Weather in Hilton Head Island, SC
Hilton Head Island, Sunday, 9 August, 12:11
Overcast. Feels like 96°. High 87°, low 75°.
Monthly outlook for Hilton Head Island, SC: average high 90.2°, average low 77.4°. That is 2.9° above the climate normal for August. Precipitation is expected on 11 days (about 2.9 inches), against a normal of 10 days and 3.0 inches. The warmest day looks like 12 August (95.7°), the coolest 20 August (74.1°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 91.6° | 85.1° | +3.6° |
| 19 August – 28 August | 87.8° | 84.5° | +1.9° |
| 29 August – 7 September | at normal | 83.1° | — |
August records over 66 years
0.11
Hilton Head Island, Monday, 10 August
Rain. High 92°, low 76°.
0.02Hilton Head Island, Tuesday, 11 August
Light rain. High 95°, low 78°.
0.01Hilton Head Island, Wednesday, 12 August
Light rain. High 96°, low 79°.
0.06Hilton Head Island, Thursday, 13 August
Light rain. High 96°, low 77°.
0.16Hilton Head Island, Friday, 14 August
Light rain. High 93°, low 78°.
0.39Hilton Head Island, Saturday, 15 August
Rain. High 95°, low 79°.
0.07Hilton Head Island, Sunday, 16 August
Light rain. High 85°, low 77°.
0.02Hilton Head Island, Monday, 17 August
Light rain. High 87°, low 80°.
1.16Hilton Head Island, Tuesday, 18 August
Heavy rain. High 91°, low 78°.
0.11Hilton Head Island, Wednesday, 19 August
Light rain. High 90°, low 75°.
0.21Hilton Head Island, Thursday, 20 August
Light rain. High 82°, low 74°.
0.05Hilton Head Island, Friday, 21 August
Light rain. High 93°, low 77°.
0.02Hilton Head Island, Saturday, 22 August
Light rain. High 86°, low 76°.
0Hilton Head Island, Sunday, 23 August
Overcast. High 89°, low 80°.
0.29Hilton Head Island, Monday, 24 August
Rain. High 86°, low 80°.
0.24Hilton Head Island, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.18Hilton Head Island, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.17Hilton Head Island, Thursday, 27 August
Climate normal for this date — 60-year average.
0.2Hilton Head Island, Friday, 28 August
Climate normal for this date — 60-year average.
0.16Hilton Head Island, Saturday, 29 August
Climate normal for this date — 60-year average.
0.34Hilton Head Island, Sunday, 30 August
Climate normal for this date — 60-year average.
0.22Hilton Head Island, Monday, 31 August
Climate normal for this date — 60-year average.
0.2Hilton Head Island, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.25Hilton Head Island, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.17Hilton Head Island, Thursday, 3 September
Climate normal for this date — 60-year average.
0.22Hilton Head Island, Friday, 4 September
Climate normal for this date — 60-year average.
0.31Hilton Head Island, Saturday, 5 September
Climate normal for this date — 60-year average.
0.25Hilton Head Island, Sunday, 6 September
Climate normal for this date — 60-year average.
0.14Hilton Head 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 Hilton Head 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 Hilton Head 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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