Annual mean 20°C · wettest around December · prevailing wind NE
Warmest
25.0 °C
Coldest
21.6 °C
Wettest
25%
Windiest
3.6 m/s
Prevailing
NE
3.3 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
never good
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in Hilo over the whole year is 20°C. September is the hottest month, with highs of about 25°C; February is the coldest, with lows of about 16°C. Hilo has no sharply defined rainy season: the chance of rain on a given day runs from 16% in January, the driest month, to 24% in December, the wettest. Winds in Hilo are highest in February, averaging 2.5 m/s (9 km/h), and lightest in September, at 2.0 m/s (7 km/h). The prevailing wind is from the NE. The clearest skies in Hilo come in January, when the sky is typically 48% covered; May is the cloudiest month, at 63%.
Month by month Hilo climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
23°C
16°C
24°C
16%
48%
2.3 m/s
65
58
28
February
22°C
16°C
23°C
22%
56%
2.5 m/s
68
45
37
March
22°C
16°C
23°C
22%
60%
2.4 m/s
70
48
33
April
23°C
17°C
24°C
24%
60%
2.3 m/s
69
54
27
May
23°C
18°C
25°C
21%
63%
2.3 m/s
62
58
24
June
24°C
18°C
26°C
18%
60%
2.4 m/s
49
60
20
July
25°C
19°C
27°C
21%
60%
2.4 m/s
37
60
19
August
25°C
19°C
27°C
22%
59%
2.3 m/s
32
61
18
September
25°C
19°C
28°C
20%
54%
2.0 m/s
29
61
19
October
25°C
18°C
27°C
22%
52%
2.0 m/s
32
62
19
November
23°C
18°C
25°C
23%
53%
2.2 m/s
48
58
22
December
22°C
17°C
24°C
24%
54%
2.2 m/s
59
54
27
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Hilo weather by season
Year round, Hilo has days of about 22°C at their warmest in February, its coolest month, and 25°C in September, its warmest; the coolest hours of the day run from 16°C to 19°C through the year, and the average temperature over the year is 20°C around the clock. Rain is most likely around December and least likely around January. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Hilo weather in winterDecember to February
High 22°CLow 16°CRain 21%
Winter in Hilo has typical daily highs of about 22°C and lows of about 16°C, with a 21% chance of rain on a given day.
Hilo weather in springMarch to May
High 23°CLow 17°CRain 22%
Spring in Hilo has typical daily highs of about 23°C and lows of about 17°C, with a 22% chance of rain on a given day.
Hilo weather in summerJune to August
High 25°CLow 19°CRain 20%
Summer in Hilo has typical daily highs of about 25°C and lows of about 19°C, with a 20% chance of rain on a given day.
Hilo weather in autumnSeptember to November
High 24°CLow 18°CRain 22%
Autumn in Hilo has typical daily highs of about 24°C and lows of about 18°C, with a 22% chance of rain on a given day.
When is the rainy season in Hilo?
Hilo has no sharply defined rainy season: the chance of rain on a given day runs from 16% in January, the driest month, to 24% in December, the wettest.
What time of year is Hilo windiest?
Winds in Hilo are highest in February, averaging 2.5 m/s (9 km/h), and lightest in September, at 2.0 m/s (7 km/h). The prevailing wind is from the NE.
What is the average temperature in Hilo year round?
The average temperature in Hilo over the whole year is 20°C. September is the hottest month, with highs of about 25°C; February is the coldest, with lows of about 16°C.