January weather forecast
Pasadena, CA

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Pasadena City Hall in California, with neon-lit paths and natural gardens, under a perfect blue night sky
Pasadena City Hall in California, with neon-lit paths and natural gardens, under a perfect blue night sky

Weather in January

January in Pasadena, California kicks off with cool temperatures, the lower end falling to 47.3°F (8.5°C) and the higher spectrum reaching 63.9°F (17.7°C) on average. Due to its position in the winter period, January leans towards the cooler side, offering relatively comfortable weather compared to the biting cold experienced in other parts of the nation. Visitors this month enjoy moderate weather, allowing outdoor activities without the worry of sweltering heat or freezing chills. January exhibits moderate rainfall, resulting in fresh and vibrant surroundings. The wind speed remains relatively low, producing an overall calm atmosphere.

Temperature

At the onset of January, Pasadena records an average high-temperature of a still comfortable 63.9°F (17.7°C), showing little deviation from the preceding month. In the month of January, Pasadena witnesses a consistent average low-temperature of 47.3°F (8.5°C).

Humidity

The average relative humidity in January is 51%.

Rainfall

In Pasadena, in January, it is raining for 5.7 days, with typically 1.57" (40mm) of accumulated precipitation. Throughout the year, in Pasadena, California, there are 50.1 rainfall days, and 8.5" (216mm) of precipitation is accumulated.

Daylight

In January, the average length of the day is 10h and 11min.
On the first day of the month, sunrise is at 6:58 am and sunset at 4:53 pm. On the last day of January, sunrise is at 6:50 am and sunset at 5:21 pm PST.

Sunshine

January, February and December, with an average of 6.9h of sunshine, are months with the least sunshine.

UV index

The average daily maximum UV index in January in Pasadena, California, is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for ordinary individuals.
Note: In January, the UV index of 4 transforms into the following advice:
Ensure safety - Sun damage prevention is strongly urged. Avoiding the Sun during its peak radiation time around midday is a healthy practice. Tightly woven clothing, when worn loosely, shields effectively against the Sun.
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Frequently asked questions

What are January temperatures in Pasadena?

The high-temperature in Pasadena during January is 63.9°F (17.7°C) and the low-temperature is 47.3°F (8.5°C).

What is the average humidity in January in Pasadena?

The average relative humidity in January is 51%.

How much does it rain in Pasadena in January?

In Pasadena, California, during January, the rain falls for 5.7 days and regularly aggregates up to 1.57" (40mm) of precipitation.

How many hours of daylight does Pasadena have in January?

In Pasadena, California, the average day length in January is 10h and 11min.

When are sunrise and sunset in January in Pasadena?

On the first day of January in Pasadena, sunrise is at 6:58 am and sunset at 4:53 pm. On the last day of the month, sunrise is at 6:50 am and sunset at 5:21 pm PST.

What is the month with the least sunshine in Pasadena?

The months with the least sunshine in Pasadena are January, February and December, with an average of 6.9h of sunshine.

How long on average sun shines in January in Pasadena?

In January, the average sunshine duration is 6.9h.

What is the UV index reading in January in Pasadena?

In Pasadena, the average daily maximum UV index in January is 4. A UV Index estimate of 3 to 5 represents a moderate vulnerability from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in January
Pasadena, CA

Average temperature in January - Pasadena, CA
  • Average high temperature in January: 63.9°F

The warmest month (with the highest average high temperature) is August (87.1°F).
The month with the lowest average high temperature is December (61.7°F).

  • Average low temperature in January: 47.3°F

The month with the highest average low temperature is August (64.9°F).
The coldest month (with the lowest average low temperature) is February (46.6°F).

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Average pressure in January
Pasadena, CA

Average pressure in January - Pasadena, CA
  • Average pressure in January: 30.11"Hg

The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).

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Average wind speed in January
Pasadena, CA

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

The windiest month (with the highest average wind speed) is April (5.8mph).
The calmest month (with the lowest average wind speed) is September (4.4mph).

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Average humidity in January
Pasadena, CA

Average humidity in January - Pasadena, CA
  • Average humidity in January: 51%

The month with the highest relative humidity is June (58%).
The month with the lowest relative humidity is November (47%).

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Average rainfall in January
Pasadena, CA

Average rainfall in January - Pasadena, CA
  • Average rainfall in January: 1.57"

The wettest month (with the highest rainfall) is February (1.77").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in January
Pasadena, CA

Average rainfall days in January - Pasadena, CA
  • Average rainfall days in January: 5.7 days

The month with the highest number of rainy days is March (7.8 days).
The month with the least rainy days is June (1.1 days).

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Average daylight in January /
Average sunshine in January
Pasadena, CA

Average daylight in January / Average sunshine in January - Pasadena, CA
  • Average daylight in January: 10h and 1min

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).

  • Average sunshine in January: 6h and 5min

The months with the most sunshine are June and July (Average sunshine: 12h and 6min).
The months with the least sunshine are January, February and December (Average sunshine: 6h and 54min).

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Average sunshine days in January
Pasadena, CA

Average sunshine days in January - Pasadena, CA
  • Average sunshine days in January: 24.7 days

The month with the most sunshine days is June (27.5 days).
The month with the least sunshine days is February (21.5 days).

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Average UV index in January
Pasadena, CA

Average UV index in January - Pasadena, CA
  • Average UV index in January: 4

The months with the highest UV index are June, July, August and September (UV index 6).
The month with the lowest UV index is December (UV index 3).

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Average cloud cover in January
Pasadena, CA

Average cloud cover in January - Pasadena, CA
  • Average cloud cover in January: 20

The months with the most cloud cover are March and December (Cloud cover 21).
The month with the least cloud cover is August (Cloud cover 5).

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Average visibility in January
Pasadena, CA

Average visibility in January - Pasadena, 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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Pasadena, California, USA

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