April is one of the cooler months of the year in Oceanside, with average highs near 18.5°C and lows around 13.3°C (mean 15.9°C). It is about average for rainfall, averaging 20 mm of rainfall and 75% relative humidity across the period.
April is one of the cooler months of the year in Oceanside. Across 45 years of records, the warmest April in Oceanside was 1992 — when the month averaged 18.3°C — while the coldest was 1999 at 13.8°C. Typical April days reach 18.5°C with nights near 13.3°C. The long-term April temperature trend is broadly flat.
April is about average for rainfall in Oceanside, averaging 20 mm of rainfall. The wettest April on record was 2020 with 97 mm, while the driest was 1993 at 0 mm.
Relative humidity in Oceanside during April averages 75%. The most humid April was 2020 at 81%, and the least humid was 1987 at 67%.
April receives about 6.4 kWh/m²/day of solar energy in Oceanside. The sunniest April was 2017 at 7.2 kWh/m²/day, and the cloudiest was 1990 at 5.6.
Average wind speed in Oceanside during April is 2.9 m/s. The windiest April was 1983 at 3.7 m/s, while the calmest were 1987 and 1992 at 2.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 16.5°C | 16.2°C | 15.2°C | 16.1°C | 15.7°C | -0.8°C |
| Avg High | 19.4°C | 18.8°C | 17.7°C | 18.7°C | 18.2°C | -1.2°C |
| Avg Low | 13.6°C | 13.6°C | 12.8°C | 13.5°C | 13.3°C | -0.3°C |
| Avg Rain | 26 mm | 20 mm | 19 mm | 16 mm | 21 mm | -5 mm |
April temperatures in Oceanside have fallen by about 0.4°C between 1981–1985 and 2021–2025.
April has ranged from a record low of 8.5°C (2011) to a record high of 31.9°C (1989).
Rainfall in April is about average for rainfall, averaging 20 mm, with a wettest year of 97 mm.
Daytime highs and overnight lows have shifted differently — highs fell about 0.2°C per decade while lows rose 0°C per decade, narrowing the gap between day and night.
A good time to visit Oceanside
April is a good time to visit Oceanside, with days averaging 18.5°C and nights around 13.3°C (mean 15.9°C, cooler than Oceanside's yearly average) and low rainfall. August 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 | 17.6°C | 15.3°C | 13.0°C | 21.3°C | 11.4°C | 6 mm | 78% | 2.8 m/s | 6.1 |
| 2024 | 17.7°C | 15.3°C | 12.9°C | 21.2°C | 10.8°C | 12 mm | 79% | 2.8 m/s | 6.3 |
| 2023 | 17.3°C | 14.8°C | 12.2°C | 23.3°C | 9.9°C | 2 mm | 79% | 2.5 m/s | 6.3 |
| 2022 | 19.4°C | 16.8°C | 14.1°C | 28.8°C | 12.4°C | 5 mm | 75% | 2.9 m/s | 6.9 |
| 2021 | 18.4°C | 15.8°C | 13.2°C | 25.0°C | 11.1°C | 3 mm | 77% | 2.7 m/s | 6.6 |
| 2020 🌧️ | 18.5°C | 16.4°C | 14.3°C | 26.2°C | 11.4°C | 97 mm | 81% | 2.6 m/s | 5.9 |
| 2019 | 18.6°C | 16.3°C | 14.0°C | 23.2°C | 12.7°C | 7 mm | 80% | 2.7 m/s | 6.4 |
| 2018 | 18.8°C | 16.1°C | 13.3°C | 25.5°C | 11.4°C | 4 mm | 74% | 2.9 m/s | 6.8 |
| 2017 | 19.3°C | 16.8°C | 14.2°C | 23.5°C | 11.9°C | 5 mm | 78% | 2.7 m/s | 7.2 |
| 2016 | 19.7°C | 17.3°C | 14.8°C | 25.4°C | 13.2°C | 29 mm | 74% | 2.8 m/s | 6.6 |
| 2015 | 20.0°C | 17.4°C | 14.7°C | 25.7°C | 12.5°C | 6 mm | 70% | 2.6 m/s | 6.8 |
| 2014 | 19.7°C | 16.8°C | 13.9°C | 28.3°C | 11.2°C | 15 mm | 72% | 2.8 m/s | 6.9 |
| 2013 | 18.2°C | 15.5°C | 12.8°C | 22.9°C | 11.2°C | 2 mm | 77% | 2.9 m/s | 6.4 |
| 2012 | 18.2°C | 15.4°C | 12.6°C | 23.1°C | 10.6°C | 41 mm | 74% | 2.8 m/s | 6.4 |
| 2011 | 17.8°C | 15.4°C | 13.0°C | 23.5°C | 8.5°C | 8 mm | 77% | 2.8 m/s | 6.5 |
| 2010 | 16.7°C | 14.4°C | 12.1°C | 21.9°C | 10.5°C | 47 mm | 76% | 3.3 m/s | 6.6 |
| 2009 | 17.6°C | 15.2°C | 12.7°C | 26.8°C | 10.7°C | 4 mm | 73% | 2.9 m/s | 6.7 |
| 2008 | 18.6°C | 15.8°C | 12.9°C | 28.7°C | 10.4°C | 1 mm | 71% | 2.6 m/s | 7 |
| 2007 | 17.5°C | 14.9°C | 12.4°C | 23.5°C | 10.5°C | 14 mm | 77% | 2.7 m/s | 6.1 |
| 2006 | 17.0°C | 14.9°C | 12.7°C | 21.8°C | 11.0°C | 35 mm | 78% | 2.8 m/s | 6 |
| 2005 | 18.0°C | 15.6°C | 13.2°C | 22.0°C | 11.4°C | 16 mm | 75% | 3 m/s | 6.8 |
| 2004 | 18.8°C | 16.3°C | 13.8°C | 25.8°C | 12.1°C | 16 mm | 76% | 2.6 m/s | 6.6 |
| 2003 | 16.8°C | 14.6°C | 12.4°C | 22.5°C | 10.7°C | 39 mm | 76% | 3.5 m/s | 6.6 |
| 2002 | 17.0°C | 14.6°C | 12.3°C | 23.4°C | 10.1°C | 12 mm | 78% | 3 m/s | 6 |
| 2001 | 16.4°C | 14.1°C | 11.7°C | 24.0°C | 9.6°C | 31 mm | 76% | 3.2 m/s | 6 |
| 2000 | 19.0°C | 16.3°C | 13.7°C | 24.0°C | 11.6°C | 23 mm | 78% | 3.1 m/s | 6.5 |
| 1999 ❄️ | 16.1°C | 13.8°C | 11.6°C | 26.4°C | 9.0°C | 47 mm | 73% | 3.4 m/s | 5.7 |
| 1998 | 17.3°C | 15.2°C | 13.0°C | 23.4°C | 10.0°C | 43 mm | 75% | 3.4 m/s | 6.6 |
| 1997 | 19.4°C | 16.6°C | 13.7°C | 23.6°C | 11.1°C | 6 mm | 72% | 3.3 m/s | 6.6 |
| 1996 | 20.5°C | 17.5°C | 14.4°C | 28.2°C | 12.7°C | 11 mm | 70% | 2.9 m/s | 7 |
| 1995 | 17.9°C | 15.4°C | 12.9°C | 23.1°C | 10.9°C | 34 mm | 75% | 3.4 m/s | 6.1 |
| 1994 | 18.1°C | 15.5°C | 13.0°C | 23.6°C | 11.7°C | 29 mm | 78% | 2.9 m/s | 5.8 |
| 1993 | 19.8°C | 17.2°C | 14.6°C | 22.8°C | 12.8°C | 0 mm | 75% | 2.5 m/s | 6.6 |
| 1992 🔥 | 21.0°C | 18.3°C | 15.7°C | 25.4°C | 13.5°C | 3 mm | 76% | 2.4 m/s | 6.3 |
| 1991 | 18.1°C | 15.4°C | 12.8°C | 23.5°C | 10.4°C | 2 mm | 74% | 3.2 m/s | 6.7 |
| 1990 | 19.3°C | 16.6°C | 13.9°C | 23.5°C | 11.5°C | 22 mm | 77% | 2.7 m/s | 5.6 |
| 1989 | 20.8°C | 17.6°C | 14.4°C | 31.9°C | 11.8°C | 2 mm | 72% | 2.8 m/s | 6.3 |
| 1988 | 19.5°C | 16.8°C | 14.2°C | 26.0°C | 12.3°C | 71 mm | 71% | 2.9 m/s | 5.8 |
| 1987 | 21.2°C | 17.8°C | 14.4°C | 27.9°C | 12.0°C | 11 mm | 67% | 2.4 m/s | 6.3 |
| 1986 | 18.9°C | 16.2°C | 13.5°C | 24.7°C | 11.9°C | 15 mm | 72% | 2.9 m/s | 6.3 |
| 1985 | 20.1°C | 16.7°C | 13.4°C | 25.5°C | 11.5°C | 6 mm | 69% | 2.7 m/s | 6.3 |
| 1984 | 19.3°C | 16.4°C | 13.4°C | 25.4°C | 11.2°C | 16 mm | 68% | 3.6 m/s | 6.2 |
| 1983 | 17.1°C | 14.8°C | 12.5°C | 22.7°C | 9.7°C | 76 mm | 74% | 3.7 m/s | — |
| 1982 | 18.3°C | 15.7°C | 13.1°C | 25.5°C | 10.0°C | 23 mm | 72% | 3.1 m/s | — |
| 1981 | 19.3°C | 16.2°C | 13.1°C | 25.8°C | 11.4°C | 13 mm | 70% | 2.8 m/s | — |
Actual recorded April data for each year, 1981–2025 — sourced from NASA POWER.
The average high in April is around 18.5°C with lows near 13.3°C (mean 15.9°C), based on 45 years of NASA POWER data.
April averages 20 mm of rainfall in Oceanside, about average for rainfall. The wettest on record was 97 mm in 2020.
The hottest April reached 31.9°C in 1989. The coldest dipped to 8.5°C in 2011.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average April temperatures have fallen by about 0.4°C. Daytime highs moved from 18.8°C to 18.1°C and overnight lows from 13.1°C to 13.1°C over the same span.
April is one of the cooler months of the year in Oceanside and about average for rainfall, so plan for around 18.5°C daytime highs and 13.3°C at night.
Not quite — April is the 5th coolest month in Oceanside, averaging 15.9°C.
For April in Oceanside, pack light layers you can adjust through the day, with typical highs of 18.5°C and lows of 13.3°C.
Relative humidity in April averages 75% — moderately humid.
Average wind speed in April is 2.9 m/s. The windiest April on record averaged 3.7 m/s (1983).
The wettest April on record was 2020 with 97 mm. On average, April sees 20 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 Oceanside 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.
