January weather forecast
Sammamish, WA

Dense pine tree cover and houses in the town of Sammamish, Washington, in the Pine Lake area
Dense pine tree cover and houses in the town of Sammamish, Washington, in the Pine Lake area

Weather in January

January in Sammamish, Washington, is a chilly winter month, with temperature in the range of an average low of 34.3°F (1.3°C) and an average high of 44.1°F (6.7°C).

Temperature

In Sammamish, the average high-temperature in January is essentially the same as in December - a frosty 44.1°F (6.7°C). In January, in Sammamish, the average low-temperature is 34.3°F (1.3°C).

Humidity

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

Rainfall

In January, the rain falls for 12.8 days. Throughout January, 1.46" (37mm) of precipitation is accumulated. In Sammamish, during the entire year, the rain falls for 136.7 days and collects up to 13.39" (340mm) of precipitation.

Snowfall

Months with snowfall are January through April, November and December. In Sammamish, in January, snow falls for 1.8 days, with typically accumulated 0.67" (17mm) of snow. In Sammamish, during the entire year, snow falls for 9.3 days and aggregates up to 3.27" (83mm) of snow.

Daylight

The average length of the day in January in Sammamish is 8h and 58min.
On the first day of January in Sammamish, sunrise is at 7:56 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

January and December, with an average of 4.2h of sunshine, are months with the least sunshine.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for average individuals.
Note: The average daily UV index of 2 in January transform into the following instructions:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. 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. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in January in Sammamish?

In January, in Sammamish, the average high-temperature is 44.1°F (6.7°C), and the average low-temperature is 34.3°F (1.3°C).

What are the most humid months in Sammamish?

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

What is the average humidity in January in Sammamish?

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

How much does it rain in Sammamish in January?

In Sammamish, Washington, in January, during 12.8 rainfall days, 1.46" (37mm) of precipitation is typically accumulated.

How many days does it snow in January in Sammamish?

In January, in Sammamish, Washington, it is snowing for 1.8 days. Throughout January, 0.67" (17mm) of snow is accumulated.

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

The average day length in January is 8h and 58min.

What time are sunrise and sunset in January in Sammamish?

On the first day of January in Sammamish, sunrise is at 7:56 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.

What are the months with the least sunshine in Sammamish?

The months with the least sunshine in Sammamish are January and December, with an average of 4.2h of sunshine.

How long on average sun shines in January in Sammamish?

In January, the average sunshine duration in Sammamish is 4.2h.

When is the lowest UV index in Sammamish?

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

How high is the UV index in January in Sammamish?

The average daily maximum UV index in January in Sammamish is 2. A UV Index estimate of 2, and below, represents a low health threat from unprotected exposure to UV radiation.
Average max. wind speed
Average humidity
Average rainfall days
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in January
Sammamish, WA

Average temperature in January - Sammamish, WA
  • Average high temperature in January: 44.1°F

The warmest month (with the highest average high temperature) is August (76.5°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 (52.2°F).
The coldest month (with the lowest average low temperature) is December (33.6°F).

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Average pressure in January
Sammamish, WA

Average pressure in January - Sammamish, 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
Sammamish, WA

Average wind speed in January - Sammamish, WA
  • Average wind speed in January: 5mph

The windiest month (with the highest average wind speed) is January (5mph).
The calmest month (with the lowest average wind speed) is August (3.4mph).

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Average humidity in January
Sammamish, WA

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

The months with the highest relative humidity are January, February and December (85%).
The month with the lowest relative humidity is July (70%).

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Average rainfall in January
Sammamish, WA

Average rainfall in January - Sammamish, WA
  • Average rainfall in January: 1.46"

The wettest month (with the highest rainfall) is December (1.85").
The driest months (with the least rainfall) are July and August (0.35").

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Average rainfall days in January
Sammamish, WA

Average rainfall days in January - Sammamish, WA
  • Average rainfall days in January: 12.8 days

The month with the highest number of rainy days is March (14.8 days).
The month with the least rainy days is August (5.2 days).

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Average snowfall in January
Sammamish, WA

Average snowfall in January - Sammamish, WA
  • Average snowfall in January: 0.67"

The month with the highest snowfall is February (1.38").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in January
Sammamish, WA

Average snowfall days in January - Sammamish, WA
  • Average snowfall days in January: 1.8 days

The month with the highest number of snowfall days is February (3.2 days).
The months with the least snowfall days are May, June, July, August and October (0 days).

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

Average daylight in January / Average sunshine in January - Sammamish, WA
  • Average daylight in January: 8h and 58min

The month with the longest days is June (Average daylight: 15h and 55min).
The month with the shortest days is December (Average daylight: 8h and 30min).

  • Average sunshine in January: 4h and 12min

The month with the most sunshine is August (Average sunshine: 10h and 42min).
The months with the least sunshine are January and December (Average sunshine: 4h and 12min).

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Average sunshine days in January
Sammamish, WA

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

The month with the most sunshine days is August (24 days).
The month with the least sunshine days is November (13.5 days).

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Average UV index in January
Sammamish, WA

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

The months with the highest UV index are June and 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
Sammamish, WA

Average cloud cover in January - Sammamish, WA
  • Average cloud cover in January: 56

The month with the most cloud cover is December (Cloud cover 57).
The month with the least cloud cover is August (Cloud cover 26).

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Average visibility in January
Sammamish, WA

Average visibility in January - Sammamish, WA
  • Average visibility in January: 5mi

The months with the highest visibility are June, July, August and September (6mi).
The months with the lowest visibility are January, February, March, April, May, October, November and December (5mi).

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