Yosemite National Park is definitely worth a visit
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Saint Charles Weather in September
September in Saint Charles sees daytime temperatures around 24°C (75°F) and lows of 12°C (54°F) at night. With around 94 mm (3.7 in) of rainfall expected, it's worth packing a rain jacket.
Rainfall in Saint Charles in September
Historically, September sees about 9 days of rain, with a monthly average of 94 mm (3.7 in). The rain this month tends to fall in heavier spells rather than light drizzle. When it rains, showers can be significant.
Temperature in Saint Charles in September
The temperature in Saint Charles in September is excellent. Daytime highs reach 24°C (75°F), with nights dropping to 12°C (54°F). The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. At 12°C (54°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping.
Sunshine in Saint Charles in September
The month enjoys around 226 hours of sunshine, creating mostly sunny days with good weather conditions.If you're a fan of comfortable temperatures and drier conditions, September is a great time to visit.
Saint Charles Temperature in September
Min Temperature
12°C (54°F)
Max Temperature
24°C (75°F)
Chance of Rain
30%
Precipitation
94 mm (3.7 in)
Rainy days
9 days
Humidity
71% *
Sunshine
226 hours *
Percentage Sunshine
60% *
* Data from: Chicago, the United States of America (34 KM, 21 Miles).
Saint Charles Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Saint Charles - and find the best time to visit.
Best Places in the United States of America in September
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in September →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Saint Charles in September
Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Prepare for significant rainfall with proper waterproof clothing and shoes. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.
What To Do in Saint Charles in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming9/10 -
Cycling9/10 -
Walking9/10 -
Barbeque8/10 -
Camping8/10 -
Outdoor sports9/10
Saint Charles 3-Day Forecast
More climate data for Saint Charles
Temperature Rainfall Sunshine Humidity
See the full Saint Charles climate overview or explore weather in the United States of America.
Popular in September
Where to go in September - average daytime high across popular destinations.
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Need travel inspiration? Check out our bucket list articles and be inspired.
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