Monthly climate averages for Hilo, United States. Based on 10-year ERA5 reanalysis data.
Af Tropical Rainforest
Climate OverviewHilo, United States in May has warm conditions, with highs averaging 25°C (77°F). Rain falls on about 24 days this month, totalling around 110 mm. Sea temperature reaches 24.8°C (77°F).
This month falls at the end of Spring.
Temperatures remain fairly steady throughout May, with daily highs around 25°C (77°F).
May sees fairly even rainfall, totalling about 110 mm across the month.
The warmest days tend to fall around the 18th, averaging 25.3°C (78°F).
Compared to April, this month is about 0°C cooler with 3 more rainy days.
Daily averages based on historical data (2016–2025)
Daytime temperatures around 25°C (77°F) are ideal for full-day outdoor exploration. Keep afternoons flexible as tropical showers are common — they typically clear within an hour.
Wet weather can spread across much of the day, so it is best to keep outdoor plans flexible.
Recent yearly records for May have stayed close to the long-run average.
| Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January best | 24°C / 19°C | 26°C / 19°C | 15days (95 mm) Wet | 9.8h Good | 84% Humid | 6.2 High | Excellent | View Details |
| February best | 24°C / 18°C | 26°C / 19°C | 18days (169 mm) Wet | 10.1h Excellent | 84% Humid | 6.6 High | Excellent | View Details |
| March | 24°C / 19°C | 27°C / 20°C | 20days (129 mm) Wet | 10.3h Excellent | 85% Humid | 7.5 Very High | Good | View Details |
| April | 25°C / 19°C | 28°C / 21°C | 21days (127 mm) Wet | 11h Excellent | 85% Humid | 8.1 Very High | Good | View Details |
| May | 25°C / 20°C | 29°C / 22°C | 24days (110 mm) Wet | 11.7h Excellent | 85% Humid | 8.2 Very High | Good | View Details |
| June | 26°C / 21°C | 29°C / 22°C | 22days (83 mm) Wet | 12.3h Excellent | 83% Humid | 8.4 Very High | Good | View Details |
| July | 26°C / 21°C | 30°C / 23°C | 23days (99 mm) Wet | 12.2h Excellent | 83% Humid | 8.5 Very High | Wet | View Details |
| August | 27°C / 22°C | 31°C / 24°C | 23days (168 mm) Wet | 11.5h Excellent | 83% Humid | 8.4 Very High | Wet | View Details |
| September | 27°C / 22°C | 31°C / 24°C | 21days (91 mm) Wet | 11.3h Excellent | 83% Humid | 8.3 Very High | Wet | View Details |
| October | 26°C / 21°C | 30°C / 24°C | 17days (105 mm) Wet | 10.4h Excellent | 84% Humid | 7.3 Very High | Good | View Details |
| November best | 25°C / 20°C | 28°C / 22°C | 18days (131 mm) Wet | 9.8h Good | 85% Humid | 5.9 High | Excellent | View Details |
| December best | 24°C / 19°C | 27°C / 21°C | 19days (137 mm) Wet | 9.3h Good | 85% Humid | 5.5 High | Excellent | View Details |
Summer clothing like shorts, t-shirts, and sundresses will be comfortable. Bring a light cardigan for air-conditioned spaces.
A waterproof jacket or compact umbrella is recommended for occasional showers.
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