August Weather in Fountain Valley, United States

Last updated: June 24, 2025

In Fountain Valley, United States, the average temperature in August hovers around 23°C (73°F). Expect a minimum of 15°C (60°F) and a maximum reaching up to 34°C (94°F). Additionally, the region sees a modest precipitation of just 2 mm (0.1 in) over 0 days, contributing to an average humidity of 69%. Enjoy the comfortable climate!

August Temperature in Fountain Valley

In August in Fountain Valley, the average temperature is 23°C (73°F). Maximums can reach 34°C (94°F), and minimums can be as low as 15°C (60°F). This pleasant weather makes it an ideal time for travelers to enjoy outdoor activities and sightseeing.

August Weather in Fountain Valley: Daily Temperature Highs, Lows, and Averages

The chart illustrates August temperature patterns in Fountain Valley, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Fountain Valley, August typically has an average temperature of 23°C (73°F), with highs reaching up to 34°C (94°F) and lows dropping to around 15°C (60°F).

Data source: Temperature data for Fountain Valley generated using information from the Copernicus Climate Change Service.

August Precipitation in Fountain Valley

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

August Precipitation Trends in Fountain Valley

The chart displays monthly precipitation patterns in Fountain Valley, 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 Fountain Valley, August typically receives around 2 mm (0.1 inches) of precipitation spread over approximately 0 days.

Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

August Humidity in Fountain Valley

In Fountain Valley in August humidity is 69%. With an average temperature of 23°C (73°F), this humidity feels like a warm embrace, making it perfect for leisurely strolls but potentially uncomfortable during the peak hours of the day, so travelers should stay hydrated and seek shade when exploring.

August Average Humidity in Fountain Valley

This chart illustrates the average monthly humidity levels in Fountain Valley, 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 Fountain Valley is approximately 69%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Fountain Valley

In Fountain Valley 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 Fountain Valley.

Maximum UV Index Levels in Fountain Valley for August

The chart shows the monthly maximum UV Index (UVI) for Fountain Valley 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 Fountain Valley typically reaches 10, which falls under the very high exposure category.

Data source: Fountain Valley 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 Fountain Valley Compares to Other Months

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

This table compares monthly weather conditions in Fountain Valley, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	14°C (57°F)	65 mm (2.5 inches)	74%	moderate
February Weather	14°C (58°F)	52 mm (2.0 inches)	79%	high
March Weather	15°C (60°F)	55 mm (2.2 inches)	75%	very high
April Weather	17°C (63°F)	23 mm (0.9 inches)	70%	very high
May Weather	18°C (64°F)	12 mm (0.5 inches)	70%	very high
June Weather	20°C (68°F)	4 mm (0.2 inches)	72%	extreme
July Weather	22°C (72°F)	3 mm (0.1 inches)	73%	extreme
August Weather	23°C (73°F)	2 mm (0.1 inches)	69%	very high
September Weather	22°C (72°F)	3 mm (0.1 inches)	68%	very high
October Weather	20°C (69°F)	9 mm (0.4 inches)	67%	high
November Weather	17°C (63°F)	18 mm (0.7 inches)	68%	moderate
December Weather	14°C (58°F)	68 mm (2.7 inches)	71%	moderate