January is one of the cooler months of the year in Oceanside, with average highs near 17.3°C and lows around 12.4°C (mean 14.9°C). It is a relatively wet time of year, averaging 64 mm of rainfall and 70% relative humidity across the period.
January is one of the cooler months of the year in Oceanside. Across 45 years of records, the warmest January in Oceanside was 2018 — when the month averaged 17.3°C — while the coldest was 1989 at 13.1°C. Typical January days reach 17.3°C with nights near 12.4°C. The long-term trend is warming, about 0.2°C per decade.
January is a relatively wet time of year in Oceanside, averaging 64 mm of rainfall. The wettest January on record was 1993 with 334 mm, while the driest was 2014 at 3 mm.
Relative humidity in Oceanside during January averages 70%. The most humid January was 1995 at 81%, and the least humid was 2007 at 62%.
January receives about 3.2 kWh/m²/day of solar energy in Oceanside. The sunniest January was 2006 at 3.6 kWh/m²/day, and the cloudiest were 1993 and 1995 at 2.6.
Average wind speed in Oceanside during January is 2.7 m/s. The windiest January was 1993 at 3.8 m/s, while the calmest was 2014 at 1.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 14.5°C | 14.7°C | 14.7°C | 15.5°C | 14.9°C | +0.4°C |
| Avg High | 17.2°C | 17.1°C | 17.1°C | 17.8°C | 17.1°C | -0.1°C |
| Avg Low | 11.8°C | 12.3°C | 12.3°C | 13.1°C | 12.7°C | +0.9°C |
| Avg Rain | 43 mm | 101 mm | 46 mm | 72 mm | 47 mm | +4 mm |
January temperatures in Oceanside have risen by about 0.3°C between 1981–1985 and 2021–2025.
January has ranged from a record low of 6°C (1987) to a record high of 25.5°C (2018).
Rainfall in January is a relatively wet time of year, averaging 64 mm, with a wettest year of 334 mm.
A quieter season to visit Oceanside
If your dates are flexible, the more temperate months of August and September tend to be the most comfortable for visiting Oceanside. That said, January — with days averaging 17.3°C and nights around 12.4°C (mean 14.9°C) and moderate rainfall (64 mm) — can still be rewarding for travellers who don't mind the cooler conditions, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 17.1°C | 14.6°C | 12.1°C | 21.7°C | 10.0°C | 16 mm | 66% | 2.3 m/s | 3.5 |
| 2024 | 17.1°C | 15.1°C | 13.2°C | 22.2°C | 10.1°C | 62 mm | 76% | 2.7 m/s | 3.2 |
| 2023 | 15.7°C | 13.9°C | 12.1°C | 19.1°C | 9.5°C | 144 mm | 78% | 3.4 m/s | 2.9 |
| 2022 | 17.9°C | 15.5°C | 13.1°C | 22.0°C | 10.1°C | 3 mm | 71% | 2 m/s | 3.3 |
| 2021 | 17.7°C | 15.2°C | 12.7°C | 24.6°C | 9.5°C | 47 mm | 69% | 2.5 m/s | 3.4 |
| 2020 | 17.2°C | 15.1°C | 12.9°C | 21.7°C | 10.8°C | 7 mm | 76% | 2.1 m/s | 3.4 |
| 2019 | 17.2°C | 15.1°C | 13.0°C | 21.5°C | 9.9°C | 138 mm | 74% | 2.8 m/s | 3.1 |
| 2018 🔥 | 19.8°C | 17.3°C | 14.7°C | 25.5°C | 12.2°C | 53 mm | 67% | 2.2 m/s | 3.3 |
| 2017 | 15.8°C | 13.9°C | 12.1°C | 20.4°C | 9.3°C | 177 mm | 77% | 3.1 m/s | 2.9 |
| 2016 | 16.7°C | 14.8°C | 12.9°C | 19.6°C | 11.5°C | 105 mm | 76% | 2.8 m/s | 2.9 |
| 2015 | 19.1°C | 16.7°C | 14.3°C | 23.9°C | 10.2°C | 47 mm | 70% | 1.8 m/s | 3.2 |
| 2014 | 19.7°C | 17.1°C | 14.4°C | 23.8°C | 11.5°C | 3 mm | 64% | 1.6 m/s | 3.4 |
| 2013 | 16.6°C | 14.0°C | 11.3°C | 21.7°C | 7.0°C | 33 mm | 63% | 2.6 m/s | 3.4 |
| 2012 | 18.2°C | 15.5°C | 12.8°C | 23.4°C | 8.7°C | 19 mm | 66% | 2 m/s | 3.4 |
| 2011 | 17.2°C | 14.7°C | 12.2°C | 21.8°C | 8.0°C | 18 mm | 67% | 1.9 m/s | 3.4 |
| 2010 | 17.8°C | 15.4°C | 13.0°C | 21.8°C | 10.0°C | 130 mm | 70% | 2.7 m/s | 3 |
| 2009 | 18.5°C | 15.8°C | 13.0°C | 23.2°C | 9.8°C | 4 mm | 64% | 1.9 m/s | 3.4 |
| 2008 | 15.4°C | 13.3°C | 11.2°C | 20.0°C | 8.6°C | 120 mm | 73% | 3.3 m/s | 3 |
| 2007 | 16.0°C | 13.5°C | 10.9°C | 23.5°C | 7.5°C | 18 mm | 62% | 2.7 m/s | 3.4 |
| 2006 | 17.4°C | 14.8°C | 12.3°C | 25.4°C | 9.5°C | 25 mm | 69% | 2.8 m/s | 3.6 |
| 2005 | 16.9°C | 15.0°C | 13.1°C | 22.9°C | 8.9°C | 174 mm | 77% | 2.8 m/s | 2.9 |
| 2004 | 17.0°C | 14.7°C | 12.5°C | 21.4°C | 10.7°C | 10 mm | 70% | 2.3 m/s | 3.4 |
| 2003 | 20.2°C | 17.2°C | 14.3°C | 24.6°C | 10.8°C | 3 mm | 67% | 1.8 m/s | 3.4 |
| 2002 | 16.6°C | 14.1°C | 11.7°C | 21.5°C | 6.8°C | 12 mm | 68% | 2.6 m/s | 3.3 |
| 2001 | 15.8°C | 13.7°C | 11.6°C | 22.1°C | 9.1°C | 75 mm | 69% | 2.6 m/s | 3.1 |
| 2000 | 17.3°C | 15.0°C | 12.8°C | 22.2°C | 10.4°C | 18 mm | 75% | 2.3 m/s | 3.1 |
| 1999 | 17.0°C | 14.5°C | 12.0°C | 21.9°C | 9.6°C | 39 mm | 73% | 2.3 m/s | 3.2 |
| 1998 | 17.3°C | 15.5°C | 13.7°C | 21.2°C | 11.3°C | 69 mm | 76% | 2.8 m/s | 3 |
| 1997 | 16.5°C | 14.4°C | 12.2°C | 21.0°C | 9.2°C | 107 mm | 78% | 3.1 m/s | 2.8 |
| 1996 | 17.5°C | 15.0°C | 12.5°C | 23.5°C | 9.3°C | 57 mm | 70% | 2.8 m/s | 3.1 |
| 1995 | 15.6°C | 13.8°C | 12.0°C | 20.1°C | 9.6°C | 233 mm | 81% | 3.7 m/s | 2.6 |
| 1994 | 18.6°C | 15.7°C | 12.7°C | 23.4°C | 9.9°C | 23 mm | 62% | 2.5 m/s | 3.5 |
| 1993 🌧️ | 15.8°C | 14.0°C | 12.1°C | 19.5°C | 8.3°C | 334 mm | 79% | 3.8 m/s | 2.6 |
| 1992 | 17.8°C | 14.8°C | 11.8°C | 22.0°C | 8.7°C | 57 mm | 64% | 3.1 m/s | 3.3 |
| 1991 | 17.3°C | 14.6°C | 12.0°C | 21.5°C | 10.2°C | 26 mm | 70% | 2.4 m/s | 3.3 |
| 1990 | 17.5°C | 14.8°C | 12.1°C | 21.9°C | 9.2°C | 68 mm | 65% | 3.1 m/s | 3.4 |
| 1989 ❄️ | 16.0°C | 13.1°C | 10.1°C | 20.7°C | 7.0°C | 17 mm | 64% | 2.9 m/s | 3.3 |
| 1988 | 16.5°C | 13.9°C | 11.4°C | 20.9°C | 7.2°C | 52 mm | 68% | 3.4 m/s | 3 |
| 1987 | 16.8°C | 14.1°C | 11.4°C | 23.2°C | 6.0°C | 51 mm | 64% | 3.4 m/s | 3.2 |
| 1986 | 19.1°C | 16.3°C | 13.5°C | 23.1°C | 11.3°C | 32 mm | 72% | 2.5 m/s | 3 |
| 1985 | 15.7°C | 13.2°C | 10.6°C | 17.7°C | 7.0°C | 25 mm | 70% | 3.1 m/s | 3.2 |
| 1984 | 18.6°C | 15.6°C | 12.7°C | 22.8°C | 10.4°C | 6 mm | 64% | 2.9 m/s | 3.2 |
| 1983 | 18.1°C | 15.5°C | 13.0°C | 23.6°C | 9.9°C | 72 mm | 67% | 3 m/s | — |
| 1982 | 15.9°C | 13.3°C | 10.6°C | 20.2°C | 7.3°C | 93 mm | 67% | 3.6 m/s | — |
| 1981 | 18.2°C | 15.6°C | 13.1°C | 22.7°C | 7.5°C | 37 mm | 67% | 2.7 m/s | — |
Actual recorded January data for each year, 1981–2025 — sourced from NASA POWER.
The average high in January is around 17.3°C with lows near 12.4°C (mean 14.9°C), based on 45 years of NASA POWER data.
January averages 64 mm of rainfall in Oceanside, a relatively wet time of year. The wettest on record was 334 mm in 1993.
The hottest January reached 25.5°C in 2018. The coldest dipped to 6°C in 1987.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average January temperatures have risen by about 0.3°C — but days and nights have moved in opposite directions. Overnight lows rose from 12°C to 12.6°C while daytime highs eased from 17.3°C to 17.1°C, narrowing the gap between day and night.
January is one of the cooler months of the year in Oceanside and a relatively wet time of year, so plan for around 17.3°C daytime highs and 12.4°C at night.
Not quite — January is the 2nd coolest month in Oceanside, averaging 14.9°C.
For January in Oceanside, pack light layers you can adjust through the day, with typical highs of 17.3°C and lows of 12.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in January averages 70% — moderately humid.
Average wind speed in January is 2.7 m/s. The windiest January on record averaged 3.8 m/s (1993).
The wettest January on record was 1993 with 334 mm. On average, January sees 64 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 January, 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 January specifically, along with year-by-year records and how the month has changed over the decades.
