Honolulu UV index in September
Typical ultraviolet levels for Honolulu during September, from the past year of data.
Extreme
Honolulu
Extreme UV. Avoid sun exposure, seek shade, and use comprehensive protection: clothing, sunscreen, and a hat.
12.5
UV Index
September average UTC
Low
Moderate
High
Very High
Extreme
September UV
12.5386
Risk level
Extreme
Yearly peak
13.5602
Peak month
June
Honolulu UV index — monthly trend
Average UV index by month over the past year, with September highlighted.
Visiting Honolulu in September?
In September, Honolulu's typical UV index is about 12.5386 — a extreme risk level. Extreme UV. Avoid sun exposure, seek shade, and use comprehensive protection: clothing, sunscreen, and a hat.
Across the year, Honolulu sees the strongest UV in Summer, peaking around 13.5602 in June. Plan sun protection accordingly.
