Live Weather & Forecast

Weather in Petersburg

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

Flag of United States
Overcast
20°C
Feels like 20°C
68°F / Feels 68°F
Overcast
Petersburg, Illinois
🌞 Daytime
Updated: 2026-04-15 09:30
💧
Humidity
78%
💨
Wind
23.8 km/h SSW
🌬️
Wind Gust
34.9 km/h
🌡️
Pressure
1011 mb
👁️
Visibility
16 km
☀️
UV Index
0.8 (Low)
🌧️
Precipitation
0 mm
☁️
Cloud Cover
100%
💦
Dew Point
16.3°C
🌐
Wind Degree
205°

Air Quality Index

US EPA: Good UK DEFRA: Low (1)
CO
141.9 μg/m³
NO₂
2.4 μg/m³
O₃
80 μg/m³
SO₂
1.3 μg/m³
PM 2.5
6.8 μg/m³
PM 10
7.3 μg/m³

Weather Alerts 2

Met · Severe · Immediate
Flood Warning issued April 14 at 8:55PM CDT by NWS Lincoln IL

...The Flood Warning is extended for the following rivers in Illinois... Illinois River at Beardstown affecting Schuyler, Cass, Morgan and Brown Counties. ...The Flood Warning continues for the following rivers in Illinois... Illinois River near Havana affecting Fulton, Cass and Mason Counties. .The following forecasts are based on observed precipitation, soil moisture conditions, and forecast...

Persons with interests along this river need to remain aware of the latest forecasts and associated flood risk for their area. Stay tuned for further updates on this flooding situation. Caution is urged when walking near riverbanks. Additional information is available at www.weather.gov.

Met · Severe · Immediate
Flood Warning issued April 14 at 8:55PM CDT by NWS Lincoln IL

...The Flood Warning is extended for the following rivers in Illinois... Illinois River at Beardstown affecting Schuyler, Cass, Morgan and Brown Counties. ...The Flood Warning continues for the following rivers in Illinois... Illinois River near Havana affecting Fulton, Cass and Mason Counties. .The following forecasts are based on observed precipitation, soil moisture conditions, and forecast...

Persons with interests along this river need to remain aware of the latest forecasts and associated flood risk for their area. Stay tuned for further updates on this flooding situation. Caution is urged when walking near riverbanks. Additional information is available at www.weather.gov.

Today's Hourly Forecast

24-hour breakdown for Petersburg, Illinois

12 AM
Clear
24°
Clear
💧 64% 💨 32.8 km/h
1 AM
Clear
24°
Clear
💧 68% 💨 44.3 km/h
2 AM
Clear
23°
Clear
💧 70% 💨 23.4 km/h
3 AM
Clear
23°
Clear
💧 71% 💨 22.7 km/h
4 AM
Clear
23°
Clear
💧 71% 💨 22 km/h
5 AM
Clear
23°
Clear
💧 71% 💨 26.3 km/h
6 AM
Patchy rain nearby
22°
Patchy rain nearby
💧 74% 💨 26.6 km/h 🌧️ 60%
7 AM
Patchy light drizzle
22°
Patchy light drizzle
💧 78% 💨 18.7 km/h 🌧️ 100%
8 AM
Patchy rain nearby
23°
Patchy rain nearby
💧 75% 💨 21.6 km/h 🌧️ 74%
9 AM
Overcast
20°
Overcast
💧 78% 💨 23.8 km/h
10 AM
Overcast
23°
Overcast
💧 53% 💨 23 km/h
11 AM
Light rain
22°
Light rain
💧 86% 💨 25.6 km/h 🌧️ 100%
12 PM
Light rain
23°
Light rain
💧 83% 💨 25.9 km/h 🌧️ 100%
1 PM
Patchy rain nearby
25°
Patchy rain nearby
💧 78% 💨 24.8 km/h 🌧️ 87%
2 PM
Sunny
27°
Sunny
💧 72% 💨 24.5 km/h
3 PM
Sunny
28°
Sunny
💧 64% 💨 21.6 km/h
4 PM
Sunny
27°
Sunny
💧 57% 💨 22.7 km/h
5 PM
Patchy rain nearby
26°
Patchy rain nearby
💧 61% 💨 23 km/h 🌧️ 100%
6 PM
Thundery outbreaks in nearby
23°
Thundery outbreaks in nearby
💧 70% 💨 25.9 km/h
7 PM
Overcast
23°
Overcast
💧 80% 💨 20.9 km/h
8 PM
Thundery outbreaks in nearby
23°
Thundery outbreaks in nearby
💧 78% 💨 25.9 km/h
9 PM
Clear
21°
Clear
💧 83% 💨 28.8 km/h
10 PM
Overcast
21°
Overcast
💧 91% 💨 26.6 km/h
11 PM
Partly Cloudy
20°
Partly Cloudy
💧 88% 💨 23.8 km/h

3-Day Forecast

Daily overview for Petersburg, Illinois

Today
Patchy rain nearby
Patchy rain nearby
29° / 19°
🌧️ 87% chance of rain
💧 Avg. humidity: 73%
💨 Max wind: 44.3 km/h
🌧️ Total precip: 3.44 mm
☀️ UV Index: 1
🌅 Sunrise: 06:21 AM
🌇 Sunset: 07:38 PM
🌙 Waning Crescent
🌑 Moon: 8% lit
Thu, Apr 16
Moderate rain
Moderate rain
26° / 13°
🌧️ 87% chance of rain
💧 Avg. humidity: 69%
💨 Max wind: 30.6 km/h
🌧️ Total precip: 8.37 mm
☀️ UV Index: 1.8
🌅 Sunrise: 06:20 AM
🌇 Sunset: 07:39 PM
🌙 Waning Crescent
🌑 Moon: 3% lit
Fri, Apr 17
Cloudy
Cloudy
28° / 15°
🌧️ 0% chance of rain
💧 Avg. humidity: 78%
💨 Max wind: 37.8 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 1.9
🌅 Sunrise: 06:18 AM
🌇 Sunset: 07:40 PM
🌙 New Moon
🌑 Moon: 0% lit

Best Time to Visit Petersburg

Plan your trip to Petersburg, 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 Petersburg 🗓 View Holidays 2026

Frequently Asked Questions

What is the current weather in Petersburg?
Current conditions in Petersburg: Overcast, temperature 20°C, humidity 78%.
What is the best time to visit Petersburg?
The best time to visit Petersburg is typically June – September. Warm, dry summers — ideal for outdoor activities.
What is the climate like in Petersburg?
Petersburg is located at approximately 40° latitude. It has a temperate climate with warm summers and cold winters.
Does it rain a lot in Petersburg?
The wettest period in Petersburg is typically during November – March. Cooler temperatures; some regions may experience rain or snow.
What should I pack for a trip to Petersburg?
For visits to Petersburg during June – September: light clothing and sun protection. For November – March: layers and a waterproof jacket are recommended.
What country is Petersburg in?
Petersburg is located in United States, in the state of Illinois.
What are the public holidays in Petersburg in 2026?
View the 2026 public holidays for Petersburg on our Holidays page.
What are the GPS coordinates used for the weather forecast in Petersburg?
The weather forecast for Petersburg uses coordinates 40.0117, -89.8482.