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Hilo, Hawaii climate
Af Tropical rainforest
Hilo has a remarkably steady warm-temperate climate (Tropical rainforest, Köppen Af). The hottest month is August with an average daily high near 28°C, while the coldest is February averaging around 18°C at night. Around 3058 mm of precipitation falls each year, peaking in November (366 mm) and easing off in May (178 mm).
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresClear vs cloudy days
Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day countsHilo climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 26 | 26 | 26 | 26 | 27 | 28 | 28 | 28 | 29 | 28 | 27 | 26 |
| Avg temp (°C) | 22 | 22 | 22 | 23 | 23 | 24 | 25 | 25 | 25 | 24 | 23 | 22 |
| Avg low (°C) | 18 | 18 | 18 | 19 | 20 | 20 | 21 | 21 | 21 | 21 | 20 | 19 |
| Precipitation (mm) | 200 | 260 | 322 | 239 | 178 | 185 | 235 | 287 | 221 | 260 | 366 | 307 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 26 | 26 | 26 | 26 | 27 | 28 |
| Avg temp (°C) | 22 | 22 | 22 | 23 | 23 | 24 |
| Avg low (°C) | 18 | 18 | 18 | 19 | 20 | 20 |
| Precipitation (mm) | 200 | 260 | 322 | 239 | 178 | 185 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 28 | 28 | 29 | 28 | 27 | 26 |
| Avg temp (°C) | 25 | 25 | 25 | 24 | 23 | 22 |
| Avg low (°C) | 21 | 21 | 21 | 21 | 20 | 19 |
| Precipitation (mm) | 235 | 287 | 221 | 260 | 366 | 307 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 16 | 16 | 22 | 25 | 23 | 25 | 27 | 27 | 23 | 23 | 23 | 22 |
| Days with high ≥ 32°C (days) | 0.1 | 0.0 | 0.1 | — | 0.0 | — | 0.2 | 0.1 | 0.7 | 0.3 | 0.1 | — |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 16 | 16 | 22 | 25 | 23 | 25 |
| Days with high ≥ 32°C (days) | 0.1 | 0.0 | 0.1 | — | 0.0 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 27 | 27 | 23 | 23 | 23 | 22 |
| Days with high ≥ 32°C (days) | 0.2 | 0.1 | 0.7 | 0.3 | 0.1 | — |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 52 | 54 | 61 | 61 | 57 | 53 | 53 | 52 | 55 | 58 | 58 | 53 |
| Clear days (≤ 30% cloud) | 4 | 3 | 1 | 0.2 | 0.9 | 1 | 1 | 0.9 | 0.8 | 1 | 2 | 4 |
| Partly cloudy days (30–70%) | 21 | 18 | 19 | 21 | 23 | 25 | 25 | 26 | 24 | 22 | 19 | 20 |
| Cloudy days (≥ 70%) | 7 | 7 | 10 | 9 | 7 | 4 | 5 | 4 | 6 | 8 | 9 | 8 |
| Relative humidity (%) | 81 | 80 | 81 | 81 | 81 | 81 | 82 | 81 | 82 | 82 | 83 | 82 |
| Wind speed (m/s) | 3.7 | 4.0 | 4.2 | 4.4 | 4.1 | 4.3 | 4.3 | 4.3 | 4.0 | 4.0 | 4.2 | 4.1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 52 | 54 | 61 | 61 | 57 | 53 |
| Clear days (≤ 30% cloud) | 4 | 3 | 1 | 0.2 | 0.9 | 1 |
| Partly cloudy days (30–70%) | 21 | 18 | 19 | 21 | 23 | 25 |
| Cloudy days (≥ 70%) | 7 | 7 | 10 | 9 | 7 | 4 |
| Relative humidity (%) | 81 | 80 | 81 | 81 | 81 | 81 |
| Wind speed (m/s) | 3.7 | 4.0 | 4.2 | 4.4 | 4.1 | 4.3 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 53 | 52 | 55 | 58 | 58 | 53 |
| Clear days (≤ 30% cloud) | 1 | 0.9 | 0.8 | 1 | 2 | 4 |
| Partly cloudy days (30–70%) | 25 | 26 | 24 | 22 | 19 | 20 |
| Cloudy days (≥ 70%) | 5 | 4 | 6 | 8 | 9 | 8 |
| Relative humidity (%) | 82 | 81 | 82 | 82 | 83 | 82 |
| Wind speed (m/s) | 4.3 | 4.3 | 4.0 | 4.0 | 4.2 | 4.1 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Hilo Intl AP 87 (NOAA GHCN station USW00021504), about 5 km from the city centre.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.