Sammamish, Washington Weather
Rufous Hummingbirds Arrive. Day 77 of spring. Read this microseason across nine climate regions →
Sammamish weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Overcast14%—64°52°—
- FridayJun 5Rain40%0.15″58°48°-6°
- SaturdayJun 6Heavy Drizzle82%0.12″52°44°-6°
- SundayJun 7Light Drizzle—0.02″65°45°+13°
- MondayJun 8Overcast57%—58°46°-7°
- TuesdayJun 9Overcast57%—60°46°+2°
- WednesdayJun 10Overcast36%—61°45°+1°
Ozone at AQI 34 now. AQI down 11 over the last 6 hours (steady decline since this morning). With UV 4.2 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 14 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 34 now. With UV 4.2 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 14 by mid-afternoon.
- Present
- AQI 34
- UV peak
- 4.2 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 14
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
- 7:08 AM
- Moonset
- 3:49 PM
- In sign
- ♒︎ Aquarius
Rufous Hummingbirds Arrive
Sammamish at a glance
- Today vs. normal: 12°F below the seasonal normal for this latitude
- Last frost: June 1 (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 — Sammamish
SPC has placed Sammamish 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.