Arlington, Washington Weather
Rufous Hummingbirds Arrive. Day 77 of spring. Read this microseason across nine climate regions →
Arlington weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Heavy Drizzle45%0.04″63°54°—
- FridayJun 5Light Drizzle74%0.02″60°47°-3°
- SaturdayJun 6Light Showers83%0.15″55°44°-5°
- SundayJun 7Light Drizzle——63°44°+8°
- MondayJun 8Heavy Drizzle56%0.20″64°48°+1°
- TuesdayJun 9Light Rain56%0.40″52°49°-12°
- WednesdayJun 10Overcast39%—63°47°+11°
AQI 25 (Good), driven by Ozone. AQI projected to ease from current levels toward 35 over the next 6 hours.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 11 AM.
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 7:11 AM
- Moonset
- 3:47 PM
- In sign
- ♑︎ Capricorn
Rufous Hummingbirds Arrive
Arlington at a glance
- Today vs. normal: 12°F below the seasonal normal for this latitude
- Last frost: June 4 (climatological average for this latitude)
- Microseason: Jun 1–5
- Planting window: Harvest spring lettuce before it bolts. Sow heat-tolerant greens.
Right now in the garden
Peak growing season
As of June 4, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
SPC Convective Outlook
Storm Prediction Center — Arlington
SPC has placed Arlington in the General Thunderstorms category for severe thunderstorms tomorrow.
- TODAYNONENo severe risk
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3TSTMGeneral Thunderstorms
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.
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
Arlington's warmest month is July (~63°F mean) and its coldest is December (~37°F). Rainfall peaks in November (7.2 inches) and bottoms out in July (1.1 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 38° | 5.9″ | 14 |
| February | 39° | 4.4″ | 12 |
| March | 43° | 5.0″ | 13 |
| April | 48° | 4.3″ | 11 |
| May | 54° | 3.4″ | 8 |
| June | 58° | 2.7″ | 7 |
| July | 63° | 1.1″ | 3 |
| August | 62° | 1.3″ | 3 |
| September | 57° | 2.5″ | 6 |
| October | 49° | 4.9″ | 11 |
| November | 42° | 7.2″ | 15 |
| December | 37° | 6.2″ | 14 |
Regional context
Arlington's climate, per the NOAA NCEI 1991-2020 normals from the nearest reporting station, runs cold-winter and warm-summer. January means hover near 38°F while July climbs to 63°F — a 25°F seasonal swing typical of northern-tier latitudes. Annual precipitation totals about 49 inches spread across roughly 119 days with measurable rain or snow.
Precipitation peaks in the cool season: November averages 7.2 inches across 15.2 days with measurable rain, mostly from frontal systems and winter storms, while July bottoms out at 1.1 inches across just 3.0 rainy days during the drier warm-season stretch. That winter-storm-driven distribution puts Arlington alongside places like Sisco Heights, WA, Arlington Heights, WA and Bryant, WA, all of which run drier through the summer months and rely on cool-season frontal activity for the year's precipitation.
The frost-sensitive growing window opens around late-May, when overnight lows reliably clear freezing for cool-season crops like peas, lettuce, spinach, and radishes. Heat-loving transplants like tomatoes, peppers, and squash generally hold off for another 10-14 days to clear the last spring frost risk window. The window closes around early-October, when overnight lows resume dipping below freezing and frost-tender plants need protection or harvest. These are 30-year central tendencies; year-to-year frost dates can move by up to two weeks. Local features matter: a south-facing slope inside Arlington typically runs 3-5 days ahead of the regional last-frost date, while a low-lying lot along a creek or drainage can lag the same date by a week or more on calm clear nights.
Similar climates: Sisco Heights, WA, Arlington Heights, WA, Bryant, WA, Silvana, WA, Marysville, WA.
Frequently asked
- When does it freeze in Arlington?
- Arlington's last spring frost typically falls around mid-May, and the first fall frost arrives around mid-October.
- What is the rainy season in Arlington?
- November is the wettest month with about 7.2 inches of rain on average; the city receives roughly 49 inches annually.
- What is the warmest month in Arlington?
- July is typically warmest, averaging about 63°F.
- What is the coldest month in Arlington?
- December is typically coldest, averaging about 37°F.
- When can I start a vegetable garden in Arlington?
- Cool-season crops (peas, lettuce) can be sown around the last spring frost (mid-May); warm-season crops (tomatoes, peppers) wait until 1–2 weeks after.
- How many rainy days does Arlington get?
- Arlington averages about 119 rainy days per year.
- What hardiness zone is Arlington?
- Arlington's USDA hardiness zone is determined by its lowest average winter temperature; check the USDA's online lookup with the city ZIP for the current zone designation.
Climate
Arlington, Washington sits in a warm-summer Mediterranean climate zone. January means hover near 38°F while July averages 63°F — a 25°F seasonal swing.
Across the year, Arlington receives about 49 inches of precipitation spread over roughly 119 rainy days.
The rhythm of the year is set by latitude (48.2°N), proximity to large water bodies, and elevation — all of which shape what grows here, when frost is likely, and what the weather story looks like day to day.