January weather forecast
Issaquah, WA

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Weather in January

The weather in January in Issaquah, Washington is consistent with the beginning of the year. This month faces the highest levels of relative humidity, at 85%, and reduced daylight hours of 9. Erratic weather conditions prevail, combining cold temperatures, rainfall, and snowfall. On average, January has to offer 13.5 days with precipitation and 1.3 days with snowfall. This gloomy performance piece is illuminated by an average of 4.1 hours of sunshine daily.

Temperature

Issaquah's average high-temperature in January sits at a frosty 44.2°F, showing little difference from the previous month. Issaquah's nights in January experience an average temperature drop to a wintry 34.3°F.

Humidity

The months with the highest humidity are January and February, with an average relative humidity of 85%.

Rainfall

In Issaquah, in January, it is raining for 13.5 days, with typically 1.85" of accumulated precipitation. In Issaquah, during the entire year, the rain falls for 127.4 days and collects up to 12.52" of precipitation.

Snowfall

January through April, November and December are months with snowfall in Issaquah. In January, it is snowing for 1.3 days. Throughout January, 0.63" of snow is accumulated. In Issaquah, Washington, during the entire year, snow falls for 5.9 days and aggregates up to 1.93" of snow.

Daylight

In Issaquah, the average length of the day in January is 8h and 58min.
On the first day of January in Issaquah, sunrise is at 7:55 am and sunset at 4:27 pm. On the last day of the month, sunrise is at 7:35 am and sunset at 5:07 pm PST.

Sunshine

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

UV index

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for the average person.
Note: In January, the average maximum UV index of 2 translates into the following recommendations:
Extended exposure to the sun should always be avoided by children, infants, and those with sensitive skin. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly. Take heed! Reflection from the snow can almost amplify the Sun's UV radiation by double.
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FAQ

How cold does it get in Issaquah in January?

The average high-temperature, in January, in Issaquah, is 44.2°F, while the average low-temperature is 34.3°F.

What is the most humid month in Issaquah?

The months with the highest humidity in Issaquah, Washington, are January and February, with an average relative humidity of 85%.

What is the average humidity in January in Issaquah?

The average relative humidity in January 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" of precipitation.

How much does it snow in Issaquah in January?

In Issaquah, Washington, in January, during 1.3 snowfall days, 0.63" of snow is typically accumulated.

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

In January, the average day length in Issaquah, Washington, is 8h and 58min.

When are sunrise and sunset in January in Issaquah?

On the first day of January, sunrise is at 7:55 am and sunset at 4:27 pm. On the last day of the month, sunrise is at 7:35 am and sunset at 5:07 pm PST.

How many hours of sunshine does Issaquah have in January?

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

When is the lowest UV index in Issaquah?

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

What is the UV index intensity in January in Issaquah?

The average daily maximum UV index in January is 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to Sun's UV rays.
Average high temperature
Average low temperature
Average pressure
Average wind speed
Average max. wind speed
Average wind speed gusts
Average humidity
Average rainfall
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

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"Hg

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

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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%

The 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").
The 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).
The 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 and 0min

The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).

  • Average sunshine in January: 4h and 1min

The month with the most sunshine is August (Average sunshine: 10h and 30min).
The month with the least sunshine is December (Average sunshine: 4h and 0min).

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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).
The 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

The 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

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

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Issaquah, Washington, USA

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