Climate and monthly 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 an average temperature fluctuating between 34.3°F (1.3°C) and 44.1°F (6.7°C). In Sammamish, the average high-temperature in January is relatively the same as in December - a frosty 44.1°F (6.7°C). Weather in January »

Weather in February

The last month of the winter, February, is another chilly month in Sammamish, Washington, with an average temperature varying between 45.1°F (7.3°C) and 34°F (1.1°C). In February, the average high-temperature is practically the same as in January - a still chilly 45.1°F (7.3°C). Weather in February »

Weather in March

The first month of the spring, March, is a fresh month in Sammamish, Washington, with an average temperature ranging between max 50°F (10°C) and min 36.1°F (2.3°C). In Sammamish, Washington, the average high-temperature in March is essentially the same as in February - a fresh 50°F (10°C). Weather in March »

Weather in April

April is a mild spring month in Sammamish, Washington, with an average temperature ranging between min 38.8°F (3.8°C) and max 55.8°F (13.2°C). In Sammamish, the average high-temperature in April slightly increases from a fresh 50°F (10°C) in March to a mild 55.8°F (13.2°C). Weather in April »

Weather in May

The last month of the spring, May, is an enjoyable month in Sammamish, Washington, with an average temperature varying between 64.4°F (18°C) and 42.6°F (5.9°C). In Sammamish, the average high-temperature in May slightly increases from a mild 55.8°F (13.2°C) in April to an enjoyable 64.4°F (18°C). Weather in May »

Weather in June

The first month of the summer, June, is an agreeable month in Sammamish, Washington, with an average temperature varying between 46.4°F (8°C) and 69.3°F (20.7°C). In Sammamish, the average high-temperature in June is almost the same as in May - a pleasant 69.3°F (20.7°C). Weather in June »

Weather in July

July in Sammamish, Washington, is a moderately hot summer month, with an average temperature varying between 50.7°F (10.4°C) and 76.1°F (24.5°C). In July, the average high-temperature marginally rises from a pleasant 69.3°F (20.7°C) in June to a moderately hot 76.1°F (24.5°C). Weather in July »

Weather in August

August, the last month of the summer in Sammamish, is also a moderately hot month, with an average temperature ranging between max 76.5°F (24.7°C) and min 52.2°F (11.2°C). August is the warmest month, with an average high-temperature of 76.5°F (24.7°C) and an average low-temperature of 52.2°F (11.2°C). Weather in August »

Weather in September

The first month of the autumn, September, is also an agreeable month in Sammamish, Washington, with temperature in the range of an average high of 69.8°F (21°C) and an average low of 48.9°F (9.4°C). In September, the average high-temperature marginally drops from a moderately hot 76.5°F (24.7°C) in August to a pleasant 69.8°F (21°C). Weather in September »

Weather in October

October, the same as September, in Sammamish, Washington, is another mild autumn month, with an average temperature ranging between min 43.7°F (6.5°C) and max 58.5°F (14.7°C). In October, the average high-temperature drops from a pleasant 69.8°F (21°C) in September to a moderate 58.5°F (14.7°C). Weather in October »

Weather in November

November, the last month of the autumn in Sammamish, is another chilly month, with an average temperature fluctuating between 48.2°F (9°C) and 38.3°F (3.5°C). In November, the average high-temperature decreases from a moderate 58.5°F (14.7°C) in October to a frosty 48.2°F (9°C). Weather in November »

Weather in December

The first month of the winter, December, is also a wintry month in Sammamish, Washington, with an average temperature varying between 42.3°F (5.7°C) and 33.6°F (0.9°C). With an average high-temperature of 42.3°F (5.7°C) and an average low-temperature of 33.6°F (0.9°C), December is the coldest month. Weather in December »
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FAQ

What are the most humid months in Sammamish?

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

How much does it rain in Sammamish?

In Sammamish, during the entire year, the rain falls for 136.7 days and collects up to 13.39" (340mm) of precipitation.

When does it snow in Sammamish?

January through April, November and December are months with snowfall.

How many days does it snow in Sammamish?

In Sammamish, during the entire year, snow falls for 9.3 days and aggregates up to 3.27" (83mm) of snow.

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.

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 in Sammamish.

When does it snow the most in Sammamish?

The month with the most snowfall in Sammamish is February, when snow falls for 3.2 days and typically aggregates up to 1.38" (35mm) of snow.

When is Daylight Saving Time (DST) in Sammamish?

On Sunday, March 13. 2022, at 2:00 am, Daylight Saving Time starts, and the time zone changes from PST to PDT. Daylight Saving Time ends Sunday, November 6. 2022, at 2:00 am, and the time zone reverts from PDT to PST.

When it does not snow in Sammamish?

May through October are months without snowfall in Sammamish, Washington.

When are the longest days in Sammamish?

The month with the longest days is June, with an average of 15h and 55min of daylight.

When is the highest UV index in Sammamish?

The months with the highest UV index are June and July, with an average maximum UV index of 5.

What is the least humid month in Sammamish?

July is the least humid month, with an average relative humidity of 70%.

What is the driest month in Sammamish?

The months with the least rainfall in Sammamish are July and August Rain falls for 6.7 days and accumulates 0.35" (9mm) of rain.

What is the warmest month in Sammamish?

With an average high-temperature of 76.5°F (24.7°C) and an average low-temperature of 52.2°F (11.2°C), August is the warmest month in Sammamish, Washington.

What month has the most sunshine in Sammamish?

August has the most sunshine of the year in Sammamish, Washington, with an average of 10.7h of sunshine.

What is the coldest month in Sammamish?

The coldest month in Sammamish is December, with an average high-temperature of 42.3°F (5.7°C) and an average low-temperature of 33.6°F (0.9°C).

What is the wettest month in Sammamish?

The month with the most rainfall in Sammamish is December, when the rain falls for 14.1 days and typically aggregates up to 1.85" (47mm) of precipitation.

What is the month with the shortest days in Sammamish?

With an average of 8h and 30min of daylight, December has the shortest days of the year in Sammamish, Washington.

Average temperature
Sammamish, WA

Average temperature - Sammamish, WA

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).

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
Sammamish, WA

Average pressure - Sammamish, WA

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
Sammamish, WA

Average wind speed - Sammamish, WA

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
Sammamish, WA

Average humidity - Sammamish, WA

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
Sammamish, WA

Average rainfall - Sammamish, WA

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
Sammamish, WA

Average rainfall days - Sammamish, WA

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
Sammamish, WA

Average snowfall - Sammamish, WA

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
Sammamish, WA

Average snowfall days - Sammamish, WA

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 / Average sunshine
Sammamish, WA

Average daylight / Average sunshine - Sammamish, WA

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).

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
Sammamish, WA

Average sunshine days - Sammamish, WA

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
Sammamish, WA

Average UV index - Sammamish, WA

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 visibility
Sammamish, WA

Average visibility - Sammamish, WA

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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