January weather forecast
Sammamish, WA

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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

The start of a new year in Sammamish, Washington brings along colder temperatures, making it one of the more chillier months in this region. The average low temperatures revolve around 34.3°F (1.3°C) and the high around 44.1°F (6.7°C). Comparing this to the subsequent month, February, temperatures are similar but marginally less. This lower temperature plays a role in the high volume of snowfall recorded during this month, with January receiving 0.67" (17mm) of snowfall making it a wonderful option for snow sports. The city experiences a relative humidity of 85% in January, indicating a vast amount of moisture in the air.

Temperature

Sammamish signifies an average high-temperature of a chilly 44.1°F (6.7°C) in January, closely mirroring the 42.3°F (5.7°C) of December. An average low-temperature of 34.3°F (1.3°C) is anticipated throughout the nights during January.

Humidity

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

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

January through April, November and December are months with snowfall. In Sammamish, in January, during 1.8 snowfall days, 0.67" (17mm) of snow is typically accumulated. Throughout the year, there are 9.3 snowfall days, and 3.27" (83mm) of snow is accumulated.

Daylight

In Sammamish, the average length of the day in January is 8h and 58min.
On the first day of the month, sunrise is at 7:56 am and sunset at 4:27 pm. On the last day of January, sunrise is at 7:35 am and sunset at 5:07 pm PST.

Sunshine

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

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 of 2, and less, symbolizes a minimal health hazard from unsafe exposure to UV radiation for average individuals.
Note: In January, a daily maximum UV index of 2 leads to the following instructions:
Protection from prolonged sun exposure is necessary for babies, children, and individuals with sensitive skin. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. On your guard! Snow's reflection can almost double the intensity of the Sun's UV radiation.
Updated: Aug 31, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is January cold?

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

What are the most humid months?

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

What is the average humidity in January?

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

How many days does it rain in January?

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

How much does it snow in January?

In January, 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?

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

When is the sunrise / sunset in January?

On the first day of January, 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?

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

How long on average sun shines in January?

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

What is the month with the lowest UV index in Sammamish?

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

How high is the UV index in January?

In Sammamish, the average daily maximum UV index in January is 2. A UV Index estimate of 2, and below, represents a low health threat from unsafe exposure to Sun's UV rays.
Average max. wind speed
Average humidity
Average rainfall days
Average snowfall days
Average daylight
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).

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).

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).

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%).

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").

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).

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").

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).

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

Average daylight in January / Average sunshine in January - Sammamish, 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 42min).
The months with the least sunshine are January and December (Average sunshine: 4h and 12min).

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).

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).

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).

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).

Sammamish, Washington, USA

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