Weather in Siam, TN
Siam, Saturday, 8 August, 19:59
Partly cloudy. Feels like 77°. High 84°, low 68°.
Monthly outlook for Siam, TN: average high 83.1°, average low 66.5°. That is 0.9° above the climate normal for August. Precipitation is expected on 14 days (about 3.6 inches), against a normal of 7 days and 1.7 inches. The warmest day looks like 20 August (89.1°), the coolest 15 August (57.1°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 8 August – 17 August | 83.3° | 81.5° | +1° |
| 18 August – 27 August | 82.8° | 81.5° | +0.7° |
| 28 August – 6 September | at normal | 80.3° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Johnson City (13 mi).
0.37
Siam, Sunday, 9 August
Rain. High 83°, low 69°.
0.09Siam, Monday, 10 August
Light rain. High 88°, low 68°.
0.43Siam, Tuesday, 11 August
Heavy rain. High 86°, low 69°.
0.37Siam, Wednesday, 12 August
Rain. High 85°, low 69°.
0.4Siam, Thursday, 13 August
Rain. High 86°, low 68°.
0.7Siam, Friday, 14 August
Rain. High 71°, low 64°.
0
Siam, Saturday, 15 August
Mostly clear. High 80°, low 57°.
0.01Siam, Sunday, 16 August
Light rain. High 84°, low 60°.
0.04Siam, Monday, 17 August
Light rain. High 86°, low 63°.
0.23Siam, Tuesday, 18 August
Rain. High 80°, low 67°.
0.11Siam, Wednesday, 19 August
Light rain. High 88°, low 71°.
0.12Siam, Thursday, 20 August
Light rain. High 89°, low 68°.
0.18Siam, Friday, 21 August
Light rain. High 82°, low 70°.
0.28Siam, Saturday, 22 August
Light rain. High 77°, low 69°.
0.04Siam, Sunday, 23 August
Light rain. High 81°, low 65°.
0.1
Siam, Monday, 24 August
Climate normal for this date — 60-year average.
0.07Siam, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.07Siam, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.15Siam, Thursday, 27 August
Climate normal for this date — 60-year average.
0.08Siam, Friday, 28 August
Climate normal for this date — 60-year average.
0.06Siam, Saturday, 29 August
Climate normal for this date — 60-year average.
0.06Siam, Sunday, 30 August
Climate normal for this date — 60-year average.
0.1Siam, Monday, 31 August
Climate normal for this date — 60-year average.
0.15Siam, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.08Siam, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.1Siam, Thursday, 3 September
Climate normal for this date — 60-year average.
0.15Siam, Friday, 4 September
Climate normal for this date — 60-year average.
0.17Siam, Saturday, 5 September
Climate normal for this date — 60-year average.
0.12Siam, 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 Siam, TN 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 Siam, TN 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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