August is one of the warmer months of the year in Roseville, with average highs near 35.3°C and lows around 17.3°C (mean 26.3°C). It is one of the drier months, averaging 2 mm of rainfall and 32% relative humidity across the period.
August is one of the warmer months of the year in Roseville. Across 45 years of records, the warmest August in Roseville was 2020 — when the month averaged 28.6°C — while the coldest was 2010 at 24.2°C. Typical August days reach 35.3°C with nights near 17.3°C. The long-term trend is warming, about 0.4°C per decade.
August is one of the drier months in Roseville, averaging 2 mm of rainfall. The wettest August on record was 2003 with 16 mm, while the driest were 2018, 2019 and 2021, among others at 0 mm.
Relative humidity in Roseville during August averages 32%. The most humid August was 1983 at 42%, and the least humid was 1994 at 26%.
August receives about 7.3 kWh/m²/day of solar energy in Roseville. The sunniest Augusts were 1995, 1998 and 2011 at 7.7 kWh/m²/day, and the cloudiest were 1984 and 2021 at 6.5.
Average wind speed in Roseville during August is 1.7 m/s. The windiest Augusts were 2013, 2016 and 2024, among others at 1.9 m/s, while the calmest were 1986, 1987 and 1998 at 1.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 25.8°C | 26.0°C | 26.2°C | 26.2°C | 27.8°C | +2°C |
| Avg High | 34.8°C | 34.9°C | 35.3°C | 35.2°C | 36.7°C | +1.9°C |
| Avg Low | 16.7°C | 17.0°C | 17.2°C | 17.1°C | 18.8°C | +2.1°C |
| Avg Rain | 3 mm | 3 mm | 2 mm | 1 mm | 3 mm | 0 mm |
August temperatures in Roseville have risen by about 1.9°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 10.6°C (1989) to a record high of 45.6°C (1990).
Rainfall in August is one of the drier months, averaging 2 mm, with a wettest year of 16 mm.
One of the best times to visit Roseville
August is one of the best times to visit Roseville. Expect days averaging 35.3°C and nights around 17.3°C (mean 26.3°C) — warmer than Roseville's yearly average — with low rainfall (2 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 | 37.2°C | 27.9°C | 18.6°C | 41.4°C | 13.9°C | 2 mm | 27% | 1.8 m/s | 7.4 |
| 2024 | 35.6°C | 26.9°C | 18.2°C | 42.1°C | 12.6°C | 7 mm | 31% | 1.9 m/s | 7.1 |
| 2023 | 36.2°C | 27.5°C | 18.8°C | 43.1°C | 13.9°C | 6 mm | 33% | 1.7 m/s | 7.1 |
| 2022 | 37.6°C | 28.4°C | 19.1°C | 43.1°C | 15.0°C | 1 mm | 27% | 1.8 m/s | 7.2 |
| 2021 | 36.1°C | 27.2°C | 18.2°C | 41.5°C | 12.6°C | 0 mm | 28% | 1.8 m/s | 6.5 |
| 2020 🔥 | 37.3°C | 28.6°C | 19.9°C | 42.8°C | 13.6°C | 2 mm | 30% | 1.6 m/s | 6.8 |
| 2019 | 36.0°C | 27.0°C | 18.1°C | 40.8°C | 14.5°C | 0 mm | 32% | 1.7 m/s | 7.4 |
| 2018 | 34.9°C | 25.8°C | 16.8°C | 40.0°C | 12.8°C | 0 mm | 30% | 1.7 m/s | 7.2 |
| 2017 | 36.7°C | 27.9°C | 19.0°C | 43.2°C | 13.7°C | 1 mm | 30% | 1.7 m/s | 7.1 |
| 2016 | 35.8°C | 26.4°C | 16.9°C | 40.0°C | 13.2°C | 0 mm | 27% | 1.9 m/s | 7.5 |
| 2015 | 34.9°C | 26.2°C | 17.4°C | 40.6°C | 13.8°C | 1 mm | 34% | 1.8 m/s | 7.2 |
| 2014 | 34.1°C | 25.8°C | 17.5°C | 42.2°C | 14.4°C | 3 mm | 37% | 1.8 m/s | 6.9 |
| 2013 | 34.6°C | 25.5°C | 16.5°C | 40.1°C | 13.1°C | 0 mm | 36% | 1.9 m/s | 7.4 |
| 2012 | 37.6°C | 27.9°C | 18.1°C | 43.3°C | 12.0°C | 1 mm | 27% | 1.9 m/s | 7.4 |
| 2011 | 34.6°C | 25.3°C | 15.9°C | 37.0°C | 12.5°C | 0 mm | 36% | 1.7 m/s | 7.7 |
| 2010 ❄️ | 33.3°C | 24.2°C | 15.2°C | 43.7°C | 11.2°C | 0 mm | 37% | 1.9 m/s | 7.6 |
| 2009 | 34.9°C | 26.1°C | 17.3°C | 40.4°C | 13.1°C | 0 mm | 33% | 1.7 m/s | 7.4 |
| 2008 | 36.4°C | 27.2°C | 18.0°C | 42.7°C | 13.1°C | 0 mm | 33% | 1.7 m/s | 7.5 |
| 2007 | 35.5°C | 26.3°C | 17.0°C | 40.3°C | 11.4°C | 2 mm | 34% | 1.8 m/s | 7.5 |
| 2006 | 34.1°C | 25.1°C | 16.1°C | 37.2°C | 13.1°C | 0 mm | 35% | 1.6 m/s | 7.6 |
| 2005 | 36.6°C | 27.4°C | 18.2°C | 41.4°C | 14.0°C | 0 mm | 30% | 1.6 m/s | 7.5 |
| 2004 | 35.4°C | 26.3°C | 17.3°C | 40.8°C | 12.8°C | 1 mm | 35% | 1.8 m/s | 7.4 |
| 2003 🌧️ | 34.5°C | 25.7°C | 16.9°C | 40.0°C | 13.4°C | 16 mm | 39% | 1.6 m/s | 7.3 |
| 2002 | 35.3°C | 25.9°C | 16.4°C | 41.9°C | 11.9°C | 0 mm | 30% | 1.7 m/s | 7.4 |
| 2001 | 35.6°C | 26.3°C | 17.1°C | 42.4°C | 12.4°C | 0 mm | 34% | 1.8 m/s | 7.6 |
| 2000 | 34.8°C | 26.0°C | 17.3°C | 41.9°C | 13.1°C | 2 mm | 32% | 1.7 m/s | 7.2 |
| 1999 | 33.2°C | 24.7°C | 16.2°C | 42.3°C | 12.9°C | 3 mm | 36% | 1.7 m/s | 7.2 |
| 1998 | 36.0°C | 26.9°C | 17.8°C | 44.0°C | 11.5°C | 1 mm | 34% | 1.4 m/s | 7.7 |
| 1997 | 34.6°C | 25.8°C | 16.9°C | 43.9°C | 13.8°C | 11 mm | 37% | 1.7 m/s | 7.2 |
| 1996 | 37.1°C | 27.9°C | 18.6°C | 43.3°C | 12.6°C | 3 mm | 27% | 1.5 m/s | 7.5 |
| 1995 | 34.2°C | 25.3°C | 16.3°C | 39.7°C | 11.7°C | 0 mm | 34% | 1.5 m/s | 7.7 |
| 1994 | 35.9°C | 26.2°C | 16.6°C | 40.8°C | 13.5°C | 0 mm | 26% | 1.6 m/s | 7.3 |
| 1993 | 33.4°C | 24.9°C | 16.3°C | 43.0°C | 11.8°C | 5 mm | 36% | 1.5 m/s | 7.3 |
| 1992 | 36.8°C | 27.5°C | 18.3°C | 42.0°C | 13.8°C | 1 mm | 28% | 1.6 m/s | 7.2 |
| 1991 | 33.1°C | 24.5°C | 15.9°C | 36.6°C | 11.0°C | 4 mm | 39% | 1.7 m/s | 7.3 |
| 1990 | 34.4°C | 25.9°C | 17.3°C | 45.6°C | 11.0°C | 3 mm | 35% | 1.6 m/s | 7.1 |
| 1989 | 33.2°C | 24.3°C | 15.3°C | 38.3°C | 10.6°C | 6 mm | 33% | 1.5 m/s | 7.2 |
| 1988 | 36.1°C | 26.9°C | 17.6°C | 41.2°C | 10.9°C | 0 mm | 30% | 1.6 m/s | 7.1 |
| 1987 | 35.5°C | 26.3°C | 17.0°C | 41.6°C | 12.0°C | 0 mm | 28% | 1.4 m/s | 7.2 |
| 1986 | 35.4°C | 26.0°C | 16.6°C | 38.0°C | 13.5°C | 0 mm | 27% | 1.4 m/s | 7.1 |
| 1985 | 33.9°C | 24.9°C | 15.8°C | 38.9°C | 12.1°C | 3 mm | 28% | 1.6 m/s | 6.9 |
| 1984 | 35.2°C | 26.2°C | 17.2°C | 40.9°C | 14.2°C | 9 mm | 30% | 1.7 m/s | 6.5 |
| 1983 | 33.4°C | 25.1°C | 16.8°C | 40.1°C | 13.2°C | 7 mm | 42% | 1.6 m/s | — |
| 1982 | 34.3°C | 25.6°C | 16.8°C | 41.0°C | 12.5°C | 1 mm | 33% | 1.5 m/s | — |
| 1981 | 36.5°C | 26.9°C | 17.3°C | 44.9°C | 12.9°C | 0 mm | 26% | 1.6 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 35.3°C with lows near 17.3°C (mean 26.3°C), based on 45 years of NASA POWER data.
August averages 2 mm of rainfall in Roseville, one of the drier months. The wettest on record was 16 mm in 2003.
The hottest August reached 45.6°C in 1990. The coldest dipped to 10.6°C in 1989.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 1.9°C. Daytime highs moved from 34.7°C to 36.5°C and overnight lows from 16.8°C to 18.6°C over the same span.
August is one of the warmer months of the year in Roseville and one of the drier months, so plan for around 35.3°C daytime highs and 17.3°C at night.
Not quite — August is the 11th coolest month in Roseville, averaging 26.3°C.
For August in Roseville, pack light, breathable clothing and sun protection, with typical highs of 35.3°C and lows of 17.3°C.
Relative humidity in August averages 32% — relatively dry.
Average wind speed in August is 1.7 m/s. The windiest August on record averaged 1.9 m/s (2010).
The wettest August on record was 2003 with 16 mm. On average, August sees 2 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 Roseville behaves each August, 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 August specifically, along with year-by-year records and how the month has changed over the decades.
