January is one of the cooler months of the year in Chula Vista, with average highs near 17.6°C and lows around 8.5°C (mean 13.1°C). It is a relatively wet time of year, averaging 51 mm of rainfall and 64% relative humidity across the period.
January is one of the cooler months of the year in Chula Vista. Across 45 years of records, the warmest January in Chula Vista was 2003 — when the month averaged 16.4°C — while the coldest was 1985 at 10.8°C. Typical January days reach 17.6°C with nights near 8.5°C. The long-term trend is warming, about 0.2°C per decade.
January is a relatively wet time of year in Chula Vista, averaging 51 mm of rainfall. The wettest January on record was 1993 with 365 mm, while the driest was 2009 at 2 mm.
Relative humidity in Chula Vista during January averages 64%. The most humid January was 1993 at 80%, and the least humid was 2014 at 50%.
January receives about 3.2 kWh/m²/day of solar energy in Chula Vista. The sunniest January was 2006 at 3.6 kWh/m²/day, and the cloudiest was 1993 at 2.6.
Average wind speed in Chula Vista during January is 2.6 m/s. The windiest January was 1993 at 3.6 m/s, while the calmest were 2014, 2015 and 2020, among others at 2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 12.5°C | 12.9°C | 13.0°C | 13.7°C | 13.1°C | +0.6°C |
| Avg High | 17.2°C | 17.3°C | 17.7°C | 18.4°C | 17.5°C | +0.3°C |
| Avg Low | 7.9°C | 8.5°C | 8.4°C | 9.0°C | 8.6°C | +0.7°C |
| Avg Rain | 35 mm | 84 mm | 28 mm | 55 mm | 50 mm | +15 mm |
January temperatures in Chula Vista have risen by about 0.4°C between 1981–1985 and 2021–2025.
January has ranged from a record low of -0.3°C (2007) to a record high of 27.6°C (2003).
Rainfall in January is a relatively wet time of year, averaging 51 mm, with a wettest year of 365 mm.
A quieter season to visit Chula Vista
If your dates are flexible, the more temperate months of July and September tend to be the most comfortable for visiting Chula Vista. That said, January — with days averaging 17.6°C and nights around 8.5°C (mean 13.1°C) and moderate rainfall (51 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 | 17.6°C | 12.8°C | 8.0°C | 24.0°C | 5.2°C | 14 mm | 53% | 2.6 m/s | 3.5 |
| 2024 | 17.2°C | 13.0°C | 8.8°C | 23.2°C | 3.6°C | 77 mm | 73% | 2.2 m/s | 3.2 |
| 2023 | 15.3°C | 11.6°C | 8.0°C | 20.2°C | 3.0°C | 147 mm | 75% | 3.1 m/s | 3 |
| 2022 | 18.6°C | 13.8°C | 9.0°C | 22.4°C | 3.7°C | 7 mm | 62% | 2.2 m/s | 3.2 |
| 2021 | 18.5°C | 13.8°C | 9.0°C | 27.3°C | 3.8°C | 47 mm | 59% | 2.7 m/s | 3.4 |
| 2020 | 18.0°C | 13.4°C | 8.7°C | 21.8°C | 6.0°C | 8 mm | 69% | 2 m/s | 3.4 |
| 2019 | 17.5°C | 13.0°C | 8.6°C | 23.0°C | 3.0°C | 67 mm | 69% | 2.5 m/s | 3.2 |
| 2018 | 21.1°C | 16.2°C | 11.4°C | 26.3°C | 5.4°C | 49 mm | 57% | 2.2 m/s | 3.2 |
| 2017 | 15.3°C | 11.8°C | 8.2°C | 22.4°C | 3.2°C | 128 mm | 76% | 2.8 m/s | 3 |
| 2016 | 16.6°C | 12.7°C | 8.7°C | 21.9°C | 4.1°C | 92 mm | 74% | 2.4 m/s | 2.9 |
| 2015 | 19.7°C | 14.7°C | 9.7°C | 24.6°C | 1.9°C | 23 mm | 62% | 2 m/s | 3.2 |
| 2014 | 21.6°C | 16.3°C | 10.9°C | 26.2°C | 7.5°C | 3 mm | 50% | 2 m/s | 3.2 |
| 2013 | 16.6°C | 11.7°C | 6.8°C | 24.1°C | 0.9°C | 41 mm | 58% | 2.5 m/s | 3.5 |
| 2012 | 19.4°C | 14.1°C | 8.9°C | 26.4°C | 5.1°C | 12 mm | 58% | 2.1 m/s | 3.3 |
| 2011 | 17.8°C | 12.9°C | 8.0°C | 25.7°C | 2.2°C | 12 mm | 61% | 2.5 m/s | 3.5 |
| 2010 | 18.0°C | 13.5°C | 8.9°C | 22.5°C | 4.7°C | 118 mm | 67% | 2.5 m/s | 3 |
| 2009 | 19.0°C | 14.0°C | 8.9°C | 24.0°C | 3.9°C | 2 mm | 60% | 2.5 m/s | 3.4 |
| 2008 | 15.4°C | 11.3°C | 7.2°C | 22.0°C | 3.9°C | 62 mm | 69% | 3.2 m/s | 3.2 |
| 2007 | 15.7°C | 10.9°C | 6.2°C | 24.1°C | -0.3°C | 15 mm | 55% | 2.8 m/s | 3.3 |
| 2006 | 18.3°C | 13.4°C | 8.5°C | 24.8°C | 3.1°C | 10 mm | 58% | 2.6 m/s | 3.6 |
| 2005 | 16.6°C | 12.9°C | 9.1°C | 23.3°C | 5.1°C | 96 mm | 77% | 2.6 m/s | 3 |
| 2004 | 17.6°C | 13.0°C | 8.4°C | 23.6°C | 4.8°C | 8 mm | 65% | 2.1 m/s | 3.2 |
| 2003 🔥 | 21.9°C | 16.4°C | 10.9°C | 27.6°C | 6.1°C | 3 mm | 57% | 2 m/s | 3.4 |
| 2002 | 17.3°C | 12.4°C | 7.4°C | 25.1°C | 1.8°C | 10 mm | 62% | 2.4 m/s | 3.3 |
| 2001 | 15.7°C | 11.6°C | 7.6°C | 22.4°C | 3.2°C | 61 mm | 67% | 2.3 m/s | 3.2 |
| 2000 | 19.0°C | 14.2°C | 9.4°C | 26.6°C | 4.4°C | 10 mm | 64% | 2.2 m/s | 3.1 |
| 1999 | 17.9°C | 13.1°C | 8.4°C | 23.2°C | 5.4°C | 29 mm | 63% | 2.3 m/s | 3.2 |
| 1998 | 17.7°C | 13.6°C | 9.5°C | 23.9°C | 5.3°C | 48 mm | 75% | 2.1 m/s | 3.1 |
| 1997 | 16.4°C | 12.5°C | 8.7°C | 23.3°C | 4.3°C | 73 mm | 75% | 2.8 m/s | 3.1 |
| 1996 | 18.4°C | 13.6°C | 8.9°C | 25.5°C | 5.0°C | 36 mm | 63% | 2.5 m/s | 3.2 |
| 1995 | 15.4°C | 11.9°C | 8.3°C | 22.1°C | 4.5°C | 128 mm | 80% | 3.3 m/s | 2.8 |
| 1994 | 19.5°C | 14.3°C | 9.0°C | 26.0°C | 4.6°C | 19 mm | 51% | 2.5 m/s | 3.5 |
| 1993 🌧️ | 14.9°C | 11.7°C | 8.5°C | 20.0°C | 1.5°C | 365 mm | 80% | 3.6 m/s | 2.6 |
| 1992 | 17.4°C | 12.4°C | 7.4°C | 24.2°C | 3.6°C | 50 mm | 59% | 3.5 m/s | 3.2 |
| 1991 | 18.0°C | 13.0°C | 7.9°C | 24.0°C | 4.0°C | 20 mm | 64% | 2.2 m/s | 3.1 |
| 1990 | 17.1°C | 12.5°C | 7.9°C | 25.7°C | 3.3°C | 67 mm | 60% | 3 m/s | 3.4 |
| 1989 | 16.0°C | 11.1°C | 6.1°C | 22.4°C | 1.9°C | 16 mm | 60% | 3.1 m/s | 3.3 |
| 1988 | 16.3°C | 11.8°C | 7.3°C | 21.3°C | 1.7°C | 49 mm | 63% | 3.3 m/s | 3.1 |
| 1987 | 16.6°C | 11.8°C | 7.1°C | 25.7°C | 0.2°C | 39 mm | 61% | 3 m/s | 3.2 |
| 1986 | 19.8°C | 15.1°C | 10.3°C | 25.0°C | 6.4°C | 29 mm | 65% | 2.7 m/s | 3 |
| 1985 ❄️ | 15.2°C | 10.8°C | 6.4°C | 20.3°C | 1.4°C | 22 mm | 68% | 3 m/s | 3.1 |
| 1984 | 18.6°C | 13.5°C | 8.5°C | 24.0°C | 4.8°C | 7 mm | 59% | 3.2 m/s | 3.1 |
| 1983 | 17.8°C | 13.4°C | 8.9°C | 23.5°C | 2.7°C | 51 mm | 65% | 3.1 m/s | — |
| 1982 | 15.6°C | 11.0°C | 6.3°C | 22.2°C | 1.9°C | 75 mm | 65% | 3.3 m/s | — |
| 1981 | 19.0°C | 14.4°C | 9.8°C | 23.8°C | 3.3°C | 28 mm | 60% | 2.2 m/s | — |
Actual recorded January data for each year, 1981–2025 — sourced from NASA POWER.
The average high in January is around 17.6°C with lows near 8.5°C (mean 13.1°C), based on 45 years of NASA POWER data.
January averages 51 mm of rainfall in Chula Vista, a relatively wet time of year. The wettest on record was 365 mm in 1993.
The hottest January reached 27.6°C in 2003. The coldest dipped to -0.3°C in 2007.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average January temperatures have risen by about 0.4°C. Daytime highs moved from 17.2°C to 17.4°C and overnight lows from 8°C to 8.6°C over the same span.
January is one of the cooler months of the year in Chula Vista and a relatively wet time of year, so plan for around 17.6°C daytime highs and 8.5°C at night.
Yes — January is the coldest month of the year in Chula Vista, averaging 13.1°C.
For January in Chula Vista, pack light layers you can adjust through the day, with typical highs of 17.6°C and lows of 8.5°C. Bring an umbrella or light rain jacket too.
Relative humidity in January averages 64% — moderately humid.
Average wind speed in January is 2.6 m/s. The windiest January on record averaged 3.6 m/s (1993).
The wettest January on record was 1993 with 365 mm. On average, January sees 51 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 Chula Vista 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.
