Climate and monthly weather forecastVashon, WA
Climate and monthly weather forecast
Weather in January
January, the same as December, in Vashon, Washington, is a frosty winter month, with an average temperature ranging between min 35.2°F (1.8°C) and max 44.6°F (7°C). Vashon experiences an average high-temperature of a still chilly 44.6°F (7°C) with the onset of January, subtly varied from December's 43.5°F (6.4°C). Weather in January »Weather in February
February, the last month of the winter in Vashon, is another chilly month, with an average temperature ranging between min 34.9°F (1.6°C) and max 46°F (7.8°C). An average high-temperature of a still chilly 46°F (7.8°C) marks February, exhibiting a close resemblance to the conditions in January. Weather in February »Weather in March
The first month of the spring, March, is a fresh month in Vashon, Washington, with an average temperature varying between 51.1°F (10.6°C) and 37.2°F (2.9°C). With the onset of March, a modest change to a cool 51.1°F (10.6°C) from February's 46°F (7.8°C) is noted in high-temperature. Weather in March »Weather in April
April is a moderate spring month in Vashon, Washington, with temperature in the range of an average low of 39.7°F (4.3°C) and an average high of 56.7°F (13.7°C). As April sets, the average high-temperature shows a slight increase, moving up from a fresh 51.1°F (10.6°C) in March to a mild 56.7°F (13.7°C). Weather in April »Weather in May
May, the last month of the spring in Vashon, is an enjoyable month, with an average temperature ranging between max 65.3°F (18.5°C) and min 44.4°F (6.9°C). May's onset brings a subtle temperature rise, moving from a refreshing 56.7°F (13.7°C) in April to a comfortable 65.3°F (18.5°C). Weather in May »Weather in June
The first month of the summer, June, is an agreeable month in Vashon, Washington, with an average temperature varying between 70°F (21.1°C) and 48°F (8.9°C). Vashon's shift into June sets the average high-temperature at an agreeable 70°F (21.1°C), a figure that deviates only slightly from May's 65.3°F (18.5°C). Weather in June »Weather in July
July is a warm summer month in Vashon, Washington, with an average temperature fluctuating between 77.2°F (25.1°C) and 52.5°F (11.4°C). With the start of July, the average high-temperature marginally shifts from June's pleasant 70°F (21.1°C) to a warm 77.2°F (25.1°C). Weather in July »Weather in August
The last month of the summer, August, is another warm month in Vashon, Washington, with an average temperature ranging between max 77.7°F (25.4°C) and min 53.6°F (12°C). Vashon's August weather reaches an average high of 77.7°F (25.4°C) and an average low of 53.6°F (12°C), making it the warmest month. Weather in August »Weather in September
September, the first month of the autumn in Vashon, is also an agreeable month, with an average temperature ranging between max 70.3°F (21.3°C) and min 50.4°F (10.2°C). The onset of September results in a small decrease in the average high-temperature, moderately receding from a moderately hot 77.7°F (25.4°C) in August to an agreeable 70.3°F (21.3°C). Weather in September »Weather in October
October, the same as September, in Vashon, Washington, is another refreshing autumn month, with an average temperature fluctuating between 44.8°F (7.1°C) and 59°F (15°C). Vashon's weather in October involves a decrease in the average high-temperature, moving down from September's agreeable 70.3°F (21.3°C) to a mild 59°F (15°C). Weather in October »Weather in November
The last month of the autumn, November, is also a frosty month in Vashon, Washington, with an average temperature varying between 49.1°F (9.5°C) and 39°F (3.9°C). Vashon in November experiences a subtle temperature decline, with average high-temperatures reducing from a moderate 59°F (15°C) in October to a frosty 49.1°F (9.5°C). Weather in November »Weather in December
The first month of the winter, December, is still a chilly month in Vashon, Washington, with an average temperature ranging between min 34.3°F (1.3°C) and max 43.5°F (6.4°C). Vashon's December weather reaches an average high of 43.5°F (6.4°C) and an average low of 34.3°F (1.3°C), making it the coldest month. Weather in December »Updated: Jul 21, 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 and December, with an average relative humidity of 85%, are most humid months.
Throughout the year, there are 138.2 rainfall days, and 14.09" (358mm) of precipitation is accumulated.
January through March, November and December are months with snowfall in Vashon.
Throughout the year, there are 9.8 snowfall days, and 4.72" (120mm) of snow is accumulated.
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Vashon, Washington.
The month with the most snowfall in Vashon is February, when snow falls for 3.4 days and typically aggregates up to 2.52" (64mm) 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.
April through October are months without snowfall.
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 through August, with an average maximum UV index of 5.
With an average relative humidity of 68%, July is the least humid month.
The month with the least rainfall is July, when the rain falls for 6.3 days and typically collects 0.31" (8mm) of precipitation.
In Vashon, the average highest temperatures are observed in August, with a high of 77.7°F (25.4°C) and a low of 53.6°F (12°C).
August has the most sunshine of the year, with an average of 10.7h of sunshine.
Vashon notes the coldest temperatures in December, with a average high of 43.5°F (6.4°C) and a low of 34.3°F (1.3°C).
December is the month with the most rainfall. Rain falls for 13.5 days and accumulates 2.2" (56mm) of precipitation.
The month with the shortest days is December, with an average of 8h and 30min of daylight.
The month with the least sunshine is December, with an average of 4.1h of sunshine.
Average temperature
Vashon, WA
The warmest month (with the highest average high temperature) is August (77.7°F).
The month with the lowest average high temperature is December (43.5°F).
The month with the highest average low temperature is August (53.6°F).
The coldest month (with the lowest average low temperature) is December (34.3°F).
Average pressure
Vashon, 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:
30.05"Hg - Average pressure in May:
30.02"Hg - Average pressure in June:
30.02"Hg
- Average pressure in July:
30.03"Hg - Average pressure in August:
30.01"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:
30.08"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are March, August and September (30.01"Hg).
Average wind speed
Vashon, WA
- Average wind speed in January:
5.2mph - Average wind speed in February:
5.2mph - Average wind speed in March:
5.3mph - Average wind speed in April:
4.8mph - Average wind speed in May:
4.1mph - Average wind speed in June:
4mph
- Average wind speed in July:
3.6mph - Average wind speed in August:
3.6mph - Average wind speed in September:
3.9mph - Average wind speed in October:
4.5mph - Average wind speed in November:
5mph - Average wind speed in December:
4.8mph
The windiest month (with the highest average wind speed) is March (5.3mph).
The calmest months (with the lowest average wind speed) are July and August (3.6mph).
Average humidity
Vashon, WA
The months with the highest relative humidity are January and December (85%).
The month with the lowest relative humidity is July (68%).
Average rainfall
Vashon, WA
- Average rainfall in January:
1.54" - Average rainfall in February:
1.3" - Average rainfall in March:
1.22" - Average rainfall in April:
1.22" - Average rainfall in May:
1.06" - Average rainfall in June:
0.79"
- Average rainfall in July:
0.31" - Average rainfall in August:
0.47" - Average rainfall in September:
0.91" - Average rainfall in October:
1.42" - Average rainfall in November:
1.65" - Average rainfall in December:
2.2"
The wettest month (with the highest rainfall) is December (2.2").
The driest month (with the least rainfall) is July (0.31").
Average rainfall days
Vashon, WA
- Average rainfall days in January:
12.3 days - Average rainfall days in February:
11.4 days - Average rainfall days in March:
14.1 days - Average rainfall days in April:
14.9 days - Average rainfall days in May:
12.3 days - Average rainfall days in June:
10.5 days
- Average rainfall days in July:
6.3 days - Average rainfall days in August:
5.7 days - Average rainfall days in September:
10.5 days - Average rainfall days in October:
12.5 days - Average rainfall days in November:
14.2 days - Average rainfall days in December:
13.5 days
The month with the highest number of rainy days is April (14.9 days).
The month with the least rainy days is August (5.7 days).
Average snowfall
Vashon, WA
The month with the highest snowfall is February (2.52").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days
Vashon, WA
- Average snowfall days in January:
1.9 days - Average snowfall days in February:
3.4 days - Average snowfall days in March:
1.8 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 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0.7 days - Average snowfall days in December:
1.6 days
The month with the highest number of snowfall days is February (3.4 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Vashon, WA
- Average daylight in January:
9h and 0min - Average daylight in February:
10h and 18min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 42min - Average daylight in May:
15h and 6min - 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 18min - Average sunshine in March:
6h and 12min - 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 36min - Average sunshine in November:
4h and 30min - Average sunshine in December:
4h and 6min
The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 4h and 6min).
Average sunshine days
Vashon, WA
- Average sunshine days in January:
15.6 days - Average sunshine days in February:
13 days - Average sunshine days in March:
14.3 days - Average sunshine days in April:
13.2 days - Average sunshine days in May:
15.8 days - Average sunshine days in June:
17.1 days
- Average sunshine days in July:
22.6 days - Average sunshine days in August:
22.8 days - Average sunshine days in September:
17.4 days - Average sunshine days in October:
16.7 days - Average sunshine days in November:
13.9 days - Average sunshine days in December:
14.2 days
The month with the most sunshine days is August (22.8 days).
The month with the least sunshine days is February (13 days).
Average UV index
Vashon, WA
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover
Vashon, WA
The month with the most cloud cover is December (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 26).
Average visibility
Vashon, WA
The months with the highest visibility are May, June, July, August and September (6mi).
The months with the lowest visibility are January, February, March, April, October, November and December (5mi).
