January is one of the cooler months of the year in Pasadena, with average highs near 16.1°C and lows around 8.1°C (mean 12.1°C). It is about average for rainfall, averaging 114 mm of rainfall and 82% relative humidity across the period.
January is one of the cooler months of the year in Pasadena. Across 45 years of records, the warmest January in Pasadena was 1989 — when the month averaged 15.3°C — while the coldest was 1985 at 8.9°C. Typical January days reach 16.1°C with nights near 8.1°C. The long-term trend is warming, about 0.2°C per decade.
January is about average for rainfall in Pasadena, averaging 114 mm of rainfall. The wettest January on record was 1991 with 278 mm, while the driest was 2009 at 11 mm.
Relative humidity in Pasadena during January averages 82%. The most humid January was 1998 at 88%, and the least humid was 2022 at 75%.
January receives about 2.9 kWh/m²/day of solar energy in Pasadena. The sunniest January was 2009 at 3.4 kWh/m²/day, and the cloudiest was 1993 at 2.2.
Average wind speed in Pasadena during January is 3.6 m/s. The windiest January was 1994 at 4.2 m/s, while the calmest was 1981 at 3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 11.2°C | 12.6°C | 12.4°C | 11.7°C | 12.6°C | +1.4°C |
| Avg High | 15.2°C | 16.4°C | 16.4°C | 15.8°C | 16.8°C | +1.6°C |
| Avg Low | 7.2°C | 8.8°C | 8.5°C | 7.5°C | 8.4°C | +1.2°C |
| Avg Rain | 88 mm | 148 mm | 90 mm | 116 mm | 129 mm | +41 mm |
January temperatures in Pasadena have risen by about 1.9°C between 1981–1985 and 2021–2025.
January has ranged from a record low of -5.8°C (1982) to a record high of 26.5°C (2022).
Rainfall in January is about average for rainfall, averaging 114 mm, with a wettest year of 278 mm.
A quieter season to visit Pasadena
If your dates are flexible, the more temperate months of April and October tend to be the most comfortable for visiting Pasadena. That said, January — with days averaging 16.1°C and nights around 8.1°C (mean 12.1°C) and higher rainfall (114 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 | 14.2°C | 10.2°C | 6.2°C | 23.4°C | -3.1°C | 119 mm | 80% | 3.9 m/s | 2.5 |
| 2024 | 15.6°C | 11.2°C | 6.8°C | 21.6°C | -4.5°C | 235 mm | 81% | 3.9 m/s | 3 |
| 2023 | 18.9°C | 14.9°C | 10.9°C | 23.5°C | 3.3°C | 158 mm | 84% | 3.7 m/s | 2.8 |
| 2022 | 17.1°C | 12.2°C | 7.3°C | 26.5°C | 0.6°C | 58 mm | 75% | 3.8 m/s | 3.2 |
| 2021 | 16.7°C | 12.5°C | 8.3°C | 22.3°C | 1.5°C | 53 mm | 81% | 3.6 m/s | 3.2 |
| 2020 | 18.5°C | 14.7°C | 11.0°C | 23.2°C | 4.9°C | 153 mm | 83% | 3.4 m/s | 2.7 |
| 2019 | 16.0°C | 11.9°C | 7.8°C | 21.7°C | 0.7°C | 183 mm | 84% | 3.5 m/s | 3.1 |
| 2018 | 13.5°C | 9.2°C | 4.9°C | 19.3°C | -5.1°C | 162 mm | 79% | 3.5 m/s | 3.1 |
| 2017 | 18.8°C | 15.0°C | 11.1°C | 23.0°C | -3.7°C | 111 mm | 84% | 3.7 m/s | 3.1 |
| 2016 | 16.2°C | 12.0°C | 7.7°C | 21.9°C | 1.5°C | 92 mm | 82% | 3.4 m/s | 3.2 |
| 2015 | 14.5°C | 10.5°C | 6.5°C | 21.6°C | -0.2°C | 141 mm | 83% | 3.3 m/s | 2.8 |
| 2014 | 15.0°C | 10.2°C | 5.5°C | 20.9°C | -1.9°C | 30 mm | 77% | 3.7 m/s | 3.2 |
| 2013 | 16.7°C | 13.1°C | 9.5°C | 22.7°C | 1.5°C | 145 mm | 84% | 3.6 m/s | 2.8 |
| 2012 | 18.5°C | 14.3°C | 10.1°C | 22.4°C | 1.8°C | 124 mm | 82% | 3.5 m/s | 3.1 |
| 2011 | 15.3°C | 10.7°C | 6.1°C | 20.6°C | -1.4°C | 99 mm | 79% | 3.5 m/s | 2.8 |
| 2010 | 13.8°C | 9.8°C | 5.7°C | 20.8°C | -3.6°C | 73 mm | 83% | 3.5 m/s | 2.8 |
| 2009 | 17.4°C | 12.6°C | 7.8°C | 23.6°C | 2.2°C | 11 mm | 76% | 3.4 m/s | 3.4 |
| 2008 | 15.4°C | 11.5°C | 7.7°C | 22.3°C | 0.9°C | 159 mm | 81% | 4 m/s | 2.8 |
| 2007 | 14.5°C | 11.2°C | 7.9°C | 21.5°C | 0.9°C | 169 mm | 86% | 3.7 m/s | 2.4 |
| 2006 | 19.7°C | 15.2°C | 10.8°C | 23.8°C | 4.9°C | 48 mm | 75% | 3.7 m/s | 3.3 |
| 2005 | 17.1°C | 13.5°C | 9.9°C | 22.5°C | 2.0°C | 63 mm | 86% | 3.6 m/s | 2.8 |
| 2004 | 16.1°C | 12.7°C | 9.3°C | 21.5°C | 0.9°C | 148 mm | 84% | 3.5 m/s | 2.5 |
| 2003 | 14.0°C | 10.2°C | 6.4°C | 21.0°C | -0.9°C | 56 mm | 84% | 3.5 m/s | 3 |
| 2002 | 17.1°C | 12.9°C | 8.6°C | 22.7°C | -2.3°C | 60 mm | 84% | 3.6 m/s | 2.9 |
| 2001 | 13.8°C | 10.1°C | 6.4°C | 19.7°C | -1.9°C | 145 mm | 85% | 3.4 m/s | 2.7 |
| 2000 | 18.6°C | 14.4°C | 10.2°C | 24.9°C | 0.5°C | 41 mm | 78% | 4 m/s | 2.9 |
| 1999 | 18.0°C | 14.1°C | 10.2°C | 22.8°C | -1.3°C | 59 mm | 84% | 4.1 m/s | 3.3 |
| 1998 | 18.1°C | 14.4°C | 10.7°C | 21.4°C | 4.7°C | 173 mm | 88% | 3.6 m/s | 3.1 |
| 1997 | 14.5°C | 10.9°C | 7.3°C | 23.9°C | -0.5°C | 125 mm | 84% | 3.8 m/s | 2.5 |
| 1996 | 16.0°C | 11.3°C | 6.6°C | 22.3°C | -3.6°C | 68 mm | 80% | 4 m/s | 2.9 |
| 1995 | 16.4°C | 12.3°C | 8.2°C | 21.9°C | 1.8°C | 123 mm | 83% | 3.9 m/s | 3 |
| 1994 | 15.6°C | 11.7°C | 7.9°C | 21.0°C | -0.2°C | 85 mm | 83% | 4.2 m/s | 2.8 |
| 1993 | 16.5°C | 12.9°C | 9.2°C | 22.4°C | 2.8°C | 199 mm | 85% | 3.3 m/s | 2.2 |
| 1992 | 15.3°C | 11.9°C | 8.6°C | 21.1°C | -0.4°C | 226 mm | 83% | 3.2 m/s | 2.6 |
| 1991 🌧️ | 15.6°C | 11.9°C | 8.2°C | 22.5°C | 2.6°C | 278 mm | 85% | 3.7 m/s | 2.4 |
| 1990 | 18.0°C | 14.3°C | 10.6°C | 22.7°C | 3.8°C | 148 mm | 81% | 3.7 m/s | 2.8 |
| 1989 🔥 | 18.9°C | 15.3°C | 11.6°C | 25.7°C | 4.5°C | 175 mm | 85% | 3.6 m/s | 2.3 |
| 1988 | 14.3°C | 10.2°C | 6.2°C | 21.7°C | -0.3°C | 59 mm | 80% | 4 m/s | 2.8 |
| 1987 | 14.7°C | 10.9°C | 7.2°C | 20.1°C | 0.3°C | 98 mm | 84% | 3.5 m/s | 2.9 |
| 1986 | 16.7°C | 12.6°C | 8.5°C | 22.3°C | 2.2°C | 34 mm | 80% | 3.3 m/s | 3.3 |
| 1985 ❄️ | 13.2°C | 8.9°C | 4.6°C | 21.6°C | -5.1°C | 87 mm | 81% | 3.6 m/s | 2.9 |
| 1984 | 13.1°C | 9.4°C | 5.6°C | 19.5°C | -2.7°C | 117 mm | 84% | 3.6 m/s | 2.7 |
| 1983 | 14.7°C | 10.8°C | 6.8°C | 20.8°C | 2.3°C | 97 mm | 83% | 3.3 m/s | — |
| 1982 | 16.0°C | 11.6°C | 7.3°C | 22.7°C | -5.8°C | 51 mm | 82% | 3.8 m/s | — |
| 1981 | 15.1°C | 10.8°C | 6.6°C | 20.0°C | 2.2°C | 75 mm | 77% | 3 m/s | — |
Actual recorded January data for each year, 1981–2025 — sourced from NASA POWER.
The average high in January is around 16.1°C with lows near 8.1°C (mean 12.1°C), based on 45 years of NASA POWER data.
January averages 114 mm of rainfall in Pasadena, about average for rainfall. The wettest on record was 278 mm in 1991.
The hottest January reached 26.5°C in 2022. The coldest dipped to -5.8°C in 1982.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average January temperatures have risen by about 1.9°C. Daytime highs moved from 14.4°C to 16.5°C and overnight lows from 6.2°C to 7.9°C over the same span.
January is one of the cooler months of the year in Pasadena and about average for rainfall, so plan for around 16.1°C daytime highs and 8.1°C at night.
Yes — January is the coldest month of the year in Pasadena, averaging 12.1°C.
For January in Pasadena, pack light layers you can adjust through the day, with typical highs of 16.1°C and lows of 8.1°C. Bring an umbrella or light rain jacket too.
Relative humidity in January averages 82% — quite humid.
Average wind speed in January is 3.6 m/s. The windiest January on record averaged 4.2 m/s (1994).
The wettest January on record was 1991 with 278 mm. On average, January sees 114 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 Pasadena 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.
