Weather in James Island, SC
James Island, Sunday, 9 August, 04:19
Overcast. Feels like 79°. High 91°, low 76°.
Monthly outlook for James Island, SC: average high 90.6°, average low 77.3°. That is 2.7° above the climate normal for August. Precipitation is expected on 10 days (about 3.3 inches), against a normal of 10 days and 3.4 inches. The warmest day looks like 13 August (97.4°), the coolest 17 August (74.1°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 90.9° | 85.9° | +2.8° |
| 19 August – 28 August | 90.2° | 85.2° | +2.8° |
| 29 August – 7 September | at normal | 83.8° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Charleston (6 mi).
0.26
James Island, Monday, 10 August
Light rain. High 93°, low 77°.
0.04James Island, Tuesday, 11 August
Light rain. High 96°, low 78°.
0
James Island, Wednesday, 12 August
Partly cloudy. High 97°, low 79°.
0.3James Island, Thursday, 13 August
Rain. High 97°, low 78°.
1.1James Island, Friday, 14 August
Heavy rain. High 95°, low 76°.
0.35James Island, Saturday, 15 August
Rain. High 85°, low 75°.
0.34James Island, Sunday, 16 August
Rain. High 84°, low 76°.
0.71James Island, Monday, 17 August
Rain. High 82°, low 74°.
0.04James Island, Tuesday, 18 August
Light rain. High 88°, low 75°.
0.1James Island, Wednesday, 19 August
Light rain. High 90°, low 79°.
0
James Island, Thursday, 20 August
Clear. High 91°, low 79°.
0James Island, Friday, 21 August
Overcast. High 91°, low 78°.
0.06James Island, Saturday, 22 August
Light rain. High 91°, low 79°.
0.03James Island, Sunday, 23 August
Light rain. High 89°, low 79°.
0James Island, Monday, 24 August
Overcast. High 89°, low 79°.
0.22James Island, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.17James Island, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.18James Island, Thursday, 27 August
Climate normal for this date — 60-year average.
0.28James Island, Friday, 28 August
Climate normal for this date — 60-year average.
0.18
James Island, Saturday, 29 August
Climate normal for this date — 60-year average.
0.28James Island, Sunday, 30 August
Climate normal for this date — 60-year average.
0.22James Island, Monday, 31 August
Climate normal for this date — 60-year average.
0.16James Island, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.19James Island, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.15James Island, Thursday, 3 September
Climate normal for this date — 60-year average.
0.21James Island, Friday, 4 September
Climate normal for this date — 60-year average.
0.37James Island, Saturday, 5 September
Climate normal for this date — 60-year average.
0.19James Island, Sunday, 6 September
Climate normal for this date — 60-year average.
0.12James Island, Monday, 7 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 James Island, SC 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 James Island, SC 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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