Average Sunshine in Hawaii for September

Number of Sunny Days

In the table below, the average number of Sunny Days for a city in Hawaii is the total days this month when the sky is mostly clear. This includes the days when cloud covers up to 30% of the sky during daylight hours.

Partly Sunny Days have cloud covering from 40% to 70% of the sky during the daytime.

Total Days With Sun is a sum of the Sunny plus Partly Sunny days. The rest of the days are mainly overcast, with at least 80% cloud cover. All the numbers are annual averages, made from years of weather watching.

Days of sunshine in September
City Sunny
Partly Sunny
Total Days
With Sun
Hilo, Big Island 3 12 15
Honolulu, Oahu 8 16 24
Kahului, Maui 12 13 25
Lihue, Kauai 5 18 23

Amount of Sun

Here's another way to look at how much sunshine a city gets. The % Sun number measures the percentage of time between sunrise and sunset that sunshine reaches the ground. Again, these amounts are monthly averages based on many years of weather observations.

Percent sunshine for September
City % Sun
Hilo, Big Island 43
Honolulu, Oahu 77
Kahului, Maui 73
Lihue, Kauai 68

National Climatic Data Center. Comparative Climatic Data.

Hawaii Sunshine
Back to Top