January weather forecast
San Diego, CA

Coronado Island in San Diego, California, USA,
Coronado Island in San Diego, California, USA,

Weather in January

January, the same as December, is another enjoyable winter month in San Diego, California, with an average temperature ranging between min 52.7°F (11.5°C) and max 64.2°F (17.9°C).

Temperature

In January, the average high-temperature is essentially the same as in December - a still comfortable 64.2°F (17.9°C). In January, the average low-temperature is 52.7°F (11.5°C).

Humidity

In San Diego, California, the average relative humidity in January is 60%.

Rainfall

In San Diego, during January, the rain falls for 5.3 days and regularly aggregates up to 1.06" (27mm) of precipitation. Throughout the year, there are 61.8 rainfall days, and 8.7" (221mm) of precipitation is accumulated.

Ocean temperature

In San Diego, the average water temperature is 59.4°F (15.2°C).
Note: For most, swimming in 59.4°F (15.2°C) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 69.8°F (21°C) to 59°F (15°C).

Daylight

In January, the average length of the day is 10h and 17min.
On the first day of the month, sunrise is at 6:50 am and sunset at 4:53 pm. On the last day of January, in San Diego, California, sunrise is at 6:43 am and sunset at 5:20 pm PST.

Sunshine

In San Diego, the average sunshine in January is 6.8h.

UV index

The months with the lowest UV index in San Diego are January through March, November and December, with an average maximum UV index of 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for ordinary individuals.
Note: The daily maximum UV index of 4 in January interpret into the following advice:
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. 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 January in San Diego?

The average relative humidity in January in San Diego, California, is 60%.

How much does it rain in San Diego in January?

In San Diego, in January, it is raining for 5.3 days, with typically 1.06" (27mm) of accumulated precipitation.

What is the ocean temperature in January in San Diego?

In San Diego, California, in January, the average water temperature is 59.4°F (15.2°C). For most, swimming in 59.4°F (15.2°C) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 69.8°F (21°C) to 59°F (15°C).

What is the average length of the day in January in San Diego?

In San Diego, the average day length in January is 10h and 17min.

When are sunrise and sunset in January in San Diego?

On the first day of January in San Diego, California, sunrise is at 6:50 am and sunset at 4:53 pm. On the last day of the month, sunrise is at 6:43 am and sunset at 5:20 pm PST.

How many hours of sunshine does San Diego have in January?

The average sunshine duration in January in San Diego is 6.8h.

What is the month with the lowest UV index in San Diego?

January through March, November and December, with an average maximum UV index of 4, are months with the lowest UV index in San Diego, California.

What is the UV index reading in January in San Diego?

The average daily maximum UV index in January in San Diego, California, is 4. A UV Index reading of 3 to 5 represents a moderate health threat from unprotected exposure to UV radiation.

Average temperature in January
San Diego, CA

Average temperature in January - San Diego, CA
  • Average high temperature in January: 64.2°F

The warmest month (with the highest average high temperature) is August (77.4°F).
The month with the lowest average high temperature is February (63.1°F).

  • Average low temperature in January: 52.7°F

The month with the highest average low temperature is August (65.7°F).
The coldest month (with the lowest average low temperature) is February (51.8°F).

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Average pressure in January
San Diego, CA

Average pressure in January - San Diego, CA
  • Average pressure in January: 30.09"

The month with the highest atmospheric pressure is January (30.09").
The months with the lowest atmospheric pressure are June and September (29.88").

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Average wind speed in January
San Diego, CA

Average wind speed in January - San Diego, CA
  • Average wind speed in January: 5.3mph

The windiest months (with the highest average wind speed) are April and May (6.3mph).
The calmest month (with the lowest average wind speed) is October (5.2mph).

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Average humidity in January
San Diego, CA

Average humidity in January - San Diego, CA
  • Average humidity in January: 60%

The month with the highest relative humidity is June (73%).
The month with the lowest relative humidity is November (59%).

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Average rainfall in January
San Diego, CA

Average rainfall in January - San Diego, CA
  • Average rainfall in January: 1.06"

The wettest month (with the highest rainfall) is December (1.65").
The driest month (with the least rainfall) is June (0.12").

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Average rainfall days in January
San Diego, CA

Average rainfall days in January - San Diego, CA
  • Average rainfall days in January: 5.3 days

The month with the highest number of rainy days is March (7.6 days).
The month with the least rainy days is June (2.7 days).

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Average sea temperature in January
San Diego, CA

Average sea temperature in January - San Diego, CA
  • Average sea temperature in January: 59.2°F

The best month for swimming (with the highest average sea temperature) is August (67.9°F).
The coldest month (with the lowest average sea temperature) is February (58.7°F).

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Average daylight in January /
Average sunshine in January
San Diego, CA

Average daylight in January / Average sunshine in January - San Diego, CA
  • Average daylight in January: 10h and 17min

The month with the longest days is June (Average daylight: 14h and 16min).
The month with the shortest days is December (Average daylight: 10h and 2min).

  • Average sunshine in January: 6.8h

The months with the most sunshine are July and August (Average sunshine: 11.9h).
The month with the least sunshine is December (Average sunshine: 6.7h).

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Average sunshine days in January
San Diego, CA

Average sunshine days in January - San Diego, CA
  • Average sunshine days in January: 24.3 days

The month with the most sunshine days is January (24.3 days).
The month with the least sunshine days is July (20.3 days).

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Average UV index in January
San Diego, CA

Average UV index in January - San Diego, CA
  • Average UV index in January: 4

The months with the highest UV index are July, August and September (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 4).

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Average cloud cover in January
San Diego, CA

Average cloud cover in January - San Diego, CA
  • Average cloud cover in January: 21

The month with the most cloud cover is December (Cloud cover 24).
The month with the least cloud cover is August (Cloud cover 9).

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Average visibility in January
San Diego, CA

Average visibility in January - San Diego, CA
  • Average visibility in January: 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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