Weather on August 21 at Haleakala
Haleakala National Park
Based on 55 years of data from Kahului, HI
Elevation Note: Haleakala sits at 7,000 ft. Expect temperatures 25°F cooler than the data shown below, which comes from Kahului, HI at a lower elevation.
Planning Your Visit
August 21st in Haleakala National Park (via Kahului, HI) typically brings warm summer weather, with average highs around 88°F and lows near 72°F. Over 55 years of records, the warmest August 21st was in 2017 (84°F average), while the coldest was 2005 (74°F) — a 10°F range across recorded history. Rain or other precipitation has occurred on about 22% of August 21st dates historically, with the wettest August 21st recording 2.03" of rain. The last decade has been 1.8°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.8°F warmer on this date compared to 20-30 years ago.
Planning for August 21st in Haleakala? Stay hydrated and seek shade during peak afternoon hours.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 89°F | 74°F | 0" | -- |
| 2024 | 86°F | 73°F | 0" | -- |
| 2023 | 88°F | 72°F | 0" | -- |
| 2022 | 90°F | 76°F | 0.03" | -- |
| 2021 | 88°F | 74°F | 0" | -- |
| 2020 | 90°F | 78°F | 0" | -- |
| 2019 | 90°F | 77°F | 0" | -- |
| 2018 | 87°F | 74°F | 0.05" | -- |
| 2017 | 92°F | 76°F | 0" | -- |
| 2016 | 88°F | 69°F | 0" | -- |
| 2015 | 94°F | 72°F | 0" | -- |
| 2014 | 91°F | 73°F | 0.25" | -- |
| 2013 | 92°F | 68°F | 0" | 0" |
| 2012 | 86°F | 73°F | 0" | -- |
| 2011 | 86°F | 71°F | 0" | -- |
| 2010 | 88°F | 74°F | 0" | -- |
| 2009 | 87°F | 73°F | 0" | -- |
| 2008 | 86°F | 72°F | 0.33" | -- |
| 2007 | 89°F | 71°F | 0" | -- |
| 2006 | 88°F | 75°F | 0" | -- |
| 2005 | 87°F | 61°F | 0" | -- |
| 2004 | 90°F | 70°F | 0" | -- |
| 2003 | 91°F | 75°F | 0.03" | -- |
| 2002 | 87°F | 73°F | 0" | -- |
| 2001 | 87°F | 72°F | 0" | -- |
| 2000 | 88°F | 75°F | 0" | -- |
| 1999 | 89°F | 70°F | 0" | -- |
| 1998 | 87°F | 74°F | 0" | -- |
| 1997 | 89°F | 70°F | 0.05" | 0" |
| 1996 | 88°F | 74°F | 0" | 0" |
| 1995 | 90°F | 75°F | 0" | 0" |
| 1994 | 92°F | 71°F | 0" | 0" |
| 1993 | 90°F | 75°F | 0.03" | 0" |
| 1992 | 85°F | 74°F | 0" | 0" |
| 1991 | 86°F | 66°F | 0" | 0" |
| 1990 | 89°F | 73°F | 0" | 0" |
| 1989 | 84°F | 71°F | 0.05" | 0" |
| 1988 | 85°F | 70°F | 0.23" | 0" |
| 1987 | 91°F | 68°F | 0" | 0" |
| 1986 | 92°F | 74°F | 0" | 0" |
| 1985 | 87°F | 71°F | 0.08" | 0" |
| 1984 | 90°F | 66°F | 0" | 0" |
| 1983 | 90°F | 68°F | 0" | 0" |
| 1982 | 93°F | 73°F | 0" | 0" |
| 1981 | 90°F | 73°F | 0" | 0" |
| 1980 | 89°F | 71°F | 0" | 0" |
| 1979 | 91°F | 68°F | 0" | 0" |
| 1978 | 89°F | 74°F | 2.03" | 0" |
| 1977 | 89°F | 67°F | 0" | 0" |
| 1976 | 87°F | 70°F | 0" | 0" |
| 1975 | 81°F | 70°F | 0" | 0" |
| 1974 | 83°F | 71°F | 0.03" | 0" |
| 1973 | 85°F | 72°F | 0" | 0" |
| 1972 | 84°F | 70°F | -- | 0" |
| 1971 | 88°F | 70°F | 0" | 0" |