Weather on September 21
Honolulu, HI
55 Years of Data
About This Date
September 21st in Honolulu, HI typically brings warm fall weather, with average highs around 86°F and lows near 71°F. Over 53 years of records, the warmest September 21st was in 2014 (82°F average), while the coldest was 2003 (72°F) — a 10°F range across recorded history. Rain or other precipitation has occurred on about 21% of September 21st dates historically, with the wettest September 21st recording 0.76" of rain. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for September 21st in Honolulu, HI? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 86° | 76° | 81° | — | — |
| 2025 | 89° | 75° | 82° | — | — |
| 2024 | 84° | 68° | 76° | — | — |
| 2023 | 84° | 67° | 75° | — | — |
| 2022 | 82° | 71° | 77° | — | — |
| 2021 | 83° | 69° | 76° | — | — |
| 2020 | 81° | 69° | 75° | — | — |
| 2019 | 86° | 70° | 78° | — | — |
| 2018 | 82° | 70° | 76° | — | — |
| 2017 | 87° | 69° | 78° | — | — |
| 2016 | 84° | 67° | 75° | — | — |
| 2015 | 88° | 76° | 82° | — | — |
| 2014warmest | 89° | 75° | 82° | — | — |
| 2013 | 85° | 71° | 78° | — | — |
| 2012 | 81° | 65° | 73° | — | — |
| 2011 | 88° | 71° | 79° | — | — |
| 2010 | 86° | 72° | 79° | — | — |
| 2009 | 88° | 74° | 81° | — | — |
| 2008 | 86° | 72° | 79° | 0.07" | — |
| 2007 | 85° | 72° | 78° | — | — |
| 2005 | 88° | 70° | 79° | — | — |
| 2004 | 85° | 75° | 80° | 0.39" | — |
| 2003coldest | 80° | 64° | 72° | — | — |
| 2002 | 84° | 71° | 78° | 0.03" | — |
| 2001 | 87° | 71° | 79° | — | — |
| 2000 | 86° | 68° | 77° | — | — |
| 1999 | 86° | 70° | 78° | — | — |
| 1998 | 85° | 70° | 77° | — | — |
| 1997 | 85° | 71° | 78° | — | — |
| 1996 | 88° | 73° | 80° | — | — |
| 1995 | 83° | 75° | 79° | 0.09" | — |
| 1994 | 87° | 74° | 80° | — | — |
| 1993 | 88° | 71° | 79° | — | — |
| 1992 | 90° | 73° | 81° | — | — |
| 1991 | 88° | 72° | 80° | — | — |
| 1990 | 88° | 73° | 80° | — | — |
| 1989 | 87° | 67° | 77° | — | — |
| 1988 | 88° | 70° | 79° | 0.03" | — |
| 1987 | 85° | 71° | 78° | 0.11" | — |
| 1986 | 90° | 72° | 81° | — | — |
| 1985 | 86° | 69° | 78° | — | — |
| 1984 | 86° | 74° | 80° | — | — |
| 1983 | 84° | 69° | 77° | — | — |
| 1982 | 86° | 68° | 77° | — | — |
| 1981 | 93° | 66° | 80° | 0.76" | — |
| 1978 | 84° | 72° | 78° | 0.01" | — |
| 1977 | 84° | 78° | 81° | — | — |
| 1976 | 88° | 73° | 80° | 0.1" | — |
| 1975 | 88° | 73° | 80° | — | — |
| 1974 | 86° | 71° | 79° | — | — |
| 1973 | 88° | — | — | 0.01" | — |
| 1972 | 86° | 69° | 78° | — | — |
| 1971 | 84° | 74° | 79° | 0.43" | — |
Honolulu, HI Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Honolulu, HI Monthly Precipitation
Average rainfall per month, in inches.
Honolulu, HI Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
Best Time to Visit Honolulu, HI
Most pleasant months in Honolulu, HI: January, February, March, April, December.