Chicago UV index in September
Typical ultraviolet levels for Chicago during September, from the past year of data.
High
Chicago
High UV. Avoid the sun during peak hours and wear protective clothing, sunscreen, and a hat.
6.6
UV Index
September average
Low
Moderate
High
Very High
Extreme
September UV
6.625
Risk level
High
Yearly peak
9.2667
Peak month
July
Chicago UV index — monthly trend
Average UV index by month over the past year, with September highlighted.
Visiting Chicago in September?
In September, Chicago's typical UV index is about 6.625 — a high risk level. High UV. Avoid the sun during peak hours and wear protective clothing, sunscreen, and a hat.
Across the year, Chicago sees the strongest UV in Summer, peaking around 9.2667 in July. Plan sun protection accordingly.
