Hilo, HI weather in August
Expect warm, oppressively humid weather with rain on most days in Hilo in August, with highs near 83°F and lows near 70°F. Rain falls on about 27 days. Pack rain gear.
- Normal high
- 83°F
- Normal low
- 70°F
- Wet days
- 27
- 11.3 in total
- Muggy days
- 30
- dew point 65°F+
How August changes from start to finish
| August 1 | August 31 | |
|---|---|---|
| Normal high | 83°F | 83°F |
| Normal low | 70°F | 70°F |
| Chance of a wet day | 88% | 84% |
| Sunrise / sunset | 5:56 am / 6:57 pm | 6:04 am / 6:36 pm |
| Daylight | 13.0 h | 12.5 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Hawaii time (no daylight saving)).
A typical August day
- 6 am71°Fdew point 67°F
- 9 am78°Fdew point 70°F
- Noon82°Fdew point 70°F
- 3 pm82°Fdew point 70°F
- 6 pm79°Fdew point 70°F
- 9 pm75°Fdew point 70°F
NOAA hourly normals (local standard time) from Hilo Intl Airport (2 mi away); average wind 6 mph.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F0 of 31
- Beach dayshigh 80-95°F, under 0.05 in of rain, afternoon wind under 15 mph9 of 31
- Hot dayshigh 90°F or more0 of 31
- Muggy daysdaily mean dew point 65°F or more30 of 31
- Wet daysat least 0.01 in of rain or melted snow27 of 31
- Notable rainat least 0.10 in18 of 31
- Freezing nightslow 32°F or below0 of 31
Average days per August, counted from daily records for each year 1991-2020.
Rain in August
Normal precipitation is 11.3 in; a dry August brings about 6.8 in and a wet one about 13.1 in (25th and 75th percentiles). About 6 days bring half an inch or more, and about 2 an inch or more.
How August varies from year to year
- Warmest August, 1991-20202019: average high 87°F
- Coolest August1999: average high 81°F
- Wettest August2018: 49.2 in
- Driest August2008: 3.9 in
- Highest reading90°F (August 29, 2015)
- Lowest reading64°F (August 12, 1999)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
August compared with July and September
| July | August | September | |
|---|---|---|---|
| Normal high | 83°F | 83°F | 83°F |
| Normal low | 70°F | 70°F | 70°F |
| Wet days | 27 | 27 | 23 |
| Comfortable days | 0 | 0 | 0 |
| Daylight | 13.2 h | 12.8 h | 12.3 h |
Highs change by 0°F from July and 0°F into September.
Nearby alternatives in August
- Warmer: Kihei, HI114 mi · high 90°F · 7 wet days
- Drier: Kailua-Kona, HI59 mi · high 87°F · 5 wet days
How Hilo ranks in August
- Normal high253rd warmest of 378 cities; 7th of 7 in Hawaii
- Wet days378th driest of 378
- Comfortable days300th most of 341
What to pack for Hilo in August
- A rain jacket or umbrella – rain on about 27 days
Heating and cooling
August has 0 heating degree days and 361 cooling degree days (base 65°F), 11% of the year's total heating and cooling demand.
Questions
How hot is Hilo in August?
The normal high is 83°F and the normal low is 70°F. From 1991 to 2020 the hottest August reading was 90°F (most recently on August 29, 2015).
Does it rain a lot in Hilo in August?
About 27 days in August have at least 0.01 in of precipitation, and the normal total is 11.3 in. The wettest August in 1991-2020 was in 2018 (49.2 in); the driest was in 2008 (3.9 in).
Is August a good time to visit Hilo?
August ranks 8th of 12 months on our comfort score for Hilo (40 out of 100). It has almost no comfortable days. The best months are January and February.
Where the numbers come from
- Temperature, rain, frost dates and humidity and wind by hour: Hilo Intl Airport (USW00021504), 2.2 mi E of the city center, 38 ft . NOAA normals and daily records, 1991-2020.
- Snowfall and snow depth: Kapoho Beach 93.11 (USC00513368), 23 mi SE of the city center, 20 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Hilo International Airport (912850-21504), 2.5 mi E of the city center, 29 ft . Hourly observations, 1991-2020.
- Not available for this location: cloud cover (no station close enough or similar enough in elevation).