John Sam Lake, WA Weather Forecast
Local 7-day forecast
Patchy Fog then Mostly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for John Sam Lake, WA in one place.
Patchy fog before 7am. Mostly sunny, with a high near 75. Northwest wind 1 to 8 mph.
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: Jul 17, 2026 8:07 PM PDT.
The active forecast window currently covers Jul 18 to Jul 24, 2026 for John Sam Lake, WA.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 18 to Jul 24, 2026
- Latest sync
- Jul 17, 2026 8:07 PM 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 81 degrees F.
Saturday Night is the coolest period ahead with temperatures near 53 degrees F.
The strongest winds are forecast for Saturday at about 1 to 8 mph NW.
The forecast from Jul 18 through Jul 24 stays mostly dry.
Forecast Details
- Last updated
- Jul 17, 2026 8:07 PM PDT
- Coverage
- 7 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
Partly cloudy, with a low around 53. Northwest wind 2 to 8 mph.
Mostly sunny, with a high near 78. Northwest wind 2 to 8 mph.
Mostly clear, with a low around 54. Northwest wind 2 to 8 mph.
Mostly sunny, with a high near 81.
Partly cloudy, with a low around 60.
Mostly sunny, with a high near 81.
Partly cloudy, with a low around 61.
Mostly sunny, with a high near 81.
Partly cloudy, with a low around 60.
Sunny, with a high near 79.
Mostly clear, with a low around 59.
Sunny, with a high near 77.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Saturday
Jul 18
|
Patchy Fog then Mostly Sunny
|
75°F |
1 to 8 mph
NW
|
|
Saturday Night
Jul 18
|
Partly Cloudy
|
53°F |
2 to 8 mph
NW
|
|
Sunday
Jul 19
|
Mostly Sunny
|
78°F |
2 to 8 mph
NW
|
|
Sunday Night
Jul 19
|
Mostly Clear
|
54°F |
2 to 8 mph
NW
|
|
Monday
Jul 20
|
Mostly Sunny
|
81°F |
2 to 7 mph
NW
|
|
Monday Night
Jul 20
|
Partly Cloudy
|
60°F |
1 to 6 mph
NNW
|
|
Tuesday
Jul 21
|
Mostly Sunny
|
81°F |
0 to 6 mph
NNW
|
|
Tuesday Night
Jul 21
|
Partly Cloudy
|
61°F |
1 to 6 mph
N
|
|
Wednesday
Jul 22
|
Mostly Sunny
|
81°F |
1 to 6 mph
WNW
|
|
Wednesday Night
Jul 22
|
Partly Cloudy
|
60°F |
2 to 6 mph
NW
|
|
Thursday
Jul 23
|
Sunny
|
79°F |
2 to 6 mph
SW
|
|
Thursday Night
Jul 23
|
Mostly Clear
|
59°F |
2 to 6 mph
NNW
|
|
Friday
Jul 24
|
Sunny
|
77°F |
2 to 6 mph
SW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around John Sam Lake.