April weather forecast
San Francisco, CA

A beautiful dusk view of the Golden Gate Bridge in San Francisco, California
A beautiful dusk view of the Golden Gate Bridge in San Francisco, California

Weather in April

April is a comfortable spring month in San Francisco, California, with an average temperature ranging between max 63.1°F (17.3°C) and min 48.6°F (9.2°C).

Temperature

In San Francisco, the average high-temperature in April is practically the same as in March - an enjoyable 63.1°F (17.3°C). In San Francisco, California, in April, the average low-temperature is 48.6°F (9.2°C).

Humidity

The average relative humidity in April is 73%.

Rainfall

In San Francisco, in April, it is raining for 4.8 days, with typically 0.28" (7mm) of accumulated precipitation. Throughout the year, in San Francisco, California, there are 58.6 rainfall days, and 6.46" (164mm) of precipitation is accumulated.

Ocean temperature

April through June, with an average ocean temperature of 53.1°F (11.7°C), are months with the coldest seawater.
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 April, the average length of the day in San Francisco is 13h and 12min.
On the first day of the month, sunrise is at 6:54 am and sunset at 7:32 pm. On the last day of April, in San Francisco, sunrise is at 6:14 am and sunset at 7:58 pm PDT.

Sunshine

The average sunshine in April is 10.4h.

UV index

April, June through September, with an average maximum UV index of 5, are months with the highest UV index in San Francisco. A UV Index reading of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In April, the average maximum UV index of 5 translate into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in April in San Francisco?

The average high-temperature, in April, in San Francisco, is 63.1°F (17.3°C), while the average low-temperature is 48.6°F (9.2°C).

What is the average humidity in April in San Francisco?

In April, the average relative humidity in San Francisco is 73%.

How much does it rain in San Francisco in April?

In San Francisco, California, during April, the rain falls for 4.8 days and regularly aggregates up to 0.28" (7mm) of precipitation.

What months are the ocean coldest in San Francisco?

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

What is the water temperature in April in San Francisco?

In San Francisco, the average seawater temperature in April is 53.1°F (11.7°C). At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

How many hours of daylight does San Francisco have in April?

The average day length in April is 13h and 12min.

When is the sunrise / sunset in April in San Francisco?

In April, on the first day of the month, sunrise is at 6:54 am and sunset at 7:32 pm. On the last day of the month, in San Francisco, sunrise is at 6:14 am and sunset at 7:58 pm PDT.

How long on average sun shines in April in San Francisco?

In San Francisco, California, the average sunshine duration in April is 10.4h.

When is the highest UV index in San Francisco?

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

What is the UV index reading in April in San Francisco?

In San Francisco, California, the average daily maximum UV index in April is 5. A UV Index value of 3 to 5 symbolizes a medium health risk from exposure to the Sun's UV radiation.

Average temperature in April
San Francisco, CA

Average temperature in April - San Francisco, CA
  • Average high temperature in April: 63.1°F

The warmest month (with the highest average high temperature) is September (73.2°F).
The month with the lowest average high temperature is December (55.8°F).

  • Average low temperature in April: 48.6°F

The month with the highest average low temperature is September (56.7°F).
The coldest months (with the lowest average low temperature) are January and December (45.9°F).

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Average pressure in April
San Francisco, CA

Average pressure in April - San Francisco, 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).

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Average wind speed in April
San Francisco, CA

Average wind speed in April - San Francisco, CA
  • Average wind speed in April: 7.5mph

The windiest month (with the highest average wind speed) is May (7.6mph).
The calmest month (with the lowest average wind speed) is November (5.5mph).

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Average humidity in April
San Francisco, CA

Average humidity in April - San Francisco, CA
  • Average humidity in April: 73%

The month with the highest relative humidity is March (76%).
The month with the lowest relative humidity is October (67%).

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Average rainfall in April
San Francisco, CA

Average rainfall in April - San Francisco, CA
  • Average rainfall in April: 0.28"

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

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Average rainfall days in April
San Francisco, CA

Average rainfall days in April - San Francisco, CA
  • Average rainfall days in April: 4.8 days

The month with the highest number of rainy days is March (9.3 days).
The month with the least rainy days is June (1.9 days).

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Average sea temperature in April
San Francisco, CA

Average sea temperature in April - San Francisco, CA
  • Average sea temperature in April: 53°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 April /
Average sunshine in April
San Francisco, CA

Average daylight in April / Average sunshine in April - San Francisco, CA
  • Average daylight in April: 13h and 12min

The month with the longest days is June (Average daylight: 14h and 44min).
The month with the shortest days is December (Average daylight: 9h and 36min).

  • Average sunshine in April: 10h and 24min

The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).

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Average sunshine days in April
San Francisco, CA

Average sunshine days in April - San Francisco, CA
  • Average sunshine days in April: 24.4 days

The month with the most sunshine days is October (25.8 days).
The month with the least sunshine days is March (20.8 days).

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Average UV index in April
San Francisco, CA

Average UV index in April - San Francisco, CA
  • Average UV index in April: 5

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

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Average cloud cover in April
San Francisco, CA

Average cloud cover in April - San Francisco, CA
  • Average cloud cover in April: 27

The month with the most cloud cover is March (Cloud cover 36).
The months with the least cloud cover are July and September (Cloud cover 14).

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Average visibility in April
San Francisco, CA

Average visibility in April - San Francisco, 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).

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