January weather forecast and climate
La Mesa, CA

Weather in January

January, like December, in La Mesa, California, is another comfortable winter month, with average temperature ranging between min 49.6°F (9.8°C) and max 66.2°F (19°C).

Temperature

In January, the average high-temperature is relatively the same as in December - a still enjoyable 66.2°F (19°C). The average low-temperature, in La Mesa, is 49.6°F (9.8°C).

Humidity

The average relative humidity is 56%.

Rainfall

In January, in La Mesa, the rain falls for 5.3 days. Throughout January, 0.71" (18mm) of precipitation is accumulated. Throughout the year, there are 54.5 rainfall days, and 6.57" (167mm) of precipitation is accumulated.

Daylight

The average length of the day in La Mesa is 10.3h.

Sunshine

In La Mesa, the average sunshine is 6.8h.

UV index

Months with the lowest UV index are January, February, November and December, with an average maximum UV index of 4. A UV Index of 3 to 5 symbolizes a medium health hazard from the exposure to the Sun's UV rays for the average person.
Note: The daily maximum UV index of 4 in January interpret into the following advice:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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 January in La Mesa?

The average high-temperature, in January, in La Mesa, California, is 66.2°F (19°C), while the average low-temperature is 49.6°F (9.8°C).

What is the average humidity in January in La Mesa?

The average relative humidity in January is 56%.

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

In La Mesa, in January, it is raining for 5.3 days, with typically 0.71" (18mm) of accumulated precipitation.

How many hours of daylight does La Mesa have in January?

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

How long on average sun shines in January in La Mesa?

In La Mesa, California, the average sunshine in January is 6.8h.

What is the month with the lowest UV index in La Mesa?

Months with the lowest UV index are January, February, November and December, with an average maximum UV index of 4.

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

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

Average temperature in January
La Mesa, CA

Average temperature in January - La Mesa, CA
  • Average high temperature in January: 66.2°F

The warmest month (with the highest average high temperature) is August (82.6°F).
The month with the lowest average high temperature is December (64.2°F).

  • Average low temperature in January: 49.6°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 (48.7°F).

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Average pressure in January
La Mesa, CA

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

The month with the highest atmospheric pressure is January (30.09").
The month with the lowest atmospheric pressure is June (29.87").

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Average wind speed in January
La Mesa, CA

Average wind speed in January - La Mesa, CA
  • Average wind speed in January: 5mph

The windiest month (with the highest average wind speed) is April (5.7mph).
The calmest month (with the lowest average wind speed) is October (4.5mph).

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Average humidity in January
La Mesa, CA

Average humidity in January - La Mesa, CA
  • Average humidity in January: 56%

The month with the highest relative humidity is May (68%).
The month with the lowest relative humidity is November (55%).

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Average rainfall in January
La Mesa, CA

Average rainfall in January - La Mesa, CA
  • Average rainfall in January: 0.71"

The wettest month (with the highest rainfall) is February (1.3").
The driest month (with the least rainfall) is June (0.08").

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Average rainfall days in January
La Mesa, CA

Average rainfall days in January - La Mesa, CA
  • Average rainfall days in January: 5.3 days

The month with the highest number of rainy days is March (7.8 days).
The month with the least rainy days is June (1.4 days).

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Average daylight in January /
Average sunshine in January
La Mesa, CA

Average daylight in January / Average sunshine in January - La Mesa, 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: 6.8h

The month with the most sunshine is July (Average sunshine: 12h).
The month with the least sunshine is December (Average sunshine: 6.7h).

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Average sunshine days in January
La Mesa, CA

Average sunshine days in January - La Mesa, CA
  • Average sunshine days in January: 24.7 days

The month with the most sunshine days is June (28.1 days).
The month with the least sunshine days is February (21 days).

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Average UV index in January
La Mesa, CA

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

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

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Average cloud cover in January
La Mesa, CA

Average cloud cover in January - La Mesa, CA
  • Average cloud cover in January: 21

The month with the most cloud cover is March (Cloud cover 24).
The month with the least cloud cover is August (Cloud cover 8).

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Average visibility in January
La Mesa, CA

Average visibility in January - La Mesa, 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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