Hilo weather by month & the best time to visit
United States · beach resort · tropical rainforest climate
The best time to visit Hilo is June — its sunniest month (Sunshine Score 71/100), with January and February close behind. Hilo averages about 2,716 hours of sunshine a year. Daytime highs around 27°C / 81°F and roughly 132 mm of rain in June.
When is the best time to visit Hilo?
For sunshine, the best time to visit Hilo is June, then January and February. The dullest month is January (67/100, 192 mm of rain). The full month-by-month picture is in the table below.
How sunny is Hilo?
Hilo gets a lot of sun: around 2,716 hours a year. Conditions barely change through the year — only 4 Sunshine Score points separate June from January. It ranks #135 of 580 destinations in United States for annual sunshine, above the national median of 2,279 hours. The year's 2,301 mm of rain spreads fairly evenly across the months, with no pronounced dry season.
Sunshine Score by month
| Month | Score | Day high | Night low | Rain | UV | Sea |
|---|---|---|---|---|---|---|
| January | 67 | 25° / 77°F | 21° / 70°F | 192 mm | 6 | 25° / 77°F |
| February | 67 | 25° / 77°F | 21° / 70°F | 183 mm | 7 | 24° / 75°F |
| March | 67 | 25° / 77°F | 21° / 70°F | 272 mm | 8 | 24° / 75°F |
| April | 67 | 25° / 77°F | 22° / 72°F | 241 mm | 9 | 24° / 75°F |
| May | 67 | 26° / 79°F | 22° / 72°F | 175 mm | 9 | 24° / 75°F |
| June | 71 | 27° / 81°F | 23° / 73°F | 132 mm | 9 | 25° / 77°F |
| July | 67 | 27° / 81°F | 23° / 73°F | 152 mm | 10 | 26° / 79°F |
| August | 67 | 28° / 82°F | 24° / 75°F | 168 mm | 10 | 27° / 81°F |
| September | 67 | 28° / 82°F | 24° / 75°F | 166 mm | 9 | 27° / 81°F |
| October | 67 | 27° / 81°F | 24° / 75°F | 184 mm | 8 | 27° / 81°F |
| November | 67 | 26° / 79°F | 23° / 73°F | 216 mm | 6 | 26° / 79°F |
| December | 67 | 25° / 77°F | 22° / 72°F | 220 mm | 6 | 26° / 79°F |
Sea temperature in Hilo by month
The sea off Hilo is warmest in August at around 27°C / 81°F, and coolest in February at 24°C / 75°F. The water sits at a comfortable 21°C or warmer roughly all year round. Month-by-month sea-surface temperatures are in the Sea column of the table above.
Nearest destinations
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Head-to-head
How Hilo compares month by month: Hilo vs Honolulu · Hilo vs Kahului · Hilo vs Kailua-Kona · all comparisons
Hilo: questions and answers
What kind of destination is Hilo?
Hilo is a beach resort in United States with a tropical rainforest climate — the sea reaches 27°C at its warmest and is swimmable (21°C+) year-round.
How many hours of sunshine does Hilo get a year?
Hilo gets about 2,716 hours of sunshine a year, at its best around June.
When is the best time to visit Hilo?
The sunniest time to visit Hilo is June, when the Sunshine Score peaks at 71/100 (with January and February close behind). Expect daytime highs around 27°C / 81°F.
What is the least sunny month in Hilo?
January is the least sunny month in Hilo, scoring 67/100 with about 192 mm of rain.
What is the sea temperature in Hilo?
The sea in Hilo ranges from about 24°C (February) to 27°C (August). Month-by-month sea temperatures are on this page.
How strong is the sun in Hilo?
The typical midday UV index in Hilo peaks around 10 (very high) in July, easing to about 6 (high) in January. Month-by-month midday UV values are in the UV column of the table on this page.
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