Weather in Petersburg, IL
Updated 2026-09-26 10:15 local time · ZIP codes 62675
Overcast
No government weather alerts were returned for this location at the latest update.
Next hours
62°13% rain63°13% rain65°12% rain66°12% rain65°13% rain65°13% rain
65°9% rain67°11% rain66°13% rain
65°14% rain63°15% rain63°15% rain3-day weather forecast
Weather details
Sunrise, sunset and moon
Key weather changes ahead
Weather insights for today
Rain chance stays relatively low over the next 12 hours (up to 15%).
It feels like 57°F with winds near 7 mph.
67°F, 11% rain chance and 1 mph wind.
Visibility is around 6 mi; gusts may reach 9 mph.
Current temperature is 62°F, wind 7 mph, rain chance up to 15%.
UV index is 2.
Local weather characteristics in Petersburg
Illinois has four distinct seasons with hot, humid summers, cold winters, strong frontal changes and frequent spring and summer thunderstorms.
Petersburg is part of the Midwest weather region. The forecast point is near 40.01°N latitude and 89.85°W longitude. Local temperature, wind and precipitation can still differ from nearby places, especially where terrain, coastlines or urban development create small-scale weather changes.
Petersburg weather today
Overcast and 62°F in Petersburg, IL. Today's high is 67°F with a 12% rain chance. Winds are around 7 mph with gusts near 9 mph. Relative humidity is 56%, pressure is 30.18 inHg, and visibility is about 6 miles.
Tonight and tomorrow in Petersburg
Sunrise is at 06:50 AM and sunset is at 06:50 PM. Tomorrow's forecast calls for Sunny with a high near 76°F and a low near 56°F. The maximum rain chance is 36%.