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August Weather in Santa Rosa, United States

Last updated: June 24, 2025

In August, the average temperature in Santa Rosa, United States is a pleasant 25°C (77°F). Expect a comfortable minimum of 14°C (58°F), with highs soaring up to a scorching 39°C (102°F). During this period, precipitation is typically around 56 mm (2.2 in) spread over 9 days, while the humidity hovers at a notable 78%, making the atmosphere feel quite warm and inviting.

August Temperature in Santa Rosa

In August in Santa Rosa, the average temperature is 25°C (77°F). Maximums can reach 39°C (102°F) and minimums can dip as low as 14°C (58°F). Pack light clothing and be prepared for both hot days and cooler evenings while traveling.

August Weather in Santa Rosa: Daily Temperature Highs, Lows, and Averages

The chart illustrates August temperature patterns in Santa Rosa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Santa Rosa, August typically has an average temperature of 25°C (77°F), with highs reaching up to 39°C (102°F) and lows dropping to around 14°C (58°F).
JanFebMarAprMayJunJulAugSepOctNovDec394251586877797772584941
Data source: Temperature data for Santa Rosa generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

August Precipitation in Santa Rosa

In Santa Rosa in August, the precipitation amount is 56 mm (2.2 in) over a period of 9 days.

August Precipitation Trends in Santa Rosa

The chart displays monthly precipitation patterns in Santa Rosa, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In Santa Rosa, August typically receives around 56 mm (2.2 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec151228273041315633481411
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Santa Rosa

In Santa Rosa in August, humidity is 78%. With an average temperature of 25°C (77°F), this humidity feels like walking through a warm, damp blanket, making travel feel a bit more exhausting and sticky as you navigate the sights.

August Average Humidity in Santa Rosa

This chart illustrates the average monthly humidity levels in Santa Rosa, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in Santa Rosa is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec74%75%61%62%69%74%75%78%76%76%80%77%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Santa Rosa

In Santa Rosa in August, the maximum UV index is 12, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, underscoring the importance of sun protection. For detailed information, you can check the Hourly UV Index in Santa Rosa.

Maximum UV Index Levels in Santa Rosa for August

The chart shows the monthly maximum UV Index (UVI) for Santa Rosa in August, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In August, the maximum UV index in Santa Rosa typically reaches 12, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec479111213121211854
Data source: Santa Rosa August UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How August Weather in Santa Rosa Compares to Other Months

Weather in Santa Rosa varies notably across the year, with each month offering distinct climate conditions. This page compares August’s weather to other months in Santa Rosa, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Santa Rosa, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (39°F)15 mm (0.6 inches)74%moderate
February Weather6°C (43°F)12 mm (0.5 inches)75%high
March Weather11°C (51°F)28 mm (1.1 inches)61%very high
April Weather14°C (58°F)27 mm (1.1 inches)61%extreme
May Weather20°C (68°F)30 mm (1.2 inches)69%extreme
June Weather25°C (78°F)41 mm (1.6 inches)74%extreme
July Weather26°C (80°F)31 mm (1.2 inches)75%extreme
August Weather25°C (77°F)56 mm (2.2 inches)78%extreme
September Weather22°C (72°F)33 mm (1.3 inches)76%extreme
October Weather14°C (58°F)47 mm (1.9 inches)76%very high
November Weather9°C (49°F)14 mm (0.6 inches)80%moderate
December Weather5°C (42°F)11 mm (0.4 inches)77%moderate

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