Hilo Weather in September
Average highs run from 83°F on September 1 to 83°F on September 30, and lows from 70°F to 70°F. Normal precipitation for the month is 8.70 in over about 23 wet days.
September day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
September at a glance
- Average high
- 83°F
- Average low
- 70°F
- Precipitation
- 8.70 in
- Record high
- 93°FSep 2, 2015
- Record low
- 61°FSep 30, 1970
- Chance of a freeze
- 0%
- Days of 90°F or more
- 0.7
- Daylight
- 12 h 30 min to 11 h 58 min
- Cloud cover
- 50%
- Humidity
- 82%
- Dew point
- 67°F
- Wind
- 11.2 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 |
|---|---|---|---|---|---|
| Sep 1 | 83°F | 70°F | 92°F 2015 | 65°F 1958 | 82% |
| Sep 2 | 83°F | 70°F | 93°F 2015 | 64°F 1951 | 82% |
| Sep 3 | 83°F | 70°F | 90°F 1987 | 64°F 1960 | 82% |
| Sep 4 | 83°F | 70°F | 89°F 2015 | 64°F 1961 | 81% |
| Sep 5 | 83°F | 70°F | 89°F 2015 | 64°F 1955 | 81% |
| Sep 6 | 83°F | 70°F | 91°F 2015 | 63°F 1955 | 81% |
| Sep 7 | 83°F | 70°F | 90°F 1976 | 64°F 1970 | 81% |
| Sep 8 | 83°F | 70°F | 91°F 2015 | 62°F 1955 | 80% |
| Sep 9 | 83°F | 70°F | 92°F 2015 | 63°F 1955 | 80% |
| Sep 10 | 83°F | 70°F | 90°F 1992 | 62°F 1955 | 80% |
| Sep 11 | 83°F | 70°F | 91°F 1992 | 64°F 1955 | 79% |
| Sep 12 | 83°F | 70°F | 90°F 1977 | 64°F 1955 | 79% |
| Sep 13 | 83°F | 70°F | 88°F 1971 | 65°F 1951 | 79% |
| Sep 14 | 83°F | 70°F | 90°F 1971 | 64°F 1970 | 79% |
| Sep 15 | 83°F | 70°F | 90°F 1972 | 63°F 2009 | 78% |
| Sep 16 | 83°F | 70°F | 89°F 1971 | 63°F 1961 | 78% |
| Sep 17 | 83°F | 70°F | 92°F 2019 | 63°F 1955 | 78% |
| Sep 18 | 83°F | 70°F | 89°F 1974 | 62°F 1955 | 78% |
| Sep 19 | 83°F | 70°F | 90°F 2014 | 64°F 1952 | 77% |
| Sep 20 | 83°F | 70°F | 90°F 1981 | 63°F 1976 | 77% |
| Sep 21 | 83°F | 70°F | 92°F 1951 | 62°F 1959 | 77% |
| Sep 22 | 83°F | 70°F | 90°F 2019 | 65°F 1953 | 77% |
| Sep 23 | 83°F | 70°F | 89°F 1995 | 63°F 2006 | 77% |
| Sep 24 | 83°F | 70°F | 89°F 1995 | 64°F 1952 | 76% |
| Sep 25 | 83°F | 70°F | 90°F 2014 | 64°F 1970 | 76% |
| Sep 26 | 83°F | 70°F | 93°F 2014 | 64°F 1956 | 76% |
| Sep 27 | 83°F | 70°F | 92°F 2019 | 64°F 1950 | 76% |
| Sep 28 | 83°F | 70°F | 90°F 2019 | 64°F 1956 | 76% |
| Sep 29 | 83°F | 70°F | 89°F 1974 | 64°F 1955 | 75% |
| Sep 30 | 83°F | 70°F | 88°F 1976 | 61°F 1970 | 75% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (HST).
- September 1
- sunrise 6:05 AM, sunset 6:35 PM
- September 30
- sunrise 6:11 AM, sunset 6:09 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.