Hilo, HI climate
Hilo has warm winters and pleasant summers, with plenty of rain. A typical July afternoon reaches 83°, a January night drops to 64°, and snow is almost unheard of.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Hilo feels like
Winter
Spring
Summer
Fall
Hilo weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground |
|---|---|---|---|---|---|---|
| January | 79° | 64° | 7.9" | 0 | 16 | 0 |
| February | 78° | 64° | 10.2" | 0 | 17 | 0 |
| March | 79° | 65° | 12.7" | 0 | 23 | 0 |
| April | 79° | 66° | 9.4" | 0 | 26 | 0 |
| May | 81° | 67° | 7.0" | 0 | 23 | 0 |
| June | 82° | 69° | 7.3" | 0 | 26 | 0 |
| July | 83° | 70° | 9.2" | 0 | 27 | 0 |
| August | 83° | 70° | 11.3" | 0 | 27 | 0 |
| September | 83° | 70° | 8.7" | 0 | 24 | 0 |
| October | 82° | 69° | 10.2" | 0 | 24 | 0 |
| November | 80° | 68° | 14.4" | 0 | 24 | 0 |
| December | 79° | 66° | 12.1" | 0 | 21 | 0 |
| Year | 81° | 67° | 120.4" | 0.0" | 277 | 0 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more.
Rain and snow in Hilo
Hilo gets 120 inches of rain and melted snow a year. November is the wettest month and May the driest. Rain or snow falls on about 277 days a year.
A year-round growing season
Heating and cooling a home in Hilo
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Hilo, 0% of that work is heating and 100% is cooling, so air conditioning is the bigger bill.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
How Hilo compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Common questions about Hilo’s climate
What is the coldest month in Hilo?
January, with a typical high of 79° and a low of 64°.
What is the hottest month in Hilo?
September, with a typical high of 83° and a low of 70°. About 2 days a year reach 90°.
How much snow does Hilo get?
Almost none. A normal year brings 0.0 inches.
When is the first frost in Hilo?
Frost is uncommon. Only 0% of years see a night at 32° or below.
What is the rainiest month in Hilo?
November, with 14.4 inches of rain and melted snow. The year totals 120 inches.
NOAA’s gridded normals don’t cover this state, so temperatures and rainfall come from the nearest weather station. Snow, frost dates and day counts come from NOAA’s weather station at Waiakea Scd 88.2, HI (4 mi, snow) and Hilo Intl Airport, HI (3 mi, frost, heat and degree days). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020.