Weather on August 21
Honolulu, HI
55 Years of Data
Avg High
86°F
Avg Low
71°F
Warmest
2003
84°F avg
Coldest
2006
74°F avg
About This Date
August 21st in Honolulu, HI typically brings warm summer weather, with average highs around 86°F and lows near 71°F. Over 52 years of records, the warmest August 21st was in 2003 (84°F average), while the coldest was 2006 (74°F) — a 10°F range across recorded history. Rain or other precipitation has occurred on about 17% of August 21st dates historically, with the wettest August 21st recording 1.3" of rain. The last decade has been 2.9°F cooler on this date compared to 20-30 years ago.
The last decade has been 2.9°F cooler on this date compared to 20-30 years ago.
Planning for August 21st in Honolulu, HI? Stay hydrated and seek shade during peak afternoon hours.
Cooling Trend
0.6°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 87° | 73° | 80° | — | — |
| 2024 | 83° | 69° | 76° | — | — |
| 2023 | 82° | 68° | 75° | — | — |
| 2022 | 84° | 68° | 76° | — | — |
| 2021 | 87° | 68° | 78° | — | — |
| 2020 | 80° | 69° | 75° | — | — |
| 2019 | 84° | 70° | 77° | — | — |
| 2018 | 84° | 69° | 77° | — | — |
| 2017 | 84° | 69° | 77° | — | — |
| 2016 | 86° | 68° | 77° | — | — |
| 2015 | 90° | 76° | 83° | — | — |
| 2014 | 86° | 69° | 78° | — | — |
| 2013 | 85° | 66° | 75° | — | — |
| 2012 | 84° | 64° | 74° | — | — |
| 2011 | 89° | 74° | 81° | — | — |
| 2010 | 88° | 70° | 79° | — | — |
| 2009 | 89° | 74° | 81° | — | — |
| 2008 | 88° | 72° | 80° | — | — |
| 2007 | 86° | 73° | 80° | — | — |
| 2006coldest | 82° | 66° | 74° | — | — |
| 2005 | 85° | 71° | 78° | — | — |
| 2004 | 88° | 75° | 81° | — | — |
| 2003warmest | 89° | 78° | 84° | — | — |
| 2002 | 88° | 70° | 79° | — | — |
| 2001 | 86° | 71° | 79° | — | — |
| 2000 | 87° | 70° | 78° | — | — |
| 1998 | 86° | 72° | 79° | — | — |
| 1997 | 84° | 74° | 79° | 0.25" | — |
| 1996 | 88° | 72° | 80° | — | — |
| 1995 | 87° | 71° | 79° | — | — |
| 1994 | 88° | 76° | 82° | — | — |
| 1993 | 89° | 74° | 81° | — | — |
| 1992 | 89° | 69° | 79° | — | — |
| 1991 | 87° | 71° | 79° | — | — |
| 1990 | 89° | 72° | 80° | 0.03" | — |
| 1989 | 84° | 71° | 78° | 0.1" | — |
| 1988 | 86° | 69° | 78° | — | — |
| 1987 | 87° | 70° | 78° | — | — |
| 1986 | 87° | 73° | 80° | — | — |
| 1985 | 88° | 74° | 81° | — | — |
| 1984 | 86° | 74° | 80° | — | — |
| 1983 | 84° | 70° | 77° | — | — |
| 1982 | 82° | 75° | 79° | 1.3" | — |
| 1981 | 94° | 66° | 80° | — | — |
| 1978 | 84° | 70° | 77° | 0.1" | — |
| 1977 | 90° | 77° | 83° | — | — |
| 1976 | 84° | 76° | 80° | 0.05" | — |
| 1975 | 84° | 74° | 79° | 0.2" | — |
| 1974 | 87° | 75° | 81° | — | — |
| 1973 | 85° | 72° | 78° | 0.2" | — |
| 1972 | 86° | 71° | 79° | — | — |
| 1971 | 93° | 73° | 83° | 0.13" | — |
52 years of data from FRENCH FRIGATE SHOALS