July is one of the warmer months of the year in Santa Rosa, with average highs near 32.5°C and lows around 13.8°C (mean 23.2°C). It is one of the drier months, averaging 1 mm of rainfall and 47% relative humidity across the period.
July is one of the warmer months of the year in Santa Rosa. Across 45 years of records, the warmest July in Santa Rosa was 1988 — when the month averaged 26.5°C — while the coldest was 2011 at 21°C. Typical July days reach 32.5°C with nights near 13.8°C. The long-term July temperature trend is broadly flat.
July is one of the drier months in Santa Rosa, averaging 1 mm of rainfall. The wettest July on record was 2005 with 10 mm, while the driest were 2023, 2024 and 2025, among others at 0 mm.
Relative humidity in Santa Rosa during July averages 47%. The most humid July was 1998 at 61%, and the least humid was 1981 at 35%.
July receives about 7.9 kWh/m²/day of solar energy in Santa Rosa. The sunniest Julys were 2016 and 2017 at 8.4 kWh/m²/day, and the cloudiest was 1988 at 7.2.
Average wind speed in Santa Rosa during July is 1.8 m/s. The windiest Julys were 2015 and 2025 at 2.2 m/s, while the calmest was 1998 at 1.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 23.5°C | 23.0°C | 23.3°C | 22.6°C | 23.6°C | +0.1°C |
| Avg High | 33.2°C | 32.2°C | 32.7°C | 31.6°C | 33.0°C | -0.2°C |
| Avg Low | 13.8°C | 13.7°C | 13.9°C | 13.5°C | 14.2°C | +0.4°C |
| Avg Rain | 0 mm | 0 mm | 2 mm | 0 mm | 0 mm | 0 mm |
July temperatures in Santa Rosa have stayed relatively stable across the record.
July has ranged from a record low of 7.8°C (1982) to a record high of 43.9°C (1988).
Rainfall in July is one of the drier months, averaging 1 mm, with a wettest year of 10 mm.
One of the best times to visit Santa Rosa
July is one of the best times to visit Santa Rosa. Expect days averaging 32.5°C and nights around 13.8°C (mean 23.2°C) — warmer than Santa Rosa's yearly average — with low rainfall (1 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 | 30.3°C | 21.5°C | 12.7°C | 37.8°C | 9.7°C | 0 mm | 51% | 2.2 m/s | 7.9 |
| 2024 | 35.8°C | 26.4°C | 17.0°C | 43.5°C | 10.9°C | 0 mm | 36% | 1.9 m/s | 8 |
| 2023 | 33.5°C | 24.0°C | 14.5°C | 40.2°C | 9.4°C | 0 mm | 45% | 1.8 m/s | 8.3 |
| 2022 | 31.8°C | 22.5°C | 13.3°C | 37.2°C | 10.3°C | 1 mm | 48% | 2.1 m/s | 7.9 |
| 2021 | 33.6°C | 23.9°C | 14.2°C | 40.1°C | 10.1°C | 0 mm | 42% | 2 m/s | 8 |
| 2020 | 32.7°C | 23.0°C | 13.3°C | 38.6°C | 10.0°C | 0 mm | 44% | 2 m/s | 8.3 |
| 2019 | 31.6°C | 22.4°C | 13.1°C | 38.8°C | 9.5°C | 0 mm | 51% | 1.8 m/s | 8.2 |
| 2018 | 33.9°C | 24.6°C | 15.4°C | 40.4°C | 9.8°C | 0 mm | 41% | 2 m/s | 7.8 |
| 2017 | 33.2°C | 23.4°C | 13.5°C | 39.5°C | 10.5°C | 0 mm | 43% | 1.8 m/s | 8.4 |
| 2016 | 31.7°C | 22.6°C | 13.6°C | 40.1°C | 10.4°C | 0 mm | 44% | 2 m/s | 8.4 |
| 2015 | 30.9°C | 22.6°C | 14.4°C | 38.8°C | 10.4°C | 2 mm | 53% | 2.2 m/s | 7.4 |
| 2014 | 32.0°C | 23.2°C | 14.4°C | 39.8°C | 10.9°C | 0 mm | 48% | 2.1 m/s | 7.5 |
| 2013 | 31.8°C | 22.6°C | 13.4°C | 41.3°C | 9.8°C | 0 mm | 48% | 1.9 m/s | 7.8 |
| 2012 | 31.2°C | 21.9°C | 12.6°C | 38.7°C | 9.7°C | 1 mm | 49% | 1.8 m/s | 8.1 |
| 2011 ❄️ | 29.5°C | 21.0°C | 12.4°C | 35.3°C | 9.4°C | 0 mm | 59% | 1.7 m/s | 8.2 |
| 2010 | 30.6°C | 21.4°C | 12.2°C | 36.6°C | 9.1°C | 0 mm | 56% | 1.9 m/s | 8 |
| 2009 | 33.1°C | 23.3°C | 13.5°C | 40.4°C | 9.6°C | 0 mm | 45% | 1.9 m/s | 8.2 |
| 2008 | 33.5°C | 23.7°C | 14.0°C | 43.0°C | 9.5°C | 0 mm | 45% | 1.8 m/s | 7.9 |
| 2007 | 32.3°C | 22.9°C | 13.5°C | 40.5°C | 9.9°C | 3 mm | 53% | 1.9 m/s | 8.1 |
| 2006 | 33.3°C | 24.3°C | 15.3°C | 42.1°C | 9.7°C | 0 mm | 51% | 1.6 m/s | 8.2 |
| 2005 🌧️ | 33.2°C | 24.1°C | 14.9°C | 38.9°C | 10.6°C | 10 mm | 54% | 1.7 m/s | 8.2 |
| 2004 | 31.9°C | 22.6°C | 13.3°C | 36.1°C | 10.6°C | 2 mm | 53% | 1.9 m/s | 7.9 |
| 2003 | 33.9°C | 24.3°C | 14.7°C | 39.6°C | 9.6°C | 1 mm | 46% | 1.8 m/s | 8 |
| 2002 | 32.6°C | 23.1°C | 13.5°C | 43.0°C | 9.7°C | 0 mm | 49% | 1.9 m/s | 8 |
| 2001 | 31.8°C | 22.5°C | 13.2°C | 41.3°C | 9.7°C | 3 mm | 48% | 1.8 m/s | 7.9 |
| 2000 | 31.2°C | 22.0°C | 12.7°C | 40.7°C | 9.6°C | 1 mm | 49% | 1.8 m/s | 7.9 |
| 1999 | 30.9°C | 21.4°C | 12.0°C | 41.4°C | 9.0°C | 0 mm | 46% | 1.9 m/s | 7.9 |
| 1998 | 30.4°C | 21.8°C | 13.2°C | 39.1°C | 9.4°C | 0 mm | 61% | 1.5 m/s | 8 |
| 1997 | 33.3°C | 23.7°C | 14.1°C | 39.1°C | 10.9°C | 1 mm | 44% | 1.8 m/s | 8.1 |
| 1996 | 33.7°C | 24.4°C | 15.1°C | 38.7°C | 9.9°C | 0 mm | 44% | 1.7 m/s | 8.1 |
| 1995 | 30.3°C | 21.8°C | 13.4°C | 38.0°C | 10.3°C | 1 mm | 58% | 1.7 m/s | 7.9 |
| 1994 | 33.5°C | 23.6°C | 13.7°C | 38.0°C | 10.7°C | 0 mm | 41% | 1.6 m/s | 7.6 |
| 1993 | 32.1°C | 22.7°C | 13.4°C | 39.9°C | 10.5°C | 2 mm | 47% | 1.7 m/s | 8 |
| 1992 | 31.6°C | 22.7°C | 13.7°C | 36.9°C | 10.3°C | 0 mm | 51% | 1.8 m/s | 7.7 |
| 1991 | 33.3°C | 23.7°C | 14.1°C | 39.7°C | 10.7°C | 0 mm | 48% | 1.7 m/s | 7.6 |
| 1990 | 33.4°C | 24.0°C | 14.7°C | 40.2°C | 10.6°C | 0 mm | 46% | 1.7 m/s | 7.7 |
| 1989 | 33.6°C | 23.3°C | 13.0°C | 38.6°C | 7.9°C | 0 mm | 41% | 2 m/s | 8.1 |
| 1988 🔥 | 36.6°C | 26.5°C | 16.4°C | 43.9°C | 9.8°C | 0 mm | 35% | 1.9 m/s | 7.2 |
| 1987 | 31.1°C | 21.6°C | 12.0°C | 39.6°C | 8.0°C | 0 mm | 48% | 2.1 m/s | 7.8 |
| 1986 | 32.0°C | 22.6°C | 13.2°C | 38.7°C | 9.2°C | 0 mm | 43% | 1.7 m/s | 7.8 |
| 1985 | 34.1°C | 24.8°C | 15.4°C | 39.4°C | 11.0°C | 1 mm | 37% | 1.9 m/s | 7.4 |
| 1984 | 35.0°C | 25.2°C | 15.5°C | 40.3°C | 8.6°C | 0 mm | 35% | 1.7 m/s | 7.4 |
| 1983 | 29.9°C | 21.1°C | 12.3°C | 36.8°C | 8.0°C | 1 mm | 55% | 1.9 m/s | — |
| 1982 | 31.7°C | 22.4°C | 13.1°C | 38.6°C | 7.8°C | 0 mm | 47% | 1.7 m/s | — |
| 1981 | 34.4°C | 24.1°C | 13.7°C | 38.3°C | 9.8°C | 0 mm | 35% | 1.8 m/s | — |
Actual recorded July data for each year, 1981–2025 — sourced from NASA POWER.
The average high in July is around 32.5°C with lows near 13.8°C (mean 23.2°C), based on 45 years of NASA POWER data.
July averages 1 mm of rainfall in Santa Rosa, one of the drier months. The wettest on record was 10 mm in 2005.
The hottest July reached 43.9°C in 1988. The coldest dipped to 7.8°C in 1982.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average July temperatures have risen by about 0.2°C. Daytime highs moved from 33°C to 33°C and overnight lows from 14°C to 14.3°C over the same span.
July is one of the warmer months of the year in Santa Rosa and one of the drier months, so plan for around 32.5°C daytime highs and 13.8°C at night.
Not quite — July is the 11th coolest month in Santa Rosa, averaging 23.2°C.
For July in Santa Rosa, pack light, breathable clothing and sun protection, with typical highs of 32.5°C and lows of 13.8°C.
Relative humidity in July averages 47% — relatively dry.
Average wind speed in July is 1.8 m/s. The windiest July on record averaged 2.2 m/s (2015).
The wettest July on record was 2005 with 10 mm. On average, July sees 1 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 July, 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 July specifically, along with year-by-year records and how the month has changed over the decades.
