John Sam Lake, WA Weather Forecast
Local 7-day forecast
Mostly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for John Sam Lake, WA in one place.
Mostly sunny. High near 68, with temperatures falling to around 65 in the afternoon. North northwest wind 1 to 5 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: Oct 14, 2026 8:46 AM PDT.
The active forecast window currently covers Oct 15 to Oct 20, 2026 for John Sam Lake, WA.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Oct 15 to Oct 20, 2026
- Latest sync
- Oct 14, 2026 8:46 AM PDT
- Forecast office
- SEW
- Source
- NOAA / NWS
Daily Outlook
This Week in John Sam Lake
Friday looks like the warmest upcoming period in John Sam Lake at 73 degrees F.
Tuesday Night is the coolest period ahead with temperatures near 42 degrees F.
The strongest winds are forecast for Friday Night at about 2 to 9 mph SSE.
Precipitation is mentioned in 6 upcoming forecast periods.
Forecast Details
- Last updated
- Oct 14, 2026 8:46 AM 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
Mostly clear, with a low around 48. East northeast wind around 3 mph.
Mostly sunny, with a high near 73. Southeast wind around 3 mph.
Rain after 11pm. Mostly cloudy, with a low around 52. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible.
Rain before 5pm. Partly sunny, with a high near 60.
Partly cloudy, with a low around 43.
Partly sunny, with a high near 56.
A chance of rain after 11pm. Mostly cloudy, with a low around 45.
A chance of rain. Mostly cloudy, with a high near 55.
A chance of rain. Mostly cloudy, with a low around 44.
A slight chance of rain before 5pm. Partly sunny, with a high near 55.
Partly cloudy, with a low around 42.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Thursday
Oct 15
|
Mostly Sunny
|
68°F |
1 to 5 mph
NNW
|
|
Thursday Night
Oct 15
|
Mostly Clear
|
48°F |
3 mph
ENE
|
|
Friday
Oct 16
|
Mostly Sunny
|
73°F |
3 mph
SE
|
|
Friday Night
Oct 16
|
Light Rain
|
52°F |
2 to 9 mph
SSE
|
|
Saturday
Oct 17
|
Light Rain
|
60°F |
6 mph
WSW
|
|
Saturday Night
Oct 17
|
Partly Cloudy
|
43°F |
5 mph
NNE
|
|
Sunday
Oct 18
|
Partly Sunny
|
56°F |
3 mph
N
|
|
Sunday Night
Oct 18
|
Chance Light Rain
|
45°F |
2 to 6 mph
ENE
|
|
Monday
Oct 19
|
Chance Light Rain
|
55°F |
6 mph
SSE
|
|
Monday Night
Oct 19
|
Chance Light Rain
|
44°F |
5 mph
SE
|
|
Tuesday
Oct 20
|
Slight Chance Light Rain
|
55°F |
5 mph
SSE
|
|
Tuesday Night
Oct 20
|
Partly Cloudy
|
42°F |
5 mph
NNE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around John Sam Lake.