nomadseason

August Weather in San Dimas, United States

Last updated: June 24, 2025

In August, the average temperature in San Dimas, United States hovers around 25°C (77°F). Temperatures can range from a cool 15°C (60°F) to a scorching 39°C (102°F). With only 2 mm (0.1 in) of precipitation over 0 days and an average humidity of 69%, it’s a great time to enjoy the warm, dry weather!

August Temperature in San Dimas

In August in San Dimas, the average temperature is 25°C (77°F). Maximum temperatures can reach 39°C (102°F), while minimums can drop to as low as 15°C (60°F). This variability makes San Dimas an ideal destination for travelers who enjoy warm weather but also appreciate cooler evenings.

August Weather in San Dimas: Daily Temperature Highs, Lows, and Averages

The chart illustrates August temperature patterns in San Dimas, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Dimas, 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 15°C (60°F).
JanFebMarAprMayJunJulAugSepOctNovDec545456626470767674686154
Data source: Temperature data for San Dimas generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

August Precipitation in San Dimas

In San Dimas in August, the precipitation amount is 2 mm (0.1 in) during a span of 0 days.

August Precipitation Trends in San Dimas

The chart displays monthly precipitation patterns in San Dimas, 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 San Dimas, August typically receives around 2 mm (0.1 inches) of precipitation spread over approximately 0 days.
JanFebMarAprMayJunJulAugSepOctNovDec80707627171123122679
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

August Humidity in San Dimas

In San Dimas in August humidity is 69%. With an average temperature of 25°C (77°F), this humidity feels like a warm, heavy blanket enveloping you, making every step feel slightly sluggish and encouraging frequent breaks to enjoy refreshing beverages and cool breezes.

August Average Humidity in San Dimas

This chart illustrates the average monthly humidity levels in San Dimas, 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 San Dimas is approximately 69%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec74%79%75%71%70%72%73%69%68%67%68%71%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in San Dimas

In San Dimas in August, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in San Dimas.

Maximum UV Index Levels in San Dimas for August

The chart shows the monthly maximum UV Index (UVI) for San Dimas 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 San Dimas typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101012111010754
Data source: San Dimas 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 San Dimas Compares to Other Months

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

This table compares monthly weather conditions in San Dimas, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather12°C (54°F)80 mm (3.1 inches)74%moderate
February Weather12°C (55°F)70 mm (2.8 inches)79%high
March Weather14°C (57°F)76 mm (3.0 inches)75%very high
April Weather16°C (62°F)27 mm (1.1 inches)70%very high
May Weather18°C (64°F)17 mm (0.7 inches)70%very high
June Weather21°C (70°F)1 mm (0.0 inches)72%extreme
July Weather24°C (76°F)1 mm (0.1 inches)73%extreme
August Weather25°C (77°F)2 mm (0.1 inches)69%very high
September Weather23°C (74°F)3 mm (0.1 inches)68%very high
October Weather20°C (68°F)12 mm (0.5 inches)67%high
November Weather16°C (61°F)26 mm (1.0 inches)68%moderate
December Weather12°C (54°F)79 mm (3.1 inches)71%moderate

Compare San Dimas's Climate with Cities Worldwide