April is one of the cooler months of the year in Santa Rosa, with average highs near 18.7°C and lows around 6.3°C (mean 12.5°C). It is one of the drier months, averaging 41 mm of rainfall and 76% relative humidity across the period.
April is one of the cooler months of the year in Santa Rosa. Across 45 years of records, the warmest April in Santa Rosa was 1990 — when the month averaged 15.5°C — while the coldest was 2003 at 9.4°C. Typical April days reach 18.7°C with nights near 6.3°C. The long-term trend is warming, about 0.2°C per decade.
April is one of the drier months in Santa Rosa, averaging 41 mm of rainfall. The wettest April on record was 2006 with 147 mm, while the driest was 2021 at 4 mm.
Relative humidity in Santa Rosa during April averages 76%. The most humid April was 2006 at 86%, and the least humid was 2021 at 62%.
April receives about 6.1 kWh/m²/day of solar energy in Santa Rosa. The sunniest April was 2021 at 7 kWh/m²/day, and the cloudiest was 2006 at 4.8.
Average wind speed in Santa Rosa during April is 1.7 m/s. The windiest April was 2022 at 2.1 m/s, while the calmest was 1989 at 1.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 12.4°C | 12.5°C | 11.9°C | 12.8°C | 13.5°C | +1.1°C |
| Avg High | 18.7°C | 18.6°C | 18.0°C | 18.8°C | 20.3°C | +1.6°C |
| Avg Low | 6.2°C | 6.4°C | 5.9°C | 6.8°C | 6.7°C | +0.5°C |
| Avg Rain | 42 mm | 42 mm | 48 mm | 48 mm | 19 mm | -23 mm |
April temperatures in Santa Rosa have risen by about 1.6°C between 1981–1985 and 2021–2025.
April has ranged from a record low of -2.4°C (1999) to a record high of 31.2°C (1981).
Rainfall in April is one of the drier months, averaging 41 mm, with a wettest year of 147 mm.
A good time to visit Santa Rosa
April is a good time to visit Santa Rosa, with days averaging 18.7°C and nights around 6.3°C (mean 12.5°C, cooler than Santa Rosa's yearly average) and moderate rainfall. September and July are marginally more temperate, but April still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 19.5°C | 13.4°C | 7.2°C | 25.6°C | 2.4°C | 9 mm | 79% | 1.5 m/s | 6.1 |
| 2024 | 19.3°C | 13.0°C | 6.7°C | 25.1°C | 1.8°C | 29 mm | 78% | 1.5 m/s | 6.2 |
| 2023 | 18.5°C | 11.9°C | 5.3°C | 27.6°C | -0.9°C | 8 mm | 77% | 1.7 m/s | 6.8 |
| 2022 | 20.0°C | 13.1°C | 6.2°C | 28.5°C | 1.4°C | 37 mm | 67% | 2.1 m/s | 6.4 |
| 2021 | 23.1°C | 15.0°C | 6.8°C | 29.9°C | 4.4°C | 4 mm | 62% | 1.7 m/s | 7 |
| 2020 | 21.5°C | 14.6°C | 7.7°C | 30.6°C | 2.5°C | 27 mm | 70% | 1.7 m/s | 6.2 |
| 2019 | 19.8°C | 14.3°C | 8.9°C | 28.3°C | 4.5°C | 18 mm | 81% | 1.6 m/s | 5.9 |
| 2018 | 18.6°C | 12.4°C | 6.3°C | 25.5°C | 0.8°C | 76 mm | 77% | 1.7 m/s | 5.9 |
| 2017 | 17.3°C | 12.0°C | 6.7°C | 24.5°C | 1.5°C | 84 mm | 80% | 1.7 m/s | 5.5 |
| 2016 | 19.5°C | 13.7°C | 7.8°C | 25.4°C | 3.7°C | 28 mm | 75% | 1.8 m/s | 6.2 |
| 2015 | 20.1°C | 13.4°C | 6.8°C | 28.4°C | 2.6°C | 36 mm | 71% | 1.7 m/s | 6.7 |
| 2014 | 20.6°C | 14.0°C | 7.4°C | 30.2°C | 3.2°C | 37 mm | 73% | 1.6 m/s | 6.3 |
| 2013 | 21.4°C | 14.6°C | 7.8°C | 29.4°C | 3.0°C | 22 mm | 68% | 1.9 m/s | 6.7 |
| 2012 | 18.2°C | 12.2°C | 6.3°C | 28.5°C | -1.0°C | 55 mm | 79% | 1.6 m/s | 6.1 |
| 2011 | 16.6°C | 10.8°C | 5.0°C | 24.0°C | -0.6°C | 11 mm | 79% | 1.8 m/s | 6.2 |
| 2010 | 15.5°C | 10.1°C | 4.7°C | 24.1°C | 1.2°C | 111 mm | 81% | 1.8 m/s | 5.6 |
| 2009 | 19.1°C | 12.2°C | 5.4°C | 30.7°C | 0.4°C | 17 mm | 72% | 1.7 m/s | 6.6 |
| 2008 | 18.2°C | 11.2°C | 4.3°C | 27.0°C | -0.9°C | 4 mm | 71% | 1.7 m/s | 6.9 |
| 2007 | 20.2°C | 13.3°C | 6.3°C | 29.3°C | 1.8°C | 44 mm | 72% | 1.7 m/s | 6.3 |
| 2006 🌧️ | 16.3°C | 11.7°C | 7.2°C | 25.1°C | 1.9°C | 147 mm | 86% | 1.5 m/s | 4.8 |
| 2005 | 17.2°C | 11.3°C | 5.4°C | 22.7°C | 1.2°C | 42 mm | 79% | 1.7 m/s | 6.3 |
| 2004 | 19.9°C | 13.6°C | 7.3°C | 30.6°C | 3.6°C | 13 mm | 75% | 1.7 m/s | 6.4 |
| 2003 ❄️ | 14.1°C | 9.4°C | 4.6°C | 20.3°C | 0.5°C | 120 mm | 84% | 1.7 m/s | 5.2 |
| 2002 | 18.2°C | 12.3°C | 6.4°C | 25.2°C | 0.9°C | 11 mm | 80% | 1.6 m/s | 5.8 |
| 2001 | 17.3°C | 11.1°C | 4.9°C | 26.2°C | -0.4°C | 30 mm | 76% | 1.6 m/s | 6.3 |
| 2000 | 19.1°C | 13.0°C | 6.9°C | 25.9°C | 3.3°C | 49 mm | 78% | 1.6 m/s | 6.1 |
| 1999 | 17.6°C | 11.3°C | 5.0°C | 24.7°C | -2.4°C | 52 mm | 74% | 2 m/s | 6.4 |
| 1998 | 16.4°C | 11.0°C | 5.5°C | 25.2°C | 0.4°C | 63 mm | 82% | 1.5 m/s | 5.8 |
| 1997 | 19.5°C | 13.0°C | 6.5°C | 24.3°C | 1.3°C | 16 mm | 74% | 1.8 m/s | 6.2 |
| 1996 | 18.9°C | 12.9°C | 6.8°C | 29.2°C | 2.5°C | 80 mm | 79% | 1.7 m/s | 5.9 |
| 1995 | 16.7°C | 11.1°C | 5.5°C | 22.4°C | 0.7°C | 80 mm | 81% | 1.8 m/s | 5.7 |
| 1994 | 19.3°C | 13.0°C | 6.6°C | 24.7°C | 2.6°C | 46 mm | 74% | 1.6 m/s | 5.9 |
| 1993 | 17.7°C | 12.0°C | 6.2°C | 24.2°C | 2.7°C | 32 mm | 80% | 1.7 m/s | 5.9 |
| 1992 | 20.1°C | 13.9°C | 7.7°C | 26.5°C | 2.1°C | 30 mm | 78% | 1.6 m/s | 6.1 |
| 1991 | 17.4°C | 11.2°C | 5.1°C | 21.7°C | 0.9°C | 15 mm | 75% | 1.7 m/s | 6.5 |
| 1990 🔥 | 22.3°C | 15.5°C | 8.6°C | 29.7°C | 5.3°C | 8 mm | 68% | 1.7 m/s | 5.9 |
| 1989 | 20.0°C | 13.9°C | 7.7°C | 27.2°C | 3.8°C | 26 mm | 76% | 1.4 m/s | 5.7 |
| 1988 | 19.3°C | 13.0°C | 6.6°C | 27.9°C | 3.2°C | 53 mm | 71% | 1.7 m/s | 5.4 |
| 1987 | 21.8°C | 14.5°C | 7.2°C | 28.6°C | 2.8°C | 5 mm | 67% | 1.6 m/s | 6.4 |
| 1986 | 17.9°C | 11.8°C | 5.6°C | 24.5°C | 1.4°C | 21 mm | 77% | 1.6 m/s | 6.2 |
| 1985 | 21.0°C | 14.2°C | 7.5°C | 26.6°C | 3.4°C | 6 mm | 72% | 1.6 m/s | 6.4 |
| 1984 | 17.2°C | 10.9°C | 4.7°C | 24.9°C | 0.9°C | 29 mm | 75% | 1.8 m/s | 6 |
| 1983 | 14.7°C | 10.0°C | 5.3°C | 19.5°C | 1.1°C | 111 mm | 81% | 1.7 m/s | — |
| 1982 | 16.0°C | 10.3°C | 4.6°C | 23.1°C | -0.2°C | 111 mm | 80% | 1.9 m/s | — |
| 1981 | 20.3°C | 13.3°C | 6.3°C | 31.2°C | 1.4°C | 14 mm | 72% | 1.6 m/s | — |
Actual recorded April data for each year, 1981–2025 — sourced from NASA POWER.
The average high in April is around 18.7°C with lows near 6.3°C (mean 12.5°C), based on 45 years of NASA POWER data.
April averages 41 mm of rainfall in Santa Rosa, one of the drier months. The wettest on record was 147 mm in 2006.
The hottest April reached 31.2°C in 1981. The coldest dipped to -2.4°C in 1999.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average April temperatures have risen by about 1.6°C. Daytime highs moved from 17.8°C to 20.1°C and overnight lows from 5.7°C to 6.4°C over the same span.
April is one of the cooler months of the year in Santa Rosa and one of the drier months, so plan for around 18.7°C daytime highs and 6.3°C at night.
Not quite — April is the 6th coolest month in Santa Rosa, averaging 12.5°C.
For April in Santa Rosa, pack warm layers and a jacket for chilly mornings, with typical highs of 18.7°C and lows of 6.3°C.
Relative humidity in April averages 76% — quite humid.
Average wind speed in April is 1.7 m/s. The windiest April on record averaged 2.1 m/s (2022).
The wettest April on record was 2006 with 147 mm. On average, April sees 41 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 Santa Rosa 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.
