Live Weather & Forecast

Weather in Petersburg

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

Flag of United States
Overcast
23°C
Feels like 25°C
74°F / Feels 77°F
Overcast
Petersburg, Illinois
🌞 Daytime
Updated: 2026-04-15 17:30
💧
Humidity
64%
💨
Wind
29.5 km/h SSW
🌬️
Wind Gust
40.1 km/h
🌡️
Pressure
1010 mb
👁️
Visibility
16 km
☀️
UV Index
1.3 (Low)
🌧️
Precipitation
0 mm
☁️
Cloud Cover
25%
💦
Dew Point
15.9°C
🌐
Wind Degree
206°

Air Quality Index

US EPA: Good UK DEFRA: Low (1)
CO
145.9 μg/m³
NO₂
3.2 μg/m³
O₃
74 μg/m³
SO₂
1.3 μg/m³
PM 2.5
4.6 μg/m³
PM 10
5.5 μg/m³

Weather Alerts 4

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.

Effective: 2026-04-14T20:55:00-05:00  ·  Expires: 2026-04-15T13:00:00-05:00
Met · Severe · Immediate
Flood Warning issued April 15 at 10:51AM CDT by NWS Lincoln IL

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

Caution is urged when walking near riverbanks. 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. Additional information is available at www.weather.gov.

Effective: 2026-04-15T10:51:00-05:00  ·  Expires: 2026-04-16T03:00:00-05:00
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.

Effective: 2026-04-14T20:55:00-05:00  ·  Expires: 2026-04-15T13:00:00-05:00
Met · Severe · Immediate
Flood Warning issued April 15 at 10:51AM CDT by NWS Lincoln IL

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

Caution is urged when walking near riverbanks. 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. Additional information is available at www.weather.gov.

Effective: 2026-04-15T10:51:00-05:00  ·  Expires: 2026-04-16T03:00:00-05:00

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% 💨 25.9 km/h
5 AM
Clear
23°
Clear
💧 71% 💨 21.6 km/h
6 AM
Patchy rain nearby
22°
Patchy rain nearby
💧 74% 💨 24.5 km/h 🌧️ 75%
7 AM
Patchy rain nearby
21°
Patchy rain nearby
💧 71% 💨 18 km/h 🌧️ 100%
8 AM
Light drizzle
21°
Light drizzle
💧 80% 💨 22.7 km/h 🌧️ 100%
9 AM
Light drizzle
22°
Light drizzle
💧 83% 💨 20.5 km/h 🌧️ 100%
10 AM
Patchy rain nearby
23°
Patchy rain nearby
💧 81% 💨 22.3 km/h 🌧️ 64%
11 AM
Patchy rain nearby
24°
Patchy rain nearby
💧 70% 💨 24.5 km/h 🌧️ 64%
12 PM
Partly Cloudy
24°
Partly Cloudy
💧 63% 💨 23 km/h
1 PM
Sunny
26°
Sunny
💧 70% 💨 24.1 km/h
2 PM
Sunny
27°
Sunny
💧 57% 💨 25.9 km/h
3 PM
Sunny
27°
Sunny
💧 47% 💨 27.7 km/h
4 PM
Partly Cloudy
27°
Partly Cloudy
💧 50% 💨 27 km/h
5 PM
Overcast
23°
Overcast
💧 64% 💨 29.5 km/h
6 PM
Heavy rain
23°
Heavy rain
💧 89% 💨 25.2 km/h 🌧️ 100%
7 PM
Patchy rain nearby
22°
Patchy rain nearby
💧 88% 💨 27 km/h 🌧️ 100%
8 PM
Clear
21°
Clear
💧 86% 💨 23.8 km/h
9 PM
Clear
19°
Clear
💧 84% 💨 29.9 km/h
10 PM
Patchy light rain
18°
Patchy light rain
💧 86% 💨 33.1 km/h 🌧️ 100%
11 PM
Patchy rain nearby
17°
Patchy rain nearby
💧 89% 💨 32 km/h 🌧️ 100%

3-Day Forecast

Daily overview for Petersburg, Illinois

Today
Heavy rain
Heavy rain
29° / 16°
🌧️ 87% chance of rain
💧 Avg. humidity: 72%
💨 Max wind: 44.3 km/h
🌧️ Total precip: 22.7 mm
☀️ UV Index: 1.1
🌅 Sunrise: 06:21 AM
🌇 Sunset: 07:38 PM
🌙 Waning Crescent
🌑 Moon: 8% lit
Thu, Apr 16
Patchy rain nearby
Patchy rain nearby
28° / 15°
🌧️ 84% chance of rain
💧 Avg. humidity: 66%
💨 Max wind: 30.2 km/h
🌧️ Total precip: 1.69 mm
☀️ UV Index: 1.8
🌅 Sunrise: 06:20 AM
🌇 Sunset: 07:39 PM
🌙 Waning Crescent
🌑 Moon: 3% lit
Fri, Apr 17
Overcast
Overcast
30° / 14°
🌧️ 0% chance of rain
💧 Avg. humidity: 75%
💨 Max wind: 41 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 1.7
🌅 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 23°C, humidity 64%.
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.