Climate and monthly weather forecastBellevue, WA
Climate and monthly weather forecast
The climate of Bellevue
Bellevue, Washington, USA, falls into the category of Mediterranean warm summer climate, as per the Köppen climate classification. Its geographical position, relatively near to the Pacific Ocean while sheltered by the Cascade mountain range, plays a significant role in its climate.Throughout the year, the city experiences moderate temperatures - from lows of 34.7°F (1.5°C) in winter months to highs of 76.6°F (24.8°C) in peak summer. The average rainfall ranges from as low as 0.24" (6mm) in July to as high as 2.01" (51mm) in December. An interesting pattern can be observed in the humidity, peaking at 85% in January and dropping to a low of 69% in July.
The city gets an average of 5 to 6 hours of sunshine per day, and the visibility spans roughly 5 miles throughout the year, irrespective of the season. Uniqueness in Bellevue's weather patterns can be identified during December and January when the city experiences an influx in rainfall, soaring to over 1.5" (38mm) and 2.01" (51mm), respectively.
The best time to visit Bellevue
Taking into account factors such as temperature, rainfall, and hours of daylight, the best time to visit Bellevue falls between May and September. During these months, the average temperatures sit comfortably between 55.9°F (13.3°C) and 76.6°F (24.8°C). In addition to this, rainfall drops down to 0.79" (20mm) in May followed by a low of 0.24" (6mm) in July - making these months ideal for outdoor activities.Sunlight hours are at their maximum in this period, reaching their peak in June with 15.9 hours of daylight, accompanied by an impressive 9.4 hours of sunshine. The UV index falls within the range of 4 to 6, which is considered moderate, emphasizing the need for sun protection during outings.
The worst time to visit Bellevue
The least favorable time to visit Bellevue is between late November and February. During these months, temperatures can drop to a chilling low of 34.7°F (1.5°C), while high temperatures barely escape the 40's, hovering between 42.8°F (6°C) and 44.4°F (6.9°C).In addition to this, rainfall skyrockets to an average of 1.3" (33mm) in November and peaks at 2.01" (51mm) in December. Daylight hours are scarce, reaching their lowest in December, with only 8.5 hours of daylight and a mere 4.2 hours of sunshine. This period also sees an increase in relative humidity, climbing up to 84%.
Spring weather in Bellevue
Spring in Bellevue introduces a shift from chilly winters to more moderate temperatures. From March to May, the high temperatures rise consistently from 50.5°F (10.3°C) to 64.6°F (18.1°C), while the lows increase from 36.9°F (2.7°C) to 44.1°F (6.7°C).Even though the rainfall in spring ranges from 1.02" (26mm) to 0.79" (20mm), it sees quite a drop in the number of rainfall days, from 13.7 days in March to 10.1 in May. Sunlight hours increase, with May reaching up to 15.2 hours of daylight. The UV index during this season transitions from a low of 2 in March to a moderate 4 by May.
Summer weather in Bellevue
The summer months of June through August provide the perfect conditions for outdoor activities with high temperatures between 69.3°F (20.7°C) and 76.6°F (24.8°C). The rainfall drops to 0.63" (16mm) in June and reaches a yearly low of 0.24" (6mm) in July, with only 5.5 rainfall days.In terms of sunlight, summer shines brightest with between 15.5 hours (July) and 14.2 hours (August) of daylight, and a generous 9.4 hours to 10.7 hours of sunshine everyday. Take heed of the higher UV index, which rises to a maximum of 6 in July.
Autumn weather in Bellevue
Autumn sees a reversal in summer's warmth starting with an average high of 70°F (21.1°C) in September, which decreases to 48.6°F (9.2°C) by November. The low temperatures similarly decrease from 50°F (10°C) to 39°F (3.9°C) as the season progresses. Rainfall begins to rise, doubling from 0.63" (16mm) in September to 1.3" (33mm) by November.While October retains 10.8 hours of daylight daily, November sees a dip to 9.3 hours. The UV index falls from a moderate 4 in September to a low of 2 in November.
Winter weather in Bellevue
Winter in Bellevue, spanning December through February, is marked by cool temperatures and increased humidity. The average high decreases from 42.8°F (6°C) in December to 44.4°F (6.9°C) in February, while the average low hovers around the mid 30's°F.Rainfall, on the contrary, peaks in these months with December reaching a high of 2.01" (51mm). Daylight durations drop to their annual low, with only 8.5 hours in December. Sunshine hours are at their minimum, averaging between 4.2 hours and 4.5 hours per day. Albeit rarely, Bellevue can also experience snowfall during these winter months, with values up to 0.31" (8mm).
Weather in January
January in Bellevue, Washington represents the outset of the year with its cold, damp winter/climate. The frosty days, evenings and nights are coupled with mostly cloudy skies, contributing to the overall chilly atmosphere. This month brings with it a small but notable amount of snowfall, 0.67" (17mm) perhaps adding a snowy blanket or two to Bellevue. Weather in January »Weather in February
February does not represent a significant shift in weather patterns from January in Bellevue, Washington. Resembling its predecessor, this month still experiences regular precipitation advising to carry umbrellas and rain-gear frequently. Weather in February »Weather in March
As the city of Bellevue transitions from winter to Spring, March witnesses a gradual increase in temperature, paving the path for warmer days ahead. This month experiences a decline in snowfall, slowly retiring from the winter cold. Weather in March »Weather in April
April introduces the breath of Spring to Bellevue, Washington, shedding the remnants of winter while warming up to the advent of summer. Days are becoming brighter and longer, with noticeable increments in the hours of sunlight, promising enjoyable afternoons. Weather in April »Weather in May
The month of May in Bellevue, Washington marks the complete farewell to winter chill and a warm welcome to the sunny days of summer. There is pleasant dryness in the weather as this month records the lowest rainfall, 0.79" (20mm) amongst all Spring months. Weather in May »Weather in June
June bids adieu to Spring and enthusiastically steps into the heart of Summer in Bellevue, Washington. The town immerses itself in the warm temperatures accompanied by an abundance of sunshine and longer daylight hours. Many beaches open to the public, taking advantage of the season's welcoming weather. Weather in June »Weather in July
Summer peaks in July in Bellevue, Washington, with temperatures scaling up to the highest average, manifesting in 76.1°F (24.5°C). The low precipitation, the maximum sunshine hours, and optimum UV index make it perfect for outdoor activities. Weather in July »Weather in August
Resembling July, August continues to blaze the summer trail in Bellevue, Washington. Though the humidity tends to go up from July, Bellevue still enjoys the warmth of the sun with the least cloud cover. The city draws families to enjoy picnics in parks and water activities at local beaches. Weather in August »Weather in September
September in Bellevue, Washington signals the arrival of Fall with a noticeable drop in temperatures. It accompanies the slight resurgence in precipitation, 0.63" (16mm), nurturing the transformation of green landscapes into shades of gold and orange. Weather in September »Weather in October
October introduces the crisp air of Fall in Bellevue, Washington, with a significant drop in temperatures from September. As autumn sweeps across the town, the changing foliage offers mesmerizing views of reds, oranges, yellows, and browns. Weather in October »Weather in November
With temperatures steadily dipping, November drives Bellevue, Washington, closer to winter. The golden leaves of autumn start to gather on the sidewalks, adding to the charm of the city's landscape. While sunshine hours decrease significantly, the rainfall elevates to 1.3" (33mm). Weather in November »Weather in December
December in Bellevue, Washington, is ushered in with cold winds and low temperatures. The city transforms into a winter wonderland with the highest amount of rainfall, 2.01" (51mm), received all year. While snowfall is infrequent, festive decorations and holiday cheers brighten up the cold, gloomy days. Weather in December »Updated: Feb 14, 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 is the most humid month in Bellevue, with an average relative humidity of 85%.
Throughout the year, in Bellevue, Washington, there are 119.1 rainfall days, and 11.97" (304mm) of precipitation is accumulated.
January through March, November and December are months with snowfall in Bellevue, Washington.
In Bellevue, Washington, during the entire year, snow falls for 7 days and aggregates up to 3.27" (83mm) of snow.
The months with the lowest UV index in Bellevue are January, February, November and December, with an average maximum UV index of 2.
February is the month with the most snowfall. Snow falls for 3 days and accumulates 1.77" (45mm) 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 Bellevue, snow does not fall in April through October.
June has the longest days of the year, with an average of 15h and 54min of daylight.
The least humid month in Bellevue, Washington, is July, with an average relative humidity of 69%.
July is the month with the least rainfall. Rain falls for 5.5 days and accumulates 0.24" (6mm) of precipitation.
With an average maximum UV index of 6, July is the month with the highest UV index.
With average high and low temperatures of 76.6°F (24.8°C) and 53.4°F (11.9°C) respectively, August is Bellevue's warmest month.
The month with the most sunshine in Bellevue, Washington, is August, with an average of 10.7h of sunshine.
Temperature readings in Bellevue, Washington, reach their annual highs in December, averaging 42.8°F (6°C) and a minimum average of 34.7°F (1.5°C).
December is the month with the most rainfall in Bellevue. Rain falls for 12.5 days and accumulates 2.01" (51mm) of precipitation.
With an average of 8h and 30min of daylight, December has the shortest days of the year.
The month with the least sunshine in Bellevue is December, with an average of 4.2h of sunshine.
Average temperature
Bellevue, WA
The warmest month (with the highest average high temperature) is August (76.6°F).
The month with the lowest average high temperature is December (42.8°F).
The month with the highest average low temperature is August (53.4°F).
The coldest month (with the lowest average low temperature) is February (34.5°F).
Average pressure
Bellevue, 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:
30.02"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
Bellevue, WA
- Average wind speed in January:
5mph - Average wind speed in February:
4.8mph - Average wind speed in March:
5.1mph - Average wind speed in April:
4.5mph - Average wind speed in May:
3.9mph - Average wind speed in June:
3.7mph
- 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:
4.2mph - Average wind speed in November:
4.9mph - Average wind speed in December:
4.7mph
The windiest month (with the highest average wind speed) is March (5.1mph).
The calmest month (with the lowest average wind speed) is August (3.4mph).
Average humidity
Bellevue, WA
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is July (69%).
Average rainfall
Bellevue, WA
- Average rainfall in January:
1.54" - Average rainfall in February:
1.34" - Average rainfall in March:
1.02" - Average rainfall in April:
1.06" - Average rainfall in May:
0.79" - Average rainfall in June:
0.63"
The wettest month (with the highest rainfall) is December (2.01").
The driest month (with the least rainfall) is July (0.24").
Average rainfall days
Bellevue, WA
- Average rainfall days in January:
11.8 days - Average rainfall days in February:
11.3 days - Average rainfall days in March:
13.7 days - Average rainfall days in April:
12.3 days - Average rainfall days in May:
10.1 days - Average rainfall days in June:
8.9 days
- Average rainfall days in July:
5.5 days - Average rainfall days in August:
4.1 days - Average rainfall days in September:
7.5 days - Average rainfall days in October:
10.5 days - Average rainfall days in November:
10.9 days - Average rainfall days in December:
12.5 days
The month with the highest number of rainy days is March (13.7 days).
The month with the least rainy days is August (4.1 days).
Average snowfall
Bellevue, WA
The month with the highest snowfall is February (1.77").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days
Bellevue, WA
- Average snowfall days in January:
1.3 days - Average snowfall days in February:
3 days - Average snowfall days in March:
1 days - Average snowfall days in April:
0.1 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:
0.5 days - Average snowfall days in December:
1.1 days
The month with the highest number of snowfall days is February (3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Bellevue, 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 24min - Average sunshine in February:
4h and 30min - Average sunshine in March:
6h and 18min - Average sunshine in April:
8h and 6min - Average sunshine in May:
9h and 12min - Average sunshine in June:
9h and 24min
- Average sunshine in July:
10h and 36min - Average sunshine in August:
10h and 42min - Average sunshine in September:
9h and 18min - Average sunshine in October:
5h and 30min - Average sunshine in November:
4h and 36min - Average sunshine in December:
4h and 12min
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 12min).
Average sunshine days
Bellevue, WA
- Average sunshine days in January:
17.1 days - Average sunshine days in February:
13.8 days - Average sunshine days in March:
15.8 days - Average sunshine days in April:
14.8 days - Average sunshine days in May:
18.5 days - Average sunshine days in June:
18.8 days
- Average sunshine days in July:
24.1 days - Average sunshine days in August:
24.9 days - Average sunshine days in September:
20.5 days - Average sunshine days in October:
18.6 days - Average sunshine days in November:
16.6 days - Average sunshine days in December:
17.4 days
The month with the most sunshine days is August (24.9 days).
The month with the least sunshine days is February (13.8 days).
Average UV index
Bellevue, WA
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover
Bellevue, WA
The month with the most cloud cover is December (Cloud cover 56).
The month with the least cloud cover is August (Cloud cover 25).
Average visibility
Bellevue, 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).
