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Climate · Honolulu

Honolulu in September

Hot and mostly dry, as the days shorten.

Typical weather, averaged over 30 years

September in Honolulu is hot: highs near 86°F, lows near 76°F. Rain falls on about two days a week, and the days shorten by 26 minutes from the first week to the last.September in Honolulu is hot: highs near 30°C, lows near 24°C. Rain falls on about two days a week, and the days shorten by 26 minutes from the first week to the last.

High
86°F30°Caverage
Low
76°F24°Caverage
Wet days
2a week · 24% of days
Daylight
12h 13mon average

Is September a good time to visit Honolulu?

A good month, just outside Honolulu's best months, which run from January to April.

How we judge it: every month is scored on how close its typical high comes to the range from 70°F to 80°F, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.How we judge it: every month is scored on how close its typical high comes to the range from 21°C to 27°C, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.

How September sits in the year

week by week

Temperature

Highs near 86°F in September, against 79°F to 86°F through the year.Highs near 30°C in September, against 26°C to 30°C through the year.

Chance of a wet day

24% of days in September, against 19% to 33% through the year.

Cloud cover

36% cover in September, against 30% to 42% through the year.

Daylight

12h 13m in September, against 10h 51m to 13h 24m through the year.

Week by week, lightly smoothed, with September shaded. The olive line marks the best months. Hover or tap a week for its figures.

Either side

  1. August86°30°low 76°low 24°1 wet day a weekRain on about one day a week.
  2. September86°30°low 76°low 24°2 wet days a weekRain on about two days a week.
  3. October85°29°low 76°low 24°2 wet days a weekRain on about two days a week.

Where Honolulu sits, in September

Pacific/Honolulu
this place
typical high in September 40°F4°C95°F35°C
Sunrise, mid-September
6:18 AMsets 6:36 PM
Above the sea
0 mlow-lying
Latitude
21.3°Nnorthern hemisphere
Nearest of ours
Kihei158 km south-east

The land around Honolulu, shaded by its typical high in September, the planning map's own layer. Hover the map for the figure at that spot; tap it on a phone. Clock times are local, for the 15th.

Elsewhere in United States in September

high · low · wet days
See September on the planning mapThe whole year in Honolulu

Typical weather, averaged over 30 years (1995–2024), read 6 km east of Honolulu. Its own grid square is mostly sea and holds only a daily average, so the page reads the nearest square with a true high and low near the town's height. Temperatures are adjusted against 66 weather stations: daytime highs read about 3.1°F cold in the source data and are raised to match, and both highs and lows are adjusted for the town's height (0 m) against the climate model's (86 m).Temperatures are adjusted against 66 weather stations: daytime highs read about 1.7°C cold in the source data and are raised to match, and both highs and lows are adjusted for the town's height (0 m) against the climate model's (86 m). Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not. Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.

Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not.

Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.