Hilo, United States experiences average highs of 25°C (77°F) and lows of 20°C (68°F) throughout the year. Rainfall is frequent, averaging about 20 rainy days per month. Sunshine is abundant, averaging about 11 hours per day. Average highs have warmed by 0.7°C (1.3°F) across the available records.
Hilo, United States Weather & Climate 2026
Monthly climate averages for Hilo, United States. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Jan–Dec 
Wetter season: Apr–Sep At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
7.6/10
Best: January, February, November, December
UV Index
7
High
Temperature 25°C / 20°C
Feels Like 28°C / 22°C
Rainy Days 20
Rainfall 120 mm
Sunshine 11 h
Humidity 84%
Wind Speed 18 km/h
Dew Point 20°C
Hottest Month
27°C
September
Avg Low22°C
Rain21days
Coldest Month
18°C
February
Avg High24°C
Rain18days
Driest Month
15days
January
Avg High24°C
Avg Low19°C
Windiest Month
20 km/h
July (Gusts 40)
Sea Temperature
24°C – 27°C
Warmest water: September (
26.6°C
)
Worst Time to Visit
Consider avoiding July, August, September due to heavy rainfall.
Sun Position
Sunrise 05:43
Daylight 13.3h
Sunset 19:02
Live conditions—
Hilo on the map · live conditions
Hilo, United States
- Continent
- Americas
- Country
- United States
- City
- Hilo
- Population
- 43.3K
- Elevation
- 18 m
- Coordinates
- 19.73°, -155.09°
Seasonal Breakdown
Spring
Mar–May
Avg High 25°C
Avg Low 19°C
Rain 22 days/mo
Summer
Jun–Aug
Avg High 26°C
Avg Low 21°C
Rain 23 days/mo
Autumn
Sep–Nov
Avg High 26°C
Avg Low 21°C
Rain 19 days/mo
1/3 best months
Winter
Dec–Feb
Avg High 24°C
Avg Low 19°C
Rain 17 days/mo
3/3 best months
Climate Charts
Based on historical averages (2016–2025)
Monthly Temperatures
HighLowShaded bands show the typical range across the available yearly records.
Line chart showing monthly temperatures. Jan: 24°C / 19°C . Feb: 24°C / 18°C . Mar: 24°C / 19°C . Apr: 25°C / 19°C . May: 25°C / 20°C . Jun: 26°C / 21°C . Jul: 26°C / 21°C . Aug: 27°C / 22°C . Sep: 27°C / 22°C . Oct: 26°C / 21°C . Nov: 25°C / 20°C . Dec: 24°C / 19°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 95 mm. Feb: 169 mm. Mar: 129 mm. Apr: 127 mm. May: 110 mm. Jun: 83 mm. Jul: 99 mm. Aug: 168 mm. Sep: 91 mm. Oct: 105 mm. Nov: 131 mm. Dec: 137 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 84%. Feb: 84%. Mar: 85%. Apr: 85%. May: 85%. Jun: 83%. Jul: 83%. Aug: 83%. Sep: 83%. Oct: 84%. Nov: 85%. Dec: 85%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 17 km/h . Feb: 18 km/h . Mar: 19 km/h . Apr: 18 km/h . May: 18 km/h . Jun: 18 km/h . Jul: 20 km/h . Aug: 19 km/h . Sep: 18 km/h . Oct: 17 km/h . Nov: 18 km/h . Dec: 18 km/h .
Sunshine
Sunshine
Sunshine: Jan: 10h. Feb: 10h. Mar: 10h. Apr: 11h. May: 12h. Jun: 12h. Jul: 12h. Aug: 12h. Sep: 11h. Oct: 10h. Nov: 10h. Dec: 9h.
Sea Temperature
Sea Temperatureswim
Line chart showing monthly sea temperature. Jan: 25°C . Feb: 25°C . Mar: 24°C . Apr: 24°C . May: 25°C . Jun: 26°C . Jul: 26°C . Aug: 27°C . Sep: 27°C . Oct: 27°C . Nov: 26°C . Dec: 26°C .
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 6. Feb: UV 7. Mar: UV 8. Apr: UV 8. May: UV 8. Jun: UV 8. Jul: UV 9. Aug: UV 8. Sep: UV 8. Oct: UV 7. Nov: UV 6. Dec: UV 6.
Monthly Daylight Hours
Daylight12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy Oppressive
Climate Trends
Average highs have warmed by 0.7°C (1.3°F) across the available records. Average rainfall is trending drier by about 60 mm.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Aug 2025 · 27°C | Sep · 27°C |
| Coldest month | Feb 2025 · 19°C | Feb · 18°C |
| Wettest month | Nov 2025 · 164 mm | Feb · 169 mm |
| Windiest month | Aug 2025 · 20 km/h | Jul · 20 km/h |
Month-by-Month Weather Table
January best
Excellent 
February best
Excellent March
Good April
Good May
Good June
Good July
Wet August
Wet September
Wet October
Good November best
Excellent December best
Excellent | 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 |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Hilo are January, February, November, December, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Hilo, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Hilo is September, with average daytime highs of 27°C (80°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Hilo is February, with average overnight lows of 18°C (65°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Hilo is February, averaging 169mm of precipitation across 18 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Hilo runs through May, July, August, June, with the heaviest rainfall in May. Based on 10-year averages for Hilo.
Hilo receives approximately 130 sunshine hours per year. The sunniest month is June with around 12 hours. Based on climate data for Hilo.
The least favorable months to visit Hilo are July, August, September, primarily due to heavy rainfall. For the best conditions, consider January, February, November, December instead.
The annual average UV index in Hilo is 7, classified as high. SPF 30+ sunscreen, sunglasses, and seeking shade between 10:00–16:00 are strongly recommended.
Average humidity in Hilo is 84%, classified as humid. High humidity makes warm temperatures feel significantly hotter — lightweight, breathable clothing is recommended.
Yes — sea temperatures in January, February, March, April, May, June, July, August, September, October, November, December average 25°C (77°F), which is warm and comfortable for swimming and water activities.
Average wind speeds in Hilo are 18 km/h (11 mph). The windiest month is July with peak winds reaching 20 km/h (12 mph) (gusts up to 40 km/h / 25 mph).
Hilo averages 1 clear-sky days per month with overall cloud cover around 59%. The clearest skies occur in January.
The annual average dew point in Hilo is 20°C (68°F), which feels muggy and uncomfortable. Expect heavy perspiration during warmer months — stay hydrated and take breaks in air-conditioned spaces.
Hilo has a Tropical Rainforest climate, classified as Af under the Köppen system. Tropical climates are warm year-round with high rainfall and temperatures rarely dropping below 18°C (64°F).
The 'feels like' temperature in Hilo ranges from 22°C (72°F) to 28°C (82°F) on average. Humidity and radiant heat mean it often feels warmer than the thermometer reads, especially in summer months.
Yes, June is a great time to visit Hilo. It earns a climate score of 7.6/10 with Good.
For June in Hilo, pack Umbrella, Waterproof jacket, Waterproof shoes, Breathable clothing, Sunscreen (SPF 30+). With average highs of 26°C (78°F) and 22 rainy days, these essentials will keep you comfortable.
Data Source
Climate data derived from ERA5 reanalysis (ECMWF), averaged over 2016–2025. Sea surface temperature from marine reanalysis data. Climate scores and seasonal estimates are computed by WorldStats.
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