Climateby Month

Hilo, HI climate by month

NOAA 1991-2020 normals · 19 ft elevation

Hilo is warm and humid year-round, with normal highs between 78°F in February and 83°F in September. Wet days are spread through the year, from about 16 to 27 a month. The most comfortable time to visit is January and February.

Warmest month
83°F
September normal high
Coldest month
64°F
January normal low
Wet days a year
273
120.4 in of precipitation
Muggy days a year
233
dew point 65°F or higher

How warm is Hilo?

Normal highs range from 78°F in February to 83°F in September.

60°70°80°90° January: normal high 79°F (26°C), low 64°F (18°C) February: normal high 78°F (26°C), low 64°F (18°C) 78° 64° March: normal high 79°F (26°C), low 65°F (18°C) April: normal high 79°F (26°C), low 66°F (19°C) May: normal high 81°F (27°C), low 67°F (19°C) June: normal high 82°F (28°C), low 69°F (21°C) July: normal high 83°F (28°C), low 70°F (21°C) 83° 70° August: normal high 83°F (28°C), low 70°F (21°C) September: normal high 83°F (28°C), low 70°F (21°C) October: normal high 82°F (28°C), low 69°F (21°C) November: normal high 80°F (27°C), low 68°F (20°C) December: normal high 79°F (26°C), low 66°F (19°C) JFMAMJJASOND

Bars run from the normal low to the normal high for each month.

How rainy is Hilo?

August has the most wet days (about 27); the year brings about 120 in of precipitation.

January: 16 wet days 16 February: 17 wet days March: 22 wet days April: 25 wet days May: 23 wet days June: 25 wet days July: 27 wet days August: 27 wet days 27 September: 23 wet days October: 23 wet days November: 23 wet days December: 22 wet days JFMAMJJASOND

Wet day: at least 0.01 in of rain or melted snow, counted from daily records 1991-2020.

How humid is Hilo?

Muggy days peak in August, at about 30 days.

January: 7 muggy days 7 February: 7 muggy days March: 10 muggy days April: 13 muggy days May: 20 muggy days June: 25 muggy days July: 28 muggy days August: 30 muggy days 30 September: 27 muggy days October: 27 muggy days November: 23 muggy days December: 16 muggy days JFMAMJJASOND

Muggy day: daily mean dew point of 65°F or higher, from hourly observations 1991-2020 at Hilo International Airport, 2.5 mi E of the city center.

How much daylight?

Daylight ranges from about 11.0 hours in December to 13.3 hours in June.

January: 11.1 hours of daylight February: 11.5 hours of daylight March: 12.0 hours of daylight April: 12.6 hours of daylight May: 13.1 hours of daylight June: 13.3 hours of daylight 13.3 July: 13.2 hours of daylight August: 12.8 hours of daylight September: 12.3 hours of daylight October: 11.7 hours of daylight November: 11.2 hours of daylight December: 11.0 hours of daylight 11.0 JFMAMJJASOND
See all numbers
Monthly climate normals and day counts for Hilo, 1991-2020
MonthHighLowPrecip.Wet daysMuggy daysDaylight
January 79°F64°F 7.9 in16 7 11.1 h
February 78°F64°F 10.2 in17 7 11.5 h
March 79°F65°F 12.7 in22 10 12.0 h
April 79°F66°F 9.4 in25 13 12.6 h
May 81°F67°F 7.0 in23 20 13.1 h
June 82°F69°F 7.3 in25 25 13.3 h
July 83°F70°F 9.2 in27 28 13.2 h
August 83°F70°F 11.3 in27 30 12.8 h
September 83°F70°F 8.7 in23 27 12.3 h
October 82°F69°F 10.2 in23 27 11.7 h
November 80°F68°F 14.4 in23 23 11.2 h
December 79°F66°F 12.1 in22 16 11.0 h

High and low: NOAA 1991-2020 normal daily high and low. Wet days: at least 0.01 in of rain or melted snow. Muggy days: daily mean dew point 65°F or higher.

Best months to visit Hilo

By our comfort score, the best months are January and February.

Comfort score by month (0-100) and its parts, in days per month
MonthScoreComfortableNotable rainHot or cold
Jan 484100
Feb 495110
Mar 443150
Apr 411170
May 440140
Jun 420170
Jul 400190
Aug 400180
Sep 400151
Oct 380170
Nov 360170
Dec 381160

Score = 40 × share of comfortable days + 25 × share of days without notable rain + 20 × share of days neither hot (90°F+) nor cold (high 40°F or below) + 15 × daylight. How the score works.

Frost dates in Hilo

Hilo is frost-free: NOAA's 1991-2020 normals record no nights at 32°F or below at Hilo Intl Airport.

Station: Hilo Intl Airport (USW00021504), NOAA 1991-2020 freeze probabilities. Frost dates for every city in Hawaii.

Hottest and coldest readings, 1991-2020

The highest reading was 94°F (November 28, 2013); the lowest was 54°F (January 10, 1995).

From the temperature station's daily records with NOAA quality flags removed. Not an all-time record.

Near Hilo

Similar climates elsewhere

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).

Distances from the city center (USGS). Methodology · Report an error