Hilo, HI Weather
Hilo hourly forecast: next 24 hours
Today's high of 80°F (26°C) is right in line with the typical September high of 80°F (27°C).
Current conditions in detail
Hilo weather tomorrow (Wednesday, September 16)
Tomorrow in Hilo looks patchy rain nearby, with a high of 79° and an overnight low of 78°. Precipitation chance is modest at 36%. Winds top out near 15 mph, and the UV index reaches 12 (extreme).
Hilo 14-day forecast
About the weather in Hilo
Temperature barely moves in Hilo - 3°C between the average August and the average February. Rainfall does the work instead: 9.9 inches (250 mm) in March against 5.1 inches (130 mm) in June.
Hilo weather: quick facts
- Hottest month: August - highs near 80°F (27°C)
- Coldest month: February - highs near 75°F (24°C)
- Decade extremes (2015-2024): 86°F (30°C) high · 58°F (14°C) low
- Wettest month: March (23 rainy days) · Sunniest: June (11.7 h sun/day)
- Climate type: tropical rainforest
- Annual swing: 3°C between the average warmest and coolest month · day to night: 5°C
- Average humidity: 82%
Temperatures through the year
August is the warm end of the year, averaging 80°F (27°C) by day and 71°F (22°C) overnight. February is the coolest month, with highs of 75°F (24°C) and lows near 65°F (18°C). The gridded 2015-2024 daily record for this location tops out at 86°F (30°C) and bottoms at 58°F (14°C) - decade extremes, not all-time station records. Sunshine averages 10.1 hours a day over the year, peaking in June at 11.7 hours.
Rain, sun and snow
Precipitation concentrates in March - 9.9 inches (250 mm) on 23 days - and thins out by June. Days and nights are about 5°C apart on average - narrower than all but 4% of the 3496 cities in our dataset.
Season by season
March through May
March through May in Hilo is mild and warm, with daytime highs averaging 76°F (24°C) and nights around 67°F (19°C); rain falls on around 74 of the 90 days.
June through August
June through August brings comfortable warmth here - highs near 79°F (26°C), nights near 70°F (21°C), and rain falls on around 76 of the 90 days. Daylight is generous - around 11.5 hours of sun a day.
September through November
Through September through November, Hilo brings comfortable warmth: 79°F (26°C) by day, 70°F (21°C) after dark, and rain falls on around 68 of the 90 days. Daylight is generous - around 10.0 hours of sun a day.
December through February
December through February in Hilo settles into easy warmth, with daytime highs averaging 75°F (24°C) and nights around 65°F (18°C); rain falls on around 56 of the 90 days.
Average temperatures in Hilo by month
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 76° | 65° | 15 | 5.7 in | 9.7 h/day | 79% |
| February | 75° | 65° | 20 | 8.5 in | 9.3 h/day | 80% |
| March | 75° | 66° | 23 | 9.9 in | 8.6 h/day | 82% |
| April | 76° | 67° | 24 | 9.3 in | 9.8 h/day | 82% |
| May | 77° | 68° | 26 | 8.0 in | 10.4 h/day | 82% |
| June | 78° | 69° | 23 | 5.1 in | 11.7 h/day | 82% |
| July | 80° | 70° | 27 | 6.6 in | 11.7 h/day | 82% |
| August | 80° | 71° | 26 | 9.1 in | 11.0 h/day | 83% |
| September | 80° | 71° | 24 | 5.5 in | 10.9 h/day | 81% |
| October | 80° | 70° | 22 | 8.5 in | 10.0 h/day | 81% |
| November | 78° | 68° | 22 | 9.4 in | 9.1 h/day | 82% |
| December | 76° | 66° | 22 | 8.0 in | 8.8 h/day | 82% |