May is one of the cooler months of the year in Oceanside, with average highs near 19.4°C and lows around 14.3°C (mean 16.9°C). It is one of the drier months, averaging 7 mm of rainfall and 77% relative humidity across the period.
May is one of the cooler months of the year in Oceanside. Across 45 years of records, the warmest Mays in Oceanside were 1984 and 1997 — when the month averaged 19.2°C — while the coldest were 1995 and 1999 at 15.1°C. Typical May days reach 19.4°C with nights near 14.3°C. The long-term trend is cooling, about 0.2°C per decade.
May is one of the drier months in Oceanside, averaging 7 mm of rainfall. The wettest May on record was 1998 with 42 mm, while the driest were 2004, 2007 and 2022, among others at 0 mm.
Relative humidity in Oceanside during May averages 77%. The most humid Mays were 2019 and 2023 at 83%, and the least humid was 1984 at 67%.
May receives about 6.8 kWh/m²/day of solar energy in Oceanside. The sunniest Mays were 2014 and 2020 at 7.7 kWh/m²/day, and the cloudiest were 1994, 1995 and 2023 at 5.8.
Average wind speed in Oceanside during May is 2.7 m/s. The windiest Mays were 1991 and 1998 at 3.3 m/s, while the calmest was 1997 at 2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 17.4°C | 16.8°C | 16.8°C | 16.7°C | 16.6°C | -0.8°C |
| Avg High | 20.4°C | 19.2°C | 19.4°C | 19.1°C | 19.0°C | -1.4°C |
| Avg Low | 14.5°C | 14.4°C | 14.2°C | 14.2°C | 14.2°C | -0.3°C |
| Avg Rain | 3 mm | 9 mm | 5 mm | 12 mm | 4 mm | +1 mm |
May temperatures in Oceanside have fallen by about 1.1°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 10.3°C (1999) to a record high of 29.8°C (2014).
Rainfall in May is one of the drier months, averaging 7 mm, with a wettest year of 42 mm.
A good time to visit Oceanside
May is a good time to visit Oceanside, with days averaging 19.4°C and nights around 14.3°C (mean 16.9°C, close to Oceanside's yearly average) and low rainfall. August and September are marginally more temperate, but May still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 19.9°C | 17.3°C | 14.8°C | 26.6°C | 12.4°C | 6 mm | 78% | 2.5 m/s | 6.7 |
| 2024 | 17.6°C | 15.5°C | 13.5°C | 19.5°C | 12.5°C | 3 mm | 82% | 2.5 m/s | 6.3 |
| 2023 | 17.5°C | 15.5°C | 13.5°C | 19.7°C | 11.8°C | 8 mm | 83% | 2.8 m/s | 5.8 |
| 2022 | 19.3°C | 16.6°C | 13.8°C | 24.9°C | 12.0°C | 0 mm | 77% | 2.4 m/s | 7.2 |
| 2021 | 18.8°C | 16.1°C | 13.5°C | 24.1°C | 11.9°C | 3 mm | 79% | 2.5 m/s | 7.1 |
| 2020 | 20.8°C | 18.4°C | 16.0°C | 25.4°C | 14.6°C | 3 mm | 80% | 2.6 m/s | 7.7 |
| 2019 | 17.6°C | 15.9°C | 14.1°C | 19.5°C | 12.8°C | 33 mm | 83% | 3.1 m/s | 6.2 |
| 2018 | 18.6°C | 16.4°C | 14.1°C | 24.8°C | 12.1°C | 5 mm | 78% | 2.9 m/s | 6.4 |
| 2017 | 19.3°C | 16.8°C | 14.4°C | 25.3°C | 12.1°C | 13 mm | 78% | 2.8 m/s | 6.8 |
| 2016 | 18.7°C | 16.5°C | 14.4°C | 21.9°C | 12.9°C | 11 mm | 81% | 2.8 m/s | 6.5 |
| 2015 | 18.7°C | 16.5°C | 14.4°C | 25.4°C | 12.8°C | 31 mm | 78% | 2.9 m/s | 6.2 |
| 2014 | 21.9°C | 19.0°C | 16.0°C | 29.8°C | 13.6°C | 1 mm | 69% | 2.5 m/s | 7.7 |
| 2013 | 20.5°C | 17.7°C | 14.9°C | 26.9°C | 13.1°C | 11 mm | 76% | 2.6 m/s | 7.4 |
| 2012 | 19.3°C | 16.4°C | 13.5°C | 23.3°C | 11.2°C | 1 mm | 79% | 2.4 m/s | 7.3 |
| 2011 | 18.3°C | 15.9°C | 13.5°C | 25.3°C | 11.9°C | 16 mm | 76% | 3.1 m/s | 7.3 |
| 2010 | 18.0°C | 15.5°C | 13.0°C | 21.9°C | 11.9°C | 1 mm | 78% | 2.8 m/s | 7.6 |
| 2009 | 19.1°C | 16.6°C | 14.0°C | 24.2°C | 12.4°C | 1 mm | 82% | 2.1 m/s | 6.9 |
| 2008 | 19.2°C | 16.6°C | 14.1°C | 29.0°C | 11.9°C | 5 mm | 75% | 2.7 m/s | 6.9 |
| 2007 | 18.5°C | 15.8°C | 13.1°C | 25.7°C | 11.3°C | 0 mm | 76% | 2.5 m/s | 7 |
| 2006 | 19.5°C | 16.8°C | 14.2°C | 24.8°C | 12.8°C | 15 mm | 80% | 2.3 m/s | 6.4 |
| 2005 | 19.7°C | 17.5°C | 15.2°C | 23.9°C | 13.7°C | 4 mm | 80% | 2.5 m/s | 7.2 |
| 2004 | 21.0°C | 18.2°C | 15.5°C | 28.0°C | 13.4°C | 0 mm | 73% | 2.7 m/s | 7.5 |
| 2003 | 18.6°C | 16.2°C | 13.7°C | 26.7°C | 11.7°C | 15 mm | 80% | 2.6 m/s | 6.6 |
| 2002 | 18.1°C | 15.4°C | 12.8°C | 24.7°C | 11.2°C | 1 mm | 78% | 2.6 m/s | 7.1 |
| 2001 | 20.2°C | 17.3°C | 14.3°C | 24.8°C | 11.9°C | 2 mm | 80% | 2.2 m/s | 6.3 |
| 2000 | 20.0°C | 17.5°C | 14.9°C | 25.3°C | 13.2°C | 3 mm | 78% | 2.5 m/s | 6.9 |
| 1999 | 17.6°C | 15.1°C | 12.6°C | 22.6°C | 10.3°C | 2 mm | 79% | 2.6 m/s | 6.6 |
| 1998 🌧️ | 17.5°C | 15.9°C | 14.2°C | 19.4°C | 12.7°C | 42 mm | 80% | 3.3 m/s | 6.6 |
| 1997 | 22.2°C | 19.2°C | 16.3°C | 26.2°C | 14.1°C | 1 mm | 78% | 2 m/s | 7.2 |
| 1996 | 20.1°C | 17.6°C | 15.2°C | 25.6°C | 13.1°C | 2 mm | 77% | 2.7 m/s | 7.5 |
| 1995 ❄️ | 17.1°C | 15.1°C | 13.2°C | 22.7°C | 11.9°C | 14 mm | 82% | 3.2 m/s | 5.8 |
| 1994 | 18.0°C | 15.7°C | 13.4°C | 22.3°C | 12.0°C | 4 mm | 80% | 2.6 m/s | 5.8 |
| 1993 | 20.7°C | 18.1°C | 15.6°C | 28.2°C | 14.1°C | 3 mm | 78% | 3 m/s | 7 |
| 1992 | 21.3°C | 18.6°C | 16.0°C | 24.2°C | 15.0°C | 6 mm | 80% | 2.5 m/s | 6.1 |
| 1991 | 17.9°C | 15.4°C | 12.9°C | 23.5°C | 11.7°C | 1 mm | 77% | 3.3 m/s | 6.8 |
| 1990 | 19.7°C | 17.1°C | 14.4°C | 27.4°C | 12.7°C | 16 mm | 75% | 3.2 m/s | 6.8 |
| 1989 | 19.8°C | 17.1°C | 14.4°C | 24.1°C | 13.4°C | 5 mm | 74% | 2.9 m/s | 6.7 |
| 1988 | 20.3°C | 17.3°C | 14.3°C | 25.8°C | 11.6°C | 3 mm | 72% | 3 m/s | 6.8 |
| 1987 | 21.3°C | 18.4°C | 15.5°C | 26.4°C | 13.6°C | 3 mm | 69% | 2.7 m/s | 6.2 |
| 1986 | 20.4°C | 17.5°C | 14.6°C | 27.2°C | 11.8°C | 1 mm | 71% | 2.7 m/s | 7.1 |
| 1985 | 19.3°C | 16.4°C | 13.6°C | 23.9°C | 11.9°C | 3 mm | 74% | 2.7 m/s | 6.6 |
| 1984 🔥 | 22.8°C | 19.2°C | 15.6°C | 29.1°C | 12.8°C | 0 mm | 67% | 2.5 m/s | 6.5 |
| 1983 | 20.1°C | 17.3°C | 14.4°C | 23.8°C | 12.6°C | 3 mm | 77% | 2.9 m/s | — |
| 1982 | 19.2°C | 16.4°C | 13.7°C | 23.8°C | 12.5°C | 6 mm | 77% | 2.9 m/s | — |
| 1981 | 20.4°C | 17.4°C | 14.4°C | 27.9°C | 12.7°C | 5 mm | 72% | 2.7 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 19.4°C with lows near 14.3°C (mean 16.9°C), based on 45 years of NASA POWER data.
May averages 7 mm of rainfall in Oceanside, one of the drier months. The wettest on record was 42 mm in 1998.
The hottest May reached 29.8°C in 2014. The coldest dipped to 10.3°C in 1999.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have fallen by about 1.1°C. Daytime highs moved from 20.4°C to 18.6°C and overnight lows from 14.3°C to 13.8°C over the same span.
May is one of the cooler months of the year in Oceanside and one of the drier months, so plan for around 19.4°C daytime highs and 14.3°C at night.
Not quite — May is the 6th coolest month in Oceanside, averaging 16.9°C.
For May in Oceanside, pack light layers you can adjust through the day, with typical highs of 19.4°C and lows of 14.3°C.
Relative humidity in May averages 77% — quite humid.
Average wind speed in May is 2.7 m/s. The windiest May on record averaged 3.3 m/s (1991).
The wettest May on record was 1998 with 42 mm. On average, May sees 7 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 May, 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 May specifically, along with year-by-year records and how the month has changed over the decades.
