January weather forecast and climate
Issaquah, WA

Weather in January

January in Issaquah, Washington, is a chilly winter month, with average temperature varying between 34.3°F (1.3°C) and 44.2°F (6.8°C).

Temperature

In Issaquah, Washington, the average high-temperature is almost the same as in December - a frosty 44.2°F (6.8°C). In Issaquah, in January, the average low-temperature is 34.3°F (1.3°C).

Humidity

January and February, with an average relative humidity of 85%, are most humid months in Issaquah.

Rainfall

In Issaquah, in January, during 13.5 rainfall days, 1.85" (47mm) of precipitation is typically accumulated. Throughout the year, there are 127.4 rainfall days, and 12.52" (318mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Issaquah, Washington, are January through April, November and December. In Issaquah, in January, during 1.3 snowfall days, 0.63" (16mm) of snow is typically accumulated. In Issaquah, during the entire year, snow falls for 5.9 days, and aggregates up to 1.93" (49mm) of snow.

Daylight

In Issaquah, the average length of the day in January is 9h.

Sunshine

The average sunshine in January is 4.1h.

UV index

Months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low health risk from the exposure to the Sun's UV radiation for the ordinary person.
Note: The daily maximum UV index of 2 in January interpret into the following advice:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What are the most humid months in Issaquah?

January and February, with an average relative humidity of 85%, are most humid months in Issaquah.

What is the average humidity in January in Issaquah?

In January, the average relative humidity in Issaquah, Washington, is 85%.

How many days does it rain in January in Issaquah?

In Issaquah, Washington, during January, the rain falls for 13.5 days and regularly aggregates up to 1.85" (47mm) of precipitation.

How many days does it snow in January in Issaquah?

In January, in Issaquah, it is snowing for 1.3 days. Throughout January, 0.63" (16mm) of snow is accumulated.

What is the average length of the day in January in Issaquah?

In January, the average length of the day in Issaquah is 9h.

How many hours of sunshine does Issaquah have in January?

In January, the average sunshine in Issaquah is 4.1h.

When is the lowest UV index in Issaquah?

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Issaquah, Washington.

What is the UV index intensity in January in Issaquah?

In Issaquah, the average daily maximum UV index in January is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unsafe exposure to the Sun's UV rays.

Average temperature in January
Issaquah, WA

Average temperature in January - Issaquah, WA
  • Average high temperature in January: 44.2°F

The warmest month (with the highest average high temperature) is August (77°F).
The month with the lowest average high temperature is December (42.3°F).

  • Average low temperature in January: 34.3°F

The month with the highest average low temperature is August (51.4°F).
The coldest months (with the lowest average low temperature) are February and December (33.4°F).

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Average pressure in January
Issaquah, WA

Average pressure in January - Issaquah, WA
  • Average pressure in January: 30.1"

The month with the highest atmospheric pressure is January (30.1").
The month with the lowest atmospheric pressure is August (30").

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Average wind speed in January
Issaquah, WA

Average wind speed in January - Issaquah, WA
  • Average wind speed in January: 5.1mph

The windiest month (with the highest average wind speed) is January (5.1mph).
The calmest month (with the lowest average wind speed) is August (3.4mph).

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Average humidity in January
Issaquah, WA

Average humidity in January - Issaquah, WA
  • Average humidity in January: 85%

Months with the highest relative humidity are January and February (85%).
The month with the lowest relative humidity is July (69%).

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Average rainfall in January
Issaquah, WA

Average rainfall in January - Issaquah, WA
  • Average rainfall in January: 1.85"

The wettest month (with the highest rainfall) is December (2.01").
The driest month (with the least rainfall) is July (0.24").

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Average rainfall days in January
Issaquah, WA

Average rainfall days in January - Issaquah, WA
  • Average rainfall days in January: 13.5 days

The month with the highest number of rainy days is March (14.8 days).
The month with the least rainy days is August (4.3 days).

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Average snowfall in January
Issaquah, WA

Average snowfall in January - Issaquah, WA
  • Average snowfall in January: 0.63"

The month with the highest snowfall is February (0.94").
Months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in January
Issaquah, WA

Average snowfall days in January - Issaquah, WA
  • Average snowfall days in January: 1.3 days

The month with the highest number of snowfall days is February (2.5 days).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in January /
Average sunshine in January
Issaquah, WA

Average daylight in January / Average sunshine in January - Issaquah, WA
  • Average daylight in January: 9h

The month with the longest days is June (Average daylight: 15.9h).
The month with the shortest days is December (Average daylight: 8.5h).

  • Average sunshine in January: 4.1h

The month with the most sunshine is August (Average sunshine: 10.5h).
The month with the least sunshine is December (Average sunshine: 4h).

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Average sunshine days in January
Issaquah, WA

Average sunshine days in January - Issaquah, WA
  • Average sunshine days in January: 15.8 days

The month with the most sunshine days is August (25 days).
The month with the least sunshine days is February (12.9 days).

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Average UV index in January
Issaquah, WA

Average UV index in January - Issaquah, WA
  • Average UV index in January: 2

The month with the highest UV index is July (UV index 5).
Months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in January
Issaquah, WA

Average cloud cover in January - Issaquah, WA
  • Average cloud cover in January: 58

Months with the most cloud cover are January and December (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 27).

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Average visibility in January
Issaquah, WA

Average visibility in January - Issaquah, WA
  • Average visibility in January: 4mi

Months with the highest visibility are July and August (6mi).
Months with the lowest visibility are January, February and December (4mi).

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