| 16 | 52 | 48 |
| 17 | 52 | 48 |
| 18 | 52 | 48 |
| 19 | 51 | 49 |
| 20 | 51 | 49 |
| 21 | 51 | 49 |
| 22 | 50 | 50 |
| 23 | 51 | 49 |
| 24 | 51 | 49 |
| 25 | 50 | 50 |
| 26 | 50 | 50 |
| 27 | 50 | 50 |
| 28 | 50 | 50 |
| 29 | 51 | 49 |
| 30 | 51 | 49 |
| 31 | 52 | 48 |
Chance of precipitation in July
Saint Charles gets around 3.8 in of rain over 12 wet days in July. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 38% and peaks near 41% 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 (%) | 39 | 38 | 38 | 38 | 38 | 37 | 37 | 37 | 36 | 36 | 36 | 35 | 35 | 35 | 36 | 36 | 37 | 37 | 38 | 38 | 39 | 40 | 40 | 40 | 41 | 41 | 41 | 41 | 40 | 40 | 39 |
| Rain chance (%) | |
|---|---|
| 1 | 39 |
| 2 | 38 |
| 3 | 38 |
| 4 | 38 |
| 5 | 38 |
| 6 | 37 |
| 7 | 37 |
| 8 | 37 |
| 9 | 36 |
| 10 | 36 |
| 11 | 36 |
| 12 | 35 |
| 13 | 35 |
| 14 | 35 |
| 15 | 36 |
| 16 | 36 |
| 17 | 37 |
| 18 | 37 |
| 19 | 38 |
| 20 | 38 |
| 21 | 39 |
| 22 | 40 |
| 23 | 40 |
| 24 | 40 |
| 25 | 41 |
| 26 | 41 |
| 27 | 41 |
| 28 | 41 |
| 29 | 40 |
| 30 | 40 |
| 31 | 39 |
Humidity in July
Most of July feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, July lands in the oppressive band about 41% of days. Sticky, muggy-or-worse air turns up on roughly 76% 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 (%) | 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 | 1 | 1 | 1 | 1 | 1 |
| Comfortable (%) | 10 | 10 | 10 | 10 | 9 | 9 | 9 | 9 | 8 | 8 | 8 | 7 | 7 | 7 | 6 | 6 | 6 | 6 | 5 | 5 | 5 | 5 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
| Humid (%) | 20 | 19 | 19 | 18 | 18 | 18 | 18 | 17 | 17 | 17 | 17 | 17 | 17 | 16 | 16 | 16 | 16 | 15 | 15 | 15 | 15 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 15 | 15 |
| Muggy (%) | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 31 | 31 | 31 | 31 | 31 | 32 | 32 | 32 | 33 | 33 | 34 | 34 | 34 | 34 |
| Oppressive (%) | 34 | 35 | 36 | 36 | 37 | 37 | 38 | 38 | 39 | 39 | 40 | 40 | 41 | 41 | 41 | 42 | 42 | 43 | 44 | 44 | 45 | 45 | 46 | 46 | 46 | 46 | 45 | 45 | 44 | 43 | 43 |
| Miserable (%) | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 3 | 3 | 3 | 4 | 4 | 4 | 4 | 4 | 4 | 3 | 3 | 3 | 3 | 2 | 2 | 2 | 2 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|---|---|
| 1 | 3 | 10 | 20 | 32 | 34 | 1 |
| 2 | 3 | 10 | 19 | 32 | 35 | 1 |
| 3 | 3 | 10 | 19 | 32 | 36 | 1 |
| 4 | 3 | 10 | 18 | 32 | 36 | 1 |
| 5 | 2 | 9 | 18 | 32 | 37 | 1 |
| 6 | 2 | 9 | 18 | 32 | 37 | 2 |
| 7 | 2 | 9 | 18 | 32 | 38 | 2 |
| 8 | 2 | 9 | 17 | 32 | 38 | 2 |
| 9 | 2 | 8 | 17 | 32 | 39 | 2 |
| 10 | 2 | 8 | 17 | 32 | 39 | 2 |
| 11 | 1 | 8 | 17 | 32 | 40 | 2 |
| 12 | 1 | 7 | 17 | 32 | 40 | 3 |
| 13 | 1 | 7 | 17 | 32 | 41 | 3 |
| 14 | 1 | 7 | 16 | 32 | 41 | 3 |
| 15 | 1 | 6 | 16 | 32 | 41 | 3 |
| 16 | 1 | 6 | 16 | 32 | 42 | 3 |
| 17 | 1 | 6 | 16 | 32 | 42 | 3 |
| 18 | 1 | 6 | 15 | 31 | 43 | 4 |
| 19 | 1 | 5 | 15 | 31 | 44 | 4 |
| 20 | 1 | 5 | 15 | 31 | 44 | 4 |
| 21 | 1 | 5 | 15 | 31 | 45 | 4 |
| 22 | 1 | 5 | 14 | 31 | 45 | 4 |
| 23 | 1 | 4 | 14 | 32 | 46 | 4 |
| 24 | 1 | 4 | 14 | 32 | 46 | 3 |
| 25 | 1 | 4 | 14 | 32 | 46 | 3 |
| 26 | 1 | 4 | 14 | 33 | 46 | 3 |
| 27 | 1 | 4 | 14 | 33 | 45 | 3 |
| 28 | 1 | 4 | 14 | 34 | 45 | 2 |
| 29 | 1 | 4 | 14 | 34 | 44 | 2 |
| 30 | 1 | 4 | 15 | 34 | 43 | 2 |
| 31 | 1 | 4 | 15 | 34 | 43 | 2 |
Wind in July
Winds average 5 mph in July.
Across July, daily wind ranges from about 5 mph on the calmest days to 5 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) | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (mph) | Feels | |
|---|---|---|
| 1 | 5 | calm |
| 2 | 5 | calm |
| 3 | 5 | calm |
| 4 | 5 | calm |
| 5 | 5 | calm |
| 6 | 5 | calm |
| 7 | 5 | calm |
| 8 | 5 | calm |
| 9 | 5 | calm |
| 10 | 5 | calm |
| 11 | 5 | calm |
| 12 | 5 | calm |
| 13 | 5 | calm |
| 14 | 5 | calm |
| 15 | 5 | calm |
| 16 | 5 | calm |
| 17 | 5 | calm |
| 18 | 5 | calm |
| 19 | 5 | calm |
| 20 | 5 | calm |
| 21 | 5 | calm |
| 22 | 5 | calm |
| 23 | 5 | calm |
| 24 | 5 | calm |
| 25 | 5 | calm |
| 26 | 5 | calm |
| 27 | 5 | calm |
| 28 | 5 | calm |
| 29 | 5 | calm |
| 30 | 5 | calm |
| 31 | 5 | calm |
Sunrise & sunset in July
Daylight runs from about 14 h 42 min at the start of July to 14 h 06 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 36 minutes over July. Sunrise moves from 4:51 AM to 5:12 AM, and sunset from 7:31 PM to 7:16 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) | 14.7 | 14.7 | 14.6 | 14.6 | 14.6 | 14.6 | 14.6 | 14.6 | 14.6 | 14.6 | 14.5 | 14.5 | 14.5 | 14.5 | 14.5 | 14.5 | 14.4 | 14.4 | 14.4 | 14.4 | 14.3 | 14.3 | 14.3 | 14.3 | 14.2 | 14.2 | 14.2 | 14.2 | 14.1 | 14.1 | 14.1 |
| Sunrise (AM) | 4:51 | 4:52 | 4:52 | 4:52 | 4:53 | 4:54 | 4:54 | 4:55 | 4:55 | 4:56 | 4:56 | 4:57 | 4:58 | 4:58 | 4:59 | 5:00 | 5:01 | 5:01 | 5:02 | 5:03 | 5:04 | 5:04 | 5:05 | 5:06 | 5:07 | 5:08 | 5:09 | 5:09 | 5:10 | 5:11 | 5:12 |
| Sunset (PM) | 7:31 | 7:31 | 7:31 | 7:31 | 7:31 | 7:30 | 7:30 | 7:30 | 7:30 | 7:29 | 7:29 | 7:29 | 7:28 | 7:28 | 7:27 | 7:27 | 7:26 | 7:26 | 7:25 | 7:25 | 7:24 | 7:23 | 7:23 | 7:22 | 7:21 | 7:20 | 7:19 | 7:18 | 7:18 | 7:17 | 7:16 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 14.7 | 4:51 | 7:31 |
| 2 | 14.7 | 4:52 | 7:31 |
| 3 | 14.6 | 4:52 | 7:31 |
| 4 | 14.6 | 4:52 | 7:31 |
| 5 | 14.6 | 4:53 | 7:31 |
| 6 | 14.6 | 4:54 | 7:30 |
| 7 | 14.6 | 4:54 | 7:30 |
| 8 | 14.6 | 4:55 | 7:30 |
| 9 | 14.6 | 4:55 | 7:30 |
| 10 | 14.6 | 4:56 | 7:29 |
| 11 | 14.5 | 4:56 | 7:29 |
| 12 | 14.5 | 4:57 | 7:29 |
| 13 | 14.5 | 4:58 | 7:28 |
| 14 | 14.5 | 4:58 | 7:28 |
| 15 | 14.5 | 4:59 | 7:27 |
| 16 | 14.5 | 5:00 | 7:27 |
| 17 | 14.4 | 5:01 | 7:26 |
| 18 | 14.4 | 5:01 | 7:26 |
| 19 | 14.4 | 5:02 | 7:25 |
| 20 | 14.4 | 5:03 | 7:25 |
| 21 | 14.3 | 5:04 | 7:24 |
| 22 | 14.3 | 5:04 | 7:23 |
| 23 | 14.3 | 5:05 | 7:23 |
| 24 | 14.3 | 5:06 | 7:22 |
| 25 | 14.2 | 5:07 | 7:21 |
| 26 | 14.2 | 5:08 | 7:20 |
| 27 | 14.2 | 5:09 | 7:19 |
| 28 | 14.2 | 5:09 | 7:18 |
| 29 | 14.1 | 5:10 | 7:18 |
| 30 | 14.1 | 5:11 | 7:17 |
| 31 | 14.1 | 5:12 | 7:16 |
Solar energy in July
Average shortwave solar energy reaching the ground each day in July, about 6.02 kWh/m².
For context, solar energy here swings from a low near 2 kWh/m² to a high of 6.15 kWh/m² in June across the year — July's 6.02 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) | 6.3 | 6.3 | 6.3 | 6.3 | 6.3 | 6.3 | 6.3 | 6.2 | 6.2 | 6.2 | 6.2 | 6.2 | 6.2 | 6.2 | 6.1 | 6.1 | 6.1 | 6.0 | 6.0 | 6.0 | 5.9 | 5.9 | 5.9 | 5.8 | 5.8 | 5.8 | 5.7 | 5.7 | 5.7 | 5.7 | 5.7 |
| Level | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 6.3 | Intense |
| 2 | 6.3 | Intense |
| 3 | 6.3 | Intense |
| 4 | 6.3 | Intense |
| 5 | 6.3 | Intense |
| 6 | 6.3 | Intense |
| 7 | 6.3 | Intense |
| 8 | 6.2 | Intense |
| 9 | 6.2 | Intense |
| 10 | 6.2 | Intense |
| 11 | 6.2 | Intense |
| 12 | 6.2 | Intense |
| 13 | 6.2 | Intense |
| 14 | 6.2 | Intense |
| 15 | 6.1 | Intense |
| 16 | 6.1 | Intense |
| 17 | 6.1 | Intense |
| 18 | 6.0 | Intense |
| 19 | 6.0 | Intense |
| 20 | 6.0 | Bright |
| 21 | 5.9 | Bright |
| 22 | 5.9 | Bright |
| 23 | 5.9 | Bright |
| 24 | 5.8 | Bright |
| 25 | 5.8 | Bright |
| 26 | 5.8 | Bright |
| 27 | 5.7 | Bright |
| 28 | 5.7 | Bright |
| 29 | 5.7 | Bright |
| 30 | 5.7 | Bright |
| 31 | 5.7 | Bright |
Hazard calendar for Saint Charles
In July, Saint Charles sits inside its atlantic hurricane season. The full year is below, with each hazard's peak months called out.
Saint Charles sits in the Atlantic hurricane belt; the season peaks August–October.
Is July a good time to visit Saint Charles?
Our two travel scores rate July for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
July is a reasonable time to visit Saint Charles for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Saint Charles in July
From July's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In July, Saint Charles sees daytime highs around 87°F and nights near 73°F. Pack light clothes and sun protection. Worth having: rain gear. About 12 days see rain.
Sea temperature near Saint Charles in July
The nearest coast averages about 76°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 30 mi away) is warmest in August at about 78°F and coldest in February near 37°F.
It's comfortable for a long swim from Jun 16 to Oct 6 — about 3.7 months when the water holds above 68°F.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°F) | 38 | 37 | 40 | 47 | 57 | 68 | 76 | 78 | 74 | 65 | 54 | 45 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Refreshing | Warm | Warm | Refreshing | Cool | Bracing | Bracing |
| Sea temperature (°F) | Comfort | |
|---|---|---|
| Jan | 38 | Bracing |
| Feb | 37 | Bracing |
| Mar | 40 | Bracing |
| Apr | 47 | Bracing |
| May | 57 | Bracing |
| Jun | 68 | Refreshing |
| Jul | 76 | Warm |
| Aug | 78 | Warm |
| Sep | 74 | Refreshing |
| Oct | 65 | Cool |
| Nov | 54 | Bracing |
| Dec | 45 | Bracing |
UV index in Saint Charles in July
Clear-sky midday UV in July peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Saint Charles peaks around July 11 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 2 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 3 | 5 | 6 | 8 | 9 | 9 | 7 | 6 | 4 | 3 | 2 |
| Level | Moderate | Moderate | Moderate | High | Very high | Very high | Very high | High | High | Moderate | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Moderate |
| Feb | 3 | Moderate |
| Mar | 5 | Moderate |
| Apr | 6 | High |
| May | 8 | Very high |
| Jun | 9 | Very high |
| Jul | 9 | Very high |
| Aug | 7 | High |
| Sep | 6 | High |
| Oct | 4 | Moderate |
| Nov | 3 | Moderate |
| Dec | 2 | Low |
Air quality in Saint Charles 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 Saint Charles is worst in July — around 16 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (November, 7 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) | 9 | 10 | 12 | 13 | 14 | 15 | 16 | 14 | 11 | 8 | 7 | 8 |
| Level | Good | Good | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 9 | Good |
| Feb | 10 | Good |
| Mar | 12 | Good |
| Apr | 13 | Moderate |
| May | 14 | Moderate |
| Jun | 15 | Moderate |
| Jul | 16 | Moderate |
| Aug | 14 | Moderate |
| Sep | 11 | Good |
| Oct | 8 | Good |
| Nov | 7 | Good |
| Dec | 8 | Good |
Where is Saint Charles?
Saint Charles sits at 38.6°N, 76.9°W, 200 ft above sea level, in United States. The nearest listed city is St. Charles, 0.6 mi away.
Topography around Saint Charles
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Saint Charles.
Within 2 miles, the terrain around Saint Charles has only modest variations in elevation — a maximum elevation change of 98 ft around an average of 213 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 312 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,539 ft.
The land around Saint Charles is covered by trees (61%) and artificial surfaces (24%) within 2 miles, trees (77%) within 10 miles, and trees (60%) and water (20%) 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 Saint Charles (38.6032°, -76.9386°, elevation 200 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).