Weather on May 21 at Hawaii Volcanoes
Hawaii Volcanoes National Park
Based on 55 years of data from Hilo, HI
Elevation Note: Hawaii Volcanoes sits at 4,000 ft. Expect temperatures 14°F cooler than the data shown below, which comes from Hilo, HI at a lower elevation.
Planning Your Visit
May 21st in Hawaii Volcanoes National Park (via Hilo, HI) typically brings warm spring weather, with average highs around 82°F and lows near 67°F. Over 55 years of records, the warmest May 21st was in 1992 (78°F average), while the coldest was 1985 (69°F) — a 9°F range across recorded history. Rain or other precipitation has occurred on about 76% of May 21st dates historically, with the wettest May 21st recording 2.03" 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 Hawaii Volcanoes? Stay hydrated and seek shade during peak afternoon hours. Consider bringing rain gear or an umbrella.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 83°F | 67°F | 0" | -- |
| 2024 | 81°F | 68°F | 0.89" | -- |
| 2023 | 83°F | 70°F | 0.2" | -- |
| 2022 | 81°F | 72°F | 0" | -- |
| 2021 | 75°F | 66°F | 1.32" | -- |
| 2020 | 85°F | 70°F | 0.64" | -- |
| 2019 | 83°F | 71°F | 0.51" | -- |
| 2018 | 82°F | 69°F | 0.03" | -- |
| 2017 | 83°F | 67°F | 0.08" | -- |
| 2016 | 83°F | 69°F | 0.94" | -- |
| 2015 | 83°F | 65°F | 0" | -- |
| 2014 | 85°F | 66°F | 0.13" | -- |
| 2013 | 83°F | 64°F | 0" | -- |
| 2012 | 82°F | 66°F | 0" | -- |
| 2011 | 82°F | 65°F | 0.48" | -- |
| 2010 | 82°F | 69°F | 0.43" | -- |
| 2009 | 82°F | 66°F | 0.03" | -- |
| 2008 | 83°F | 66°F | 0" | -- |
| 2007 | 84°F | 69°F | 0" | -- |
| 2006 | 77°F | 64°F | 0.81" | -- |
| 2005 | 87°F | 68°F | 0" | -- |
| 2004 | 85°F | 69°F | 0.33" | -- |
| 2003 | 82°F | 64°F | 0.3" | -- |
| 2002 | 82°F | 69°F | 0" | -- |
| 2001 | 81°F | 64°F | 0.03" | -- |
| 2000 | 82°F | 65°F | 0.3" | -- |
| 1999 | 82°F | 68°F | 0.03" | -- |
| 1998 | 80°F | 67°F | 0.05" | -- |
| 1997 | 83°F | 69°F | 0" | 0" |
| 1996 | 87°F | 66°F | 0" | 0" |
| 1995 | 83°F | 68°F | 0.56" | 0" |
| 1994 | 83°F | 69°F | 1.22" | 0" |
| 1993 | 78°F | 68°F | 0.53" | 0" |
| 1992 | 88°F | 68°F | 0" | 0" |
| 1991 | 83°F | 68°F | 0" | 0" |
| 1990 | 82°F | 70°F | 0.43" | 0" |
| 1989 | 78°F | 63°F | 2.03" | 0" |
| 1988 | 82°F | 68°F | 0.36" | 0" |
| 1987 | 81°F | 68°F | 0.3" | 0" |
| 1986 | 85°F | 68°F | 0.03" | 0" |
| 1985 | 73°F | 65°F | 0.03" | 0" |
| 1984 | 80°F | 68°F | 0.94" | 0" |
| 1983 | 81°F | 69°F | 0.53" | 0" |
| 1982 | 80°F | 67°F | 0.71" | 0" |
| 1981 | 82°F | 62°F | 0.08" | 0" |
| 1980 | 85°F | 69°F | 0.18" | 0" |
| 1979 | 82°F | 66°F | 0.03" | 0" |
| 1978 | 86°F | 68°F | 0.05" | 0" |
| 1977 | 79°F | 67°F | 1.63" | 0" |
| 1976 | 78°F | 67°F | 2.03" | 0" |
| 1975 | 82°F | 67°F | 0.1" | 0" |
| 1974 | 82°F | 64°F | 0.3" | 0" |
| 1973 | 80°F | 65°F | 0.84" | 0" |
| 1972 | 82°F | 67°F | 0.23" | 0" |
| 1971 | 80°F | 64°F | 1.09" | 0" |