Oahu weather by month
Oahu runs from an average daily high of 80°F in January to 89°F in August, with overnight lows between 67°F (January) and 76°F (August).
March is the wettest month (2.4 inches) and June the driest (0.5 inches); about 16 inches fall in a normal year.
The best months for most visitors are Apr-May and Sep-Oct.
Month by month in Oahu
| Month | Average high | Average low | Rain (in) |
|---|---|---|---|
| January | 80°F | 67°F | 1.8 |
| February | 80°F | 67°F | 1.9 |
| March | 81°F | 68°F | 2.4 |
| April best | 83°F | 70°F | 0.8 |
| May best | 85°F | 72°F | 0.8 |
| June | 87°F | 74°F | 0.5 |
| July | 88°F | 75°F | 0.5 |
| August | 89°F | 76°F | 0.8 |
| September best | 88°F | 75°F | 0.9 |
| October best | 87°F | 74°F | 1.5 |
| November | 84°F | 72°F | 2.2 |
| December | 82°F | 69°F | 2.2 |
The numbers are from NOAA's station at Honolulu Airport (USW00022521). Climate normals 1991-2020: long-run averages, not a forecast.
Questions about Oahu weather
What is the best time to visit Oahu?
The best months for most visitors are Apr-May and Sep-Oct. Best value: Apr–May. Best value: Sep–Oct. Big North Shore surf: Dec–Mar. Whales: Dec–Apr.
What is the hottest and coldest month in Oahu?
August is the hottest (average high 89°F) and January the coolest (average low 67°F).
When does it rain the most in Oahu?
March is the wettest month (2.4 inches) and June the driest (0.5 inches).
Does it snow in Oahu?
The station does not record snowfall as a normal; check the forecast for mountain areas.
Where do these weather numbers come from?
The numbers are from NOAA's station at Honolulu Airport (USW00022521). They are 1991-2020 climate normals (long-run averages), not a forecast. For today's weather use the National Weather Service forecast.