Seattle UV index in September
Typical ultraviolet levels for Seattle during September, from the past year of data.
High
Seattle
High UV. Avoid the sun during peak hours and wear protective clothing, sunscreen, and a hat.
6.2
UV Index
September average
Low
Moderate
High
Very High
Extreme
September UV
6.1503
Risk level
High
Yearly peak
9.4524
Peak month
July
Seattle UV index — monthly trend
Average UV index by month over the past year, with September highlighted.
Visiting Seattle in September?
In September, Seattle's typical UV index is about 6.1503 — a high risk level. High UV. Avoid the sun during peak hours and wear protective clothing, sunscreen, and a hat.
Across the year, Seattle sees the strongest UV in Summer, peaking around 9.4524 in July. Plan sun protection accordingly.
