Live Weather & Forecast
Weather in Harrisburg
Illinois, United States · Real-time conditions & 3-day outlook
26°C
Feels like 26°C
80°F / Feels 79°F
Sunny
Harrisburg, Illinois
🌞 Daytime
Updated: 2026-04-12 16:30
Humidity
33%
Wind
25.6 km/h SSW
Wind Gust
34.8 km/h
Pressure
1018 mb
Visibility
16 km
UV Index
2.8
(Low)
Precipitation
0 mm
Cloud Cover
0%
Dew Point
11.4°C
Wind Degree
194°
Air Quality Index
US EPA: Good
UK DEFRA: Low (1)
CO
147.9 μg/m³
NO₂
3 μg/m³
O₃
113 μg/m³
SO₂
2 μg/m³
PM 2.5
5.1 μg/m³
PM 10
5.4 μg/m³
Weather Alerts 1
Met
· Moderate · Expected
Special Weather Statement issued April 12 at 12:21AM CDT by NWS Paducah KY
Elevated conditions for wildfires are expected this afternoon, mainly between 12 PM and 7 PM CDT. Relative humidity values will fall to 25 to 35% this afternoon, and winds will be breezy from the south, sustained at 10 to 15 mph with gusts of 25 to 30 mph forecast. Vegetation is dry due to ongoing moderate to severe drought conditions over much of the region. Outdoor burning and activities that i...
Today's Hourly Forecast
24-hour breakdown for Harrisburg, Illinois
12 AM
16°
Clear
1 AM
16°
Clear
2 AM
15°
Clear
3 AM
15°
Clear
4 AM
15°
Clear
5 AM
15°
Clear
6 AM
15°
Clear
7 AM
16°
Sunny
8 AM
18°
Sunny
9 AM
20°
Sunny
10 AM
22°
Sunny
11 AM
24°
Sunny
12 PM
26°
Sunny
1 PM
27°
Sunny
2 PM
28°
Sunny
3 PM
27°
Sunny
4 PM
26°
Sunny
5 PM
27°
Sunny
6 PM
26°
Sunny
7 PM
25°
Sunny
8 PM
24°
Clear
9 PM
23°
Clear
10 PM
22°
Clear
11 PM
21°
Patchy rain nearby
3-Day Forecast
Daily overview for Harrisburg, Illinois
Today
Sunny
28°
/
14°
🌧️ 0% chance of rain
💧 Avg. humidity: 60%
💨 Max wind: 32.8 km/h
🌧️ Total precip: 0.04 mm
☀️ UV Index: 1.8
🌅 Sunrise: 06:23 AM
🌇 Sunset: 07:28 PM
🌙 Waning Crescent
🌑 Moon: 33% lit
Mon, Apr 13
Patchy rain nearby
27°
/
18°
🌧️ 69% chance of rain
💧 Avg. humidity: 73%
💨 Max wind: 28.8 km/h
🌧️ Total precip: 3.03 mm
☀️ UV Index: 1.3
🌅 Sunrise: 06:22 AM
🌇 Sunset: 07:28 PM
🌙 Waning Crescent
🌑 Moon: 23% lit
Tue, Apr 14
Partly Cloudy
29°
/
19°
🌧️ 0% chance of rain
💧 Avg. humidity: 72%
💨 Max wind: 33.1 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 2.1
🌅 Sunrise: 06:20 AM
🌇 Sunset: 07:29 PM
🌙 Waning Crescent
🌑 Moon: 15% lit
Best Time to Visit Harrisburg
Plan your trip to Harrisburg, 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 Harrisburg?
Current conditions in Harrisburg: Sunny, temperature 26°C, humidity 33%.
What is the best time to visit Harrisburg?
The best time to visit Harrisburg is typically June – September. Warm, dry summers — ideal for outdoor activities.
What is the climate like in Harrisburg?
Harrisburg is located at approximately 37.7° latitude. It has a temperate climate with warm summers and cold winters.
Does it rain a lot in Harrisburg?
The wettest period in Harrisburg is typically during November – March. Cooler temperatures; some regions may experience rain or snow.
What should I pack for a trip to Harrisburg?
For visits to Harrisburg during June – September: light clothing and sun protection. For November – March: layers and a waterproof jacket are recommended.
What country is Harrisburg in?
Harrisburg is located in United States, in the state of Illinois.
What are the public holidays in Harrisburg in 2026?
View the 2026 public holidays for Harrisburg on our Holidays page.
What are the GPS coordinates used for the weather forecast in Harrisburg?
The weather forecast for Harrisburg uses coordinates 37.7385, -88.5405.