Pasco, Washington Weather
Pikas hayfeeding in granite peaks. Day 76 of spring. Read this microseason across nine climate regions →
Pasco weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Overcast20%—83°52°—
- ThursdayJun 4Overcast——80°59°-3°
- FridayJun 5Overcast——78°53°-2°
- SaturdayJun 6Overcast——73°53°-5°
- SundayJun 7Overcast——75°48°+2°
- MondayJun 8Overcast14%—67°56°-8°
- TuesdayJun 9Overcast17%—75°49°+8°
Ozone at AQI 48. AQI up 6 over the last 6 hours (gradual rise). Overcast through the UV peak window (cloud cover ~61%) — afternoon ozone should stay flat.
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 48. Overcast through the UV peak window (cloud cover ~61%) — afternoon ozone should stay flat.
- Present
- AQI 48
- UV peak
- 5.5 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 18
PM × Wind × Precip
PM2.5 at 4.6 µg/m³ (AQI 26) with a 0.73 fine-to-coarse ratio and 6 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.73
- Wind
- light
- 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
- 6:18 AM
- Moonset
- 2:34 PM
- In sign
- ♑︎ Capricorn
Pikas hayfeeding in granite peaks
Pasco at a glance
- Today vs. normal: 12°F above the seasonal normal for this latitude
- Last frost: May 24 (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 3, 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.
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
Pasco's warmest month is July (~77°F mean) and its coldest is January (~36°F). Rainfall peaks in January (1.1 inches) and bottoms out in August (0.2 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 36° | 1.1″ | 4 |
| February | 40° | 0.8″ | 3 |
| March | 47° | 0.7″ | 2 |
| April | 54° | 0.6″ | 2 |
| May | 63° | 0.8″ | 2 |
| June | 69° | 0.6″ | 2 |
| July | 77° | 0.2″ | 1 |
| August | 76° | 0.2″ | 1 |
| September | 67° | 0.3″ | 1 |
| October | 55° | 0.7″ | 2 |
| November | 43° | 0.9″ | 3 |
| December | 36° | 1.1″ | 4 |
Regional context
Pasco sits within a warm-summer Mediterranean climate region — a cohort that shares similar temperature ranges, seasonal patterns, and growing conditions across nearby cities.
Similar climates: Seattle, WA, Spokane, WA, Kennewick, WA, Bremerton, WA, Tacoma, WA.
Frequently asked
- When does it freeze in Pasco?
- Pasco's last spring frost typically falls around mid-May, and the first fall frost arrives around mid-October.
- What is the rainy season in Pasco?
- January is the wettest month with about 1.1 inches of rain on average; the city receives roughly 8 inches annually.
- What is the warmest month in Pasco?
- July is typically warmest, averaging about 77°F.
- What is the coldest month in Pasco?
- January is typically coldest, averaging about 36°F.
- When can I start a vegetable garden in Pasco?
- 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 Pasco get?
- Pasco averages about 27 rainy days per year.
- What hardiness zone is Pasco?
- Pasco'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
Pasco, Washington sits in a warm-summer Mediterranean climate zone. January means hover near 36°F while July averages 77°F — a 41°F seasonal swing.
Across the year, Pasco receives about 8 inches of precipitation spread over roughly 27 rainy days.
The rhythm of the year is set by latitude (46.3°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.