St. Louis UV index in September
Typical ultraviolet levels for St. Louis during September, from the past year of data.
High
St. Louis
High UV. Avoid the sun during peak hours and wear protective clothing, sunscreen, and a hat.
7.5
UV Index
September average UTC
Low
Moderate
High
Very High
Extreme
September UV
7.5023
Risk level
High
Yearly peak
10.0513
Peak month
July
St. Louis UV index — monthly trend
Average UV index by month over the past year, with September highlighted.
Visiting St. Louis in September?
In September, St. Louis's typical UV index is about 7.5023 — a high risk level. High UV. Avoid the sun during peak hours and wear protective clothing, sunscreen, and a hat.
Across the year, St. Louis sees the strongest UV in Summer, peaking around 10.0513 in July. Plan sun protection accordingly.
