Hilo weather in April
In April, Hilo sees average daytime highs of 73°F and overnight lows near 68°F, with 7.1 in of rain across 24.8 wet days and about 12.4 hours of daylight. It is the 9th-warmest and 4th-wettest month of the year here.
Day-to-day highs hold fairly steady near 73°F through the month. The sky is clear or mostly clear about 21% of the time in April, and the air most often feels humid.
Daylight stretches from about 12 h 12 min at the start of April to 12 h 42 min by month's end. Set against the rest of the year, April is Hilo's 10th-clearest and 5th-windiest month. For the whole year in context, see Hilo's year-round climate.
- Daytime high
- 73°
- 9th warmest
- Overnight low
- 68°
- 4th coldest
- Rainfall
- 7.1 in
- 24.8 wet days
- Daylight
- 12 h 24 min
- 6:07 AM – 6:34 PM
- Cloud cover
- 62%
- 10th clearest
- Wind
- 7 mph
- 5th windiest
- Solar energy
- 6.19 kWh/m²
- Travel score
- 4.5
- out of 10
Hilo is human settlement and census-designated place in Hawaii, United States.
- Density
- 287/km²
- people per km²
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in April
Day-to-day highs hold fairly steady near 73°F through the month.
A typical April day in Hilo reaches about 73°F in the afternoon and slips back to 68°F overnight — a 5°F spread between the day's warmth and the night's chill. On most days the high lands between 71°F and 75°F. Set against its neighbours, April runs on par with March and on par with May.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 73 | 73 | 73 | 73 | 73 | 73 | 73 | 73 | 73 | 73 | 73 | 73 | 73 | 73 | 73 | 73 | 73 | 73 | 73 | 73 | 73 | 73 | 73 | 73 | 73 | 73 | 73 | 73 | 73 | 73 |
| Avg low (°F) | 67 | 67 | 67 | 68 | 68 | 68 | 68 | 68 | 68 | 68 | 68 | 68 | 68 | 68 | 68 | 68 | 68 | 68 | 68 | 68 | 68 | 68 | 68 | 68 | 68 | 68 | 68 | 68 | 68 | 68 |
| Avg high (°F) | Avg low (°F) | |
|---|---|---|
| 1 | 73 | 67 |
| 2 | 73 | 67 |
| 3 | 73 | 67 |
| 4 | 73 | 68 |
| 5 | 73 | 68 |
| 6 | 73 | 68 |
| 7 | 73 | 68 |
| 8 | 73 | 68 |
| 9 | 73 | 68 |
| 10 | 73 | 68 |
| 11 | 73 | 68 |
| 12 | 73 | 68 |
| 13 | 73 | 68 |
| 14 | 73 | 68 |
| 15 | 73 | 68 |
| 16 | 73 | 68 |
| 17 | 73 | 68 |
| 18 | 73 | 68 |
| 19 | 73 | 68 |
| 20 | 73 | 68 |
| 21 | 73 | 68 |
| 22 | 73 | 68 |
| 23 | 73 | 68 |
| 24 | 73 | 68 |
| 25 | 73 | 68 |
| 26 | 73 | 68 |
| 27 | 73 | 68 |
| 28 | 73 | 68 |
| 29 | 73 | 68 |
| 30 | 73 | 68 |
Hilo weather by month
How April compares with the rest of the year at a glance. April is the 9th-warmest and 4th-wettest month here — the current month is highlighted below.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 73° / 67° | 5.8 | 16.8 | 10.9 | 6.0 |
| Feb | 72° / 67° | 6.6 | 17.2 | 11.3 | 5.5 |
| Mar | 72° / 67° | 9.1 | 23.5 | 11.9 | 4.7 |
| Apr | 73° / 68° | 7.1 | 24.8 | 12.4 | 4.5 |
| May | 74° / 69° | 5.7 | 23.7 | 12.9 | 4.9 |
| Jun | 75° / 70° | 4.7 | 24.1 | 13.2 | 4.8 |
| Jul | 76° / 71° | 5.7 | 25.8 | 13.1 | 4.6 |
| Aug | 77° / 72° | 6.7 | 25.6 | 12.7 | 4.6 |
| Sep | 77° / 72° | 4.5 | 22 | 12.1 | 5.1 |
| Oct | 77° / 71° | 5.4 | 23 | 11.5 | 5.0 |
| Nov | 75° / 70° | 7.5 | 23.2 | 11.1 | 4.8 |
| Dec | 73° / 68° | 7.9 | 22.2 | 10.8 | 5.1 |
Cloud cover in April
The sky is clear or mostly clear about 21% of the time in April.
Beyond those clear spells, partly cloudy skies cover about 29% of April, with mostly cloudy or overcast conditions the remaining 50%.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 50 | 50 | 49 | 49 | 50 | 49 | 49 | 49 | 49 | 49 | 49 | 48 | 48 | 48 | 48 | 49 | 50 | 50 | 51 | 51 | 51 | 51 | 51 | 52 | 52 | 52 | 52 | 52 | 52 | 52 |
| Cloudier (%) | 50 | 50 | 51 | 51 | 50 | 51 | 51 | 51 | 51 | 51 | 51 | 52 | 52 | 52 | 52 | 51 | 50 | 50 | 49 | 49 | 49 | 49 | 49 | 48 | 48 | 48 | 48 | 48 | 48 | 48 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 50 | 50 |
| 2 | 50 | 50 |
| 3 | 49 | 51 |
| 4 | 49 | 51 |
| 5 | 50 | 50 |
| 6 | 49 | 51 |
| 7 | 49 | 51 |
| 8 | 49 | 51 |
| 9 | 49 | 51 |
| 10 | 49 | 51 |
| 11 | 49 | 51 |
| 12 | 48 | 52 |
| 13 | 48 | 52 |
| 14 | 48 | 52 |
| 15 | 48 | 52 |
| 16 | 49 | 51 |
| 17 | 50 | 50 |
| 18 | 50 | 50 |
| 19 | 51 | 49 |
| 20 | 51 | 49 |
| 21 | 51 | 49 |
| 22 | 51 | 49 |
| 23 | 51 | 49 |
| 24 | 52 | 48 |
| 25 | 52 | 48 |
| 26 | 52 | 48 |
| 27 | 52 | 48 |
| 28 | 52 | 48 |
| 29 | 52 | 48 |
| 30 | 52 | 48 |
Chance of precipitation in April
Hilo gets around 7.1 in of rain over 24.8 wet days in April. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 82% and peaks near 84% on the wettest days.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 83 | 83 | 83 | 84 | 84 | 84 | 84 | 84 | 84 | 84 | 83 | 83 | 83 | 83 | 83 | 83 | 83 | 83 | 82 | 82 | 82 | 81 | 81 | 81 | 81 | 81 | 81 | 80 | 80 | 80 |
| Rain chance (%) | |
|---|---|
| 1 | 83 |
| 2 | 83 |
| 3 | 83 |
| 4 | 84 |
| 5 | 84 |
| 6 | 84 |
| 7 | 84 |
| 8 | 84 |
| 9 | 84 |
| 10 | 84 |
| 11 | 83 |
| 12 | 83 |
| 13 | 83 |
| 14 | 83 |
| 15 | 83 |
| 16 | 83 |
| 17 | 83 |
| 18 | 83 |
| 19 | 82 |
| 20 | 82 |
| 21 | 82 |
| 22 | 81 |
| 23 | 81 |
| 24 | 81 |
| 25 | 81 |
| 26 | 81 |
| 27 | 81 |
| 28 | 80 |
| 29 | 80 |
| 30 | 80 |
Humidity in April
Most of April feels humid — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, April lands in the humid band about 57% of days. Sticky, muggy-or-worse air turns up on roughly 37% of them.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Comfortable (%) | 8 | 8 | 8 | 8 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 8 | 8 | 7 | 7 | 6 | 6 | 5 | 5 | 4 | 4 | 4 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| Humid (%) | 56 | 56 | 56 | 55 | 54 | 54 | 54 | 54 | 54 | 54 | 56 | 57 | 57 | 58 | 58 | 58 | 58 | 59 | 59 | 60 | 60 | 59 | 60 | 59 | 59 | 58 | 57 | 56 | 56 | 55 |
| Muggy (%) | 35 | 35 | 35 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 35 | 35 | 35 | 35 | 35 | 36 | 36 | 36 | 36 | 36 | 36 | 37 | 37 | 38 | 38 | 39 | 40 | 41 | 41 | 42 |
| Oppressive (%) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | |
|---|---|---|---|---|
| 1 | 8 | 56 | 35 | 1 |
| 2 | 8 | 56 | 35 | 1 |
| 3 | 8 | 56 | 35 | 1 |
| 4 | 8 | 55 | 36 | 1 |
| 5 | 9 | 54 | 36 | 1 |
| 6 | 9 | 54 | 36 | 1 |
| 7 | 9 | 54 | 36 | 1 |
| 8 | 9 | 54 | 36 | 1 |
| 9 | 9 | 54 | 36 | 1 |
| 10 | 9 | 54 | 36 | 1 |
| 11 | 9 | 56 | 35 | 0 |
| 12 | 8 | 57 | 35 | 0 |
| 13 | 8 | 57 | 35 | 0 |
| 14 | 7 | 58 | 35 | 0 |
| 15 | 7 | 58 | 35 | 0 |
| 16 | 6 | 58 | 36 | 0 |
| 17 | 6 | 58 | 36 | 0 |
| 18 | 5 | 59 | 36 | 0 |
| 19 | 5 | 59 | 36 | 0 |
| 20 | 4 | 60 | 36 | 0 |
| 21 | 4 | 60 | 36 | 0 |
| 22 | 4 | 59 | 37 | 0 |
| 23 | 3 | 60 | 37 | 0 |
| 24 | 3 | 59 | 38 | 0 |
| 25 | 3 | 59 | 38 | 0 |
| 26 | 3 | 58 | 39 | 0 |
| 27 | 3 | 57 | 40 | 0 |
| 28 | 3 | 56 | 41 | 0 |
| 29 | 3 | 56 | 41 | 0 |
| 30 | 3 | 55 | 42 | 0 |
Wind in April
Winds average 7 mph in April.
Across April, daily wind ranges from about 7 mph on the calmest days to 7 mph at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (mph) | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (mph) | Feels | |
|---|---|---|
| 1 | 7 | calm |
| 2 | 7 | calm |
| 3 | 7 | calm |
| 4 | 7 | calm |
| 5 | 7 | calm |
| 6 | 7 | calm |
| 7 | 7 | calm |
| 8 | 7 | calm |
| 9 | 7 | calm |
| 10 | 7 | calm |
| 11 | 7 | calm |
| 12 | 7 | calm |
| 13 | 7 | calm |
| 14 | 7 | calm |
| 15 | 7 | calm |
| 16 | 7 | calm |
| 17 | 7 | calm |
| 18 | 7 | calm |
| 19 | 7 | calm |
| 20 | 7 | calm |
| 21 | 7 | calm |
| 22 | 7 | calm |
| 23 | 7 | calm |
| 24 | 7 | calm |
| 25 | 7 | calm |
| 26 | 7 | calm |
| 27 | 7 | calm |
| 28 | 7 | calm |
| 29 | 7 | calm |
| 30 | 7 | calm |
Sunrise & sunset in April
Daylight runs from about 12 h 12 min at the start of April to 12 h 42 min by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 30 minutes over April. Sunrise moves from 6:20 AM to 5:57 AM, and sunset from 6:30 PM to 6:39 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 12.2 | 12.2 | 12.2 | 12.2 | 12.2 | 12.3 | 12.3 | 12.3 | 12.3 | 12.3 | 12.4 | 12.4 | 12.4 | 12.4 | 12.4 | 12.4 | 12.5 | 12.5 | 12.5 | 12.5 | 12.5 | 12.6 | 12.6 | 12.6 | 12.6 | 12.6 | 12.6 | 12.7 | 12.7 | 12.7 |
| Sunrise (AM) | 6:20 | 6:19 | 6:18 | 6:17 | 6:16 | 6:16 | 6:15 | 6:14 | 6:13 | 6:12 | 6:11 | 6:10 | 6:10 | 6:09 | 6:08 | 6:07 | 6:06 | 6:05 | 6:05 | 6:04 | 6:03 | 6:02 | 6:02 | 6:01 | 6:00 | 6:00 | 5:59 | 5:58 | 5:58 | 5:57 |
| Sunset (PM) | 6:30 | 6:30 | 6:31 | 6:31 | 6:31 | 6:31 | 6:32 | 6:32 | 6:32 | 6:32 | 6:33 | 6:33 | 6:33 | 6:34 | 6:34 | 6:34 | 6:34 | 6:35 | 6:35 | 6:35 | 6:36 | 6:36 | 6:36 | 6:37 | 6:37 | 6:37 | 6:37 | 6:38 | 6:38 | 6:39 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 12.2 | 6:20 | 6:30 |
| 2 | 12.2 | 6:19 | 6:30 |
| 3 | 12.2 | 6:18 | 6:31 |
| 4 | 12.2 | 6:17 | 6:31 |
| 5 | 12.2 | 6:16 | 6:31 |
| 6 | 12.3 | 6:16 | 6:31 |
| 7 | 12.3 | 6:15 | 6:32 |
| 8 | 12.3 | 6:14 | 6:32 |
| 9 | 12.3 | 6:13 | 6:32 |
| 10 | 12.3 | 6:12 | 6:32 |
| 11 | 12.4 | 6:11 | 6:33 |
| 12 | 12.4 | 6:10 | 6:33 |
| 13 | 12.4 | 6:10 | 6:33 |
| 14 | 12.4 | 6:09 | 6:34 |
| 15 | 12.4 | 6:08 | 6:34 |
| 16 | 12.4 | 6:07 | 6:34 |
| 17 | 12.5 | 6:06 | 6:34 |
| 18 | 12.5 | 6:05 | 6:35 |
| 19 | 12.5 | 6:05 | 6:35 |
| 20 | 12.5 | 6:04 | 6:35 |
| 21 | 12.5 | 6:03 | 6:36 |
| 22 | 12.6 | 6:02 | 6:36 |
| 23 | 12.6 | 6:02 | 6:36 |
| 24 | 12.6 | 6:01 | 6:37 |
| 25 | 12.6 | 6:00 | 6:37 |
| 26 | 12.6 | 6:00 | 6:37 |
| 27 | 12.6 | 5:59 | 6:37 |
| 28 | 12.7 | 5:58 | 6:38 |
| 29 | 12.7 | 5:58 | 6:38 |
| 30 | 12.7 | 5:57 | 6:39 |
Solar energy in April
Average shortwave solar energy reaching the ground each day in April, about 6.19 kWh/m².
For context, solar energy here swings from a low near 4.17 kWh/m² to a high of 6.68 kWh/m² in June across the year — April's 6.19 kWh/m² falls in the middle.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 5.9 | 5.9 | 5.9 | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | 6.1 | 6.1 | 6.1 | 6.1 | 6.2 | 6.2 | 6.2 | 6.2 | 6.2 | 6.3 | 6.3 | 6.3 | 6.3 | 6.3 | 6.3 | 6.3 | 6.3 | 6.3 | 6.3 | 6.3 | 6.3 | 6.3 |
| Level | Bright | Bright | Bright | Bright | Bright | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 5.9 | Bright |
| 2 | 5.9 | Bright |
| 3 | 5.9 | Bright |
| 4 | 6.0 | Bright |
| 5 | 6.0 | Bright |
| 6 | 6.0 | Intense |
| 7 | 6.0 | Intense |
| 8 | 6.0 | Intense |
| 9 | 6.1 | Intense |
| 10 | 6.1 | Intense |
| 11 | 6.1 | Intense |
| 12 | 6.1 | Intense |
| 13 | 6.2 | Intense |
| 14 | 6.2 | Intense |
| 15 | 6.2 | Intense |
| 16 | 6.2 | Intense |
| 17 | 6.2 | Intense |
| 18 | 6.3 | Intense |
| 19 | 6.3 | Intense |
| 20 | 6.3 | Intense |
| 21 | 6.3 | Intense |
| 22 | 6.3 | Intense |
| 23 | 6.3 | Intense |
| 24 | 6.3 | Intense |
| 25 | 6.3 | Intense |
| 26 | 6.3 | Intense |
| 27 | 6.3 | Intense |
| 28 | 6.3 | Intense |
| 29 | 6.3 | Intense |
| 30 | 6.3 | Intense |
Hazard calendar for Hilo
None of Hilo's seasonal hazards are active in April. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.
Hilo sits in the eastern Pacific hurricane zone; the season peaks August–September.
Is April a good time to visit Hilo?
Our two travel scores rate April for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
April is a reasonable time to visit Hilo for sightseeing.
What to pack for Hilo in April
From April's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In April, Hilo sees daytime highs around 73°F and nights near 68°F. Pack rain gear and sun protection. Worth having: light clothes. About 25 days see rain.
Sea temperature near Hilo in April
The nearest coast averages about 76°F in April — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 11 mi away) is warmest in September at about 80°F and coldest in March near 75°F.
The water stays above 68°F all year — warm enough for a swim any month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°F) | 76 | 75 | 75 | 76 | 77 | 78 | 79 | 79 | 80 | 80 | 78 | 77 |
| Comfort | Warm | Warm | Warm | Warm | Warm | Warm | Warm | Warm | Warm | Warm | Warm | Warm |
| Sea temperature (°F) | Comfort | |
|---|---|---|
| Jan | 76 | Warm |
| Feb | 75 | Warm |
| Mar | 75 | Warm |
| Apr | 76 | Warm |
| May | 77 | Warm |
| Jun | 78 | Warm |
| Jul | 79 | Warm |
| Aug | 79 | Warm |
| Sep | 80 | Warm |
| Oct | 80 | Warm |
| Nov | 78 | Warm |
| Dec | 77 | Warm |
UV index in Hilo in April
Clear-sky midday UV in April peaks around 14 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Hilo peaks around August 15 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 16 at about 7 (high).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 8 | 10 | 12 | 14 | 11 | 13 | 13 | 14 | 13 | 10 | 8 | 7 |
| Level | Very high | Very high | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | High |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 8 | Very high |
| Feb | 10 | Very high |
| Mar | 12 | Extreme |
| Apr | 14 | Extreme |
| May | 11 | Extreme |
| Jun | 13 | Extreme |
| Jul | 13 | Extreme |
| Aug | 14 | Extreme |
| Sep | 13 | Extreme |
| Oct | 10 | Extreme |
| Nov | 8 | Very high |
| Dec | 7 | High |
Air quality in Hilo in April
Average fine-particle pollution (PM2.5) through the year — so you can see where April falls, not just the annual average.
Air quality in Hilo is worst in January — around 28 µg/m³ PM2.5 (moderate), about 1.7× the cleanest month (July, 16 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 28 | 27 | 26 | 23 | 22 | 19 | 16 | 18 | 21 | 25 | 22 | 24 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 28 | Moderate |
| Feb | 27 | Moderate |
| Mar | 26 | Moderate |
| Apr | 23 | Moderate |
| May | 22 | Moderate |
| Jun | 19 | Moderate |
| Jul | 16 | Moderate |
| Aug | 18 | Moderate |
| Sep | 21 | Moderate |
| Oct | 25 | Moderate |
| Nov | 22 | Moderate |
| Dec | 24 | Moderate |
Where is Hilo?
Hilo sits at 19.7°N, 155.1°W, 59 ft above sea level, in United States. The nearest listed city is Kīhei, 113 mi away.
Topography around Hilo
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Hilo.
Within 2 miles, the terrain around Hilo has only modest variations in elevation — a maximum elevation change of 774 ft around an average of 197 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 3,606 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 13,750 ft.
The land around Hilo is covered by trees (34%), water (29%) and grassland (22%) within 2 miles, trees (42%) and water (29%) within 10 miles, and water (49%) and grassland (20%) within 50 miles.
United States travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 100% of US
- price level, 2025
- GDP per capita
- $90,027
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 5.8
- per 100k, 2023
- Road deaths
- 12.7
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Hilo (19.7299°, -155.0907°, elevation 59 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).