Kauai County Weather in September
Average highs run from 87°F on September 1 to 87°F on September 30, and lows from 73°F to 72°F. Normal precipitation for the month is 0.78 in over about 6 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
- 87°F
- Average low
- 72°F
- Precipitation
- 0.78 in
- Record high
- 93°FSep 26, 2015
- Record low
- 64°FSep 7, 1975
- Chance of a freeze
- 0%
- Days of 90°F or more
- 2.1
- Daylight
- 12 h 33 min to 11 h 57 min
- Cloud cover
- 46%
- Humidity
- 76%
- Dew point
- 71°F
- Wind
- 13.9 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 | 87°F | 73°F | 91°F 2015 | 67°F 1975 | 13% |
| Sep 2 | 87°F | 73°F | 92°F 1984 | 68°F 1973 | 13% |
| Sep 3 | 87°F | 73°F | 90°F 1987 | 68°F 1970 | 14% |
| Sep 4 | 87°F | 73°F | 92°F 1993 | 67°F 1975 | 14% |
| Sep 5 | 87°F | 73°F | 90°F 1988 | 68°F 1973 | 14% |
| Sep 6 | 87°F | 72°F | 90°F 2005 | 66°F 1975 | 14% |
| Sep 7 | 87°F | 72°F | 91°F 2015 | 64°F 1975 | 15% |
| Sep 8 | 87°F | 72°F | 91°F 2015 | 65°F 1989 | 15% |
| Sep 9 | 87°F | 72°F | 90°F 1992 | 68°F 1973 | 15% |
| Sep 10 | 87°F | 72°F | 91°F 1991 | 67°F 1990 | 16% |
| Sep 11 | 87°F | 72°F | 91°F 2004 | 65°F 1975 | 16% |
| Sep 12 | 87°F | 72°F | 90°F 1994 | 68°F 1971 | 16% |
| Sep 13 | 87°F | 72°F | 91°F 2015 | 67°F 1973 | 17% |
| Sep 14 | 87°F | 72°F | 90°F 1986 | 68°F 1970 | 17% |
| Sep 15 | 87°F | 72°F | 90°F 1993 | 67°F 1973 | 18% |
| Sep 16 | 87°F | 72°F | 92°F 2004 | 66°F 2002 | 18% |
| Sep 17 | 87°F | 72°F | 90°F 2004 | 67°F 1973 | 18% |
| Sep 18 | 87°F | 72°F | 90°F 1991 | 67°F 1983 | 19% |
| Sep 19 | 87°F | 72°F | 92°F 1994 | 67°F 1970 | 19% |
| Sep 20 | 87°F | 72°F | 89°F 1993 | 68°F 1970 | 19% |
| Sep 21 | 87°F | 72°F | 90°F 1986 | 67°F 1975 | 20% |
| Sep 22 | 87°F | 72°F | 90°F 1986 | 66°F 1975 | 20% |
| Sep 23 | 87°F | 72°F | 89°F 1985 | 67°F 1969 | 20% |
| Sep 24 | 87°F | 72°F | 91°F 1984 | 67°F 1975 | 20% |
| Sep 25 | 87°F | 72°F | 90°F 1984 | 67°F 1969 | 20% |
| Sep 26 | 87°F | 72°F | 93°F 2015 | 66°F 1975 | 21% |
| Sep 27 | 87°F | 72°F | 91°F 1986 | 67°F 1989 | 21% |
| Sep 28 | 87°F | 72°F | 89°F 1984 | 66°F 1990 | 21% |
| Sep 29 | 87°F | 72°F | 90°F 1995 | 66°F 1998 | 21% |
| Sep 30 | 87°F | 72°F | 93°F 2015 | 64°F 1975 | 21% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (HST).
- September 1
- sunrise 6:22 AM, sunset 6:55 PM
- September 30
- sunrise 6:30 AM, sunset 6:27 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00022501 (Barking Sands), public domain. Records: NOAA GHCN-Daily, station USW00022501, 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.