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Best time to visit · Hawaii, United States
For the most comfortable weather in Big Island, aim for June – October. July tops our comfort score at 71/100, with highs around 57°F (14°C) and 4.7 in (120 mm) of rain. January & February, May and November are good shoulder-season months. The toughest months are March & April, mainly because of rain.
Highs run from 50°F to 58°F across the year, and the yearly total is about 71.5 in (1816 mm) of rain.
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high | 50°F10°C | 50°F10°C | 51°F10°C | 52°F11°C | 54°F12°C | 56°F13°C | 57°F14°C | 58°F14°C | 56°F14°C | 55°F13°C | 53°F12°C | 51°F10°C |
| Avg low | 37°F3°C | 37°F3°C | 38°F4°C | 39°F4°C | 41°F5°C | 42°F5°C | 43°F6°C | 43°F6°C | 43°F6°C | 43°F6°C | 41°F5°C | 39°F4°C |
| Rain | 5.8 in147 mm | 6.1 in155 mm | 8.8 in224 mm | 7.6 in192 mm | 5.4 in138 mm | 4.2 in106 mm | 4.7 in120 mm | 5.5 in140 mm | 4.7 in119 mm | 5.3 in135 mm | 6.7 in169 mm | 6.7 in171 mm |
| Humidity | 84% | 84% | 84% | 83% | 82% | 81% | 81% | 81% | 82% | 84% | 85% | 86% |
| Cloud | 50% | 56% | 62% | 61% | 57% | 54% | 51% | 50% | 51% | 56% | 56% | 54% |
| Comfort | 57 | 54 | 45 | 51 | 62 | 69 | 71 | 70 | 70 | 65 | 56 | 53 |
Source: NASA POWER (public domain), 2001–2025 monthly averages on a ~50 km satellite and reanalysis grid, so coasts and valleys can differ from what's shown. Temperatures were adjusted from the grid cell's ~1,145 m (3,757 ft) to Big Island's ~2,652 m (8,701 ft) elevation using the standard lapse rate of 6.5°C per 1,000 m. Precipitation includes snow as melted water; daylight is calculated from latitude. Check a forecast before you go.
Temperatures barely move through the year in Big Island (highs stay between 50°F and 58°F), so rain is what really separates the seasons.
Temperatures hold fairly even, with highs of 54–58°F (12–14°C). It's the driest half, with only about 29.8 in (758 mm) of rain, 42% of the year's total. Lows bottom out around 41°F (5°C). June – October are among the best-scoring months (season average 68/100).
Expect steady highs of 50–53°F (10–12°C). It's the wettest half, with about 41.7 in (1058 mm) of rain, 58% of the year's total. It holds the toughest stretch on our comfort score (March & April), averaging 53/100.
By comfort score: 6 Good and 6 Fair. Tap a month for its own guide.
For the most comfortable weather in Big Island, aim for June – October. July tops our comfort score at 71/100, with highs around 57°F (14°C) and 4.7 in (120 mm) of rain. January & February, May and November are good shoulder-season months. The toughest months are March & April, mainly because of rain.
March is the wettest month, averaging about 8.8 in (224 mm) of rain. June is the driest, with about 4.2 in (106 mm). The yearly total is around 71.5 in (1816 mm).
January is the coldest, with average lows of 37°F (3°C) and highs of 50°F (10°C). The warmest is August, with average highs of 58°F (14°C).
Not especially for the tropics: humidity averages 83% over the year, and no month pairs warm temperatures with 75%+ humidity.
Not on average: even in January, the coldest month, lows average 37°F (3°C). Individual cold snaps can still dip lower.
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