Hilo Weather in May
Average highs run from 80°F on May 1 to 81°F on May 31, and lows from 67°F to 68°F. Normal precipitation for the month is 6.99 in over about 23 wet days.
May day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
May at a glance
- Average high
- 81°F
- Average low
- 67°F
- Precipitation
- 6.99 in
- Record high
- 94°FMay 20, 1966
- Record low
- 58°FMay 23, 2024
- Chance of a freeze
- 0%
- Daylight
- 12 h 53 min to 13 h 14 min
- Cloud cover
- 54%
- Humidity
- 81%
- Dew point
- 64°F
- Wind
- 11.4 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| May 1 | 80°F | 67°F | 85°F 1980 | 62°F 1960 | 79% |
| May 2 | 80°F | 67°F | 85°F 2004 | 61°F 1979 | 78% |
| May 3 | 80°F | 67°F | 85°F 1977 | 61°F 1977 | 78% |
| May 4 | 80°F | 67°F | 86°F 2019 | 61°F 2006 | 78% |
| May 5 | 80°F | 67°F | 87°F 1995 | 60°F 1971 | 77% |
| May 6 | 80°F | 67°F | 86°F 1980 | 61°F 1956 | 77% |
| May 7 | 80°F | 67°F | 87°F 2016 | 62°F 1950 | 77% |
| May 8 | 80°F | 67°F | 87°F 1966 | 59°F 1992 | 77% |
| May 9 | 80°F | 67°F | 89°F 1966 | 60°F 1971 | 76% |
| May 10 | 80°F | 67°F | 85°F 1965 | 59°F 1971 | 76% |
| May 11 | 81°F | 67°F | 87°F 2004 | 60°F 2006 | 76% |
| May 12 | 81°F | 67°F | 85°F 1967 | 62°F 1971 | 76% |
| May 13 | 81°F | 67°F | 87°F 2020 | 62°F 2006 | 76% |
| May 14 | 81°F | 67°F | 88°F 2020 | 62°F 1957 | 76% |
| May 15 | 81°F | 67°F | 87°F 2020 | 63°F 1955 | 75% |
| May 16 | 81°F | 67°F | 87°F 1980 | 63°F 1964 | 75% |
| May 17 | 81°F | 67°F | 88°F 2020 | 61°F 1987 | 75% |
| May 18 | 81°F | 67°F | 91°F 1967 | 61°F 1985 | 76% |
| May 19 | 81°F | 67°F | 87°F 1967 | 62°F 1952 | 76% |
| May 20 | 81°F | 68°F | 94°F 1966 | 59°F 1952 | 76% |
| May 21 | 81°F | 68°F | 88°F 1966 | 62°F 1957 | 76% |
| May 22 | 81°F | 68°F | 88°F 2019 | 63°F 1956 | 76% |
| May 23 | 81°F | 68°F | 88°F 1966 | 58°F 2024 | 76% |
| May 24 | 81°F | 68°F | 87°F 1968 | 63°F 1970 | 76% |
| May 25 | 81°F | 68°F | 91°F 2003 | 60°F 2003 | 77% |
| May 26 | 81°F | 68°F | 88°F 2003 | 60°F 2003 | 77% |
| May 27 | 81°F | 68°F | 88°F 1992 | 61°F 2003 | 77% |
| May 28 | 81°F | 68°F | 87°F 1980 | 62°F 1972 | 78% |
| May 29 | 81°F | 68°F | 89°F 1992 | 64°F 1950 | 78% |
| May 30 | 81°F | 68°F | 87°F 1967 | 62°F 1964 | 78% |
| May 31 | 81°F | 68°F | 88°F 2007 | 63°F 1951 | 79% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (HST).
- May 1
- sunrise 5:51 AM, sunset 6:44 PM
- May 31
- sunrise 5:41 AM, sunset 6:55 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00021504 (Hilo Intl AP), public domain. Records: NOAA GHCN-Daily, station USW00021504, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.