Climate and monthly weather forecastWest Lake Sammamish, WA
Climate and monthly weather forecast
Weather in January
January is a chilly winter month in West Lake Sammamish, Washington, with an average temperature fluctuating between 44.1°F (6.7°C) and 34.3°F (1.3°C). West Lake Sammamish, Washington, experiences a recorded average high-temperature of a chilly 44.1°F (6.7°C) in January, closely aligned with December's 42.3°F (5.7°C). Weather in January »Weather in February
February, the last month of the winter in West Lake Sammamish, is another chilly month, with an average temperature varying between 34°F (1.1°C) and 45.1°F (7.3°C). The arrival of February brings an average high-temperature of a still frosty 45.1°F (7.3°C), closely following the temperature pattern of January. Weather in February »Weather in March
The first month of the spring, March, is a fresh month in West Lake Sammamish, Washington, with an average temperature varying between 50°F (10°C) and 36.1°F (2.3°C). In March, West Lake Sammamish experiences a barely noticeable shift in meteorological conditions, with average high-temperatures moving from 45.1°F (7.3°C) in February to a fresh 50°F (10°C). Weather in March »Weather in April
April is a moderate spring month in West Lake Sammamish, Washington, with an average temperature varying between 38.8°F (3.8°C) and 55.8°F (13.2°C). April's arrival signals a subtle increase in average high-temperatures, moving from March's cool 50°F (10°C) to a refreshing 55.8°F (13.2°C). Weather in April »Weather in May
The last month of the spring, May, is an enjoyable month in West Lake Sammamish, Washington, with an average temperature fluctuating between 64.4°F (18°C) and 42.6°F (5.9°C). In West Lake Sammamish, the onset of May comes with a modest high-temperature shift, transitioning from April's refreshing 55.8°F (13.2°C) to an enjoyable 64.4°F (18°C). Weather in May »Weather in June
The first month of the summer, June, is a pleasant month in West Lake Sammamish, Washington, with temperature in the range of an average high of 69.3°F (20.7°C) and an average low of 46.4°F (8°C). West Lake Sammamish ushers in June with an average high-temperature of a pleasant 69.3°F (20.7°C), showing a close resemblance to the previous month. Weather in June »Weather in July
July in West Lake Sammamish, Washington, is a moderately hot summer month, with temperature in the range of an average high of 76.1°F (24.5°C) and an average low of 50.7°F (10.4°C). As July begins, there's a slight increase in the average high-temperature, moving 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 West Lake Sammamish, is also a moderately hot month, with an average temperature fluctuating between 52.2°F (11.2°C) and 76.5°F (24.7°C). August, marked by an average high-temperature of 76.5°F (24.7°C) and a low-temperature of 52.2°F (11.2°C), is the warmest month. Weather in August »Weather in September
September, the first month of the autumn in West Lake Sammamish, is still a pleasant month, with temperature in the range of an average low of 48.9°F (9.4°C) and an average high of 69.8°F (21°C). The beginning of September brings a minor change in the average high-temperature, shifting from a moderately hot 76.5°F (24.7°C) in August to an agreeable 69.8°F (21°C). Weather in September »Weather in October
October, the same as September, in West Lake Sammamish, Washington, is another mild autumn month, with temperature in the range of an average high of 58.5°F (14.7°C) and an average low of 43.7°F (6.5°C). In West Lake Sammamish, the average high-temperature in October decreases from a pleasant 69.8°F (21°C) in September to a mild 58.5°F (14.7°C). Weather in October »Weather in November
The last month of the autumn, November, is another chilly month in West Lake Sammamish, Washington, with an average temperature ranging between max 48.2°F (9°C) and min 38.3°F (3.5°C). The transition into November involves a decrease in the average high-temperature, falling from a refreshing 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 an icy month in West Lake Sammamish, Washington, with an average temperature varying between 42.3°F (5.7°C) and 33.6°F (0.9°C). Temperature records mark December as the coldest month, with highs averaging 42.3°F (5.7°C) and lows at 33.6°F (0.9°C). Weather in December »Updated: Aug 25, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
January, February and December, with an average relative humidity of 85%, are most humid months.
In West Lake Sammamish, during the entire year, the rain falls for 136.7 days and collects up to 13.39" (340mm) of precipitation.
January through April, November and December are months with snowfall.
Throughout the year, there are 9.3 snowfall days, and 3.27" (83mm) of snow is accumulated.
January and December, with an average of 4.2h of sunshine, are months with the least sunshine.
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index.
The month with the most snowfall is February, when snow falls for 3.2 days and typically aggregates up to 1.38" (35mm) of snow.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from PST to PDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from PDT to PST.
In West Lake Sammamish, Washington, snow does not fall in May through October.
The month with the longest days is June, with an average of 15h and 54min of daylight.
The months with the highest UV index are June and July, with an average maximum UV index of 5.
July is the least humid month, with an average relative humidity of 70%.
The months with the least rainfall are July and August Rain falls for 6.7 days and accumulates 0.35" (9mm) of rain.
The highest temperatures are recorded in August, with averages reaching a high of 76.5°F (24.7°C) and a low of 52.2°F (11.2°C).
The month with the most sunshine in West Lake Sammamish is August, with an average of 10.7h of sunshine.
West Lake Sammamish experiences its lowest temperatures in December, with an average peak of 42.3°F (5.7°C) and a low of 33.6°F (0.9°C).
The month with the most rainfall is December, when the rain falls for 14.1 days and typically aggregates up to 1.85" (47mm) of precipitation.
With an average of 8h and 30min of daylight, December has the shortest days of the year.
Average temperature
West Lake 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).
Average pressure
West Lake Sammamish, WA
- Average pressure in January:
30.1"Hg - Average pressure in February:
30.06"Hg - Average pressure in March:
30.01"Hg - Average pressure in April:
30.04"Hg - Average pressure in May:
30.02"Hg - Average pressure in June:
30.01"Hg
- Average pressure in July:
30.03"Hg - Average pressure in August:
30"Hg - Average pressure in September:
30.01"Hg - Average pressure in October:
30.04"Hg - Average pressure in November:
30.04"Hg - Average pressure in December:
30.09"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
West Lake Sammamish, WA
- Average wind speed in January:
5mph - Average wind speed in February:
4.6mph - Average wind speed in March:
4.8mph - Average wind speed in April:
4.3mph - Average wind speed in May:
3.8mph - Average wind speed in June:
3.6mph
- Average wind speed in July:
3.5mph - Average wind speed in August:
3.4mph - Average wind speed in September:
3.7mph - Average wind speed in October:
4.1mph - Average wind speed in November:
4.7mph - Average wind speed in December:
4.6mph
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
West Lake 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%).
Average rainfall
West Lake Sammamish, WA
- Average rainfall in January:
1.46" - Average rainfall in February:
1.26" - Average rainfall in March:
1.3" - Average rainfall in April:
1.22" - Average rainfall in May:
0.79" - Average rainfall in June:
0.75"
- Average rainfall in July:
0.35" - Average rainfall in August:
0.35" - Average rainfall in September:
1.06" - Average rainfall in October:
1.46" - Average rainfall in November:
1.54" - Average rainfall in December:
1.85"
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
West Lake Sammamish, WA
- Average rainfall days in January:
12.8 days - Average rainfall days in February:
11.2 days - Average rainfall days in March:
14.8 days - Average rainfall days in April:
14 days - Average rainfall days in May:
10.5 days - Average rainfall days in June:
10 days
- Average rainfall days in July:
6.7 days - Average rainfall days in August:
5.2 days - Average rainfall days in September:
10.1 days - Average rainfall days in October:
12.8 days - Average rainfall days in November:
14.5 days - Average rainfall days in December:
14.1 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
West Lake 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").
Average snowfall days
West Lake Sammamish, WA
- Average snowfall days in January:
1.8 days - Average snowfall days in February:
3.2 days - Average snowfall days in March:
2 days - Average snowfall days in April:
0.4 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0.1 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0.5 days - Average snowfall days in December:
1.3 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 / Average sunshine
West Lake Sammamish, WA
- Average daylight in January:
9h and 0min - Average daylight in February:
10h and 18min - Average daylight in March:
11h and 54min - Average daylight in April:
13h and 42min - Average daylight in May:
15h and 12min - Average daylight in June:
15h and 54min
- Average daylight in July:
15h and 30min - Average daylight in August:
14h and 12min - Average daylight in September:
12h and 30min - Average daylight in October:
10h and 48min - Average daylight in November:
9h and 18min - Average daylight in December:
8h and 30min
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 12min - Average sunshine in February:
4h and 24min - Average sunshine in March:
6h and 6min - Average sunshine in April:
7h and 54min - Average sunshine in May:
9h and 0min - Average sunshine in June:
9h and 18min
- Average sunshine in July:
10h and 30min - Average sunshine in August:
10h and 42min - Average sunshine in September:
9h and 12min - Average sunshine in October:
5h and 30min - Average sunshine in November:
4h and 30min - Average sunshine in December:
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).
Average sunshine days
West Lake Sammamish, WA
- Average sunshine days in January:
15.8 days - Average sunshine days in February:
13.8 days - Average sunshine days in March:
14.3 days - Average sunshine days in April:
13.9 days - Average sunshine days in May:
17.7 days - Average sunshine days in June:
16.3 days
- Average sunshine days in July:
22.3 days - Average sunshine days in August:
24 days - Average sunshine days in September:
17.7 days - Average sunshine days in October:
16.3 days - Average sunshine days in November:
13.5 days - Average sunshine days in December:
15.2 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
West Lake 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).
Average cloud cover
West Lake Sammamish, WA
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
West Lake 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).
