January weather forecast and climate
La Jolla, CA

Weather in January

January, like December, in La Jolla, California, is another comfortable winter month, with average temperature fluctuating between 51.4°F (10.8°C) and 64.9°F (18.3°C).

Temperature

In January, the average high-temperature is almost the same as in December - a still enjoyable 64.9°F (18.3°C). In January, the average low-temperature is 51.4°F (10.8°C).

Humidity

In La Jolla, the average relative humidity is 59%.

Rainfall

In La Jolla, California, during 5.2 rainfall days, 0.91" (23mm) of precipitation is typically accumulated. In La Jolla, during the entire year, the rain falls for 57.9 days and collects up to 7.48" (190mm) of precipitation.

Ocean temperature

In January, the average ocean temperature in La Jolla, California, is 59.4°F (15.2°C).
Note: Swimming in 59.4°F (15.2°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

Daylight

In January, the average length of the day in La Jolla, California, is 10.3h.

Sunshine

In La Jolla, the average sunshine in January is 6.9h.

UV index

Months with the lowest UV index in La Jolla, California, 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 medium vulnerability from the exposure to the Sun's UV radiation for the average person.
Note: The daily maximum UV index of 4 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 temperature in January in La Jolla?

In La Jolla, California, in January, the average high-temperature is 64.9°F (18.3°C), and the average low-temperature is 51.4°F (10.8°C).

What is the average humidity in January in La Jolla?

In La Jolla, the average relative humidity in January is 59%.

How many days does it rain in January in La Jolla?

In La Jolla, California, in January, during 5.2 rainfall days, 0.91" (23mm) of precipitation is typically accumulated.

What is the ocean temperature in January in La Jolla?

In January, the average ocean temperature in La Jolla, California, 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 La Jolla?

The average length of the day in January in La Jolla, California, is 10.3h.

How many hours of sunshine does La Jolla have in January?

The average sunshine in January in La Jolla, California, is 6.9h.

When is the lowest UV index in La Jolla?

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

What is the UV index intensity in January in La Jolla?

In January, the average daily maximum UV index in La Jolla, California, is 4. A UV Index of 3 to 5 symbolizes a medium health risk from the exposure to the Sun's UV radiation.

Average temperature in January
La Jolla, CA

Average temperature in January - La Jolla, CA
  • Average high temperature in January: 64.9°F

The warmest month (with the highest average high temperature) is August (79.3°F).
The month with the lowest average high temperature is December (63.5°F).

  • Average low temperature in January: 51.4°F

The month with the highest average low temperature is August (65.8°F).
The coldest month (with the lowest average low temperature) is February (50.2°F).

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Average pressure in January
La Jolla, CA

Average pressure in January - La Jolla, CA
  • Average pressure in January: 30.09"

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

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Average wind speed in January
La Jolla, CA

Average wind speed in January - La Jolla, CA
  • Average wind speed in January: 5.1mph

The windiest month (with the highest average wind speed) is April (6mph).
The calmest month (with the lowest average wind speed) is October (4.8mph).

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Average humidity in January
La Jolla, CA

Average humidity in January - La Jolla, CA
  • Average humidity in January: 59%

Months with the highest relative humidity are May and June (71%).
The month with the lowest relative humidity is November (57%).

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Average rainfall in January
La Jolla, CA

Average rainfall in January - La Jolla, CA
  • Average rainfall in January: 0.91"

The wettest month (with the highest rainfall) is February (1.46").
The driest month (with the least rainfall) is June (0.12").

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Average rainfall days in January
La Jolla, CA

Average rainfall days in January - La Jolla, CA
  • Average rainfall days in January: 5.2 days

The month with the highest number of rainy days is March (7.1 days).
The month with the least rainy days is June (2.2 days).

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Average sea temperature in January
La Jolla, CA

Average sea temperature in January - La Jolla, 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
La Jolla, CA

Average daylight in January / Average sunshine in January - La Jolla, CA
  • Average daylight in January: 10.3h

The month with the longest days is June (Average daylight: 14.3h).
The month with the shortest days is December (Average daylight: 10h).

  • Average sunshine in January: 6.9h

The month with the most sunshine is July (Average sunshine: 12h).
The month with the least sunshine is December (Average sunshine: 6.8h).

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Average sunshine days in January
La Jolla, CA

Average sunshine days in January - La Jolla, CA
  • Average sunshine days in January: 24.8 days

The month with the most sunshine days is January (24.8 days).
The month with the least sunshine days is February (20.2 days).

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Average UV index in January
La Jolla, CA

Average UV index in January - La Jolla, CA
  • Average UV index in January: 4

Months with the highest UV index are July, August and September (UV index 6).
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
La Jolla, CA

Average cloud cover in January - La Jolla, CA
  • Average cloud cover in January: 20

Months with the most cloud cover are March and December (Cloud cover 23).
The month with the least cloud cover is August (Cloud cover 8).

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Average visibility in January
La Jolla, CA

Average visibility in January - La Jolla, CA
  • Average visibility in January: 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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