Climate and monthly weather forecastPetaluma, CA
Climate and monthly weather forecast
Weather in January
January in Petaluma, California, is a mild winter month, with an average temperature varying between 56.5°F (13.6°C) and 43.7°F (6.5°C). As January takes hold, the average high-temperature is a mild 56.5°F (13.6°C), nearly mirroring that of the previous month. Weather in January »Weather in February
February, the last month of the winter in Petaluma, is another mild month, with an average temperature ranging between min 43.7°F (6.5°C) and max 58.6°F (14.8°C). Welcoming February, Petaluma notes an average high-temperature of a still refreshing 58.6°F (14.8°C), nearly consistent with January's 56.5°F (13.6°C). Weather in February »Weather in March
The first month of the spring, March, is still a refreshing month in Petaluma, California, with an average temperature varying between 60.3°F (15.7°C) and 44.6°F (7°C). March commences with an average high-temperature of a still mild 60.3°F (15.7°C), showing little deviation from February's 58.6°F (14.8°C). Weather in March »Weather in April
April in Petaluma, California, is a comfortable spring month, with an average temperature varying between 64.8°F (18.2°C) and 46.9°F (8.3°C). The onset of April brings an average high-temperature of a still refreshing 64.8°F (18.2°C), nearly matching the March temperature. Weather in April »Weather in May
May, the last month of the spring in Petaluma, is another refreshing month, with an average temperature varying between 67.8°F (19.9°C) and 48.9°F (9.4°C). May's weather records an average high-temperature of a still comfortable 67.8°F (19.9°C), showing little deviation from April. 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). June's arrival brings a modest temperature shift, moving from an enjoyable 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, 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). July is marked by an average high-temperature of a still warm 77.5°F (25.3°C), almost identical to the preceding month. Weather in July »Weather in August
The last month of the summer, August, is another warm month in Petaluma, California, with an average temperature varying between 55°F (12.8°C) and 77.9°F (25.5°C). Petaluma experiences its highest temperatures in August, with an average peak of 77.9°F (25.5°C) and a low of 55°F (12.8°C). Weather in August »Weather in September
September, the first month of the autumn in Petaluma, is also a moderately hot month, with temperature in the range of an average high of 77.2°F (25.1°C) and an average low of 55.2°F (12.9°C). The shift into September uncovers an average high-temperature of a still warm 77.2°F (25.1°C), subtly different from the previous month. Weather in September »Weather in October
October, like September, is another pleasant autumn month in Petaluma, California, with an average temperature varying between 71.2°F (21.8°C) and 52.7°F (11.5°C). In Petaluma, the average high-temperature in October slightly decreases 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
November, the last month of the autumn in Petaluma, is another comfortable month, with an average temperature ranging between min 47.3°F (8.5°C) and max 62.4°F (16.9°C). The start of November involves a subtle temperature drop, shifting from an agreeable 71.2°F (21.8°C) in October to an enjoyable 62.4°F (16.9°C). Weather in November »Weather in December
December, the first month of the winter in Petaluma, is also a fresh month, with an average temperature ranging between max 55.2°F (12.9°C) and min 43.2°F (6.2°C). The month of December sees the lowest average temperatures, reaching 55.2°F (12.9°C) at the peak and 43.2°F (6.2°C) at the low. Weather in December »Updated: Feb 9, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Throughout the year, there are 71.1 rainfall days, and 15.24" (387mm) of precipitation is accumulated.
The months with the lowest UV index in Petaluma, California, are January, February, November and December, with an average maximum UV index of 3.
The month with the most rainfall in Petaluma, California, is February, when the rain falls for 8.5 days and typically aggregates up to 3.5" (89mm) of precipitation.
March is the most humid month in Petaluma, with an average relative humidity of 77%.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from PST to PDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from PDT to PST.
The month with the longest days is June, with an average of 14h and 48min of daylight.
June is the month with the highest UV index in Petaluma, with an average maximum UV index of 6.
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.
With an average of 11.9h of sunshine, July has the most sunshine of the year.
August, recording an average high temperature of 77.9°F (25.5°C) and a low temperature of 55°F (12.8°C), is Petaluma's warmest month.
September and October, with an average relative humidity of 65%, are the least humid months in Petaluma.
Petaluma's coldest month, December, generally records average temperatures ranging from a high of 55.2°F (12.9°C) to a low of 43.2°F (6.2°C).
The month with the shortest days is December, with an average of 9h and 36min of daylight.
The month with the least sunshine is December, with an average of 5.7h of sunshine.
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).
Average pressure
Petaluma, CA
- Average pressure in January:
30.13"Hg - Average pressure in February:
30.08"Hg - Average pressure in March:
30.07"Hg - Average pressure in April:
30.03"Hg - Average pressure in May:
29.98"Hg - Average pressure in June:
29.92"Hg
- Average pressure in July:
29.93"Hg - Average pressure in August:
29.92"Hg - Average pressure in September:
29.92"Hg - Average pressure in October:
29.98"Hg - Average pressure in November:
30.07"Hg - Average pressure in December:
30.11"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
Petaluma, CA
- Average wind speed in January:
5.3mph - Average wind speed in February:
6mph - Average wind speed in March:
6.5mph - Average wind speed in April:
7mph - Average wind speed in May:
7mph - Average wind speed in June:
6.6mph
- Average wind speed in July:
5.7mph - Average wind speed in August:
5.3mph - Average wind speed in September:
5.3mph - Average wind speed in October:
5.1mph - Average wind speed in November:
5mph - Average wind speed in December:
5.4mph
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
Petaluma, CA
The month with the highest relative humidity is March (77%).
The months with the lowest relative humidity are September and October (65%).
Average rainfall
Petaluma, CA
- Average rainfall in January:
2.64" - Average rainfall in February:
3.5" - Average rainfall in March:
2.4" - Average rainfall in April:
0.75" - Average rainfall in May:
0.79" - Average rainfall in June:
0.16"
- Average rainfall in July:
0.04" - Average rainfall in August:
0.04" - Average rainfall in September:
0.08" - Average rainfall in October:
0.75" - Average rainfall in November:
1.42" - Average rainfall in December:
2.68"
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
Petaluma, CA
- Average rainfall days in January:
9.5 days - Average rainfall days in February:
8.5 days - Average rainfall days in March:
12.6 days - Average rainfall days in April:
7.3 days - Average rainfall days in May:
5.3 days - Average rainfall days in June:
1.8 days
- Average rainfall days in July:
1 days - Average rainfall days in August:
1.1 days - Average rainfall days in September:
2.2 days - Average rainfall days in October:
4.4 days - Average rainfall days in November:
7.3 days - Average rainfall days in December:
10.1 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 / Average sunshine
Petaluma, CA
- Average daylight in January:
9h and 54min - Average daylight in February:
10h and 48min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 12min - Average daylight in May:
14h and 18min - Average daylight in June:
14h and 48min
- Average daylight in July:
14h and 30min - Average daylight in August:
13h and 36min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 12min - Average daylight in November:
10h and 6min - Average daylight in December:
9h and 36min
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 January:
5h and 48min - Average sunshine in February:
6h and 6min - Average sunshine in March:
7h and 30min - Average sunshine in April:
10h and 12min - Average sunshine in May:
10h and 36min - Average sunshine in June:
11h and 30min
- Average sunshine in July:
11h and 54min - Average sunshine in August:
11h and 48min - Average sunshine in September:
11h and 0min - Average sunshine in October:
7h and 0min - Average sunshine in November:
6h and 30min - Average sunshine in December:
5h and 42min
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
Petaluma, CA
- Average sunshine days in January:
20.3 days - Average sunshine days in February:
18.8 days - Average sunshine days in March:
17.2 days - Average sunshine days in April:
21.6 days - Average sunshine days in May:
25.1 days - Average sunshine days in June:
26.8 days
- Average sunshine days in July:
28.4 days - Average sunshine days in August:
27.3 days - Average sunshine days in September:
26.6 days - Average sunshine days in October:
25.4 days - Average sunshine days in November:
22.1 days - Average sunshine days in December:
20.2 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
Petaluma, CA
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
Petaluma, CA
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
Petaluma, CA
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).
