Mossyrock, Washington Weather
Rufous Hummingbirds Arrive. Day 78 of spring. Read this microseason across nine climate regions →
Mossyrock weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 5Light Rain41%0.11″55°47°—
- SaturdayJun 6Rain100%0.33″55°47°0°
- SundayJun 7Light Drizzle—0.01″63°42°+8°
- MondayJun 8Light Showers66%0.43″55°46°-8°
- TuesdayJun 9Showers65%0.13″58°45°+3°
- WednesdayJun 10Overcast46%—63°45°+5°
- ThursdayJun 11Clear13%—77°43°+14°
AQI 31 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±4 points). PM2.5 at 6.4 µg/m³ (AQI 36) with a 0.67 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
PM × Wind × Precip
PM2.5 at 6.4 µg/m³ (AQI 36) with a 0.67 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.67
- Wind
- calm
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
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).
The higher the clouds, the finer the weather.
- Moonrise
- 7:32 AM
- Moonset
- 5:06 PM
- In sign
- ♒︎ Aquarius
Rufous Hummingbirds Arrive
Mossyrock at a glance
- Today vs. normal: 19°F below the seasonal normal for this latitude
- Last frost: May 25 (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 5, 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 — Mossyrock
SPC has placed Mossyrock in the General Thunderstorms category for severe thunderstorms tomorrow.
- TODAYNONENo severe risk
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3NONENo severe risk
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
Mossyrock's warmest month is August (~66°F mean) and its coldest is December (~39°F). Rainfall peaks in November (8.4 inches) and bottoms out in July (0.9 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 39° | 8.1″ | 15 |
| February | 41° | 5.8″ | 12 |
| March | 45° | 6.3″ | 14 |
| April | 49° | 5.5″ | 13 |
| May | 56° | 3.8″ | 10 |
| June | 60° | 2.7″ | 7 |
| July | 66° | 0.9″ | 3 |
| August | 66° | 1.3″ | 3 |
| September | 61° | 2.5″ | 6 |
| October | 52° | 5.4″ | 11 |
| November | 44° | 8.4″ | 14 |
| December | 39° | 8.1″ | 15 |
Regional context
Mossyrock's climate, per the NOAA NCEI 1991-2020 normals from the nearest reporting station, runs cold-winter and warm-summer. January means hover near 39°F while July climbs to 66°F — a 27°F seasonal swing typical of northern-tier latitudes. Annual precipitation totals about 58.7 inches spread across roughly 121 days with measurable rain or snow.
Precipitation peaks in the cool season: November averages 8.4 inches across 14.3 days with measurable rain, mostly from frontal systems and winter storms, while July bottoms out at 0.9 inches across just 2.6 rainy days during the drier warm-season stretch. The pattern groups Mossyrock with places like Morton, WA, Onalaska, WA and Toledo, WA, places whose summer-dry rhythm and cool-season-wet recharge run on the same regional storm-track exposure.
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. Warm-soil crops — tomatoes, peppers, eggplant — wait until soil temperatures reach the mid-50s°F, usually two weeks past the last-frost date. 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 Mossyrock 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: Morton, WA, Onalaska, WA, Toledo, WA, Mineral, WA, Napavine, WA.
Frequently asked
- When does it freeze in Mossyrock?
- Mossyrock's last spring frost typically falls around mid-May, and the first fall frost arrives around mid-October.
- What is the rainy season in Mossyrock?
- November is the wettest month with about 8.4 inches of rain on average; the city receives roughly 59 inches annually.
- What is the warmest month in Mossyrock?
- August is typically warmest, averaging about 66°F.
- What is the coldest month in Mossyrock?
- December is typically coldest, averaging about 39°F.
- When can I start a vegetable garden in Mossyrock?
- 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 Mossyrock get?
- Mossyrock averages about 121 rainy days per year.
- What hardiness zone is Mossyrock?
- Mossyrock'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
Mossyrock, Washington sits in a warm-summer Mediterranean climate zone. January means hover near 39°F while July averages 66°F — a 27°F seasonal swing.
Across the year, Mossyrock receives about 59 inches of precipitation spread over roughly 121 rainy days.
The rhythm of the year is set by latitude (46.5°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.