Weather on October 21 at Channel Islands
Channel Islands National Park
CAPacific West
Avg High79°F
Avg Low48°F
Warmest200378°F
Coldest197553°F
Based on 55 years of data from Ventura, CA
Planning Your Visit
October 21st in Channel Islands National Park (via Ventura, CA) typically brings pleasant fall weather, with average highs around 79°F and lows near 48°F — a 31°F daily swing. Over 55 years of records, the warmest October 21st was in 2003 (78°F average), while the coldest was 1975 (53°F) — a 25°F range across recorded history. Rain or other precipitation has occurred on about 2% of October 21st dates historically. The last decade has been 2.6°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.6°F warmer on this date compared to 20-30 years ago.
Planning for October 21st in Channel Islands? Great weather for outdoor activities.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 86°F | 43°F | 0" | -- |
| 2024 | 85°F | 41°F | 0" | -- |
| 2023 | 98°F | 44°F | 0" | -- |
| 2022 | 91°F | 46°F | 0" | -- |
| 2021 | 77°F | 38°F | 0" | -- |
| 2020 | 83°F | 48°F | 0" | -- |
| 2019 | 86°F | 45°F | 0" | -- |
| 2018 | 91°F | 46°F | 0" | -- |
| 2017 | 79°F | 40°F | 0" | -- |
| 2016 | 97°F | 44°F | 0" | -- |
| 2015 | 85°F | 47°F | 0" | -- |
| 2014 | 80°F | 45°F | 0" | -- |
| 2013 | 81°F | 38°F | 0" | -- |
| 2012 | 68°F | 59°F | -- | -- |
| 2011 | 75°F | 50°F | -- | -- |
| 2010 | 61°F | 55°F | -- | -- |
| 2009 | 82°F | 46°F | -- | -- |
| 2008 | 90°F | 46°F | -- | -- |
| 2007 | 82°F | 48°F | -- | -- |
| 2006 | 86°F | 48°F | -- | -- |
| 2005 | 72°F | 50°F | -- | -- |
| 2004 | 66°F | 43°F | -- | -- |
| 2003 | 99°F | 57°F | -- | -- |
| 2002 | 68°F | 51°F | 0" | 0" |
| 2001 | 68°F | 54°F | -- | -- |
| 2000 | 66°F | 52°F | -- | -- |
| 1999 | 98°F | 48°F | 0" | 0" |
| 1998 | 80°F | 42°F | 0" | 0" |
| 1997 | 77°F | 45°F | 0" | 0" |
| 1996 | 78°F | 38°F | 0" | 0" |
| 1995 | 73°F | 56°F | 0" | 0" |
| 1994 | -- | 42°F | 0" | 0" |
| 1993 | 85°F | 48°F | 0" | 0" |
| 1992 | 74°F | 57°F | -- | 0" |
| 1991 | 77°F | 59°F | 0" | 0" |
| 1990 | 81°F | 40°F | 0" | 0" |
| 1989 | 66°F | 54°F | 0" | 0" |
| 1988 | 78°F | 56°F | 0" | 0" |
| 1987 | 79°F | 62°F | 0" | 0" |
| 1986 | 82°F | 50°F | 0" | 0" |
| 1985 | 64°F | 53°F | 0" | 0" |
| 1984 | 73°F | 40°F | 0" | 0" |
| 1983 | 86°F | 45°F | 0" | 0" |
| 1982 | 80°F | 48°F | 0" | 0" |
| 1981 | 85°F | 43°F | 0" | 0" |
| 1980 | 86°F | 43°F | 0" | 0" |
| 1979 | 74°F | 36°F | 0" | 0" |
| 1978 | 75°F | 52°F | 0" | 0" |
| 1977 | 76°F | 44°F | 0" | 0" |
| 1976 | 79°F | 58°F | 0.1" | 0" |
| 1975 | 60°F | 46°F | 0" | 0" |
| 1974 | 68°F | 55°F | 0" | 0" |
| 1973 | 78°F | 53°F | 0" | 0" |
| 1972 | 74°F | 43°F | 0" | 0" |
| 1971 | 82°F | 54°F | 0" | 0" |
October 21 at Nearby Parks
Holiday Weather at Channel Islands
Official NPS WebsiteVisit nps.gov/chis for park information, alerts, and reservations
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