Basilemorin / CC0
Mission Viejo, CA Weather on April 21
April 21st in Mission Viejo, CA typically brings pleasant spring weather, with average highs around 73°F and lows near 51°F. Over 55 years of records, the warmest April 21st was in 2009 (79°F average), while the coldest was 2010 (50°F) — a 29°F range across recorded history. Rain or other precipitation has occurred on about 5% of April 21st dates historically. The last decade has been 3.4°F warmer on this date compared to 20-30 years ago.
What to Expect on April 21
Planning for April 21st in Mission Viejo, CA? Great weather for outdoor activities.
April 21 Weather Records for Mission Viejo
- •The all-time record high for April 21st in Mission Viejo, CA is 98°F, set in 2009.
- •The coldest April 21st on record dropped to 43°F in 2007.
- •Temperatures have reached 90°F or higher on April 21st in 2 of the last 55 years.
- •Last year (1971), April 21st was 10°F cooler than the long-term average.
Frequently Asked Questions
What was the warmest April 21 ever in Mission Viejo?
The warmest April 21 in Mission Viejo, CA reached 98°F in 2009. That is 25°F above the long-term average high of 73°F.
What was the coldest April 21 ever in Mission Viejo?
The coldest April 21 in Mission Viejo, CA dropped to 43°F in 2007. That is 8°F below the long-term average low of 51°F.
What is the average temperature on April 21 in Mission Viejo?
On April 21, Mission Viejo averages a high of 73°F and a low of 51°F based on 55 years of NOAA weather observations from EL TORO MCAS.
How many years of weather data are available for April 21 in Mission Viejo?
We have 55 years of weather records for April 21 in Mission Viejo, CA, sourced from NOAA's Global Historical Climatology Network. Records include daily high and low temperatures, precipitation, and snowfall data going back to 2025.
April 21 Weather History in Mission Viejo
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 73°F | 48°F | -- | -- |
| 2024 | 75°F | 52°F | -- | -- |
| 2023 | 87°F | 61°F | -- | -- |
| 2022 | 70°F | 48°F | -- | -- |
| 2021 | 62°F | 54°F | -- | -- |
| 2020 | 68°F | 54°F | -- | -- |
| 2019 | 62°F | 49°F | -- | -- |
| 2018 | 86°F | 52°F | -- | -- |
| 2017 | 89°F | 55°F | -- | -- |
| 2016 | 81°F | 56°F | -- | -- |
| 2015 | 63°F | 54°F | -- | -- |
| 2014 | 80°F | 52°F | -- | -- |
| 2013 | 79°F | 53°F | -- | -- |
| 2012 | 76°F | 53°F | -- | -- |
| 2011 | 66°F | 52°F | -- | -- |
| 2010 | 55°F | 45°F | -- | -- |
| 2009 | 98°F | 59°F | -- | -- |
| 2008 | 72°F | 46°F | 0" | -- |
| 2007 | 63°F | 43°F | -- | -- |
| 2006 | 69°F | 50°F | -- | -- |
| 2005 | 82°F | 47°F | 0" | -- |
| 2004 | 71°F | 48°F | -- | -- |
| 2003 | 64°F | 49°F | -- | -- |
| 2002 | 78°F | 47°F | -- | -- |
| 2001 | 59°F | 45°F | -- | -- |
| 2000 | 63°F | 50°F | -- | -- |
| 1999 | 65°F | 52°F | -- | -- |
| 1998 | 84°F | 57°F | 0" | -- |
| 1997 | 79°F | 57°F | 0" | -- |
| 1996 | 69°F | 48°F | 0" | -- |
| 1995 | 66°F | 45°F | 0" | -- |
| 1994 | 66°F | 58°F | 0" | -- |
| 1993 | 85°F | 58°F | 0" | -- |
| 1992 | 80°F | 57°F | 0" | -- |
| 1991 | 68°F | 56°F | 0" | -- |
| 1990 | 71°F | 55°F | 0" | -- |
| 1989 | 73°F | 56°F | 0" | -- |
| 1988 | 59°F | 46°F | 0.23" | -- |
| 1987 | 91°F | 58°F | 0" | -- |
| 1986 | 84°F | 55°F | 0" | -- |
| 1985 | 63°F | 51°F | 0" | -- |
| 1984 | 82°F | 47°F | 0" | -- |
| 1983 | 66°F | 53°F | 0" | -- |
| 1982 | 79°F | 63°F | 0" | -- |
| 1981 | 79°F | 49°F | 0" | -- |
| 1980 | 63°F | 52°F | 0.33" | -- |
| 1979 | 74°F | 50°F | 0" | -- |
| 1978 | 65°F | 48°F | 0" | -- |
| 1977 | 81°F | 46°F | 0" | -- |
| 1976 | 75°F | 51°F | 0" | -- |
| 1975 | 62°F | 49°F | 0" | -- |
| 1974 | 76°F | 44°F | 0" | -- |
| 1973 | 75°F | 43°F | 0" | -- |
| 1972 | 75°F | 44°F | 0" | -- |
| 1971 | 63°F | 46°F | 0.03" | -- |
Based on 55 years of data from NOAA station: EL TORO MCAS
Monthly Climate Averages
Historical temperature and precipitation averages for Mission Viejo, CA, based on 55+ years of weather data.
Temperatures in Fahrenheit. Precipitation and snowfall in inches.