April weather forecastPetaluma, CA
April
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).Temperature
The onset of April brings an average high-temperature of a still refreshing 64.8°F (18.2°C), nearly matching the March temperature. An average low-temperature of 46.9°F (8.3°C) is anticipated throughout the nights in Petaluma, California, during April.Humidity
In Petaluma, the average relative humidity in April is 73%.Rainfall
In Petaluma, in April, during 7.3 rainfall days, 0.75" (19mm) of precipitation is typically accumulated. Throughout the year, in Petaluma, California, there are 71.1 rainfall days, and 15.24" (387mm) of precipitation is accumulated.Daylight
The average length of the day in April is 13h and 13min.On the first day of the month, sunrise is at 6:54 am and sunset at 7:34 pm. On the last day of April, sunrise is at 6:13 am and sunset at 8:01 pm PDT.
Sunshine
In April, the average sunshine is 10.2h.UV index
The average daily maximum UV index in April is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for average individuals.Note: In April, the average maximum UV index of 5 translates into the following recommendations:
Take necessary precautions - Protection from skin and eye injury is mandatory. Minimize direct exposure to the Sun during midday when its radiation is at its peak. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in April
Petaluma, CA
- Average high temperature in April: 64.8°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 April: 46.9°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 April
Petaluma, CA
- Average pressure in April: 30.03"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 April
Petaluma, CA
- Average wind speed in April: 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 April
Petaluma, CA
- Average humidity in April: 73%
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 April
Petaluma, CA
- Average rainfall in April: 0.75"
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 April
Petaluma, CA
- Average rainfall days in April: 7.3 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 April /
Average sunshine in April
Petaluma, CA
- Average daylight in April: 13h and 12min
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 April: 10h and 12min
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 April
Petaluma, CA
- Average sunshine days in April: 21.6 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 April
Petaluma, CA
- Average UV index in April: 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 April
Petaluma, CA
- Average cloud cover in April: 29
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 April
Petaluma, CA
- Average visibility in April: 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).
