John Sam Lake, WA Weather Forecast
Local 7-day forecast
Mostly Cloudy
Track current conditions, temperature changes, wind, and the full daily outlook for John Sam Lake, WA in one place.
Mostly cloudy, with a high near 66.
Local Weather Overview
This forecast page for John Sam Lake, WA is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Apr 17, 2026 12:19 AM PDT.
The active forecast window currently covers Apr 19 to Apr 23, 2026 for John Sam Lake, WA.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Apr 19 to Apr 23, 2026
- Latest sync
- Apr 17, 2026 12:19 AM PDT
- Forecast office
- SEW
- Source
- NOAA / NWS
Daily Outlook
This Week in John Sam Lake
Monday looks like the warmest upcoming period in John Sam Lake at 67 degrees F.
Wednesday Night is the coolest period ahead with temperatures near 45 degrees F.
The strongest winds are forecast for Sunday at about 3 to 7 mph N.
Precipitation is mentioned in 4 upcoming forecast periods.
Forecast Details
- Last updated
- Apr 17, 2026 12:19 AM PDT
- Coverage
- 5 days
- Time zone
- America/Los_Angeles
- Forecast office
- SEW
- Radar station
- KATX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Mostly cloudy, with a low around 47.
Mostly sunny, with a high near 67.
A chance of rain after 5am. Partly cloudy, with a low around 49.
A chance of rain. Partly sunny, with a high near 62.
A chance of rain. Mostly cloudy, with a low around 48.
A chance of rain before 5pm. Mostly cloudy, with a high near 59.
Mostly cloudy, with a low around 45.
Partly sunny, with a high near 58.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Sunday
Apr 19
|
Mostly Cloudy
|
66°F |
3 to 7 mph
N
|
|
Sunday Night
Apr 19
|
Mostly Cloudy
|
47°F |
3 to 7 mph
NW
|
|
Monday
Apr 20
|
Mostly Sunny
|
67°F |
3 to 7 mph
NW
|
|
Monday Night
Apr 20
|
Partly Cloudy then Chance Light Rain
|
49°F |
6 mph
SSW
|
|
Tuesday
Apr 21
|
Chance Light Rain
|
62°F |
7 mph
SW
|
|
Tuesday Night
Apr 21
|
Chance Light Rain
|
48°F |
7 mph
W
|
|
Wednesday
Apr 22
|
Chance Light Rain
|
59°F |
7 mph
SSW
|
|
Wednesday Night
Apr 22
|
Mostly Cloudy
|
45°F |
6 mph
W
|
|
Thursday
Apr 23
|
Partly Sunny
|
58°F |
3 to 7 mph
W
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around John Sam Lake.