Live Weather & Forecast
Weather in Vandalia
Illinois, United States · Real-time conditions & 3-day outlook
24°C
Feels like 26°C
75°F / Feels 78°F
Partly cloudy
Vandalia, Illinois
🌞 Daytime
Updated: 2026-04-13 09:00
Humidity
67%
Wind
23 km/h SSW
Wind Gust
31.2 km/h
Pressure
1017 mb
Visibility
16 km
UV Index
2
(Low)
Precipitation
0 mm
Cloud Cover
75%
Dew Point
17.6°C
Wind Degree
203°
Air Quality Index
US EPA: Good
UK DEFRA: Low (1)
CO
138.9 μg/m³
NO₂
1.7 μg/m³
O₃
90 μg/m³
SO₂
1.5 μg/m³
PM 2.5
4.5 μg/m³
PM 10
5.2 μg/m³
Today's Hourly Forecast
24-hour breakdown for Vandalia, Illinois
12 AM
20°
Clear
1 AM
20°
Clear
2 AM
20°
Clear
3 AM
20°
Clear
4 AM
20°
Overcast
5 AM
20°
Clear
6 AM
20°
Clear
7 AM
20°
Overcast
8 AM
21°
Overcast
9 AM
24°
Partly cloudy
10 AM
23°
Overcast
11 AM
24°
Cloudy
12 PM
25°
Overcast
1 PM
26°
Cloudy
2 PM
28°
Partly Cloudy
3 PM
29°
Sunny
4 PM
28°
Sunny
5 PM
26°
Sunny
6 PM
25°
Thundery outbreaks in nearby
7 PM
24°
Thundery outbreaks in nearby
8 PM
23°
Thundery outbreaks in nearby
9 PM
22°
Thundery outbreaks in nearby
10 PM
22°
Cloudy
11 PM
22°
Thundery outbreaks in nearby
3-Day Forecast
Daily overview for Vandalia, Illinois
Today
Cloudy
30°
/
19°
🌧️ 0% chance of rain
💧 Avg. humidity: 71%
💨 Max wind: 30.6 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 1.6
🌅 Sunrise: 06:22 AM
🌇 Sunset: 07:32 PM
🌙 Waning Crescent
🌑 Moon: 23% lit
Tue, Apr 14
Thundery outbreaks in nearby
24°
/
19°
🌧️ 0% chance of rain
💧 Avg. humidity: 80%
💨 Max wind: 33.1 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 2
🌅 Sunrise: 06:21 AM
🌇 Sunset: 07:33 PM
🌙 Waning Crescent
🌑 Moon: 15% lit
Wed, Apr 15
Moderate rain
23°
/
19°
🌧️ 84% chance of rain
💧 Avg. humidity: 84%
💨 Max wind: 29.5 km/h
🌧️ Total precip: 8.8 mm
☀️ UV Index: 1.2
🌅 Sunrise: 06:19 AM
🌇 Sunset: 07:34 PM
🌙 Waning Crescent
🌑 Moon: 8% lit
Best Time to Visit Vandalia
Plan your trip to Vandalia, 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 Vandalia?
Current conditions in Vandalia: Partly cloudy, temperature 24°C, humidity 67%.
What is the best time to visit Vandalia?
The best time to visit Vandalia is typically June – September. Warm, dry summers — ideal for outdoor activities.
What is the climate like in Vandalia?
Vandalia is located at approximately 39° latitude. It has a temperate climate with warm summers and cold winters.
Does it rain a lot in Vandalia?
The wettest period in Vandalia is typically during November – March. Cooler temperatures; some regions may experience rain or snow.
What should I pack for a trip to Vandalia?
For visits to Vandalia during June – September: light clothing and sun protection. For November – March: layers and a waterproof jacket are recommended.
What country is Vandalia in?
Vandalia is located in United States, in the state of Illinois.
What are the public holidays in Vandalia in 2026?
View the 2026 public holidays for Vandalia on our Holidays page.
What are the GPS coordinates used for the weather forecast in Vandalia?
The weather forecast for Vandalia uses coordinates 38.9606, -89.0937.