San Diego UV index in September
Typical ultraviolet levels for San Diego during September, from the past year of data.
Very High
San Diego
Very high UV. Limit sun exposure, especially during midday; protective clothing, sunscreen, and a hat are essential.
8.5
UV Index
September average UTC
Low
Moderate
High
Very High
Extreme
September UV
8.5134
Risk level
Very High
Yearly peak
10.5463
Peak month
July
San Diego UV index — monthly trend
Average UV index by month over the past year, with September highlighted.
Visiting San Diego in September?
In September, San Diego's typical UV index is about 8.5134 — a very high risk level. Very high UV. Limit sun exposure, especially during midday; protective clothing, sunscreen, and a hat are essential.
Across the year, San Diego sees the strongest UV in Summer, peaking around 10.5463 in July. Plan sun protection accordingly.
