Rainy days · Hawaii
How often does it rain in Honolulu?
Honolulu’s rain mostly falls on the mountains and then strolls into town as a rainbow.
Honolulu gets measurable rain or snow on about 89 days a year, adding up to about 16 inches.
November usually brings Honolulu about 9 wet days and 2.2 inches. The wettest month is usually December, with about 9 wet days, and the driest is August, with about 6 wet days. That makes Honolulu number 105 of the 129 US cities we track, rainiest first.
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Rainy days, month by month
| Month | Wet days | Inches |
|---|---|---|
| January | 8 | 1.8 |
| February | 8 | 1.9 |
| March | 9 | 2.4 |
| April | 8 | 0.8 |
| May | 6 | 0.8 |
| June | 6 | 0.5 |
| July | 7 | 0.5 |
| August | 6 | 0.8 |
| September | 7 | 0.8 |
| October | 8 | 1.5 |
| November | 9 | 2.2 |
| December | 9 | 2.2 |
Cities with about as many rainy days
- Boise, Idaho: about 89 wet days a year
- Wichita, Kansas: about 87 wet days a year
- Casper, Wyoming: about 91 wet days a year
Source: NOAA daily precipitation records for the Honolulu area, 1991 to 2020 (at least 30 complete years behind every month), via the Applied Climate Information System. A wet day here means at least a hundredth of an inch of rain or melted snow.