Hilo weather in August
In August, Hilo sees average daytime highs of 77°F and overnight lows near 72°F, with 6.7 in of rain across 25.6 wet days and about 12.7 hours of daylight. It is the 2nd-warmest and 5th-wettest month of the year here.
Day-to-day highs hold fairly steady near 77°F through the month. The sky is clear or mostly clear about 30% of the time in August, and the air most often feels muggy.
Daylight stretches from about 12 h 54 min at the start of August to 12 h 24 min by month's end. Set against the rest of the year, August is Hilo's 4th-clearest and 9th-windiest month. For the whole year in context, see Hilo's year-round climate.
- Daytime high
- 77°
- 2nd warmest
- Overnight low
- 72°
- 12th coldest
- Rainfall
- 6.7 in
- 25.6 wet days
- Daylight
- 12 h 42 min
- 6:04 AM – 6:45 PM
- Cloud cover
- 54%
- 4th clearest
- Wind
- 6 mph
- 9th windiest
- Solar energy
- 6.38 kWh/m²
- Travel score
- 4.6
- 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 August
Day-to-day highs hold fairly steady near 77°F through the month.
A typical August day in Hilo reaches about 77°F in the afternoon and slips back to 72°F overnight — a 5°F spread between the day's warmth and the night's chill. On most days the high lands between 75°F and 79°F. Set against its neighbours, August runs on par with July and on par with September.
| 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 |
| Avg low (°F) | 72 | 72 | 72 | 72 | 72 | 72 | 72 | 72 | 72 | 72 | 72 | 72 | 72 | 72 | 72 | 72 | 72 | 72 | 72 | 72 | 72 | 72 | 72 | 72 | 72 | 72 | 72 | 72 | 72 | 72 | 72 |
| Avg high (°F) | Avg low (°F) | |
|---|---|---|
| 1 | 77 | 72 |
| 2 | 77 | 72 |
| 3 | 77 | 72 |
| 4 | 77 | 72 |
| 5 | 77 | 72 |
| 6 | 77 | 72 |
| 7 | 77 | 72 |
| 8 | 77 | 72 |
| 9 | 77 | 72 |
| 10 | 77 | 72 |
| 11 | 77 | 72 |
| 12 | 77 | 72 |
| 13 | 77 | 72 |
| 14 | 77 | 72 |
| 15 | 77 | 72 |
| 16 | 77 | 72 |
| 17 | 77 | 72 |
| 18 | 77 | 72 |
| 19 | 77 | 72 |
| 20 | 77 | 72 |
| 21 | 77 | 72 |
| 22 | 77 | 72 |
| 23 | 77 | 72 |
| 24 | 77 | 72 |
| 25 | 77 | 72 |
| 26 | 77 | 72 |
| 27 | 77 | 72 |
| 28 | 77 | 72 |
| 29 | 77 | 72 |
| 30 | 77 | 72 |
| 31 | 77 | 72 |
Hilo weather by month
How August compares with the rest of the year at a glance. August is the 2nd-warmest and 5th-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 August
The sky is clear or mostly clear about 30% of the time in August.
Beyond those clear spells, partly cloudy skies cover about 37% of August, with mostly cloudy or overcast conditions the remaining 33%. Skies tend to open up as the month goes on.
| 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 64 | 64 | 64 | 65 | 65 | 65 | 65 | 66 | 66 | 67 | 67 | 67 | 68 | 68 | 68 | 68 | 68 | 67 | 68 | 67 | 68 | 68 | 67 | 67 | 67 | 67 | 67 | 67 | 68 | 68 | 69 |
| Cloudier (%) | 36 | 36 | 36 | 35 | 35 | 35 | 35 | 34 | 34 | 33 | 33 | 33 | 32 | 32 | 32 | 32 | 32 | 33 | 32 | 33 | 32 | 32 | 33 | 33 | 33 | 33 | 33 | 33 | 32 | 32 | 31 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 64 | 36 |
| 2 | 64 | 36 |
| 3 | 64 | 36 |
| 4 | 65 | 35 |
| 5 | 65 | 35 |
| 6 | 65 | 35 |
| 7 | 65 | 35 |
| 8 | 66 | 34 |
| 9 | 66 | 34 |
| 10 | 67 | 33 |
| 11 | 67 | 33 |
| 12 | 67 | 33 |
| 13 | 68 | 32 |
| 14 | 68 | 32 |
| 15 | 68 | 32 |
| 16 | 68 | 32 |
| 17 | 68 | 32 |
| 18 | 67 | 33 |
| 19 | 68 | 32 |
| 20 | 67 | 33 |
| 21 | 68 | 32 |
| 22 | 68 | 32 |
| 23 | 67 | 33 |
| 24 | 67 | 33 |
| 25 | 67 | 33 |
| 26 | 67 | 33 |
| 27 | 67 | 33 |
| 28 | 67 | 33 |
| 29 | 68 | 32 |
| 30 | 68 | 32 |
| 31 | 69 | 31 |
Chance of precipitation in August
Hilo gets around 6.7 in of rain over 25.6 wet days in August. 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 86% on the wettest days. The odds ease toward the end of the month.
| 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 86 | 86 | 86 | 86 | 86 | 86 | 86 | 86 | 86 | 86 | 85 | 85 | 85 | 85 | 84 | 84 | 84 | 83 | 83 | 82 | 81 | 81 | 80 | 79 | 78 | 78 | 77 | 76 | 75 | 75 | 74 |
| Rain chance (%) | |
|---|---|
| 1 | 86 |
| 2 | 86 |
| 3 | 86 |
| 4 | 86 |
| 5 | 86 |
| 6 | 86 |
| 7 | 86 |
| 8 | 86 |
| 9 | 86 |
| 10 | 86 |
| 11 | 85 |
| 12 | 85 |
| 13 | 85 |
| 14 | 85 |
| 15 | 84 |
| 16 | 84 |
| 17 | 84 |
| 18 | 83 |
| 19 | 83 |
| 20 | 82 |
| 21 | 81 |
| 22 | 81 |
| 23 | 80 |
| 24 | 79 |
| 25 | 78 |
| 26 | 78 |
| 27 | 77 |
| 28 | 76 |
| 29 | 75 |
| 30 | 75 |
| 31 | 74 |
Humidity in August
Most of August feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, August lands in the muggy band about 72% of days. Sticky, muggy-or-worse air turns up on roughly 95% 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Humid (%) | 4 | 4 | 4 | 4 | 4 | 4 | 3 | 3 | 3 | 4 | 4 | 4 | 4 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 6 | 6 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 |
| Muggy (%) | 73 | 73 | 73 | 73 | 73 | 72 | 73 | 73 | 73 | 72 | 72 | 72 | 72 | 71 | 71 | 71 | 71 | 72 | 72 | 72 | 72 | 72 | 73 | 73 | 73 | 73 | 73 | 74 | 74 | 74 | 74 |
| Oppressive (%) | 23 | 23 | 23 | 23 | 23 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 23 | 23 | 23 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 21 | 21 | 21 | 21 |
| Humid (%) | Muggy (%) | Oppressive (%) | |
|---|---|---|---|
| 1 | 4 | 73 | 23 |
| 2 | 4 | 73 | 23 |
| 3 | 4 | 73 | 23 |
| 4 | 4 | 73 | 23 |
| 5 | 4 | 73 | 23 |
| 6 | 4 | 72 | 24 |
| 7 | 3 | 73 | 24 |
| 8 | 3 | 73 | 24 |
| 9 | 3 | 73 | 24 |
| 10 | 4 | 72 | 24 |
| 11 | 4 | 72 | 24 |
| 12 | 4 | 72 | 24 |
| 13 | 4 | 72 | 24 |
| 14 | 5 | 71 | 24 |
| 15 | 5 | 71 | 24 |
| 16 | 5 | 71 | 24 |
| 17 | 5 | 71 | 24 |
| 18 | 5 | 72 | 23 |
| 19 | 5 | 72 | 23 |
| 20 | 5 | 72 | 23 |
| 21 | 6 | 72 | 22 |
| 22 | 6 | 72 | 22 |
| 23 | 5 | 73 | 22 |
| 24 | 5 | 73 | 22 |
| 25 | 5 | 73 | 22 |
| 26 | 5 | 73 | 22 |
| 27 | 5 | 73 | 22 |
| 28 | 5 | 74 | 21 |
| 29 | 5 | 74 | 21 |
| 30 | 5 | 74 | 21 |
| 31 | 5 | 74 | 21 |
Wind in August
Winds average 6 mph in August.
Across August, daily wind ranges from about 5 mph on the calmest days to 6 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (mph) | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 |
| 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 | calm |
| Wind speed (mph) | Feels | |
|---|---|---|
| 1 | 6 | calm |
| 2 | 6 | calm |
| 3 | 6 | calm |
| 4 | 6 | calm |
| 5 | 6 | calm |
| 6 | 6 | calm |
| 7 | 6 | calm |
| 8 | 6 | calm |
| 9 | 6 | calm |
| 10 | 6 | calm |
| 11 | 6 | calm |
| 12 | 6 | calm |
| 13 | 6 | calm |
| 14 | 6 | calm |
| 15 | 6 | calm |
| 16 | 6 | calm |
| 17 | 6 | calm |
| 18 | 6 | calm |
| 19 | 6 | calm |
| 20 | 6 | calm |
| 21 | 5 | calm |
| 22 | 5 | calm |
| 23 | 5 | calm |
| 24 | 5 | calm |
| 25 | 5 | calm |
| 26 | 5 | calm |
| 27 | 5 | calm |
| 28 | 5 | calm |
| 29 | 5 | calm |
| 30 | 5 | calm |
| 31 | 5 | calm |
Sunrise & sunset in August
Daylight runs from about 12 h 54 min at the start of August to 12 h 24 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 30 minutes over August. Sunrise moves from 5:59 AM to 6:08 AM, and sunset from 6:54 PM to 6:33 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 12.9 | 12.9 | 12.9 | 12.9 | 12.8 | 12.8 | 12.8 | 12.8 | 12.8 | 12.8 | 12.8 | 12.7 | 12.7 | 12.7 | 12.7 | 12.7 | 12.7 | 12.6 | 12.6 | 12.6 | 12.6 | 12.6 | 12.6 | 12.5 | 12.5 | 12.5 | 12.5 | 12.5 | 12.4 | 12.4 | 12.4 |
| Sunrise (AM) | 5:59 | 6:00 | 6:00 | 6:00 | 6:01 | 6:01 | 6:01 | 6:02 | 6:02 | 6:02 | 6:03 | 6:03 | 6:03 | 6:04 | 6:04 | 6:04 | 6:04 | 6:05 | 6:05 | 6:05 | 6:06 | 6:06 | 6:06 | 6:06 | 6:07 | 6:07 | 6:07 | 6:07 | 6:08 | 6:08 | 6:08 |
| Sunset (PM) | 6:54 | 6:53 | 6:53 | 6:52 | 6:52 | 6:51 | 6:50 | 6:50 | 6:49 | 6:49 | 6:48 | 6:47 | 6:47 | 6:46 | 6:45 | 6:45 | 6:44 | 6:43 | 6:43 | 6:42 | 6:41 | 6:40 | 6:40 | 6:39 | 6:38 | 6:37 | 6:36 | 6:35 | 6:35 | 6:34 | 6:33 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 12.9 | 5:59 | 6:54 |
| 2 | 12.9 | 6:00 | 6:53 |
| 3 | 12.9 | 6:00 | 6:53 |
| 4 | 12.9 | 6:00 | 6:52 |
| 5 | 12.8 | 6:01 | 6:52 |
| 6 | 12.8 | 6:01 | 6:51 |
| 7 | 12.8 | 6:01 | 6:50 |
| 8 | 12.8 | 6:02 | 6:50 |
| 9 | 12.8 | 6:02 | 6:49 |
| 10 | 12.8 | 6:02 | 6:49 |
| 11 | 12.8 | 6:03 | 6:48 |
| 12 | 12.7 | 6:03 | 6:47 |
| 13 | 12.7 | 6:03 | 6:47 |
| 14 | 12.7 | 6:04 | 6:46 |
| 15 | 12.7 | 6:04 | 6:45 |
| 16 | 12.7 | 6:04 | 6:45 |
| 17 | 12.7 | 6:04 | 6:44 |
| 18 | 12.6 | 6:05 | 6:43 |
| 19 | 12.6 | 6:05 | 6:43 |
| 20 | 12.6 | 6:05 | 6:42 |
| 21 | 12.6 | 6:06 | 6:41 |
| 22 | 12.6 | 6:06 | 6:40 |
| 23 | 12.6 | 6:06 | 6:40 |
| 24 | 12.5 | 6:06 | 6:39 |
| 25 | 12.5 | 6:07 | 6:38 |
| 26 | 12.5 | 6:07 | 6:37 |
| 27 | 12.5 | 6:07 | 6:36 |
| 28 | 12.5 | 6:07 | 6:35 |
| 29 | 12.4 | 6:08 | 6:35 |
| 30 | 12.4 | 6:08 | 6:34 |
| 31 | 12.4 | 6:08 | 6:33 |
Solar energy in August
Average shortwave solar energy reaching the ground each day in August, about 6.38 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 — August's 6.38 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 | 6.4 | 6.4 | 6.4 | 6.4 | 6.4 | 6.4 | 6.4 | 6.4 | 6.4 | 6.4 | 6.4 | 6.4 | 6.4 | 6.4 | 6.4 | 6.4 | 6.4 | 6.3 | 6.3 | 6.3 | 6.3 | 6.3 | 6.3 | 6.3 | 6.3 | 6.3 |
| Level | 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 | Intense | Intense | Intense | Intense | Intense | Intense |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 6.5 | Intense |
| 2 | 6.5 | Intense |
| 3 | 6.5 | Intense |
| 4 | 6.5 | Intense |
| 5 | 6.5 | Intense |
| 6 | 6.4 | Intense |
| 7 | 6.4 | Intense |
| 8 | 6.4 | Intense |
| 9 | 6.4 | Intense |
| 10 | 6.4 | Intense |
| 11 | 6.4 | Intense |
| 12 | 6.4 | Intense |
| 13 | 6.4 | Intense |
| 14 | 6.4 | Intense |
| 15 | 6.4 | Intense |
| 16 | 6.4 | Intense |
| 17 | 6.4 | Intense |
| 18 | 6.4 | Intense |
| 19 | 6.4 | Intense |
| 20 | 6.4 | Intense |
| 21 | 6.4 | Intense |
| 22 | 6.4 | 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 |
| 31 | 6.3 | Intense |
Hazard calendar for Hilo
In August, Hilo sits inside its pacific hurricane season. The full year is below, with each hazard's peak months called out.
Hilo sits in the eastern Pacific hurricane zone; the season peaks August–September.
Is August a good time to visit Hilo?
Our two travel scores rate August for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
August is a reasonable time to visit Hilo for sightseeing.
What to pack for Hilo in August
From August's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In August, Hilo sees daytime highs around 77°F and nights near 72°F. Pack rain gear and sun protection. Worth having: light clothes. About 26 days see rain.
Sea temperature near Hilo in August
The nearest coast averages about 79°F in August — 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 August
Clear-sky midday UV in August 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 August
Average fine-particle pollution (PM2.5) through the year — so you can see where August 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).