SIU Weather

Weather and Climate at SIU

Southern Illinois University, located in Carbondale, experiences a humid subtropical climate. The region has hot, humid summers with temperatures often reaching into the 90s°F (32°C) and cool winters with temperatures occasionally dropping below freezing.

• Summer: Average high temperatures range from 85°F to 90°F (29°C to 32°C), with high humidity levels.
• Winter: Average low temperatures can drop to 20°F (-7°C), with occasional snow.
• Spring and Fall: These seasons are mild, with temperatures ranging from 50°F to 70°F (10°C to 21°C).
• Rainfall: The area receives about 40-50 inches of rain annually, with thunderstorms common in summer.
• Extreme Weather: The region is susceptible to severe weather, including thunderstorms and tornadoes.

The weather at SIU can impact commuting due to occasional heavy rain or snow, and campus life often adapts to the seasonal changes, with outdoor activities more prevalent in the warmer months. Outdoor research may be affected by extreme weather conditions, requiring adjustments in scheduling and safety measures.