July weather forecastPetaluma, CA
July
Weather in July
July, the same as June, is a moderately hot summer month in Petaluma, California, with an average temperature fluctuating between 77.5°F (25.3°C) and 54.3°F (12.4°C).Temperature
July is marked by an average high-temperature of a still warm 77.5°F (25.3°C), almost identical to the preceding month. Petaluma records a marked divergence from the day's high temperatures, with nights in July averaging at a fresh 54.3°F (12.4°C).Humidity
The average relative humidity in July is 68%.Rainfall
July and August are months with the least rain when the rain falls for 1 days and typically aggregates up to 0.04" (1mm) of rain.Daylight
In July, the average length of the day in Petaluma is 14h and 31min.On the first day of July in Petaluma, sunrise is at 5:51 am and sunset at 8:37 pm. On the last day of the month, sunrise is at 6:12 am and sunset at 8:20 pm PDT.
Sunshine
The month with the most sunshine is July, with an average of 11.9h of sunshine.UV index
In July, the average daily maximum UV index in Petaluma, California, is 5. A UV Index reading of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for the average person.Note: A maximum daily UV index of 5 during July morphs into the following directions:
Preventative actions are necessary - The mandate to avoid skin and eye damage is in place. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in July
Petaluma, CA
- Average high temperature in July: 77.5°F
The warmest month (with the highest average high temperature) is August (77.9°F).
The month with the lowest average high temperature is December (55.2°F).
- Average low temperature in July: 54.3°F
The month with the highest average low temperature is September (55.2°F).
The coldest month (with the lowest average low temperature) is December (43.2°F).
Average pressure in July
Petaluma, CA
- Average pressure in July: 29.93"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.92"Hg).
Average wind speed in July
Petaluma, CA
- Average wind speed in July: 5.7mph
The windiest months (with the highest average wind speed) are April and May (7mph).
The calmest month (with the lowest average wind speed) is November (5mph).
Average humidity in July
Petaluma, CA
- Average humidity in July: 68%
The month with the highest relative humidity is March (77%).
The months with the lowest relative humidity are September and October (65%).
Average rainfall in July
Petaluma, CA
- Average rainfall in July: 0.04"
The wettest month (with the highest rainfall) is February (3.5").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in July
Petaluma, CA
- Average rainfall days in July: 1 days
The month with the highest number of rainy days is March (12.6 days).
The month with the least rainy days is July (1 days).
Average daylight in July /
Average sunshine in July
Petaluma, CA
- Average daylight in July: 14h and 30min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in July: 11h and 54min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).
Average sunshine days in July
Petaluma, CA
- Average sunshine days in July: 28.4 days
The month with the most sunshine days is July (28.4 days).
The month with the least sunshine days is March (17.2 days).
Average UV index in July
Petaluma, CA
- Average UV index in July: 5
The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in July
Petaluma, CA
- Average cloud cover in July: 10
The month with the most cloud cover is March (Cloud cover 39).
The month with the least cloud cover is July (Cloud cover 10).
Average visibility in July
Petaluma, CA
- Average visibility in July: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
