May weather forecast
Petaluma, CA

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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).

Temperature

May's weather records an average high-temperature of a still comfortable 67.8°F (19.9°C), showing little deviation from April. During May, Petaluma records an average temperature of 48.9°F (9.4°C) at night.

Humidity

The average relative humidity in May is 72%.

Rainfall

In May, the rain falls for 5.3 days. Throughout May, 0.79" (20mm) of precipitation is accumulated. Throughout the year, there are 71.1 rainfall days, and 15.24" (387mm) of precipitation is accumulated.

Daylight

In Petaluma, the average length of the day in May is 14h and 16min.
On the first day of May, sunrise is at 6:12 am and sunset at 8:02 pm. On the last day of the month, sunrise is at 5:48 am and sunset at 8:27 pm PDT.

Sunshine

The average sunshine in May is 10.6h.

UV index

The average daily maximum UV index in May in Petaluma is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for average individuals.
Note: The UV index of 5 in May translates into these instructions:
Undertake protective steps - Obligation to safeguard skin and eyes from harm is in place. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear.
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Frequently asked questions

What are the temperatures in Petaluma in May?

In Petaluma, 67.8°F (19.9°C) is the average high-temperature and 48.9°F (9.4°C) is the average low-temperature during May.

What is the average humidity in May in Petaluma?

The average relative humidity in May in Petaluma, California, is 72%.

How much does it rain in Petaluma in May?

In Petaluma, California, in May, during 5.3 rainfall days, 0.79" (20mm) of precipitation is typically accumulated.

How many hours of daylight does Petaluma have in May?

In May, the average day length in Petaluma, California, is 14h and 16min.

When are sunrise and sunset in May in Petaluma?

In May, on the first day of the month, sunrise is at 6:12 am and sunset at 8:02 pm. On the last day of the month, sunrise is at 5:48 am and sunset at 8:27 pm PDT.

How long on average sun shines in May in Petaluma?

In May, the average sunshine duration is 10.6h.

What is the UV index intensity in May in Petaluma?

The average daily maximum UV index in May in Petaluma is 5. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Petaluma, CA

Average temperature in May - Petaluma, CA
  • Average high temperature in May: 67.8°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 May: 48.9°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).

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Average pressure in May
Petaluma, CA

Average pressure in May - Petaluma, CA
  • Average pressure in May: 29.98"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).

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Average wind speed in May
Petaluma, CA

Average wind speed in May - Petaluma, CA
  • Average wind speed in May: 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).

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Average humidity in May
Petaluma, CA

Average humidity in May - Petaluma, CA
  • Average humidity in May: 72%

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

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Average rainfall in May
Petaluma, CA

Average rainfall in May - Petaluma, CA
  • Average rainfall in May: 0.79"

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 in May
Petaluma, CA

Average rainfall days in May - Petaluma, CA
  • Average rainfall days in May: 5.3 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).

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Average daylight in May /
Average sunshine in May
Petaluma, CA

Average daylight in May / Average sunshine in May - Petaluma, CA
  • Average daylight in May: 14h and 2min

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 May: 10h and 4min

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).

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Average sunshine days in May
Petaluma, CA

Average sunshine days in May - Petaluma, CA
  • Average sunshine days in May: 25.1 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).

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Average UV index in May
Petaluma, CA

Average UV index in May - Petaluma, CA
  • Average UV index in May: 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).

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Average cloud cover in May
Petaluma, CA

Average cloud cover in May - Petaluma, CA
  • Average cloud cover in May: 26

The month with the most cloud cover is March (Cloud cover 39).
The month with the least cloud cover is July (Cloud cover 10).

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Average visibility in May
Petaluma, CA

Average visibility in May - Petaluma, CA
  • Average visibility in May: 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).

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Petaluma, California, USA

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