Weather in John Sam Lake, WA
John Sam Lake, Saturday, 8 August, 23:20
Mostly clear. Feels like 59°. High 82°, low 57°.
Monthly outlook for John Sam Lake, WA: average high 75.3°, average low 53°. That is 0.7° above the climate normal for August. Precipitation is expected on 0 days (about 0.0 inches), against a normal of 3 days and 0.9 inches. The warmest day looks like 16 August (81.9°), the coolest 10 August (50.4°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 8 August – 17 August | 77.1° | 74.9° | +1.2° |
| 18 August – 27 August | 72.4° | 72.9° | -0.3° |
| 28 August – 6 September | at normal | 70.9° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Marysville (4 mi).
0
John Sam Lake, Sunday, 9 August
Overcast. High 76°, low 51°.
0
John Sam Lake, Monday, 10 August
Partly cloudy. High 77°, low 50°.
0
John Sam Lake, Tuesday, 11 August
Mostly clear. High 71°, low 52°.
0
John Sam Lake, Wednesday, 12 August
Clear. High 74°, low 52°.
0John Sam Lake, Thursday, 13 August
Clear. High 74°, low 52°.
0John Sam Lake, Friday, 14 August
Clear. High 77°, low 54°.
0John Sam Lake, Saturday, 15 August
Mostly clear. High 81°, low 56°.
0John Sam Lake, Sunday, 16 August
Mostly clear. High 82°, low 56°.
0John Sam Lake, Monday, 17 August
Mostly clear. High 77°, low 54°.
0John Sam Lake, Tuesday, 18 August
Partly cloudy. High 75°, low 53°.
0John Sam Lake, Wednesday, 19 August
Overcast. High 73°, low 52°.
0John Sam Lake, Thursday, 20 August
Clear. High 70°, low 53°.
0John Sam Lake, Friday, 21 August
Mostly clear. High 71°, low 51°.
0John Sam Lake, Saturday, 22 August
Overcast. High 75°, low 52°.
0John Sam Lake, Sunday, 23 August
Overcast. High 70°, low 52°.
0.07John Sam Lake, Monday, 24 August
Climate normal for this date — 60-year average.
0.07John Sam Lake, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.06John Sam Lake, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.13John Sam Lake, Thursday, 27 August
Climate normal for this date — 60-year average.
0.06John Sam Lake, Friday, 28 August
Climate normal for this date — 60-year average.
0.1
John Sam Lake, Saturday, 29 August
Climate normal for this date — 60-year average.
0.09John Sam Lake, Sunday, 30 August
Climate normal for this date — 60-year average.
0.08John Sam Lake, Monday, 31 August
Climate normal for this date — 60-year average.
0.16John Sam Lake, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.09John Sam Lake, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.09John Sam Lake, Thursday, 3 September
Climate normal for this date — 60-year average.
0.06John Sam Lake, Friday, 4 September
Climate normal for this date — 60-year average.
0.1John Sam Lake, Saturday, 5 September
Climate normal for this date — 60-year average.
0.13John Sam Lake, Sunday, 6 September
Climate normal for this date — 60-year average.
About the monthly outlook
How accurate is a 30-day forecast?
The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for John Sam Lake, WA are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.
What does "above normal" mean?
We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.
Where do the 66-year records come from?
They are real temperature extremes recorded in John Sam Lake, WA since 1960: the highest and lowest reading for each calendar date, with the year it happened.
How often is it updated?
The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.
Sun and moon today
Weather history
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