Live Weather & Forecast
Weather in Collinsville
Illinois, United States · Real-time conditions & 3-day outlook
20°C
Feels like 20°C
68°F / Feels 68°F
Moderate or heavy rain with thunder
Collinsville, Illinois
🌙 Nighttime
Updated: 2026-04-15 22:30
Humidity
94%
Wind
20.5 km/h SSW
Wind Gust
35.2 km/h
Pressure
1010 mb
Visibility
16 km
UV Index
0
(Low)
Precipitation
0 mm
Cloud Cover
100%
Dew Point
17.8°C
Wind Degree
213°
Air Quality Index
US EPA: Good
UK DEFRA: Low (1)
CO
160.9 μg/m³
NO₂
5.8 μg/m³
O₃
70 μg/m³
SO₂
2.2 μg/m³
PM 2.5
4.8 μg/m³
PM 10
4.9 μg/m³
Today's Hourly Forecast
24-hour breakdown for Collinsville, Illinois
12 AM
23°
Clear
1 AM
22°
Clear
2 AM
22°
Clear
3 AM
22°
Clear
4 AM
22°
Clear
5 AM
22°
Clear
6 AM
22°
Patchy rain nearby
7 AM
22°
Sunny
8 AM
23°
Sunny
9 AM
24°
Sunny
10 AM
24°
Patchy rain nearby
11 AM
24°
Moderate rain at times
12 PM
24°
Patchy rain nearby
1 PM
25°
Sunny
2 PM
25°
Patchy rain nearby
3 PM
27°
Patchy rain nearby
4 PM
27°
Patchy rain nearby
5 PM
28°
Patchy rain nearby
6 PM
26°
Sunny
7 PM
23°
Sunny
8 PM
22°
Clear
9 PM
21°
Clear
10 PM
20°
Moderate or heavy rain with thunder
11 PM
18°
Light drizzle
3-Day Forecast
Daily overview for Collinsville, Illinois
Today
Patchy rain nearby
28°
/
18°
🌧️ 89% chance of rain
💧 Avg. humidity: 73%
💨 Max wind: 28.1 km/h
🌧️ Total precip: 1.23 mm
☀️ UV Index: 1.1
🌅 Sunrise: 06:23 AM
🌇 Sunset: 07:37 PM
🌙 Waning Crescent
🌑 Moon: 8% lit
Thu, Apr 16
Moderate rain
30°
/
15°
🌧️ 85% chance of rain
💧 Avg. humidity: 70%
💨 Max wind: 24.1 km/h
🌧️ Total precip: 11.25 mm
☀️ UV Index: 1.8
🌅 Sunrise: 06:22 AM
🌇 Sunset: 07:38 PM
🌙 Waning Crescent
🌑 Moon: 3% lit
Fri, Apr 17
Overcast
30°
/
16°
🌧️ 0% chance of rain
💧 Avg. humidity: 78%
💨 Max wind: 36 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 1.9
🌅 Sunrise: 06:21 AM
🌇 Sunset: 07:39 PM
🌙 New Moon
🌑 Moon: 0% lit
Best Time to Visit Collinsville
Plan your trip to Collinsville, 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.
Frequently Asked Questions
What is the current weather in Collinsville?
Current conditions in Collinsville: Moderate or heavy rain with thunder, temperature 20°C, humidity 94%.
What is the best time to visit Collinsville?
The best time to visit Collinsville is typically June – September. Warm, dry summers — ideal for outdoor activities.
What is the climate like in Collinsville?
Collinsville is located at approximately 38.7° latitude. It has a temperate climate with warm summers and cold winters.
Does it rain a lot in Collinsville?
The wettest period in Collinsville is typically during November – March. Cooler temperatures; some regions may experience rain or snow.
What should I pack for a trip to Collinsville?
For visits to Collinsville during June – September: light clothing and sun protection. For November – March: layers and a waterproof jacket are recommended.
What country is Collinsville in?
Collinsville is located in United States, in the state of Illinois.
What are the public holidays in Collinsville in 2026?
View the 2026 public holidays for Collinsville on our Holidays page.
What are the GPS coordinates used for the weather forecast in Collinsville?
The weather forecast for Collinsville uses coordinates 38.6703, -89.9845.