June is one of the warmer months of the year in Santa Rosa, with average highs near 28.8°C and lows around 11.8°C (mean 20.3°C). It is one of the drier months, averaging 6 mm of rainfall and 56% relative humidity across the period.
June is one of the warmer months of the year in Santa Rosa. Across 45 years of records, the warmest June in Santa Rosa was 1981 — when the month averaged 23.5°C — while the coldest was 1998 at 16.7°C. Typical June days reach 28.8°C with nights near 11.8°C. The long-term trend is warming, about 0.2°C per decade.
June is one of the drier months in Santa Rosa, averaging 6 mm of rainfall. The wettest June on record was 2011 with 50 mm, while the driest were 2003, 2008 and 2025, among others at 0 mm.
Relative humidity in Santa Rosa during June averages 56%. The most humid June was 1998 at 78%, and the least humid was 1981 at 39%.
June receives about 8 kWh/m²/day of solar energy in Santa Rosa. The sunniest Junes were 2002 and 2018 at 8.6 kWh/m²/day, and the cloudiest were 1988 and 1998 at 7.
Average wind speed in Santa Rosa during June is 1.9 m/s. The windiest Junes were 1981, 2012 and 2021 at 2.2 m/s, while the calmest were 1996 and 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 | 20.6°C | 19.4°C | 20.2°C | 20.4°C | 21.3°C | +0.7°C |
| Avg High | 29.3°C | 27.7°C | 28.7°C | 28.8°C | 30.0°C | +0.7°C |
| Avg Low | 11.9°C | 11.2°C | 11.7°C | 11.9°C | 12.6°C | +0.7°C |
| Avg Rain | 4 mm | 10 mm | 5 mm | 8 mm | 2 mm | -2 mm |
June temperatures in Santa Rosa have risen by about 0.5°C between 1981–1985 and 2021–2025.
June has ranged from a record low of 4.5°C (1999) to a record high of 41.5°C (2021).
Rainfall in June is one of the drier months, averaging 6 mm, with a wettest year of 50 mm.
One of the best times to visit Santa Rosa
June is one of the best times to visit Santa Rosa. Expect days averaging 28.8°C and nights around 11.8°C (mean 20.3°C) — warmer than Santa Rosa's yearly average — with low rainfall (6 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 | 30.1°C | 21.0°C | 12.0°C | 36.3°C | 9.4°C | 0 mm | 50% | 1.9 m/s | 8.4 |
| 2024 | 31.8°C | 22.4°C | 13.0°C | 37.3°C | 9.7°C | 0 mm | 47% | 1.8 m/s | 8.4 |
| 2023 | 25.5°C | 18.1°C | 10.7°C | 36.9°C | 7.0°C | 0 mm | 66% | 1.8 m/s | 7.5 |
| 2022 | 30.4°C | 21.9°C | 13.4°C | 38.6°C | 8.2°C | 8 mm | 46% | 2.1 m/s | 8.1 |
| 2021 | 31.3°C | 22.1°C | 13.0°C | 41.5°C | 7.5°C | 0 mm | 46% | 2.2 m/s | 8.5 |
| 2020 | 31.1°C | 22.3°C | 13.5°C | 38.0°C | 7.7°C | 1 mm | 46% | 2 m/s | 8.4 |
| 2019 | 28.4°C | 20.2°C | 12.1°C | 35.3°C | 6.6°C | 0 mm | 60% | 1.8 m/s | 8.4 |
| 2018 | 30.4°C | 21.3°C | 12.1°C | 38.7°C | 7.1°C | 0 mm | 51% | 1.9 m/s | 8.6 |
| 2017 | 28.4°C | 20.4°C | 12.3°C | 38.7°C | 6.5°C | 7 mm | 62% | 1.8 m/s | 8.1 |
| 2016 | 29.9°C | 21.0°C | 12.1°C | 38.5°C | 8.6°C | 2 mm | 50% | 1.9 m/s | 8 |
| 2015 | 30.7°C | 21.7°C | 12.7°C | 37.7°C | 9.5°C | 2 mm | 52% | 1.8 m/s | 8.1 |
| 2014 | 31.5°C | 22.0°C | 12.4°C | 40.4°C | 7.7°C | 1 mm | 46% | 2 m/s | 8.5 |
| 2013 | 30.1°C | 21.3°C | 12.5°C | 40.9°C | 8.6°C | 17 mm | 53% | 2.1 m/s | 7.8 |
| 2012 | 28.1°C | 19.5°C | 11.0°C | 39.5°C | 6.1°C | 2 mm | 54% | 2.2 m/s | 8.3 |
| 2011 🌧️ | 24.3°C | 17.4°C | 10.6°C | 34.2°C | 6.1°C | 50 mm | 72% | 1.6 m/s | 7.2 |
| 2010 | 26.4°C | 18.9°C | 11.4°C | 36.1°C | 7.8°C | 1 mm | 66% | 1.8 m/s | 8.1 |
| 2009 | 27.3°C | 19.4°C | 11.6°C | 39.6°C | 8.8°C | 3 mm | 60% | 1.8 m/s | 7.7 |
| 2008 | 30.7°C | 21.3°C | 11.8°C | 38.8°C | 7.9°C | 0 mm | 44% | 1.9 m/s | 8.4 |
| 2007 | 29.4°C | 20.4°C | 11.4°C | 37.1°C | 5.9°C | 1 mm | 51% | 2 m/s | 8.4 |
| 2006 | 27.0°C | 19.7°C | 12.4°C | 36.0°C | 8.6°C | 0 mm | 71% | 1.6 m/s | 7.8 |
| 2005 | 23.9°C | 17.0°C | 10.1°C | 34.2°C | 5.4°C | 31 mm | 72% | 1.8 m/s | 7.7 |
| 2004 | 29.6°C | 20.5°C | 11.4°C | 36.9°C | 8.5°C | 0 mm | 56% | 2 m/s | 8.4 |
| 2003 | 28.3°C | 20.0°C | 11.6°C | 37.9°C | 7.9°C | 0 mm | 63% | 1.7 m/s | 8.1 |
| 2002 | 29.9°C | 20.8°C | 11.7°C | 35.7°C | 8.3°C | 0 mm | 54% | 2 m/s | 8.6 |
| 2001 | 30.8°C | 21.7°C | 12.6°C | 38.5°C | 8.2°C | 7 mm | 44% | 2 m/s | 8.2 |
| 2000 | 30.1°C | 21.1°C | 12.0°C | 40.3°C | 7.1°C | 8 mm | 56% | 1.8 m/s | 8 |
| 1999 | 28.7°C | 19.6°C | 10.5°C | 39.2°C | 4.5°C | 3 mm | 56% | 1.8 m/s | 8.2 |
| 1998 ❄️ | 23.0°C | 16.7°C | 10.5°C | 29.4°C | 7.7°C | 3 mm | 78% | 1.5 m/s | 7 |
| 1997 | 29.6°C | 20.9°C | 12.3°C | 36.0°C | 9.1°C | 11 mm | 54% | 1.9 m/s | 8.1 |
| 1996 | 28.7°C | 20.2°C | 11.6°C | 37.0°C | 8.9°C | 1 mm | 59% | 1.5 m/s | 8.5 |
| 1995 | 24.1°C | 17.3°C | 10.6°C | 35.0°C | 5.4°C | 20 mm | 71% | 1.7 m/s | 7.6 |
| 1994 | 30.2°C | 20.7°C | 11.2°C | 38.0°C | 6.6°C | 1 mm | 47% | 1.8 m/s | 8.2 |
| 1993 | 27.0°C | 19.2°C | 11.3°C | 35.3°C | 6.6°C | 23 mm | 62% | 1.8 m/s | 7.8 |
| 1992 | 28.2°C | 20.1°C | 12.1°C | 36.2°C | 6.9°C | 21 mm | 60% | 1.8 m/s | 7.1 |
| 1991 | 28.2°C | 19.5°C | 10.9°C | 35.1°C | 7.4°C | 12 mm | 55% | 1.7 m/s | 7.5 |
| 1990 | 28.8°C | 19.7°C | 10.7°C | 36.8°C | 5.4°C | 0 mm | 58% | 1.9 m/s | 8.3 |
| 1989 | 29.3°C | 20.6°C | 11.9°C | 37.5°C | 8.8°C | 7 mm | 54% | 2 m/s | 7.4 |
| 1988 | 29.1°C | 20.6°C | 12.1°C | 38.7°C | 5.2°C | 11 mm | 53% | 1.8 m/s | 7 |
| 1987 | 31.1°C | 21.7°C | 12.3°C | 37.6°C | 7.5°C | 1 mm | 43% | 1.9 m/s | 8 |
| 1986 | 28.3°C | 19.9°C | 11.5°C | 35.3°C | 8.3°C | 0 mm | 55% | 1.8 m/s | 7.6 |
| 1985 | 32.1°C | 23.0°C | 13.8°C | 39.1°C | 6.8°C | 1 mm | 42% | 1.9 m/s | 7.9 |
| 1984 | 29.8°C | 20.7°C | 11.6°C | 35.9°C | 6.4°C | 6 mm | 49% | 1.9 m/s | 7.7 |
| 1983 | 25.8°C | 18.1°C | 10.3°C | 29.8°C | 6.8°C | 2 mm | 68% | 1.7 m/s | — |
| 1982 | 25.0°C | 17.5°C | 10.0°C | 31.3°C | 4.8°C | 5 mm | 66% | 1.7 m/s | — |
| 1981 🔥 | 32.9°C | 23.5°C | 14.0°C | 39.6°C | 7.0°C | 0 mm | 39% | 2.2 m/s | — |
Actual recorded June data for each year, 1981–2025 — sourced from NASA POWER.
The average high in June is around 28.8°C with lows near 11.8°C (mean 20.3°C), based on 45 years of NASA POWER data.
June averages 6 mm of rainfall in Santa Rosa, one of the drier months. The wettest on record was 50 mm in 2011.
The hottest June reached 41.5°C in 2021. The coldest dipped to 4.5°C in 1999.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average June temperatures have risen by about 0.5°C. Daytime highs moved from 29.1°C to 29.8°C and overnight lows from 11.9°C to 12.4°C over the same span.
June is one of the warmer months of the year in Santa Rosa and one of the drier months, so plan for around 28.8°C daytime highs and 11.8°C at night.
Not quite — June is the 9th coolest month in Santa Rosa, averaging 20.3°C.
For June in Santa Rosa, pack light layers you can adjust through the day, with typical highs of 28.8°C and lows of 11.8°C.
Relative humidity in June averages 56% — moderately humid.
Average wind speed in June is 1.9 m/s. The windiest June on record averaged 2.2 m/s (1981).
The wettest June on record was 2011 with 50 mm. On average, June sees 6 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 June, 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 June specifically, along with year-by-year records and how the month has changed over the decades.
