Verdict: Excellent month
Honolulu Weather in September
September runs warm in Honolulu, with daily highs around 29°C (84°F) and nights near 23°C (73°F). Rain is occasional — about 5 wet days in a typical year. Overall, September is one of the best months of the year to be in Honolulu.
Average high
29°C / 84°F
Average low
23°C / 73°F
Rain days
~5
Precipitation
15 mm
What to pack for Honolulu in September
- Summer clothes, plus one light layer for air-con and evenings
- High-SPF sunscreen, sunglasses, and a refillable water bottle
- Comfortable walking shoes — every guide on this site assumes you'll use them
September against the rest of the year
Warmest in Honolulu: Jul (29°C / 84°F) · Coolest: Jan (25°C / 77°F) · Wettest: Mar (~14 rain days)
25°
20°
Jan
25°
20°
Feb
25°
20°
Mar
26°
21°
Apr
27°
22°
May
28°
23°
Jun
29°
23°
Jul
29°
23°
Aug
29°
23°
Sep
29°
23°
Oct
27°
22°
Nov
26°
21°
Dec
Daily highs / lows in °C · bars show rain days per month · ERA5 climate normals (2020–2024)