Saint Charles Weather in August

Saint Charles in August averages 28°C (82°F) during the day and 17°C (63°F) at night. This is part of the summer season, and quite a bit of rainfall is expected this month.

Rainfall in Saint Charles in August

Based on our climate data of the past 30 years, about 11 days of rain are anticipated, with 109 mm (4.3 in) on average. When it rains this month, it tends to come down fairly heavily. Showers can be substantial even if they don't last all day.

Temperature in Saint Charles in August

Saint Charles in August gets highs of 28°C (82°F) during the day and drops to 17°C (63°F) at night. August marks the summer season. The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. With lows of 17°C (63°F), nights are cool. If you're out after dark, an extra layer will keep you comfortable. The cooler air at night is also great for getting a good rest.

Sunshine in Saint Charles in August

Enjoy a sunny month with about 280 hours of sunshine, the clear skies make Saint Charles even more beautiful.

Our weather planner can help you find worldwide destinations with pleasant weather during this period. September typically offers the best weather for Saint Charles.

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For a detailed overview over the year and the best time to visit the United States of America, check out our Saint Charles's climate page.

Saint Charles Temperature in August

Min Temperature 17°C (63°F)  

Max Temperature 28°C (82°F)  

Chance of Rain 36%  

Precipitation 109 mm (4.3 in)  

Rainy days 11 days  

Humidity 71% *  

Sunshine 280 hours *  

Percentage Sunshine 66% *  

* Data from: Chicago, the United States of America (34 KM, 21 Miles).

What to Wear in Saint Charles in August

Warm but pleasant conditions in Saint Charles in August. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. Expect heavy rainfall, so bring good rain protection and waterproof bags. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.

What To Do in Saint Charles in August

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

9/10

Cycling

7/10

Walking

7/10

Camping

6/10

Outdoor sports

7/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Saint Charles's climate page.

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.