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Hilton Head, South Carolina climate
Cfa Humid subtropical
Hilton Head has a seasonal warm-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is July with an average daily high near 34°C, while the coldest is January averaging around 4°C at night. Around 1222 mm of precipitation falls each year, peaking in June (169 mm) and easing off in November (61 mm).
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresClear vs cloudy days
Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day countsHilton Head climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 16 | 18 | 22 | 26 | 29 | 32 | 34 | 33 | 30 | 26 | 21 | 18 |
| Avg temp (°C) | 10 | 12 | 16 | 19 | 23 | 27 | 28 | 28 | 25 | 20 | 15 | 12 |
| Avg low (°C) | 4 | 6 | 9 | 13 | 17 | 22 | 23 | 23 | 21 | 15 | 9 | 6 |
| Precipitation (mm) | 83 | 71 | 89 | 86 | 92 | 169 | 146 | 139 | 110 | 94 | 61 | 82 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 16 | 18 | 22 | 26 | 29 | 32 |
| Avg temp (°C) | 10 | 12 | 16 | 19 | 23 | 27 |
| Avg low (°C) | 4 | 6 | 9 | 13 | 17 | 22 |
| Precipitation (mm) | 83 | 71 | 89 | 86 | 92 | 169 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 34 | 33 | 30 | 26 | 21 | 18 |
| Avg temp (°C) | 28 | 28 | 25 | 20 | 15 | 12 |
| Avg low (°C) | 23 | 23 | 21 | 15 | 9 | 6 |
| Precipitation (mm) | 146 | 139 | 110 | 94 | 61 | 82 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 9 | 8 | 8 | 7 | 7 | 12 | 12 | 13 | 10 | 7 | 7 | 8 |
| Days with high ≥ 32°C (days) | — | — | 0.1 | 1 | 7 | 17 | 25 | 21 | 10 | 0.9 | — | — |
| Days with low ≤ 0°C (days) | 9 | 4 | 1 | 0.1 | — | — | — | — | — | — | 1 | 6 |
| Days with snowfall ≥ 2.5 cm (days) | 0.0 | — | — | — | — | — | — | — | — | — | — | — |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 9 | 8 | 8 | 7 | 7 | 12 |
| Days with high ≥ 32°C (days) | — | — | 0.1 | 1 | 7 | 17 |
| Days with low ≤ 0°C (days) | 9 | 4 | 1 | 0.1 | — | — |
| Days with snowfall ≥ 2.5 cm (days) | 0.0 | — | — | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 12 | 13 | 10 | 7 | 7 | 8 |
| Days with high ≥ 32°C (days) | 25 | 21 | 10 | 0.9 | — | — |
| Days with low ≤ 0°C (days) | — | — | — | — | 1 | 6 |
| Days with snowfall ≥ 2.5 cm (days) | — | — | — | — | — | — |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 56 | 58 | 53 | 49 | 50 | 55 | 56 | 56 | 51 | 44 | 46 | 55 |
| Clear days (≤ 30% cloud) | 8 | 7 | 9 | 11 | 10 | 7 | 6 | 6 | 9 | 13 | 12 | 9 |
| Partly cloudy days (30–70%) | 10 | 9 | 10 | 10 | 12 | 13 | 15 | 13 | 11 | 9 | 9 | 9 |
| Cloudy days (≥ 70%) | 13 | 12 | 11 | 10 | 9 | 10 | 10 | 12 | 10 | 9 | 9 | 13 |
| Relative humidity (%) | 81 | 80 | 77 | 73 | 71 | 74 | 75 | 77 | 78 | 77 | 78 | 81 |
| Wind speed (km/h) | 4.2 | 4.2 | 4.5 | 4.5 | 4.2 | 3.9 | 3.7 | 3.7 | 4.3 | 4.4 | 4.2 | 4.1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 56 | 58 | 53 | 49 | 50 | 55 |
| Clear days (≤ 30% cloud) | 8 | 7 | 9 | 11 | 10 | 7 |
| Partly cloudy days (30–70%) | 10 | 9 | 10 | 10 | 12 | 13 |
| Cloudy days (≥ 70%) | 13 | 12 | 11 | 10 | 9 | 10 |
| Relative humidity (%) | 81 | 80 | 77 | 73 | 71 | 74 |
| Wind speed (km/h) | 4.2 | 4.2 | 4.5 | 4.5 | 4.2 | 3.9 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 56 | 56 | 51 | 44 | 46 | 55 |
| Clear days (≤ 30% cloud) | 6 | 6 | 9 | 13 | 12 | 9 |
| Partly cloudy days (30–70%) | 15 | 13 | 11 | 9 | 9 | 9 |
| Cloudy days (≥ 70%) | 10 | 12 | 10 | 9 | 9 | 13 |
| Relative humidity (%) | 75 | 77 | 78 | 77 | 78 | 81 |
| Wind speed (km/h) | 3.7 | 3.7 | 4.3 | 4.4 | 4.2 | 4.1 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Savannah Intl AP (NOAA GHCN station USW00003822), about 43 km from the city centre.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.