Heat Advisory — San Juan County, WA, Foothills and Valleys of the North Cascades, WA, Foothills and Valleys of Thurston and Lewis Counties, WA, Lowlands of Western Whatcom County, WA, Lowlands of Western Skagit and Northwestern Snohomish Counties, WA, Olympia and Southern Puget Sound, WA, Lowlands of Lewis and Southern Thurston Counties, WA, Middle Chehalis River Valley, WA, Willapa and Black Hills, WA, Southern Hood Canal, WA, Northern Hood Canal, WA, Port Townsend Area, WA, Eastern Strait of Juan de Fuca, WA, Foothills of the Western and Southern Olympic Peninsula, WA, Lower Chehalis River Valley, WA, Island County, WA, Foothills and Valleys of Snohomish and Northern King Counties, WA, Foothills and Valleys of Central King County, WA, Foothills and Valleys of Pierce and Southern King Counties, WA, Downtown Everett / Marysville Area, WA, Shoreline / Lynnwood / South Everett Area, WA, Eastside, WA, City of Seattle, WA, Lowlands of Pierce and Southern King Counties, WA, Eastern Kitsap County, WA 1:00 AM

San Juan County, Washington, United States

Last updated: 5:02 PM CDT  ·  Refresh
23°C
Feels like 22°
Partly Cloudy
▲ 28°  /  ▼ 14°
Wind
6 mph NNW
Humidity
53%
Dew Point
11°
Pressure
30.00 inHg
Visibility
10 mi
UV Index
8.1
Cloud Cover
48%
Sunrise
5:10 AM
Sunset
9:18 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: San Juan County is currently partly cloudy at 23°C. Dry conditions are expected through the next 24 hours. Sunrise: 5:10AM · Sunset: 9:18PM.

Alerts

Heat Advisory
San Juan County, WA, Foothills and Valleys of the North Cascades, WA, Foothills and Valleys of Thurston and Lewis Counties, WA, Lowlands of Western Whatcom County, WA, Lowlands of Western Skagit and Northwestern Snohomish Counties, WA, Olympia and Southern Puget Sound, WA, Lowlands of Lewis and Southern Thurston Counties, WA, Middle Chehalis River Valley, WA, Willapa and Black Hills, WA, Southern Hood Canal, WA, Northern Hood Canal, WA, Port Townsend Area, WA, Eastern Strait of Juan de Fuca, WA, Foothills of the Western and Southern Olympic Peninsula, WA, Lower Chehalis River Valley, WA, Island County, WA, Foothills and Valleys of Snohomish and Northern King Counties, WA, Foothills and Valleys of Central King County, WA, Foothills and Valleys of Pierce and Southern King Counties, WA, Downtown Everett / Marysville Area, WA, Shoreline / Lynnwood / South Everett Area, WA, Eastside, WA, City of Seattle, WA, Lowlands of Pierce and Southern King Counties, WA, Eastern Kitsap County, WA
Expires 1:00 AM
27 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
23°
3%
4 PM
28°
23%
5 PM
28°
23%
6 PM
28°
23%
7 PM
27°
23%
8 PM
26°
23%
9 PM
24°
23%
10 PM
18°
16%
11 PM
18°
3%
12 AM
17°
3%
1 AM
17°
3%
2 AM
15°
3%
3 AM
15°
3%
4 AM
14°
3%
5 AM
14°
3%
6 AM
16°
3%
7 AM
17°
3%
8 AM
17°
3%
9 AM
18°
3%
10 AM
22°
3%
11 AM
22°
3%
12 PM
22°
3%
1 PM
22°
3%
2 PM
24°
3%
7-Day Forecast
Today
28° 14°
Rain, 23% chance.
Wed
24° 14°
Partly Cloudy.
Thu
21° 12°
Rain, 65% chance.
Fri
19° 13°
Rain, 90% chance.
Sat
19° 11°
Clear with a 45% chance of rain.
Sun
21° 12°
Clear.
Mon
19° 13°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 23° Partly Cloudy 3% 6 mph NNW 53%
4 PM 28° Mostly Cloudy 23% 5 mph NNW 47%
5 PM 28° Rain 23% 5 mph NNW 46%
6 PM 28° Rain 23% 5 mph NNW 50%
7 PM 27° Rain 23% 4 mph NW 55%
8 PM 26° Rain 23% 4 mph W 59%
9 PM 24° Rain 23% 3 mph WSW 63%
10 PM 18° Drizzle 16% 2 mph SW 65%
11 PM 18° Clear 3% 3 mph SSW 67%
12 AM 17° Clear 3% 2 mph WSW 68%
1 AM 17° Mostly Clear 3% 2 mph E 67%
2 AM 15° Partly Cloudy 3% 3 mph ENE 66%
3 AM 15° Mostly Cloudy 3% 2 mph SSW 69%
4 AM 14° Overcast 3% 2 mph SSW 73%
5 AM 14° Overcast 3% 2 mph SSW 76%
6 AM 16° Overcast 3% 2 mph SSW 75%
7 AM 17° Overcast 3% 3 mph SSW 74%
8 AM 17° Overcast 3% 3 mph SSW 70%
9 AM 18° Mostly Cloudy 3% 3 mph SSW 68%
10 AM 22° Partly Cloudy 3% 3 mph SSW 66%
11 AM 22° Partly Cloudy 3% 3 mph SSW 64%
12 PM 22° Partly Cloudy 3% 3 mph SSW 63%
1 PM 22° Partly Cloudy 3% 4 mph SSW 63%
2 PM 24° Partly Cloudy 3% 5 mph SSW 63%
15-Day Forecast
Today
6/23
Rain
23%
14°
28°
Wed
6/24
Partly Cloudy
3%
14°
24°
Thu
6/25
Rain
65%
12°
21°
Fri
6/26
Rain
90%
13°
19°
Sat
6/27
Clear
45%
11°
19°
Sun
6/28
Clear
15%
12°
21°
Mon
6/29
Clear
14%
13°
19°
Tue
6/30
Clear
38%
13°
19°
Wed
7/1
Drizzle
47%
12°
18°
Thu
7/2
Clear
47%
12°
18°
Fri
7/3
Clear
32%
12°
19°
Sat
7/4
Clear
22%
12°
20°
Sun
7/5
Clear
38%
12°
21°
Mon
7/6
Clear
20%
12°
21°
Tue
7/7
Clear
20%
12°
21°
27
Good
U.S. Air Quality Index · Dominant: O3
50 100 150 200

Air quality is satisfactory and poses little or no health risk.

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
21 AQI 3.8 µg/m³
O3
Ground-level ozone
Dominant
27 AQI 30 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Wed 27 Good 27 21
Thu 26 Good 24 26
Fri 24 Good 24 24
About the Air Quality Index
0–50 Good
51–100 Moderate
101–150 Unhealthy for Sensitive Groups
151–200 Unhealthy
201–300 Very Unhealthy
301–500 Hazardous

The U.S. AQI runs 0–500. The overall value equals the highest individual pollutant sub-index, and the dominant pollutant is the one driving it. PM2.5 (fine particles) is reported in µg/m³ and ozone (O3) in ppb. Forecast source: NWS NAQFC.

1000850700500400300250200150100 -40-30-20-10010203040 0.41247101624 LCL0°C Temperature (°C) Pressure (hPa)
Temp Dewpoint Parcel (SB) CAPE CIN Dry adiabat Moist adiabat Mixing ratio
RAP
Valid Tue Jun 23, 20:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE0 J/kg
MLCAPE21 J/kg
MUCAPE8 J/kg
SBCIN-9493 J/kg
MLCIN0 J/kg
Lifted Index2.0
Kinematics
0–6 km Shear10 kt
0–1 km Shear11 kt
Eff. Shear—
0–1 km SRH3
0–3 km SRH-10
Eff. SRH—
Storm Motion131° @ 17 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)—
Supercell—
K-Index29.7
Thermo & Levels
PWAT0.88 in
0–3 km LR6.4 °C/km
700–500 LR6.5 °C/km
Total Totals48.3
LCL855 hPa
LFC—
EL—
Freezing Lvl11,099 ft