Weather in Castleton, IL
Updated 2026-09-26 10:00 local time · ZIP codes 61426
Overcast
No government weather alerts were returned for this location at the latest update.
Next hours
57°16% rain60°14% rain61°14% rain62°14% rain62°15% rain64°13% rain
65°8% rain65°12% rain65°15% rain
63°14% rain61°17% rain60°16% 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 17%).
It feels like 51°F with winds near 9 mph.
65°F, 8% rain chance and 6 mph wind.
Visibility is around 6 mi; gusts may reach 13 mph.
Current temperature is 57°F, wind 9 mph, rain chance up to 17%.
UV index is 2.
Local weather characteristics in Castleton
Illinois has four distinct seasons with hot, humid summers, cold winters, strong frontal changes and frequent spring and summer thunderstorms.
Castleton is part of the Midwest weather region. The forecast point is near 41.12°N latitude and 89.71°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.
Castleton weather today
Overcast and 57°F in Castleton, IL. Today's high is 65°F with a 15% rain chance. Winds are around 9 mph with gusts near 13 mph. Relative humidity is 65%, pressure is 30.19 inHg, and visibility is about 6 miles.
Tonight and tomorrow in Castleton
Sunrise is at 06:50 AM and sunset is at 06:49 PM. Tomorrow's forecast calls for Sunny with a high near 70°F and a low near 55°F. The maximum rain chance is 7%.