April is one of the cooler months of the year in San Diego, with average highs near 21.9°C and lows around 8.9°C (mean 15.4°C). It is about average for rainfall, averaging 22 mm of rainfall and 63% relative humidity across the period.
April is one of the cooler months of the year in San Diego. Across 45 years of records, the warmest April in San Diego was 1989 — when the month averaged 18.2°C — while the coldest was 1983 at 12.2°C. Typical April days reach 21.9°C with nights near 8.9°C. The long-term April temperature trend is broadly flat.
April is about average for rainfall in San Diego, averaging 22 mm of rainfall. The wettest April on record was 2020 with 92 mm, while the driest was 1993 at 0 mm.
Relative humidity in San Diego during April averages 63%. The most humid April was 2020 at 73%, and the least humid was 1987 at 51%.
April receives about 6.1 kWh/m²/day of solar energy in San Diego. The sunniest April was 2017 at 6.9 kWh/m²/day, and the cloudiest were 1985 and 1994 at 5.3.
Average wind speed in San Diego during April is 2.6 m/s. The windiest April was 2003 at 3.3 m/s, while the calmest were 1992 and 1993 at 2.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 15.7°C | 15.2°C | 14.9°C | 15.8°C | 15.5°C | -0.2°C |
| Avg High | 22.4°C | 21.5°C | 21.3°C | 22.4°C | 21.9°C | -0.5°C |
| Avg Low | 8.9°C | 8.9°C | 8.5°C | 9.3°C | 9.2°C | +0.3°C |
| Avg Rain | 26 mm | 23 mm | 21 mm | 17 mm | 22 mm | -4 mm |
April temperatures in San Diego have risen by about 0.6°C between 1981–1985 and 2021–2025.
April has ranged from a record low of 1.6°C (1999) to a record high of 34.8°C (1989).
Rainfall in April is about average for rainfall, averaging 22 mm, with a wettest year of 92 mm.
A good time to visit San Diego
April is a good time to visit San Diego, with days averaging 21.9°C and nights around 8.9°C (mean 15.4°C, cooler than San Diego's yearly average) and low rainfall. June and September are marginally more temperate, but April still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 21.4°C | 15.2°C | 8.9°C | 29.7°C | 4.9°C | 10 mm | 66% | 2.6 m/s | 6.1 |
| 2024 | 20.9°C | 14.7°C | 8.5°C | 28.8°C | 3.8°C | 14 mm | 69% | 2.5 m/s | 6.2 |
| 2023 | 21.6°C | 14.9°C | 8.3°C | 29.1°C | 1.7°C | 2 mm | 67% | 2.2 m/s | 5.4 |
| 2022 | 23.6°C | 16.7°C | 9.8°C | 32.9°C | 4.7°C | 6 mm | 62% | 2.8 m/s | 6.7 |
| 2021 | 22.9°C | 16.0°C | 9.1°C | 33.6°C | 5.4°C | 4 mm | 62% | 2.6 m/s | 6.2 |
| 2020 🌧️ | 21.0°C | 15.7°C | 10.4°C | 32.3°C | 6.3°C | 92 mm | 73% | 2.5 m/s | 5.7 |
| 2019 | 22.0°C | 16.1°C | 10.2°C | 29.3°C | 7.4°C | 7 mm | 69% | 2.5 m/s | 6.1 |
| 2018 | 23.2°C | 16.3°C | 9.4°C | 31.5°C | 4.6°C | 2 mm | 58% | 2.7 m/s | 6.3 |
| 2017 | 23.0°C | 16.3°C | 9.7°C | 30.3°C | 6.6°C | 1 mm | 65% | 2.4 m/s | 6.9 |
| 2016 | 22.8°C | 16.7°C | 10.5°C | 30.0°C | 6.5°C | 26 mm | 61% | 2.5 m/s | 6.3 |
| 2015 | 23.4°C | 16.7°C | 9.9°C | 32.4°C | 6.3°C | 9 mm | 58% | 2.5 m/s | 6.8 |
| 2014 | 23.7°C | 16.8°C | 9.9°C | 31.8°C | 5.1°C | 18 mm | 57% | 2.7 m/s | 6.2 |
| 2013 | 22.9°C | 15.9°C | 8.8°C | 30.6°C | 4.4°C | 2 mm | 62% | 2.6 m/s | 5.6 |
| 2012 | 23.2°C | 16.1°C | 9.1°C | 32.1°C | 2.8°C | 50 mm | 60% | 2.4 m/s | 5.9 |
| 2011 | 20.5°C | 14.5°C | 8.6°C | 30.4°C | 3.0°C | 10 mm | 67% | 2.7 m/s | 6.1 |
| 2010 | 19.1°C | 13.0°C | 7.0°C | 26.2°C | 3.2°C | 50 mm | 70% | 2.8 m/s | 6.2 |
| 2009 | 20.9°C | 14.5°C | 8.0°C | 33.1°C | 4.7°C | 5 mm | 62% | 2.8 m/s | 6.1 |
| 2008 | 22.1°C | 15.2°C | 8.4°C | 31.4°C | 4.1°C | 0 mm | 59% | 2.8 m/s | 6.5 |
| 2007 | 22.4°C | 15.5°C | 8.6°C | 33.3°C | 5.3°C | 12 mm | 61% | 2.5 m/s | 5.5 |
| 2006 | 19.9°C | 13.9°C | 8.0°C | 28.5°C | 4.0°C | 37 mm | 70% | 2.8 m/s | 6.1 |
| 2005 | 20.5°C | 14.5°C | 8.4°C | 26.9°C | 4.4°C | 15 mm | 67% | 2.6 m/s | 6.5 |
| 2004 | 23.1°C | 16.5°C | 10.0°C | 34.0°C | 6.6°C | 23 mm | 63% | 2.4 m/s | 6.3 |
| 2003 | 18.4°C | 12.9°C | 7.4°C | 27.0°C | 3.8°C | 42 mm | 71% | 3.3 m/s | 6.7 |
| 2002 | 21.9°C | 15.3°C | 8.6°C | 32.7°C | 5.9°C | 15 mm | 64% | 2.9 m/s | 5.4 |
| 2001 | 20.1°C | 13.9°C | 7.6°C | 31.3°C | 3.0°C | 34 mm | 65% | 2.8 m/s | 5.6 |
| 2000 | 23.6°C | 16.6°C | 9.6°C | 32.5°C | 7.1°C | 26 mm | 63% | 2.5 m/s | 6.2 |
| 1999 | 18.3°C | 12.6°C | 6.9°C | 31.4°C | 1.6°C | 58 mm | 66% | 3.1 m/s | 5.8 |
| 1998 | 18.7°C | 13.3°C | 8.0°C | 28.4°C | 4.7°C | 53 mm | 71% | 2.8 m/s | 6.3 |
| 1997 | 22.6°C | 15.8°C | 8.9°C | 29.8°C | 4.5°C | 5 mm | 61% | 2.6 m/s | 6.6 |
| 1996 | 24.4°C | 17.1°C | 9.8°C | 33.4°C | 6.1°C | 13 mm | 55% | 2.5 m/s | 6.7 |
| 1995 | 19.4°C | 13.8°C | 8.2°C | 26.6°C | 4.4°C | 35 mm | 68% | 3 m/s | 6.3 |
| 1994 | 21.5°C | 15.2°C | 8.9°C | 29.1°C | 6.2°C | 37 mm | 66% | 2.6 m/s | 5.3 |
| 1993 | 23.0°C | 16.3°C | 9.5°C | 29.3°C | 6.7°C | 0 mm | 65% | 2.1 m/s | 6.4 |
| 1992 | 24.2°C | 17.5°C | 10.8°C | 30.6°C | 7.5°C | 7 mm | 65% | 2.1 m/s | 5.9 |
| 1991 | 20.6°C | 14.2°C | 7.8°C | 28.1°C | 4.1°C | 2 mm | 65% | 2.8 m/s | 6.5 |
| 1990 | 22.7°C | 16.3°C | 10.0°C | 30.5°C | 7.7°C | 21 mm | 66% | 2.6 m/s | 5.6 |
| 1989 🔥 | 25.8°C | 18.2°C | 10.6°C | 34.8°C | 6.4°C | 3 mm | 57% | 2.5 m/s | 5.6 |
| 1988 | 21.7°C | 15.6°C | 9.4°C | 31.6°C | 5.9°C | 74 mm | 61% | 2.7 m/s | 6 |
| 1987 | 25.5°C | 18.0°C | 10.5°C | 31.4°C | 6.1°C | 11 mm | 51% | 2.2 m/s | 5.8 |
| 1986 | 21.1°C | 14.6°C | 8.1°C | 29.0°C | 6.0°C | 11 mm | 64% | 2.6 m/s | 6.3 |
| 1985 | 24.3°C | 16.9°C | 9.5°C | 32.4°C | 4.5°C | 10 mm | 54% | 2.3 m/s | 5.3 |
| 1984 | 22.2°C | 15.4°C | 8.7°C | 31.7°C | 5.4°C | 14 mm | 56% | 2.9 m/s | 6.2 |
| 1983 ❄️ | 17.5°C | 12.2°C | 6.8°C | 23.7°C | 1.7°C | 67 mm | 71% | 3.1 m/s | — |
| 1982 | 20.5°C | 14.2°C | 8.0°C | 27.4°C | 3.9°C | 25 mm | 66% | 2.8 m/s | — |
| 1981 | 22.9°C | 15.8°C | 8.7°C | 31.3°C | 5.0°C | 19 mm | 58% | 2.4 m/s | — |
Actual recorded April data for each year, 1981–2025 — sourced from NASA POWER.
The average high in April is around 21.9°C with lows near 8.9°C (mean 15.4°C), based on 45 years of NASA POWER data.
April averages 22 mm of rainfall in San Diego, about average for rainfall. The wettest on record was 92 mm in 2020.
The hottest April reached 34.8°C in 1989. The coldest dipped to 1.6°C in 1999.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average April temperatures have risen by about 0.6°C. Daytime highs moved from 21.5°C to 22.1°C and overnight lows from 8.3°C to 8.9°C over the same span.
April is one of the cooler months of the year in San Diego and about average for rainfall, so plan for around 21.9°C daytime highs and 8.9°C at night.
Not quite — April is the 6th coolest month in San Diego, averaging 15.4°C.
For April in San Diego, pack light layers you can adjust through the day, with typical highs of 21.9°C and lows of 8.9°C.
Relative humidity in April averages 63% — moderately humid.
Average wind speed in April is 2.6 m/s. The windiest April on record averaged 3.3 m/s (2003).
The wettest April on record was 2020 with 92 mm. On average, April sees 22 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in San Diego behaves each April, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for April specifically, along with year-by-year records and how the month has changed over the decades.
