Climate Chart of Oahu (Hawaii), USA
Monthly data: Temperature °C, Rain (mm), Sunshine (h) · 2013–2023
For Oahu (Hawaii), USA, the climate data describe 2013–2023. The monthly mean temperature stays within a span marked by February at 21.4 °C and August / September at 25.3 °C, giving a sense of the year-round average-temperature pattern rather than daytime highs. Daily rainfall and sunshine also vary by month, so visitors can use their separate averages to help plan while remembering that they do not predict conditions on any particular day.
Climate overview
Temperature
Monthly mean temperatures are highest in August / September and 25.3 °C, while the lowest monthly mean is 21.4 °C in February. These figures describe monthly averages, not daytime maximum temperatures, so they are best read as a broad guide to the temperature pattern rather than a forecast of afternoon conditions. The unweighted mean of the monthly temperature means is 23.4 °C. It summarizes the calendar-month averages without weighting them by the number of days in each month.
Rain
Mean daily rainfall reaches its monthly high in March at 2.33 mm/day. Visitors planning outdoor activities around that month may want to allow for rain in their plans, though this average does not reveal how often rain falls or guarantee wet conditions on a particular day. The lowest monthly mean daily rainfall is 1.01 mm/day in July; this can be a useful reference for visitors prioritising lower average rainfall, not a promise of dry weather. Across the calendar-month means, the unweighted mean daily rainfall is 1.52 mm/day, and these daily averages are not monthly rainfall totals.
Sunshine
Mean daily sunshine is highest in June at 12.35 hours/day and lowest in December at 9.13 hours/day. The contrast can help with broad planning for daylight outdoor activities, but sunshine duration is not the same as day length and does not ensure clear skies throughout a day. The unweighted mean across the monthly sunshine averages is 10.73 hours/day per day, a summary of the calendar-month means rather than a day-weighted annual average.
Best Travel Time Guide for Oahu (Hawaii), USA: Ideal Seasons and Weather Insights
For visitors prioritising cooler monthly average temperatures, February is the relevant reference point, with a monthly mean of 21.4 °C; this is not a daytime-high figure, so it cannot specify how warm an individual afternoon will feel. If lower average rainfall is the priority, July is the conditional option, with mean daily rainfall of 1.01 mm/day. For travel in March, when the monthly mean daily rainfall is 2.33 mm/day, consider packing rain protection; neither average measures rain frequency or guarantees the weather on your dates. For daylight outdoor planning, mean daily sunshine peaks in June at 12.35 hours/day, while the lowest monthly mean is in December at 9.13 hours/day. These are sunshine-duration averages, not measures of day length or assurances of clear conditions, so use them as broad context rather than a daily forecast.
Climate Data Overview for Oahu (Hawaii), USA
Explore the comprehensive climate data for Oahu (Hawaii), USA. This detailed table provides valuable insights into temperature variations, precipitation levels, and seasonal changes, helping you understand the unique weather patterns of this region.
| Month | Average: Temperature °C | Rain (mm) / day | Snow (mm) / day | Sunshine (h) / day |
|---|---|---|---|---|
| Jan | 21.6 | 1.21 | 0.00 | 9.62 |
| Feb | 21.4 | 2.01 | 0.00 | 9.75 |
| Mar | 21.6 | 2.33 | 0.00 | 10.13 |
| Apr | 22.6 | 1.62 | 0.00 | 10.96 |
| May | 23.4 | 1.48 | 0.00 | 11.76 |
| Jun | 24.3 | 1.12 | 0.00 | 12.35 |
| Jul | 24.9 | 1.01 | 0.00 | 12.21 |
| Aug | 25.3 | 1.35 | 0.00 | 11.68 |
| Sep | 25.3 | 1.07 | 0.00 | 11.03 |
| Oct | 24.6 | 1.83 | 0.00 | 10.36 |
| Nov | 23.5 | 1.18 | 0.00 | 9.74 |
| Dec | 22.2 | 2.03 | 0.00 | 9.13 |
| Average | 23.4 | 1.52 | 0.00 | 10.73 |
