April is close to Pasadena's year-round average, with average highs near 24.6°C and lows around 17°C (mean 20.8°C). It is one of the drier months, averaging 89 mm of rainfall and 80% relative humidity across the period.
April is close to Pasadena's year-round average. Across 45 years of records, the warmest April in Pasadena was 2006 — when the month averaged 23.3°C — while the coldest was 1983 at 17.8°C. Typical April days reach 24.6°C with nights near 17°C. The long-term trend is warming, about 0.4°C per decade.
April is one of the drier months in Pasadena, averaging 89 mm of rainfall. The wettest April on record was 2009 with 272 mm, while the driest was 1987 at 6 mm.
Relative humidity in Pasadena during April averages 80%. The most humid April was 2015 at 88%, and the least humid was 1987 at 72%.
April receives about 5.3 kWh/m²/day of solar energy in Pasadena. The sunniest April was 1987 at 6.3 kWh/m²/day, and the cloudiest was 2015 at 4.3.
Average wind speed in Pasadena during April is 3.8 m/s. The windiest April was 2011 at 4.7 m/s, while the calmest was 1987 at 2.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 20.3°C | 20.1°C | 21.0°C | 21.1°C | 21.9°C | +1.6°C |
| Avg High | 24.4°C | 23.8°C | 24.6°C | 24.9°C | 25.7°C | +1.3°C |
| Avg Low | 16.1°C | 16.4°C | 17.3°C | 17.3°C | 18.1°C | +2°C |
| Avg Rain | 46 mm | 108 mm | 92 mm | 99 mm | 97 mm | +51 mm |
April temperatures in Pasadena have risen by about 1.5°C between 1981–1985 and 2021–2025.
April has ranged from a record low of 3.1°C (1987) to a record high of 32.7°C (2011).
Rainfall in April is one of the drier months, averaging 89 mm, with a wettest year of 272 mm.
One of the best times to visit Pasadena
April is one of the best times to visit Pasadena. Expect days averaging 24.6°C and nights around 17°C (mean 20.8°C) — close to Pasadena's yearly average — with higher rainfall (89 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 26.7°C | 23.0°C | 19.3°C | 29.3°C | 8.4°C | 74 mm | 80% | 4.3 m/s | 5.4 |
| 2024 | 25.6°C | 22.1°C | 18.7°C | 28.0°C | 11.8°C | 122 mm | 83% | 4 m/s | 4.9 |
| 2023 | 24.6°C | 20.8°C | 17.0°C | 28.9°C | 12.6°C | 185 mm | 81% | 3.6 m/s | 4.8 |
| 2022 | 26.8°C | 22.7°C | 18.7°C | 29.6°C | 10.1°C | 37 mm | 75% | 4.4 m/s | 5.4 |
| 2021 | 24.9°C | 21.1°C | 17.2°C | 29.9°C | 10.3°C | 74 mm | 76% | 3.9 m/s | 4.7 |
| 2020 | 25.9°C | 21.9°C | 17.9°C | 30.8°C | 11.0°C | 92 mm | 78% | 3.7 m/s | 5.1 |
| 2019 | 24.1°C | 20.2°C | 16.4°C | 28.3°C | 7.0°C | 99 mm | 81% | 4 m/s | 5.4 |
| 2018 | 23.9°C | 19.8°C | 15.6°C | 27.6°C | 9.0°C | 66 mm | 75% | 3.8 m/s | 5.6 |
| 2017 | 25.4°C | 21.8°C | 18.2°C | 29.0°C | 11.8°C | 78 mm | 79% | 4 m/s | 5.7 |
| 2016 | 25.0°C | 21.5°C | 18.1°C | 27.8°C | 11.0°C | 251 mm | 82% | 3.5 m/s | 5.1 |
| 2015 | 24.8°C | 21.9°C | 19.0°C | 28.4°C | 12.5°C | 243 mm | 88% | 3 m/s | 4.3 |
| 2014 | 24.6°C | 20.3°C | 16.0°C | 31.5°C | 6.9°C | 24 mm | 77% | 4 m/s | 5.4 |
| 2013 | 23.4°C | 19.2°C | 15.1°C | 26.3°C | 7.8°C | 119 mm | 81% | 3.9 m/s | 4.9 |
| 2012 | 25.8°C | 22.3°C | 18.9°C | 27.2°C | 13.0°C | 81 mm | 80% | 3.7 m/s | 6 |
| 2011 | 27.7°C | 23.2°C | 18.7°C | 32.7°C | 9.9°C | 8 mm | 73% | 4.7 m/s | 5.7 |
| 2010 | 23.9°C | 20.3°C | 16.6°C | 28.0°C | 10.2°C | 26 mm | 81% | 3.7 m/s | 5.3 |
| 2009 🌧️ | 23.9°C | 20.1°C | 16.2°C | 28.2°C | 6.5°C | 272 mm | 77% | 4.5 m/s | 5.3 |
| 2008 | 24.9°C | 20.8°C | 16.8°C | 27.3°C | 8.6°C | 49 mm | 76% | 3.8 m/s | 5.5 |
| 2007 | 22.6°C | 18.9°C | 15.3°C | 26.9°C | 4.0°C | 118 mm | 83% | 3.5 m/s | 4.9 |
| 2006 🔥 | 27.4°C | 23.3°C | 19.3°C | 30.8°C | 13.7°C | 56 mm | 77% | 3.6 m/s | 5.8 |
| 2005 | 23.7°C | 19.8°C | 15.9°C | 26.9°C | 9.9°C | 34 mm | 77% | 3.8 m/s | 5.8 |
| 2004 | 23.8°C | 20.6°C | 17.3°C | 26.5°C | 9.0°C | 109 mm | 83% | 3.6 m/s | 5.1 |
| 2003 | 23.8°C | 20.4°C | 17.0°C | 27.2°C | 5.8°C | 38 mm | 84% | 3.5 m/s | 5 |
| 2002 | 25.6°C | 22.4°C | 19.3°C | 30.9°C | 12.6°C | 90 mm | 85% | 3.6 m/s | 5.2 |
| 2001 | 25.0°C | 22.0°C | 18.9°C | 27.7°C | 13.2°C | 41 mm | 84% | 3.9 m/s | 5.1 |
| 2000 | 25.4°C | 21.3°C | 17.1°C | 29.8°C | 9.5°C | 111 mm | 76% | 3.5 m/s | 5.6 |
| 1999 | 26.3°C | 22.5°C | 18.8°C | 31.1°C | 9.5°C | 24 mm | 79% | 4.1 m/s | 5.3 |
| 1998 | 23.8°C | 19.5°C | 15.2°C | 28.2°C | 10.7°C | 23 mm | 76% | 3.7 m/s | 5.8 |
| 1997 | 22.0°C | 18.3°C | 14.7°C | 26.5°C | 7.5°C | 182 mm | 83% | 4.2 m/s | 4.7 |
| 1996 | 24.3°C | 19.7°C | 15.0°C | 28.4°C | 6.8°C | 61 mm | 76% | 4.1 m/s | 5.7 |
| 1995 | 23.6°C | 20.1°C | 16.5°C | 27.0°C | 9.7°C | 100 mm | 83% | 3.7 m/s | 5.4 |
| 1994 | 24.0°C | 20.5°C | 17.1°C | 28.1°C | 7.7°C | 89 mm | 83% | 3.8 m/s | 5 |
| 1993 | 22.1°C | 18.2°C | 14.2°C | 26.0°C | 8.4°C | 137 mm | 82% | 4 m/s | 5.4 |
| 1992 | 23.5°C | 20.0°C | 16.5°C | 27.2°C | 9.3°C | 138 mm | 83% | 3 m/s | 5.2 |
| 1991 | 25.0°C | 22.2°C | 19.4°C | 28.3°C | 11.0°C | 212 mm | 87% | 3.6 m/s | 4.4 |
| 1990 | 23.6°C | 20.2°C | 16.8°C | 27.5°C | 9.1°C | 116 mm | 84% | 3.9 m/s | 5.1 |
| 1989 | 24.6°C | 20.6°C | 16.6°C | 28.3°C | 9.1°C | 39 mm | 78% | 3.7 m/s | 5.3 |
| 1988 | 24.1°C | 19.7°C | 15.3°C | 29.2°C | 6.3°C | 88 mm | 77% | 3.5 m/s | 5.4 |
| 1987 | 24.4°C | 18.9°C | 13.3°C | 30.8°C | 3.1°C | 6 mm | 72% | 2.9 m/s | 6.3 |
| 1986 | 25.2°C | 21.5°C | 17.8°C | 28.4°C | 13.0°C | 55 mm | 77% | 3.7 m/s | 4.7 |
| 1985 | 24.0°C | 20.8°C | 17.5°C | 27.6°C | 9.8°C | 62 mm | 82% | 3.9 m/s | 5 |
| 1984 | 24.8°C | 20.3°C | 15.7°C | 28.9°C | 7.5°C | 12 mm | 74% | 4 m/s | 5.6 |
| 1983 ❄️ | 22.1°C | 17.8°C | 13.5°C | 26.2°C | 7.3°C | 14 mm | 79% | 4.3 m/s | — |
| 1982 | 24.0°C | 20.2°C | 16.3°C | 29.5°C | 8.4°C | 84 mm | 82% | 3.8 m/s | — |
| 1981 | 26.4°C | 22.7°C | 19.0°C | 30.5°C | 11.2°C | 54 mm | 79% | 3.4 m/s | — |
Actual recorded April data for each year, 1981–2025 — sourced from NASA POWER.
The average high in April is around 24.6°C with lows near 17°C (mean 20.8°C), based on 45 years of NASA POWER data.
April averages 89 mm of rainfall in Pasadena, one of the drier months. The wettest on record was 272 mm in 2009.
The hottest April reached 32.7°C in 2011. The coldest dipped to 3.1°C in 1987.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average April temperatures have risen by about 1.5°C. Daytime highs moved from 24.3°C to 25.7°C and overnight lows from 16.4°C to 18.2°C over the same span.
April is close to Pasadena's year-round average and one of the drier months, so plan for around 24.6°C daytime highs and 17°C at night.
Not quite — April is the 6th coolest month in Pasadena, averaging 20.8°C.
For April in Pasadena, pack light layers you can adjust through the day, with typical highs of 24.6°C and lows of 17°C. Bring an umbrella or light rain jacket too.
Relative humidity in April averages 80% — quite humid.
Average wind speed in April is 3.8 m/s. The windiest April on record averaged 4.7 m/s (2011).
The wettest April on record was 2009 with 272 mm. On average, April sees 89 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 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.
