Hilo, Hawaii Weather

Hilo has a tropical rainforest climate , with substantial rainfall throughout the year. Its location on the windward coast (relative to the trade winds), makes it the fourth-wettest city in the United States, behind the southeast Alaskan cities of Whittier, Ketchikan and Yakutat, and one of the wettest in the world. An average of around 126.72 inches (3,220 mm) of rain fell at Hilo International Airport annually between 1981 and 2010, with 272 days of the year receiving some rain. Rainfall in Hilo varies with altitude, with more at higher elevations. At some weather stations in upper Hilo the annual rainfall is above 200 inches (5,100 mm).

Monthly mean temperatures range from 71.2 °F (21.8 °C) in February to 76.4 °F (24.7 °C) in August. The highest recorded temperature was 94 °F (34 °C) on May 20, 1996, and the lowest 53 °F (12 °C) on February 21, 1962. The wettest year was 1994 with 182.81 inches (4,643.4 mm), and the driest was 1983, with 68.09 inches (1,729.5 mm). The most rainfall in one month was 50.82 inches (1,290.8 mm) in December 1954. The most rainfall in 24 hours was 27.24 inches (691.9 mm) on November 2, 2000.

Hilo’s location on the shore of the funnel-shaped Hilo Bay also makes it vulnerable to tsunamis.

Average Temperature
Jan
77 °F
25 °C
Feb
74 °F
24 °C
Mar
73 °F
23 °C
Apr
77 °F
25 °C
May
79 °F
26 °C
Jun
79 °F
26 °C
Jul
81 °F
27 °C
Aug
82 °F
28 °C
Sep
81 °F
27 °C
Oct
81 °F
27 °C
Nov
81 °F
27 °C
Dec
77 °F
25 °C
Humidity
Jan
67%
Feb
70%
Mar
69%
Apr
72%
May
68%
Jun
71%
Jul
70%
Aug
71%
Sep
72%
Oct
72%
Nov
70%
Dec
74%
Rain
Jan
24mm
Feb
152mm
Mar
43mm
Apr
100mm
May
36mm
Jun
135mm
Jul
65mm
Aug
106mm
Sep
69mm
Oct
105mm
Nov
96mm
Dec
106mm
Clouds
Jan
34%
Feb
41%
Mar
59%
Apr
53%
May
50%
Jun
60%
Jul
52%
Aug
64%
Sep
64%
Oct
62%
Nov
53%
Dec
65%
Air quality US AQI
Jan
25
Feb
33
Mar
27
Apr
26
May
25
Jun
23
Jul
22
Aug
19
Sep
18
Oct
17
Nov
17
Dec
17
Sun
Jan
7UVI
Feb
8UVI
Mar
9UVI
Apr
9UVI
May
10UVI
Jun
9UVI
Jul
9UVI
Aug
9UVI
Sep
8UVI
Oct
7UVI
Nov
6UVI
Dec
5UVI