Monthly weather forecast and climate
Petaluma, CA

Weather in January

January is a mild winter month in Petaluma, California, with average temperature varying between 43.7°F (6.5°C) and 56.5°F (13.6°C). In Petaluma, the average high-temperature is essentially the same as in December - a mild 56.5°F (13.6°C). Weather in January »

Weather in February

February, the last month of the winter, in Petaluma, is another mild month, with temperature in the range of an average high of 58.6°F (14.8°C) and an average low of 43.7°F (6.5°C). In February, the average high-temperature is essentially the same as in January - a still mild 58.6°F (14.8°C). Weather in February »

Weather in March

March, the first month of the spring, in Petaluma, is also a moderate month, with average temperature ranging between min 44.6°F (7°C) and max 60.3°F (15.7°C). In Petaluma, the average high-temperature in March is practically the same as in February - a still moderate 60.3°F (15.7°C). Weather in March »

Weather in April

April in Petaluma, California, is a comfortable spring month, with average temperature fluctuating between 64.8°F (18.2°C) and 46.9°F (8.3°C). In Petaluma, the average high-temperature in April is almost the same as in March - an enjoyable 64.8°F (18.2°C). Weather in April »

Weather in May

The last month of the spring, May, is another comfortable month in Petaluma, California, with average temperature varying between 67.8°F (19.9°C) and 48.9°F (9.4°C). In May, the average high-temperature is practically the same as in April - a still enjoyable 67.8°F (19.9°C). Weather in May »

Weather in June

June, the first month of the summer, in Petaluma, is a warm month, with temperature in the range of an average low of 53.2°F (11.8°C) and an average high of 74.8°F (23.8°C). In June, the average high-temperature slightly increases, from a comfortable 67.8°F (19.9°C) in May, to a moderately hot 74.8°F (23.8°C). Weather in June »

Weather in July

July, like June, in Petaluma, California, is a moderately hot summer month, with average temperature varying between 54.3°F (12.4°C) and 77.5°F (25.3°C). In Petaluma, the average high-temperature is almost the same as in June - a still warm 77.5°F (25.3°C). Weather in July »

Weather in August

August, the last month of the summer, in Petaluma, is another warm month, with average temperature ranging between max 77.9°F (25.5°C) and min 55°F (12.8°C). The warmest month is August, with an average high-temperature of 77.9°F (25.5°C) and an average low-temperature of 55°F (12.8°C). Weather in August »

Weather in September

The first month of the autumn, September, is still a warm month in Petaluma, California, with average temperature fluctuating between 55.2°F (12.9°C) and 77.2°F (25.1°C). In September, the average high-temperature is essentially the same as in August - a still warm 77.2°F (25.1°C). Weather in September »

Weather in October

October, the same as September, in Petaluma, California, is another pleasant autumn month, with average temperature fluctuating between 52.7°F (11.5°C) and 71.2°F (21.8°C). In October, the average high-temperature marginally drops, from a moderately hot 77.2°F (25.1°C) in September, to a pleasant 71.2°F (21.8°C). Weather in October »

Weather in November

The last month of the autumn, November, is also an enjoyable month in Petaluma, California, with average temperature fluctuating between 47.3°F (8.5°C) and 62.4°F (16.9°C). In Petaluma, the average high-temperature in November slightly decreases, from a pleasant 71.2°F (21.8°C) in October, to a comfortable 62.4°F (16.9°C). Weather in November »

Weather in December

December, the first month of the winter, in Petaluma, is still a cool month, with average temperature varying between 55.2°F (12.9°C) and 43.2°F (6.2°C). The coldest month is December, with an average high-temperature of 55.2°F (12.9°C) and an average low-temperature of 43.2°F (6.2°C). Weather in December »
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FAQ

How much does it rain in Petaluma?

Throughout the year, in Petaluma, there are 71.1 rainfall days, and 15.24" (387mm) of precipitation is accumulated.

What are the months with the lowest UV index in Petaluma?

January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index in Petaluma.

What is the rainiest month in Petaluma?

February is the month with the most rainfall. Rain falls for 8.5 days and accumulates 3.5" (89mm) of precipitation.

What is the most humid month in Petaluma?

The most humid month in Petaluma is March, with an average relative humidity of 77%.

When are the longest days in Petaluma?

The month with the longest days is June, with an average of 14.8h of daylight.

When is the highest UV index in Petaluma?

June is the month with the highest UV index, with an average maximum UV index of 6.

What is the driest month in Petaluma?

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.

What month has the most sunshine in Petaluma?

The month with the most sunshine is July, with an average of 11.9h of sunshine.

What is the warmest month in Petaluma?

August is the warmest month, with an average high-temperature of 77.9°F (25.5°C) and an average low-temperature of 55°F (12.8°C).

What are the least humid months in Petaluma?

Months with the lowest humidity in Petaluma are September and October, with an average relative humidity of 65%.

What is the coldest month in Petaluma?

With an average high-temperature of 55.2°F (12.9°C) and an average low-temperature of 43.2°F (6.2°C), December is the coldest month in Petaluma, California.

What is the month with the shortest days in Petaluma?

December has the shortest days of the year in Petaluma, California, with an average of 9.5h of daylight.

What is the month with the least sunshine in Petaluma?

The month with the least sunshine in Petaluma, California, is December, with an average of 5.7h of sunshine.

Average temperature
Petaluma, CA

Average temperature - Petaluma, CA

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).

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).

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Average pressure
Petaluma, CA

Average pressure - Petaluma, CA

The month with the highest atmospheric pressure is January (30.13").
Months with the lowest atmospheric pressure are June, August and September (29.92").

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Average wind speed
Petaluma, CA

Average wind speed - Petaluma, CA

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).

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Average humidity
Petaluma, CA

Average humidity - Petaluma, CA

The month with the highest relative humidity is March (77%).
Months with the lowest relative humidity are September and October (65%).

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Average rainfall
Petaluma, CA

Average rainfall - Petaluma, CA

The wettest month (with the highest rainfall) is February (3.5").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days
Petaluma, CA

Average rainfall days - Petaluma, CA

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).

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Average daylight / Average sunshine
Petaluma, CA

Average daylight / Average sunshine - Petaluma, CA

The month with the longest days is June (Average daylight: 14.8h).
The month with the shortest days is December (Average daylight: 9.5h).

The month with the most sunshine is July (Average sunshine: 11.9h).
The month with the least sunshine is December (Average sunshine: 5.7h).

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Average sunshine days
Petaluma, CA

Average sunshine days - Petaluma, CA

The month with the most sunshine days is July (28.4 days).
The month with the least sunshine days is March (17.2 days).

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Average visibility
Petaluma, CA

Average visibility - Petaluma, CA

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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