July Weather in Petaluma, United States

Last updated: June 24, 2025

In Petaluma, United States, the average temperature in July is a comfortable 18°C (65°F). Temperatures can range from a cool 11°C (52°F) to a warm 32°C (90°F). Expect minimal rainfall, with only 1 mm (0.0 in) of precipitation over 0 days. The average humidity remains at a pleasant 70%, making it an ideal time to enjoy the local climate!

July Temperature in Petaluma

In July in Petaluma, the average temperature is 18°C (65°F). The maximum can reach 32°C (90°F) and the minimum can be as low as 11°C (52°F). This makes Petaluma an ideal destination for travelers seeking mild weather with warm days and cool evenings.

July Weather in Petaluma: Daily Temperature Highs, Lows, and Averages

The chart illustrates July temperature patterns in Petaluma, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Petaluma, July typically has an average temperature of 18°C (65°F), with highs reaching up to 32°C (90°F) and lows dropping to around 11°C (52°F).

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

July Precipitation in Petaluma

In Petaluma in July, the precipitation amount is 1 mm (0.0 in) during a span of 0 days.

July Precipitation Trends in Petaluma

The chart displays monthly precipitation patterns in Petaluma, with values for each month alongside July’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how July’s conditions compare to those of other months. In Petaluma, July typically receives around 1 mm (0.0 inches) of precipitation spread over approximately 0 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

July Humidity in Petaluma

In Petaluma in July humidity is 70%. With an average temperature of 18°C (65°F), this humidity feels like a warm embrace, making it quite comfortable for traveling, though it can leave you feeling slightly sticky if you're on the move for too long.

July Average Humidity in Petaluma

This chart illustrates the average monthly humidity levels in Petaluma, with July’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In July, average humidity in Petaluma is approximately 70%, offering insight into how humid the weather typically is during this month.

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

July UV Index in Petaluma

In Petaluma in July, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Petaluma.

Maximum UV Index Levels in Petaluma for July

The chart shows the monthly maximum UV Index (UVI) for Petaluma in July, 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 July, the maximum UV index in Petaluma typically reaches 11, which falls under the extreme exposure category.

Data source: Petaluma July 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 July Weather in Petaluma Compares to Other Months

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

This table compares monthly weather conditions in Petaluma, showing how July’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	10°C (50°F)	131 mm (5.2 inches)	86%	moderate
February Weather	10°C (51°F)	147 mm (5.8 inches)	84%	moderate
March Weather	11°C (52°F)	93 mm (3.7 inches)	83%	high
April Weather	13°C (56°F)	45 mm (1.8 inches)	80%	very high
May Weather	15°C (60°F)	27 mm (1.0 inches)	80%	very high
June Weather	18°C (65°F)	2 mm (0.1 inches)	76%	extreme
July Weather	18°C (65°F)	1 mm (0.0 inches)	70%	extreme
August Weather	18°C (65°F)	1 mm (0.0 inches)	66%	very high
September Weather	18°C (65°F)	2 mm (0.1 inches)	68%	very high
October Weather	16°C (61°F)	38 mm (1.5 inches)	72%	high
November Weather	12°C (54°F)	59 mm (2.3 inches)	84%	moderate
December Weather	9°C (49°F)	103 mm (4.1 inches)	84%	moderate