Weather on May 21 at Haleakala
Haleakala National Park
Based on 56 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
May 21st in Haleakala National Park (via Kahului, HI) typically brings warm spring weather, with average highs around 85°F and lows near 68°F. Over 56 years of records, the warmest May 21st was in 1996 (82°F average), while the coldest was 1985 (70°F) — a 12°F range across recorded history. Rain or other precipitation has occurred on about 18% of May 21st dates historically, with the wettest May 21st recording 1.85" 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 May 21st in Haleakala? Stay hydrated and seek shade during peak afternoon hours.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2026 | 83°F | 71°F | 0" | -- |
| 2025 | 86°F | 71°F | 0" | -- |
| 2024 | 86°F | 66°F | 0" | -- |
| 2023 | 88°F | 69°F | 0" | -- |
| 2022 | 89°F | 70°F | 0" | -- |
| 2021 | 82°F | 65°F | 0" | -- |
| 2020 | 89°F | 74°F | 0" | -- |
| 2019 | 92°F | 70°F | 0" | -- |
| 2018 | 82°F | 70°F | 0" | -- |
| 2017 | 85°F | 64°F | 0" | -- |
| 2016 | 86°F | 71°F | 0.05" | -- |
| 2015 | 84°F | 62°F | 0" | -- |
| 2014 | 84°F | 64°F | 0" | -- |
| 2013 | 85°F | 65°F | 0" | -- |
| 2012 | 87°F | 63°F | 0" | -- |
| 2011 | 85°F | 71°F | 0.03" | -- |
| 2010 | 83°F | 69°F | 0" | -- |
| 2009 | 82°F | 68°F | 0" | -- |
| 2008 | 88°F | 65°F | 0" | -- |
| 2007 | 89°F | 67°F | 0" | -- |
| 2006 | 81°F | 67°F | 0.05" | -- |
| 2005 | 85°F | 70°F | 0.03" | -- |
| 2004 | 89°F | 70°F | 0" | -- |
| 2003 | 85°F | 63°F | 0" | -- |
| 2002 | 86°F | 65°F | 0" | -- |
| 2001 | 84°F | 64°F | 0" | -- |
| 2000 | 88°F | 70°F | 0" | -- |
| 1999 | 87°F | 65°F | 0" | -- |
| 1998 | 83°F | 70°F | 0" | -- |
| 1997 | 85°F | 63°F | 0" | 0" |
| 1996 | 92°F | 72°F | 0" | 0" |
| 1995 | 86°F | 62°F | 0" | 0" |
| 1994 | 84°F | 68°F | 0" | 0" |
| 1993 | 81°F | 70°F | 0" | 0" |
| 1992 | 88°F | 72°F | 0" | 0" |
| 1991 | 86°F | 67°F | 0.03" | 0" |
| 1990 | 83°F | 70°F | 0" | 0" |
| 1989 | 85°F | 67°F | 0" | 0" |
| 1988 | 85°F | 70°F | 0.03" | 0" |
| 1987 | 80°F | 69°F | 0.03" | 0" |
| 1986 | 85°F | 65°F | 0" | 0" |
| 1985 | 76°F | 65°F | 0" | 0" |
| 1984 | 86°F | 74°F | 0" | 0" |
| 1983 | 73°F | 68°F | 1.85" | 0" |
| 1982 | 84°F | 70°F | 0.03" | 0" |
| 1981 | 88°F | 65°F | 0" | 0" |
| 1980 | 87°F | 72°F | 0" | 0" |
| 1979 | 83°F | 67°F | 0" | 0" |
| 1978 | 89°F | 71°F | 0.56" | 0" |
| 1977 | 82°F | 70°F | 0" | 0" |
| 1976 | 79°F | 68°F | 0" | 0" |
| 1975 | 78°F | 68°F | 0" | 0" |
| 1974 | 81°F | 71°F | 0" | 0" |
| 1973 | 78°F | 66°F | -- | 0" |
| 1972 | 86°F | 63°F | 0" | 0" |
| 1971 | 81°F | 70°F | 0" | 0" |