Average temperatures, rainfall and packing tips for Chicago, United States in September
🌡️ Avg high
25°C
🌙 Avg low
16°C
🌧️ Rainfall
~68 mm
📊 Warmth rank
#4 of 12
September in Chicago at a glance
September in Chicago is typically warm, with average daytime highs around 25°C and nights near 16°C. Temperature-wise it sits mid-range for Chicago (the 4th warmest month).
Expect some rain: around 68 mm falls in Chicago during September on average.
What to pack for Chicago in September
T-shirts and light layers
A light jacket or sweater for the evenings
A compact umbrella for occasional showers
Chicago - year at a glance
HighLow · September highlighted
Is September a good time to visit Chicago?
🧳 September is one of the most comfortable months to visit Chicago - daytime temperatures sit in a pleasant range and it's a good pick for sightseeing and time outdoors.
In September, Chicago averages a daytime high of about 25°C and a night-time low of around 16°C, based on recent historical data.
Does it rain in Chicago in September?
Expect some rain: around 68 mm falls in Chicago during September on average.
Is September a good time to visit Chicago?
September is one of the most comfortable months to visit Chicago - daytime temperatures sit in a pleasant range and it's a good pick for sightseeing and time outdoors.