Temperature
Pleasant by day, mild at night.
76°Ftypical September high
Typical range
September climate
September in Big Island
United States · North America
Hurricane risk and late-day mugginess are the main limitations.
Some tradeoffs
Daytime high
76°F
Lows around 71°F
Rain
Rain most days
Sun
11.5 h/day
Air feel
Humid
Sea temp
80°F
Great for swimming
When to visit
Month-by-month fit
Best
Precipitation
It rains on most days, and rain often persists for longer stretches. About 29 wet days, more than in most months.
96%wet-day frequency
AmountWet-day chance
Sunshine
Cloudier spells limit sunshine.
11.6 hSeptember sunshine
Heat & humidity by month
Humid air and frequent rain shape this month.
96%September Heat feel
Easy airWarm airHumid air
Hourly temperature pattern
In September, afternoons feel about 79° and nights feel near 76°.
ComfortableWarmNight hours
Clear sky
Mostly cloudy skies this month.
34%September Clear sky
Clear skyCloud
Wind pattern
Calm winds are typical in September.
4 mphSeptember Calm
Sea temperature
80°FSeptember sea temp
More detailIncludes daypart comfort
Typical September day
September late afternoons are around 75°F, easing to about 73°F in early evening.
Avg temp Typical range
Morning75°F
Feels 79°F
Rain58%
Cloud60%
Humid airVery high
Sun intensityModerate
Midday75°F
Feels 80°F
Rain90%
Cloud61%
Humid airVery high
Sun intensityStrong
Late afternoon75°F
Feels 79°F
Rain88%
Cloud66%
Humid airVery high
Sun intensityModerate
Early evening73°F
Feels 78°F
Rain68%
Cloud67%
Humid airVery high
Sun intensityMinimal
Best windowData tableView month-by-month numbers
View month-by-month numbers
| Month | High°F | Low°F | Rainin | Wet days | Sunh | Humidity% | Sea°F |
|---|---|---|---|---|---|---|---|
| Jan | 73 | 67 | 5.3 | 20 | 10.5 | 79 | 77 |
| Feb | 72 | 67 | 5.4 | 20 | 10.6 | 79 | 76 |
| Mar | 73 | 67 | 6.7 | 22 | 10.7 | 80 | 76 |
| Apr | 73 | 68 | 10.7 | 25 | 11.8 | 83 | 76 |
| May | 74 | 69 | 12.9 | 28 | 12.3 | 84 | 77 |
| Jun | 75 | 70 | 16.1 | 30 | 12.7 | 85 | 78 |
| Jul | 76 | 71 | 15.1 | 31 | 12.8 | 85 | 79 |
| Aug | 77 | 71 | 15.3 | 31 | 12.4 | 85 | 80 |
| Sep | 76 | 71 | 13.0 | 29 | 11.6 | 84 | 80 |
| Oct | 76 | 71 | 9.4 | 27 | 11.2 | 83 | 80 |
| Nov | 75 | 70 | 6.5 | 22 | 10.3 | 81 | 79 |
| Dec | 74 | 68 | 6.4 | 22 | 10.2 | 80 | 78 |
Similar climates
Similar
Similar travel styleKauaiUnited StatesSimilar travel styleNassauBahamasSimilar travel styleHonoluluUnited StatesSimilar travel styleHuatulcoMexico
Want a side-by-side climate view? Compare Big Island with Kauai.
Climate data notePlanning guidance, not a forecast
Typical monthly values are based on long-term climate records. Useful for planning, not a forecast. Check the weather before you travel.
Sunshine: source type is not yet identified at metric level.
Local microclimates can vary by beach, neighborhood, trail, or elevation.
Last updated: Jun 29, 2026
Data & methodology