Honolulu is warmest in September, averaging 29° by day and 25° at night. The wettest month is March with 133 mm, and the year brings about 766 mm in total.
Month by month
| Month | High | Low | Rain | Sea | Daylight | Good for |
|---|---|---|---|---|---|---|
| January | 25° | 22° | 90 mm | 25° | 10.8 h | Beach weather |
| February | 25° | 22° | 76 mm | 25° | 11.3 h | Sightseeing |
| March | 25° | 22° | 133 mm | 25° | 11.9 h | Mild |
| April | 26° | 23° | 51 mm | 25° | 12.5 h | Beach weather |
| May | 26° | 23° | 50 mm | 26° | 13.0 h | Beach weather |
| June | 27° | 24° | 27 mm | 26° | 13.3 h | Beach weather |
| July | 28° | 25° | 47 mm | 27° | 13.2 h | Beach weather |
| August | 28° | 25° | 34 mm | 27° | 12.7 h | Beach weather |
| September | 29° | 25° | 36 mm | 27° | 12.1 h | Beach weather |
| October | 28° | 25° | 56 mm | 27° | 11.5 h | Beach weather |
| November | 27° | 24° | 57 mm | 27° | 11.0 h | Beach weather |
| December | 26° | 23° | 109 mm | 26° | 10.7 h | Mild |
High and low are average daily maximum and minimum, rain is typical monthly total, sea is the average surface temperature, daylight is the hours between sunrise and sunset mid-month. Climate normals from NASA POWER and NOAA MUR — averages, not promises.
When to go
Beach weather: January, April, May, June, July, August, September, October and November — highs around 27°, nights no colder than 22°, and at most 90 mm of rain in a month. The sea sits at 25–27° then.
Walking the city: February — highs of 25–25° and no more than 76 mm of rain a month.