May weather forecast and climate
Richmond, CA

Richmond and Golden Gate residential districts as split by the scenic natural park
Richmond and Golden Gate residential districts as split by the scenic natural park

Weather in May

May, the last month of the spring, in Richmond, is another comfortable month, with average temperature fluctuating between 67.6°F (19.8°C) and 50.4°F (10.2°C).

Temperature

In Richmond, California, the average high-temperature is almost the same as in April - a still comfortable 67.6°F (19.8°C). In Richmond, in May, the average low-temperature is 50.4°F (10.2°C).

Humidity

In May, the average relative humidity in Richmond is 71%.

Rainfall

In Richmond, California,, during 4.6 rainfall days, 0.31" (8mm) of precipitation is typically accumulated. In Richmond, during the entire year, the rain falls for 64.5 days and collects up to 5.98" (152mm) of precipitation.

Ocean temperature

April through June, with an average ocean temperature of 53.1°F (11.7°C), are months with the coldest seawater in Richmond.
Note: Swimming in 53.1°F (11.7°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

Daylight

In Richmond, the average length of the day in May is 14.2h.

Sunshine

In May, the average sunshine in Richmond is 10.5h.

UV index

April through September, with an average maximum UV index of 5, are months with the highest UV index in Richmond. A UV Index value of 3 to 5 symbolizes a medium vulnerability from the exposure to the Sun's UV radiation for the ordinary person.
Note: In May, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against the skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the average humidity in May in Richmond?

In May, the average relative humidity in Richmond is 71%.

How many days does it rain in May in Richmond?

In Richmond, in May, during 4.6 rainfall days, 0.31" (8mm) of precipitation is typically accumulated.

What months are the ocean coldest in Richmond?

April through June, with an average ocean temperature of 53.1°F (11.7°C), are months with the coldest seawater.

How cold is the water in May in Richmond?

In Richmond, in May, the average water temperature is 53.1°F (11.7°C). Swimming in 53.1°F (11.7°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

What is the average length of the day in May in Richmond?

The average length of the day in May in Richmond is 14.2h.

How long on average sun shines in May in Richmond?

In May, the average sunshine is 10.5h.

What are the months with the highest UV index in Richmond?

April through September, with an average maximum UV index of 5, are months with the highest UV index in Richmond.

How high is the UV index in May in Richmond?

In May, the average daily maximum UV index in Richmond, California, is 5. A UV Index reading of 3 to 5 represents a medium health risk from unsafe exposure to the Sun's UV rays.

Average temperature in May
Richmond, CA

Average temperature in May - Richmond, CA
  • Average high temperature in May: 67.6°F

The warmest month (with the highest average high temperature) is September (75.7°F).
The month with the lowest average high temperature is December (55.6°F).

  • Average low temperature in May: 50.4°F

The month with the highest average low temperature is September (56.5°F).
The coldest month (with the lowest average low temperature) is January (44.8°F).

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Average pressure in May
Richmond, CA

Average pressure in May - Richmond, CA
  • Average pressure in May: 29.98"

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 in May
Richmond, CA

Average wind speed in May - Richmond, CA
  • Average wind speed in May: 7.5mph

The windiest month (with the highest average wind speed) is May (7.5mph).
The calmest month (with the lowest average wind speed) is November (5.1mph).

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Average humidity in May
Richmond, CA

Average humidity in May - Richmond, CA
  • Average humidity in May: 71%

The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is October (65%).

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Average rainfall in May
Richmond, CA

Average rainfall in May - Richmond, CA
  • Average rainfall in May: 0.31"

The wettest month (with the highest rainfall) is February (1.38").
The driest months (with the least rainfall) are June, July, August and September (0.08").

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Average rainfall days in May
Richmond, CA

Average rainfall days in May - Richmond, CA
  • Average rainfall days in May: 4.6 days

The month with the highest number of rainy days is March (10.8 days).
The month with the least rainy days is June (2 days).

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Average sea temperature in May
Richmond, CA

Average sea temperature in May - Richmond, CA
  • Average sea temperature in May: 53.1°F

The best month for swimming (with the highest average sea temperature) is September (57.3°F).
The coldest months (with the lowest average sea temperature) are April and June (53°F).

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

Average daylight in May / Average sunshine in May - Richmond, CA
  • Average daylight in May: 14.2h

The month with the longest days is June (Average daylight: 14.8h).
The month with the shortest days is December (Average daylight: 9.6h).

  • Average sunshine in May: 10.5h

The month with the most sunshine is July (Average sunshine: 11.8h).
The month with the least sunshine is December (Average sunshine: 5.7h).

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Average sunshine days in May
Richmond, CA

Average sunshine days in May - Richmond, CA
  • Average sunshine days in May: 22.5 days

The month with the most sunshine days is July (24.9 days).
The month with the least sunshine days is March (18.4 days).

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Average UV index in May
Richmond, CA

Average UV index in May - Richmond, CA
  • Average UV index in May: 5

Months with the highest UV index are April, May, June, July, August and September (UV index 5).
Months with the lowest UV index are January, February, November and December (UV index 3).

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Average cloud cover in May
Richmond, CA

Average cloud cover in May - Richmond, CA
  • Average cloud cover in May: 27

The month with the most cloud cover is March (Cloud cover 37).
The month with the least cloud cover is July (Cloud cover 14).

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Average visibility in May
Richmond, CA

Average visibility in May - Richmond, CA
  • Average visibility in May: 6mi

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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