Live Weather & Forecast

Weather in Saint Charles

Illinois, United States · Real-time conditions & 3-day outlook

Flag of United States
Clear
18°C
Feels like 18°C
64°F / Feels 64°F
Clear
Saint Charles, Illinois
🌞 Daytime
Updated: 2026-04-12 06:45
💧
Humidity
70%
💨
Wind
14.4 km/h S
🌬️
Wind Gust
26.9 km/h
🌡️
Pressure
1018 mb
👁️
Visibility
16 km
☀️
UV Index
0 (Low)
🌧️
Precipitation
0 mm
☁️
Cloud Cover
0%
💦
Dew Point
12.2°C
🌐
Wind Degree
183°

Air Quality Index

US EPA: Good UK DEFRA: Low (1)
CO
192.9 μg/m³
NO₂
9.9 μg/m³
O₃
87 μg/m³
SO₂
3.4 μg/m³
PM 2.5
7.7 μg/m³
PM 10
8.2 μg/m³

Weather Alerts 2

Met · Severe · Immediate
Flood Warning issued April 11 at 11:35AM CDT by NWS St Louis MO

...The Flood Warning continues for the following river in Missouri and Illinois... Mississippi River at Clarksville. Mississippi River at Louisiana. River forecasts are based on observed precipitation and forecast precipitation for the next 24 hours. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Mississippi River at Clarksville. * WHEN...Until further notice....

Motorists should not attempt to drive around barricades or drive cars through flooded areas. This product, along with additional weather and stream information, is available at https://water.noaa.gov/wfo/lsx

Effective: 2026-04-11T11:35:00-05:00  ·  Expires: 2026-04-12T23:45:00-05:00
Met · Severe · Immediate
Flood Warning issued April 11 at 9:46PM CDT by NWS St Louis MO

...The Flood Warning continues for the following rivers in Missouri...Illinois... Mississippi River at Hannibal. Mississippi River at Clarksville. Mississippi River at Louisiana. River forecasts are based on observed precipitation and forecast precipitation for the next 24 hours. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Mississippi River at Clarksville....

Motorists should not attempt to drive around barricades or drive cars through flooded areas. This product, along with additional weather and stream information, is available at https://water.noaa.gov/wfo/lsx

Effective: 2026-04-11T21:46:00-05:00  ·  Expires: 2026-04-13T10:00:00-05:00

Today's Hourly Forecast

24-hour breakdown for Saint Charles, Illinois

12 AM
Clear
17°
Clear
💧 79% 💨 15.1 km/h
1 AM
Clear
17°
Clear
💧 80% 💨 15.8 km/h
2 AM
Clear
17°
Clear
💧 79% 💨 15.8 km/h
3 AM
Clear
17°
Clear
💧 77% 💨 14 km/h
4 AM
Clear
16°
Clear
💧 77% 💨 15.1 km/h
5 AM
Clear
16°
Clear
💧 80% 💨 15.1 km/h
6 AM
Clear
18°
Clear
💧 70% 💨 14.4 km/h
7 AM
Sunny
17°
Sunny
💧 78% 💨 15.8 km/h
8 AM
Sunny
19°
Sunny
💧 74% 💨 18.4 km/h
9 AM
Sunny
21°
Sunny
💧 66% 💨 21.6 km/h
10 AM
Sunny
24°
Sunny
💧 58% 💨 24.5 km/h
11 AM
Sunny
27°
Sunny
💧 50% 💨 25.6 km/h
12 PM
Sunny
28°
Sunny
💧 45% 💨 26.6 km/h
1 PM
Sunny
29°
Sunny
💧 43% 💨 28.4 km/h
2 PM
Sunny
29°
Sunny
💧 40% 💨 29.5 km/h
3 PM
Sunny
29°
Sunny
💧 35% 💨 27 km/h
4 PM
Sunny
28°
Sunny
💧 36% 💨 20.5 km/h
5 PM
Overcast
27°
Overcast
💧 42% 💨 23.8 km/h
6 PM
Overcast
25°
Overcast
💧 42% 💨 24.8 km/h
7 PM
Overcast
24°
Overcast
💧 50% 💨 26.3 km/h
8 PM
Overcast
24°
Overcast
💧 48% 💨 27.4 km/h
9 PM
Cloudy
23°
Cloudy
💧 49% 💨 27 km/h
10 PM
Overcast
22°
Overcast
💧 62% 💨 27 km/h
11 PM
Overcast
20°
Overcast
💧 52% 💨 27.4 km/h

3-Day Forecast

Daily overview for Saint Charles, Illinois

Today
Sunny
Sunny
30° / 16°
🌧️ 0% chance of rain
💧 Avg. humidity: 59%
💨 Max wind: 29.5 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 1.6
🌅 Sunrise: 06:29 AM
🌇 Sunset: 07:36 PM
🌙 Waning Crescent
🌑 Moon: 33% lit
Mon, Apr 13
Overcast
Overcast
29° / 17°
🌧️ 0% chance of rain
💧 Avg. humidity: 71%
💨 Max wind: 26.3 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 2
🌅 Sunrise: 06:28 AM
🌇 Sunset: 07:37 PM
🌙 Waning Crescent
🌑 Moon: 23% lit
Tue, Apr 14
Overcast
Overcast
27° / 21°
🌧️ 0% chance of rain
💧 Avg. humidity: 73%
💨 Max wind: 28.8 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 1.9
🌅 Sunrise: 06:26 AM
🌇 Sunset: 07:38 PM
🌙 Waning Crescent
🌑 Moon: 15% lit

Best Time to Visit Saint Charles

Plan your trip to Saint Charles, United States around the most favorable weather conditions.

Peak Season
June – September
Warm, dry summers — ideal for outdoor activities.
Shoulder Season
April – May, October
Fewer crowds, moderate prices, mild weather.
Off Season
November – March
Cooler temperatures; some regions may experience rain or snow.
← Back to Saint Charles 🗓 View Holidays 2026

Frequently Asked Questions

What is the current weather in Saint Charles?
Current conditions in Saint Charles: Clear, temperature 18°C, humidity 70%.
What is the best time to visit Saint Charles?
The best time to visit Saint Charles is typically June – September. Warm, dry summers — ideal for outdoor activities.
What is the climate like in Saint Charles?
Saint Charles is located at approximately 38.8° latitude. It has a temperate climate with warm summers and cold winters.
Does it rain a lot in Saint Charles?
The wettest period in Saint Charles is typically during November – March. Cooler temperatures; some regions may experience rain or snow.
What should I pack for a trip to Saint Charles?
For visits to Saint Charles during June – September: light clothing and sun protection. For November – March: layers and a waterproof jacket are recommended.
What country is Saint Charles in?
Saint Charles is located in United States, in the state of Illinois.
What are the public holidays in Saint Charles in 2026?
View the 2026 public holidays for Saint Charles on our Holidays page.
What are the GPS coordinates used for the weather forecast in Saint Charles?
The weather forecast for Saint Charles uses coordinates 38.7839, -90.4817.