Weather in Bellevue, Washington
Shoots and Sprouts Rise in Ranks. Day 59 of spring. Read this microseason across nine climate regions →
- TodayMay 16Overcast31%54°44°
- SundayMay 17Overcast17%62°40°
- MondayMay 18Overcast—65°46°
- TuesdayMay 19Light Drizzle—62°47°
- WednesdayMay 20Overcast—69°43°
- ThursdayMay 21Partly Cloudy—77°44°
- FridayMay 22Overcast—73°48°
- PM 2.5
- 2.9 μg/m³
- PM 10
- 3.4 μg/m³
- NO₂
- 3.2 μg/m³
- Ozone
- 82.0 μg/m³
- UV Index
- 1.6 Low
When the dew is on the grass, rain will never come to pass.
- Moonrise
- 12:28 PM
- Moonset
- 4:28 AM
- In sign
- ♉︎ Taurus
Shoots and Sprouts Rise in Ranks
Bellevue at a glance
- Today vs. normal: 10°F below the seasonal normal for this latitude
- Last frost: June 1 (climatological average for this latitude)
- Microseason: 28 of 72, May 16–20
- Planting window: Direct sow okra, melons, and southern peas. Thin carrot rows.
Right now in the garden
Cool-season window is open
As of May 17, the cool-season window is open or about to open. Direct-sow peas, lettuce, spinach, radishes, and brassicas now. Hold off on warm-season crops until 1–2 weeks after the last spring frost (around May).
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| January | — | — |
| February | — | — |
| March | — | — |
| April | — | — |
| May | lettuce, peas, spinach, radishes | lettuce, peas, radishes |
| June | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| July | tomatoes, peppers, beans, squash | tomatoes, beans, summer squash |
| August | tomatoes, peppers, beans, squash, fall brassicas, garlic (overwinter), carrots | tomatoes, beans, summer squash |
| September | fall brassicas, garlic (overwinter), carrots | tomatoes, beans, summer squash |
| October | — | winter squash, tomatoes (last) |
| November | — | — |
| December | — | — |
A year in weather
August brings Bellevue's peak warmth at roughly 67°F average, while December delivers the coldest temperatures around 42°F. Rain reaches its maximum in November with 5.8 inches, then drops to just 0.8 inches during July.
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 42° | 5.1″ | 12 |
| February | 43° | 3.5″ | 9 |
| March | 47° | 3.9″ | 11 |
| April | 51° | 3.0″ | 9 |
| May | 57° | 2.2″ | 6 |
| June | 61° | 1.6″ | 5 |
| July | 67° | 0.8″ | 2 |
| August | 67° | 1.0″ | 3 |
| September | 62° | 1.7″ | 5 |
| October | 54° | 3.6″ | 9 |
| November | 46° | 5.8″ | 12 |
| December | 42° | 5.5″ | 12 |
Regional context
Bellevue falls within a warm-summer Mediterranean climate region, sharing temperature ranges, seasonal rhythms, and growing conditions with other nearby cities in this climate group.
Similar climates: Seattle, WA, Spokane, WA, Kennewick, WA, Bremerton, WA, Tacoma, WA.
Naturalist notes
Pacific rhododendrons reach peak bloom across Bellevue's parks and gardens during late May, their pink and purple clusters marking the transition from spring to early summer.
American robins begin their evening chorus around 5:30 AM in late May, with males establishing territories before the main nesting season intensifies.
Frequently asked
- When does it freeze in Bellevue?
- Spring's final frost in Bellevue usually occurs around mid-May, while the first fall frost returns around mid-October.
- What is the rainy season in Bellevue?
- November stands as the wettest month, delivering about 5.8 inches of rain on average, while the city's total annual rainfall reaches roughly 38 inches.
- What is the warmest month in Bellevue?
- August typically records the highest temperatures, averaging about 67°F.
- What is the coldest month in Bellevue?
- December usually brings the coldest weather, averaging about 42°F.
- When can I start a vegetable garden in Bellevue?
- Cool-season crops like peas and lettuce can be planted around the last spring frost in mid-May, but warm-season varieties such as tomatoes and peppers should wait 1–2 weeks after.
- How many rainy days does Bellevue get?
- Bellevue experiences about 95 rainy days per year on average.
- What hardiness zone is Bellevue?
- Bellevue's USDA hardiness zone depends on its lowest average winter temperature; the USDA's online lookup tool using the city ZIP code will provide the current zone designation.
Climate
Bellevue, Washington experiences a warm-summer Mediterranean climate. January temperatures hover near 42°F, while July averages 67°F — creating a 24°F seasonal swing.
Annual precipitation totals about 38 inches, falling across roughly 95 rainy days throughout the year.
Weather patterns here follow the city's latitude of 47.6°N, along with nearby water bodies and elevation. These factors determine what plants thrive, when frost occurs, and how daily weather unfolds.