Inchelium, Washington Weather
Pikas hayfeeding in granite peaks. Day 78 of spring. Read this microseason across nine climate regions →
Inchelium weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Overcast——71°53°—
- FridayJun 5Overcast——67°52°-4°
- SaturdayJun 6Light Drizzle31%0.02″59°39°-8°
- SundayJun 7Overcast12%—63°34°+4°
- MondayJun 8Overcast26%—71°36°+8°
- TuesdayJun 9Overcast41%—73°50°+2°
- WednesdayJun 10Partly Cloudy49%—76°45°+3°
AQI 45 (Good), driven by Ozone. AQI flat over the last 6 hours (within ±3 points). Ozone at AQI 43 now. With UV 0.3 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 10 by mid-afternoon.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 43 now. With UV 0.3 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 10 by mid-afternoon.
- Present
- AQI 43
- UV peak
- 0.3 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 10
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
- 7:21 AM
- Moonset
- 4:42 PM
- In sign
- ♒︎ Aquarius
Pikas hayfeeding in granite peaks
Inchelium at a glance
- Today vs. normal: 69°F — typical for the season
- Last frost: June 5 (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
Warm-season window is open
As of June 5, the last spring frost has passed for most years. Transplant tomatoes, peppers, eggplants, basil, and cucurbits (cucumbers, squash, melons) now. Direct-sow beans and corn into warm soil.
SPC Convective Outlook
Storm Prediction Center — Inchelium
SPC has placed Inchelium in the General Thunderstorms category for severe thunderstorms day after tomorrow.
- TODAYNONENo severe risk
- TOMORROWNONENo severe risk
- 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
Inchelium's warmest month is July (~71°F mean) and its coldest is December (~29°F). Rainfall peaks in December (2.8 inches) and bottoms out in August (0.7 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 29° | 2.2″ | 7 |
| February | 33° | 1.5″ | 5 |
| March | 41° | 1.9″ | 6 |
| April | 49° | 1.5″ | 5 |
| May | 58° | 1.9″ | 6 |
| June | 63° | 2.1″ | 5 |
| July | 71° | 0.8″ | 3 |
| August | 70° | 0.7″ | 2 |
| September | 61° | 0.7″ | 3 |
| October | 48° | 1.5″ | 4 |
| November | 36° | 2.2″ | 7 |
| December | 29° | 2.8″ | 8 |
Regional context
Inchelium's climate, per the NOAA NCEI 1991-2020 normals from the nearest reporting station, runs cold-winter and warm-summer. January means hover near 29°F while July climbs to 71°F — a 42°F seasonal swing typical of northern-tier latitudes. Annual precipitation totals about 19.9 inches spread across roughly 61 days with measurable rain or snow.
Precipitation peaks in the cool season: December averages 2.8 inches across 7.5 days with measurable rain, mostly from frontal systems and winter storms, while August bottoms out at 0.7 inches across just 1.7 rainy days during the drier warm-season stretch. The cool-season-wet pattern aligns Inchelium with places like Twin Lakes, WA, Addy, WA and Kettle Falls, WA — places where Pacific or frontal storm tracks deliver the year's moisture between November and March.
The frost-sensitive growing window opens around late-May, when overnight lows reliably clear freezing for cool-season crops like kale, peas, spinach, and parsnips. Warm-season transplants — tomatoes, peppers, and basil — typically wait two weeks past that date to avoid late spring cold snaps. 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 Inchelium 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: Twin Lakes, WA, Addy, WA, Kettle Falls, WA, Colville, WA, Chewelah, WA.
Frequently asked
- When does it freeze in Inchelium?
- Inchelium's last spring frost typically falls around mid-May, and the first fall frost arrives around mid-October.
- What is the rainy season in Inchelium?
- December is the wettest month with about 2.8 inches of rain on average; the city receives roughly 20 inches annually.
- What is the warmest month in Inchelium?
- July is typically warmest, averaging about 71°F.
- What is the coldest month in Inchelium?
- December is typically coldest, averaging about 29°F.
- When can I start a vegetable garden in Inchelium?
- 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 Inchelium get?
- Inchelium averages about 61 rainy days per year.
- What hardiness zone is Inchelium?
- Inchelium'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
Inchelium, Washington sits in a warm-summer Mediterranean climate zone. January means hover near 29°F while July averages 71°F — a 42°F seasonal swing.
Across the year, Inchelium receives about 20 inches of precipitation spread over roughly 61 rainy days.
The rhythm of the year is set by latitude (48.3°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.