Weather on September 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
September 21st in Haleakala National Park (via Kahului, HI) typically brings warm fall weather, with average highs around 88°F and lows near 71°F. Over 55 years of records, the warmest September 21st was in 2015 (85°F average), while the coldest was 1975 (72°F) — a 13°F range across recorded history. Rain or other precipitation has occurred on about 11% of September 21st dates historically, with the wettest September 21st recording 1.57" of rain. The last decade has been 3.2°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.2°F warmer on this date compared to 20-30 years ago.
Planning for September 21st in Haleakala? Stay hydrated and seek shade during peak afternoon hours.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 89°F | 76°F | 0" | -- |
| 2024 | 89°F | 74°F | 0" | -- |
| 2023 | 88°F | 73°F | 0.05" | -- |
| 2022 | 90°F | 76°F | 0" | -- |
| 2021 | 88°F | 73°F | 0" | -- |
| 2020 | 93°F | 77°F | 0" | -- |
| 2019 | 90°F | 72°F | 0.41" | -- |
| 2018 | 93°F | 70°F | 0" | -- |
| 2017 | 90°F | 76°F | 0" | -- |
| 2016 | 85°F | 73°F | 0" | -- |
| 2015 | 92°F | 78°F | 0" | -- |
| 2014 | 93°F | 73°F | 0" | -- |
| 2013 | 86°F | 72°F | 0" | 0" |
| 2012 | 89°F | 67°F | 0" | -- |
| 2011 | 87°F | 72°F | 0.05" | -- |
| 2010 | 82°F | 65°F | 0.03" | -- |
| 2009 | 86°F | 69°F | 0" | -- |
| 2008 | 86°F | 68°F | 0" | -- |
| 2007 | 87°F | 72°F | 0" | -- |
| 2006 | 90°F | 72°F | 0" | -- |
| 2005 | 85°F | 72°F | 0" | -- |
| 2004 | 91°F | 68°F | 0" | -- |
| 2003 | 88°F | 68°F | 0" | -- |
| 2002 | 88°F | 64°F | 0" | -- |
| 2001 | 87°F | 73°F | 0" | -- |
| 2000 | 86°F | 67°F | 0" | -- |
| 1999 | 86°F | 70°F | 0" | -- |
| 1998 | 86°F | 72°F | 0" | -- |
| 1997 | 90°F | 67°F | 0" | 0" |
| 1996 | 89°F | 71°F | 0" | 0" |
| 1995 | 89°F | 68°F | 0" | 0" |
| 1994 | 88°F | 70°F | 0" | 0" |
| 1993 | 88°F | 65°F | 0" | 0" |
| 1992 | 86°F | 72°F | 0" | 0" |
| 1991 | 88°F | 68°F | 0" | 0" |
| 1990 | 92°F | 74°F | 0" | 0" |
| 1989 | 87°F | 71°F | 0.05" | 0" |
| 1988 | 88°F | 73°F | 0" | 0" |
| 1987 | 86°F | 66°F | 1.57" | 0" |
| 1986 | 90°F | 69°F | 0" | 0" |
| 1985 | 86°F | 65°F | 0" | 0" |
| 1984 | 87°F | 65°F | 0" | 0" |
| 1983 | 88°F | 65°F | 0" | 0" |
| 1982 | 90°F | 67°F | 0" | 0" |
| 1981 | 92°F | 71°F | 0" | 0" |
| 1980 | 89°F | 78°F | 0" | 0" |
| 1979 | 91°F | 64°F | 0" | 0" |
| 1978 | 88°F | 74°F | 0" | 0" |
| 1977 | 85°F | 74°F | 0" | 0" |
| 1976 | 82°F | 73°F | 0" | 0" |
| 1975 | 84°F | 61°F | 0" | 0" |
| 1974 | 89°F | 66°F | 0" | 0" |
| 1973 | 84°F | 74°F | 0" | 0" |
| 1972 | 83°F | 72°F | 0" | 0" |
| 1971 | 83°F | 74°F | 0" | 0" |