Climate and monthly weather forecastJohns Island, SC
Climate and monthly weather forecast
Weather in January
January, like December, is another refreshing winter month in Johns Island, South Carolina, with an average temperature ranging between min 42.8°F (6°C) and max 56.8°F (13.8°C). Johns Island's January weather reaches an average high of 56.8°F (13.8°C) and an average low of 42.8°F (6°C), making it the coldest month. Weather in January »Weather in February
February, the last month of the winter in Johns Island, is another refreshing month, with an average temperature fluctuating between 60.6°F (15.9°C) and 45.9°F (7.7°C). Johns Island's February showcases an average high-temperature of a still moderate 60.6°F (15.9°C), hardly distinct from January's 56.8°F (13.8°C). Weather in February »Weather in March
March, the first month of the spring in Johns Island, is a refreshing month, with an average temperature ranging between min 51.6°F (10.9°C) and max 66.2°F (19°C). As March arrives, Johns Island's weather shows a minor increase in high-temperatures, edging from February's mild 60.6°F (15.9°C) to a still refreshing 66.2°F (19°C). Weather in March »Weather in April
April is a warm spring month in Johns Island, South Carolina, with an average temperature varying between 74.1°F (23.4°C) and 59°F (15°C). April witnesses a subtle temperature ascent, adjusting from an enjoyable 66.2°F (19°C) in March to a moderately hot 74.1°F (23.4°C). Weather in April »Weather in May
The last month of the spring, May, is also a moderately hot month in Johns Island, South Carolina, with an average temperature varying between 66.7°F (19.3°C) and 80.8°F (27.1°C). The beginning of May marks a minor shift in the average high-temperature, moving from April's 74.1°F (23.4°C) to a still moderately hot 80.8°F (27.1°C). Weather in May »Weather in June
The first month of the summer, June, is a hot month in Johns Island, South Carolina, with an average temperature varying between 87.1°F (30.6°C) and 73.4°F (23°C). In June, the average high-temperature marginally rises from a warm 80.8°F (27.1°C) in May to a tropical 87.1°F (30.6°C). Weather in June »Weather in July
July, the same as June, in Johns Island, South Carolina, is another hot summer month, with an average temperature varying between 89.6°F (32°C) and 76.5°F (24.7°C). July tends to be the warmest month, with temperatures averaging a daily high of 89.6°F (32°C) and a low of 76.5°F (24.7°C). For July, the heat index is appraised at a blisteringly hot 107.6°F (42°C). Weather in July »Weather in August
The last month of the summer, August, is also a hot month in Johns Island, South Carolina, with an average temperature varying between 76.3°F (24.6°C) and 88.3°F (31.3°C). August reports an average high-temperature of a still hot 88.3°F (31.3°C), slightly varied from July's 89.6°F (32°C). Weather in August »Weather in September
September, the first month of the autumn in Johns Island, is still a warm month, with an average temperature ranging between min 72°F (22.2°C) and max 84.4°F (29.1°C). As September unfolds, the average high-temperature reaches a warm 84.4°F (29.1°C), hinting at a slight fluctuation from the previous month. Weather in September »Weather in October
October, the same as September, is a moderately hot autumn month in Johns Island, South Carolina, with temperature in the range of an average high of 76.1°F (24.5°C) and an average low of 62.1°F (16.7°C). The onset of October aligns with a soft reduction in the average high-temperature, gently falling from 84.4°F (29.1°C) in September to a still moderately hot 76.1°F (24.5°C). Weather in October »Weather in November
November, the last month of the autumn in Johns Island, is also an enjoyable month, with an average temperature ranging between min 51.8°F (11°C) and max 65.8°F (18.8°C). A moderate decline in the average high-temperature is seen during November, decreasing from a moderately hot 76.1°F (24.5°C) in October to a refreshing 65.8°F (18.8°C). Weather in November »Weather in December
December, the first month of the winter in Johns Island, is still a refreshing month, with an average temperature ranging between min 47.3°F (8.5°C) and max 60.4°F (15.8°C). In December, the average high-temperature marginally decreases from a refreshing 65.8°F (18.8°C) in November to a moderate 60.4°F (15.8°C). Weather in December »Updated: Feb 13, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
January, noted for its average high-temperature of 56.8°F (13.8°C) and an average low-temperature of 42.8°F (6°C), is considered the coldest month in Johns Island, South Carolina.
The month with the least rainfall in Johns Island, South Carolina, is January, when the rain falls for 8.8 days and typically collects 0.67" (17mm) of precipitation.
Throughout the year, in Johns Island, South Carolina, there are 154.4 rainfall days, and 23.43" (595mm) of precipitation is accumulated.
January, February and December are months with snowfall in Johns Island, South Carolina.
In Johns Island, during the entire year, snow falls for 0.5 days.
January is the month with the lowest UV index in Johns Island, South Carolina, with an average maximum UV index of 3.
With an average relative humidity of 72%, March is the least humid month.
March through November are months without snowfall.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Johns Island, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from EDT to EST.
May through August, with an average maximum UV index of 7, are months with the highest UV index.
With an average of 14h and 18min of daylight, June has the longest days of the year.
July tends to be the warmest month in Johns Island, with temperatures averaging a daily high of 89.6°F (32°C) and a low of 76.5°F (24.7°C).
With an average of 10.9h of sunshine, July has the most sunshine of the year in Johns Island.
August is the month with the most rainfall. Rain falls for 22.7 days and accumulates 4.29" (109mm) of precipitation.
With an average relative humidity of 77%, December is the most humid month.
The month with the most snowfall days in Johns Island, South Carolina, is December, when snow falls for 0.3 days.
December has the shortest days of the year in Johns Island, South Carolina, with an average of 10h and 0min of daylight.
With an average of 5.6h of sunshine, December has the least sunshine of the year.
Average temperature
Johns Island, SC
The warmest month (with the highest average high temperature) is July (89.6°F).
The month with the lowest average high temperature is January (56.8°F).
The month with the highest average low temperature is July (76.5°F).
The coldest month (with the lowest average low temperature) is January (42.8°F).
Average pressure
Johns Island, SC
- Average pressure in January:
30.14"Hg - Average pressure in February:
30.11"Hg - Average pressure in March:
30.09"Hg - Average pressure in April:
30.03"Hg - Average pressure in May:
30.03"Hg - Average pressure in June:
29.98"Hg
- Average pressure in July:
30"Hg - Average pressure in August:
29.99"Hg - Average pressure in September:
30"Hg - Average pressure in October:
30.03"Hg - Average pressure in November:
30.12"Hg - Average pressure in December:
30.13"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.98"Hg).
Average wind speed
Johns Island, SC
- Average wind speed in January:
7.8mph - Average wind speed in February:
8.1mph - Average wind speed in March:
8.1mph - Average wind speed in April:
8.3mph - Average wind speed in May:
7.5mph - Average wind speed in June:
7mph
- Average wind speed in July:
7mph - Average wind speed in August:
6.5mph - Average wind speed in September:
7.1mph - Average wind speed in October:
7.5mph - Average wind speed in November:
7.6mph - Average wind speed in December:
7.6mph
The windiest month (with the highest average wind speed) is April (8.3mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).
Average humidity
Johns Island, SC
The month with the highest relative humidity is December (77%).
The month with the lowest relative humidity is March (72%).
Average rainfall
Johns Island, SC
- Average rainfall in January:
0.67" - Average rainfall in February:
0.91" - Average rainfall in March:
1.14" - Average rainfall in April:
1.65" - Average rainfall in May:
1.42" - Average rainfall in June:
2.6"
- Average rainfall in July:
2.68" - Average rainfall in August:
4.29" - Average rainfall in September:
2.76" - Average rainfall in October:
1.89" - Average rainfall in November:
1.02" - Average rainfall in December:
2.4"
The wettest month (with the highest rainfall) is August (4.29").
The driest month (with the least rainfall) is January (0.67").
Average rainfall days
Johns Island, SC
- Average rainfall days in January:
8.8 days - Average rainfall days in February:
8.8 days - Average rainfall days in March:
9.9 days - Average rainfall days in April:
11.4 days - Average rainfall days in May:
13.4 days - Average rainfall days in June:
17.3 days
- Average rainfall days in July:
21.2 days - Average rainfall days in August:
22.7 days - Average rainfall days in September:
14.8 days - Average rainfall days in October:
9.7 days - Average rainfall days in November:
6.9 days - Average rainfall days in December:
9.5 days
The month with the highest number of rainy days is August (22.7 days).
The month with the least rainy days is November (6.9 days).
Average snowfall days
Johns Island, SC
- Average snowfall days in January:
0.1 days - Average snowfall days in February:
0.1 days - Average snowfall days in March:
0 days - Average snowfall days in April:
0 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0 days - Average snowfall days in December:
0.3 days
The month with the highest number of snowfall days is December (0.3 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October and November (0 days).
Average daylight / Average sunshine
Johns Island, SC
- Average daylight in January:
10h and 18min - Average daylight in February:
11h and 0min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 0min - Average daylight in May:
13h and 54min - Average daylight in June:
14h and 18min
- Average daylight in July:
14h and 6min - Average daylight in August:
13h and 18min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 24min - Average daylight in November:
10h and 30min - Average daylight in December:
10h and 0min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in January:
5h and 48min - Average sunshine in February:
6h and 36min - Average sunshine in March:
7h and 36min - Average sunshine in April:
9h and 42min - Average sunshine in May:
10h and 24min - Average sunshine in June:
10h and 48min
- Average sunshine in July:
10h and 54min - Average sunshine in August:
10h and 42min - Average sunshine in September:
9h and 0min - Average sunshine in October:
6h and 42min - Average sunshine in November:
6h and 6min - Average sunshine in December:
5h and 36min
The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 36min).
Average sunshine days
Johns Island, SC
- Average sunshine days in January:
20.1 days - Average sunshine days in February:
17.2 days - Average sunshine days in March:
19.1 days - Average sunshine days in April:
17.7 days - Average sunshine days in May:
15.8 days - Average sunshine days in June:
9.7 days
- Average sunshine days in July:
6.9 days - Average sunshine days in August:
6.1 days - Average sunshine days in September:
11 days - Average sunshine days in October:
19.3 days - Average sunshine days in November:
20.4 days - Average sunshine days in December:
19 days
The month with the most sunshine days is November (20.4 days).
The month with the least sunshine days is August (6.1 days).
Average UV index
Johns Island, SC
The months with the highest UV index are May, June, July and August (UV index 7).
The month with the lowest UV index is January (UV index 3).
Average cloud cover
Johns Island, SC
The month with the most cloud cover is December (Cloud cover 40).
The months with the least cloud cover are June and July (Cloud cover 26).
Average visibility
Johns Island, SC
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
