January weather forecast and climate
Walnut Creek, CA

Vast fields and forest slopes of the iconic Mount Diablo State Park within the Walnut Creek in California
Vast fields and forest slopes of the iconic Mount Diablo State Park within the Walnut Creek in California

Weather in January

January, the same as December, in Walnut Creek, California, is a moderate winter month, with average temperature ranging between max 56.8°F (13.8°C) and min 42.4°F (5.8°C).

Temperature

In Walnut Creek, the average high-temperature is practically the same as in December - a still moderate 56.8°F (13.8°C). In Walnut Creek, California, in January, the average low-temperature is 42.4°F (5.8°C).

Humidity

In Walnut Creek, the average relative humidity in January is 73%.

Rainfall

In January, the rain falls for 9.3 days. Throughout January, 1.97" (50mm) of precipitation is accumulated. Throughout the year, in Walnut Creek, California, there are 68.7 rainfall days, and 11.26" (286mm) of precipitation is accumulated.

Daylight

The average length of the day in January is 9.9h.

Sunshine

The average sunshine in January is 6h.

UV index

January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index. A UV Index estimate of 3 to 5 represents a moderate threat to health from the exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 3 transform into the following instructions:
Take precautions - Protection against sun damage is advised. 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.
[Resources]

FAQ

What is the average humidity in January in Walnut Creek?

In Walnut Creek, California, the average relative humidity in January is 73%.

How much does it rain in Walnut Creek in January?

In Walnut Creek, in January, it is raining for 9.3 days, with typically 1.97" (50mm) of accumulated precipitation.

What is the average length of the day in January in Walnut Creek?

In Walnut Creek, California, the average length of the day in January is 9.9h.

How long on average sun shines in January in Walnut Creek?

The average sunshine in January in Walnut Creek, California, is 6h.

When is the lowest UV index in Walnut Creek?

Months with the lowest UV index in Walnut Creek are January, February, November and December, with an average maximum UV index of 3.

What is the UV index intensity in January in Walnut Creek?

In January, the average daily maximum UV index is 3. A UV Index estimate of 3 to 5 represents a medium health risk from the exposure to the Sun's UV radiation.

Average temperature in January
Walnut Creek, CA

Average temperature in January - Walnut Creek, CA
  • Average high temperature in January: 56.8°F

The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is December (55.4°F).

  • Average low temperature in January: 42.4°F

The month with the highest average low temperature is September (57.2°F).
The coldest months (with the lowest average low temperature) are January and December (42.4°F).

[Resources]

Average pressure in January
Walnut Creek, CA

Average pressure in January - Walnut Creek, CA
  • Average pressure in January: 30.14"

The month with the highest atmospheric pressure is January (30.14").
The month with the lowest atmospheric pressure is June (29.91").

[Resources]

Average wind speed in January
Walnut Creek, CA

Average wind speed in January - Walnut Creek, CA
  • Average wind speed in January: 4.6mph

The windiest month (with the highest average wind speed) is May (7.3mph).
The calmest month (with the lowest average wind speed) is November (4.4mph).

[Resources]

Average humidity in January
Walnut Creek, CA

Average humidity in January - Walnut Creek, CA
  • Average humidity in January: 73%

The month with the highest relative humidity is March (74%).
Months with the lowest relative humidity are September and October (58%).

[Resources]

Average rainfall in January
Walnut Creek, CA

Average rainfall in January - Walnut Creek, CA
  • Average rainfall in January: 1.97"

The wettest month (with the highest rainfall) is February (2.4").
The driest months (with the least rainfall) are July and August (0.04").

[Resources]

Average rainfall days in January
Walnut Creek, CA

Average rainfall days in January - Walnut Creek, CA
  • Average rainfall days in January: 9.3 days

The month with the highest number of rainy days is March (12.6 days).
The month with the least rainy days is August (0.8 days).

[Resources]

Average daylight in January /
Average sunshine in January
Walnut Creek, CA

Average daylight in January / Average sunshine in January - Walnut Creek, CA
  • Average daylight in January: 9.9h

The month with the longest days is June (Average daylight: 14.8h).
The month with the shortest days is December (Average daylight: 9.6h).

  • Average sunshine in January: 6h

The month with the most sunshine is July (Average sunshine: 12h).
The month with the least sunshine is December (Average sunshine: 5.8h).

[Resources]

Average sunshine days in January
Walnut Creek, CA

Average sunshine days in January - Walnut Creek, CA
  • Average sunshine days in January: 20.7 days

The month with the most sunshine days is August (29.6 days).
The month with the least sunshine days is March (17.5 days).

[Resources]

Average UV index in January
Walnut Creek, CA

Average UV index in January - Walnut Creek, CA
  • Average UV index in January: 3

Months with the highest UV index are June and July (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 3).

[Resources]

Average cloud cover in January
Walnut Creek, CA

Average cloud cover in January - Walnut Creek, CA
  • Average cloud cover in January: 34

The month with the most cloud cover is March (Cloud cover 36).
The month with the least cloud cover is July (Cloud cover 8).

[Resources]

Average visibility in January
Walnut Creek, CA

Average visibility in January - Walnut Creek, 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).

[Resources]

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location
* you will be automatically redirected to the weather forecast for your location