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Riverside, CA Weather on April 20
April 20th in Riverside, CA typically brings pleasant spring weather, with average highs around 77°F and lows near 49°F — a 28°F daily swing. Over 55 years of records, the warmest April 20th was in 2009 (81°F average), while the coldest was 1972 (50°F) — a 31°F range across recorded history. Rain or other precipitation has occurred on about 7% of April 20th dates historically, with the wettest April 20th recording 3.53" of rain. The last decade has been 1.4°F warmer on this date compared to 20-30 years ago.
What to Expect on April 20
Planning for April 20th in Riverside, CA? Great weather for outdoor activities.
April 20 Weather Records for Riverside
- •The all-time record high for April 20th in Riverside, CA is 103°F, set in 2009.
- •The coldest April 20th on record dropped to 38°F in 1972.
- •Temperatures have reached 90°F or higher on April 20th in 6 of the last 55 years.
- •Last year (1971), April 20th was 15°F cooler than the long-term average.
Frequently Asked Questions
What was the warmest April 20 ever in Riverside?
The warmest April 20 in Riverside, CA reached 103°F in 2009. That is 26°F above the long-term average high of 77°F.
What was the coldest April 20 ever in Riverside?
The coldest April 20 in Riverside, CA dropped to 38°F in 1972. That is 11°F below the long-term average low of 49°F.
What is the average temperature on April 20 in Riverside?
On April 20, Riverside averages a high of 77°F and a low of 49°F based on 55 years of NOAA weather observations from RIVERSIDE CITRUS EXP.
How many years of weather data are available for April 20 in Riverside?
We have 55 years of weather records for April 20 in Riverside, 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 20 Weather History in Riverside
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 81°F | 48°F | 0" | -- |
| 2024 | 75°F | 51°F | 0" | -- |
| 2023 | 86°F | 45°F | 0" | -- |
| 2022 | 73°F | 53°F | 0" | -- |
| 2021 | 80°F | 52°F | 0" | -- |
| 2020 | 68°F | 54°F | 0" | -- |
| 2019 | 68°F | 54°F | 0" | -- |
| 2018 | 80°F | 45°F | 0" | -- |
| 2017 | 82°F | 51°F | 0" | -- |
| 2016 | 90°F | 53°F | 0" | -- |
| 2015 | 78°F | 54°F | 0" | -- |
| 2014 | 85°F | 55°F | 0" | -- |
| 2013 | 92°F | 46°F | 0" | -- |
| 2012 | 99°F | 56°F | 0" | -- |
| 2011 | 71°F | 57°F | 0" | -- |
| 2010 | 72°F | 50°F | 0.13" | -- |
| 2009 | 103°F | 59°F | 0" | -- |
| 2008 | 65°F | 49°F | 0" | -- |
| 2007 | 54°F | 48°F | 0.58" | -- |
| 2006 | 85°F | 46°F | 0" | -- |
| 2005 | 70°F | 45°F | 0" | -- |
| 2004 | 75°F | 45°F | 0" | -- |
| 2003 | 81°F | 49°F | 0" | -- |
| 2002 | 73°F | 46°F | 0" | -- |
| 2001 | 65°F | 43°F | 0" | -- |
| 2000 | 85°F | 48°F | 0" | -- |
| 1999 | 83°F | 52°F | 0" | -- |
| 1998 | 94°F | 50°F | 0" | -- |
| 1997 | 87°F | 52°F | 0" | -- |
| 1996 | 74°F | 45°F | 0" | -- |
| 1995 | 59°F | 42°F | 0" | -- |
| 1994 | 83°F | 54°F | 0" | -- |
| 1993 | 89°F | 52°F | 0" | -- |
| 1992 | 85°F | 51°F | 0" | -- |
| 1991 | 69°F | 46°F | 0" | -- |
| 1990 | 71°F | 56°F | 0" | -- |
| 1989 | 88°F | 53°F | 0" | -- |
| 1988 | 56°F | 49°F | 2.06" | -- |
| 1987 | 85°F | 44°F | 0" | -- |
| 1986 | 91°F | 48°F | 0" | -- |
| 1985 | 63°F | 50°F | 0" | -- |
| 1984 | 73°F | 41°F | 0" | -- |
| 1983 | 60°F | 52°F | 3.53" | -- |
| 1982 | 83°F | 52°F | 0" | -- |
| 1981 | 65°F | 49°F | 0" | -- |
| 1980 | 79°F | 50°F | 0" | -- |
| 1979 | 82°F | 46°F | 0" | -- |
| 1978 | 77°F | 48°F | 0" | -- |
| 1977 | 83°F | 46°F | 0" | -- |
| 1976 | 86°F | 49°F | 0" | -- |
| 1975 | 72°F | 45°F | 0" | -- |
| 1974 | 71°F | 44°F | 0" | -- |
| 1973 | 66°F | 44°F | 0" | -- |
| 1972 | 62°F | 38°F | 0" | -- |
| 1971 | 62°F | 47°F | 0" | -- |
Based on 55 years of data from NOAA station: RIVERSIDE CITRUS EXP
Monthly Climate Averages
Historical temperature and precipitation averages for Riverside, CA, based on 55+ years of weather data.
Temperatures in Fahrenheit. Precipitation and snowfall in inches.