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Contents
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Weather in January
January, like December, is a frosty winter month in Irwin, South Carolina, with temperature in the range of an average high of 49.8°F (9.9°C) and an average low of 35.2°F (1.8°C). January is the coldest month, with an average high-temperature of 49.8°F (9.9°C) and an average low-temperature of 35.2°F (1.8°C). Weather in January »
Weather in February
February, the last month of the winter in Irwin, is a fresh month, with an average temperature ranging between min 38.1°F (3.4°C) and max 55°F (12.8°C). Irwin notes an average high-temperature of a cool 55°F (12.8°C) in February, hardly diverging from January. Weather in February »
Weather in March
March, the first month of the spring in Irwin, is a refreshing month, with an average temperature ranging between max 62.1°F (16.7°C) and min 44.2°F (6.8°C). The shift into March is characterized by a subtle rise in the average high-temperature, transitioning from February's cool 55°F (12.8°C) to a comfortable 62.1°F (16.7°C). Weather in March »
Weather in April
April in Irwin, South Carolina, is a pleasant spring month, with an average temperature fluctuating between 71.6°F (22°C) and 53.2°F (11.8°C). Observing a rise in April, the average high-temperature goes from March's refreshing 62.1°F (16.7°C) to an agreeable 71.6°F (22°C). Weather in April »
Weather in May
May, the last month of the spring in Irwin, is a moderately hot month, with an average temperature ranging between max 79.9°F (26.6°C) and min 61°F (16.1°C). With the transition into May, Irwin experiences a subtle uplift in average high-temperatures, adjusting from an agreeable 71.6°F (22°C) in April to a moderately hot 79.9°F (26.6°C). Weather in May »
Weather in June
The first month of the summer, June, is a hot month in Irwin, South Carolina, with temperature in the range of an average high of 87.3°F (30.7°C) and an average low of 68.2°F (20.1°C). As Irwin welcomes June, the average high-temperature sees a modest rise, transitioning from a moderately hot 79.9°F (26.6°C) in May to a tropical 87.3°F (30.7°C). Weather in June »
Weather in July
July, like June, is another tropical summer month in Irwin, South Carolina, with an average temperature ranging between max 90.3°F (32.4°C) and min 71.2°F (21.8°C). With an average high-temperature of 90.3°F (32.4°C) and an average low-temperature of 71.2°F (21.8°C), July is the warmest month. In July, the heat index is calculated to be an extremely 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 Irwin, South Carolina, with an average temperature ranging between min 69.8°F (21°C) and max 88.3°F (31.3°C). Irwin marks the onset of August with an average high-temperature of a still tropical 88.3°F (31.3°C), a subtle shift from July's 90.3°F (32.4°C). Weather in August »
Weather in September
September, the first month of the autumn in Irwin, is also a moderately hot month, with an average temperature varying between 64.9°F (18.3°C) and 82.9°F (28.3°C). With the onset of September, Irwin's average high-temperature slightly adjusts, moderately receding from August's tropical 88.3°F (31.3°C) to a moderately hot 82.9°F (28.3°C). Weather in September »
Weather in October
October, like September, is an agreeable autumn month in Irwin, South Carolina, with an average temperature fluctuating between 71.8°F (22.1°C) and 54.1°F (12.3°C). October's arrival correlates with a reduction in the average high-temperature, down from a warm 82.9°F (28.3°C) in September to a pleasant 71.8°F (22.1°C). Weather in October »
Weather in November
November, the last month of the autumn in Irwin, is another refreshing month, with an average temperature fluctuating between 43.5°F (6.4°C) and 60.4°F (15.8°C). The onset of November brings a small change in high-temperatures, falling from a pleasant 71.8°F (22.1°C) in October to a mild 60.4°F (15.8°C). Weather in November »
Weather in December
December, the first month of the winter in Irwin, is still a cool month, with an average temperature fluctuating between 54.1°F (12.3°C) and 39.7°F (4.3°C). December is characterized by a mild reduction in the average high-temperature, from a mild 60.4°F (15.8°C) in November to a cool 54.1°F (12.3°C). Weather in December »
Updated: Jul 18, 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
What month is the coldest?
The coldest month is January, with an average high-temperature of 49.8°F (9.9°C) and an average low-temperature of 35.2°F (1.8°C).
How many days does it rain?
In Irwin, South Carolina, during the entire year, the rain falls for 120.6 days and collects up to 11.97" (304mm) of precipitation.
When does it snow?
Months with snowfall are January and February.
How much does it snow in Irwin?
Throughout the year, there are 1.2 snowfall days, and 0.2" (5mm) of snow is accumulated.
What is the month with the lowest UV index?
The month with the lowest UV index is January, with an average maximum UV index of 2.
When does it snow the most?
February is the month with the most snowfall. Snow falls for 0.5 days and accumulates 0.12" (3mm) of snow.
When it does not snow?
March through December are months without snowfall.
When is Daylight Saving Time (DST) in Irwin?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, 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.
What is the most humid month?
May and December, with an average relative humidity of 75%, are most humid months.
What is the least humid month?
The months with the lowest humidity are June, July and November, with an average relative humidity of 71%.
When are the longest days?
With an average of 14h and 24min of daylight, June has the longest days of the year.
When is the highest UV index?
June and July, with an average maximum UV index of 7, are months with the highest UV index.
What month is the hottest?
With an average high-temperature of 90.3°F (32.4°C) and an average low-temperature of 71.2°F (21.8°C), July is the warmest month.
What month has the most sunshine?
The month with the most sunshine is July, with an average of 10.9h of sunshine.
What is the wettest month?
August is the month with the most rainfall. Rain falls for 13.2 days and accumulates 1.61" (41mm) of precipitation.
What is the driest month?
September is the month with the least rainfall. Rain falls for 9.6 days and accumulates 0.51" (13mm) of precipitation.
What is the month with the shortest days?
With an average of 9h and 54min of daylight, December has the shortest days of the year.
What is the month with the least sunshine?
With an average of 5.5h of sunshine, December has the least sunshine of the year.
Average temperature
Irwin, SC
The warmest month (with the highest average high temperature) is July (90.3°F).
The month with the lowest average high temperature is January (49.8°F).
The month with the highest average low temperature is July (71.2°F).
The coldest month (with the lowest average low temperature) is January (35.2°F).
Average pressure
Irwin, 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:
30.01"Hg - Average pressure in May:
30.03"Hg - Average pressure in June:
29.97"Hg
- Average pressure in July:
29.99"Hg - Average pressure in August:
30"Hg - Average pressure in September:
30.03"Hg - Average pressure in October:
30.05"Hg - Average pressure in November:
30.15"Hg - Average pressure in December:
30.14"Hg
The month with the highest atmospheric pressure is November (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.97"Hg).
Average wind speed
Irwin, SC
- Average wind speed in January:
7.5mph - Average wind speed in February:
8mph - Average wind speed in March:
7.9mph - Average wind speed in April:
8mph - Average wind speed in May:
6.5mph - Average wind speed in June:
5.7mph
- Average wind speed in July:
5.3mph - Average wind speed in August:
4.8mph - Average wind speed in September:
5.5mph - Average wind speed in October:
6.5mph - Average wind speed in November:
6.6mph - Average wind speed in December:
6.9mph
The windiest months (with the highest average wind speed) are February and April (8mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity
Irwin, SC
The months with the highest relative humidity are May and December (75%).
The months with the lowest relative humidity are June, July and November (71%).
Average rainfall
Irwin, SC
- Average rainfall in January:
0.79" - Average rainfall in February:
0.75" - Average rainfall in March:
0.91" - Average rainfall in April:
1.02" - Average rainfall in May:
1.14" - Average rainfall in June:
1.22"
- Average rainfall in July:
1.54" - Average rainfall in August:
1.61" - Average rainfall in September:
0.51" - Average rainfall in October:
0.71" - Average rainfall in November:
0.75" - Average rainfall in December:
1.02"
The wettest month (with the highest rainfall) is August (1.61").
The driest month (with the least rainfall) is September (0.51").
Average rainfall days
Irwin, SC
- Average rainfall days in January:
7.7 days - Average rainfall days in February:
8 days - Average rainfall days in March:
10.8 days - Average rainfall days in April:
10.9 days - Average rainfall days in May:
11.8 days - Average rainfall days in June:
12.8 days
- Average rainfall days in July:
14.9 days - Average rainfall days in August:
13.2 days - Average rainfall days in September:
9.6 days - Average rainfall days in October:
6.5 days - Average rainfall days in November:
5.9 days - Average rainfall days in December:
8.5 days
The month with the highest number of rainy days is July (14.9 days).
The month with the least rainy days is November (5.9 days).
Average snowfall
Irwin, SC
The month with the highest snowfall is February (0.12").
The months with the least snowfall are March, April, May, June, July, August, September, October, November and December (0").
Average snowfall days
Irwin, SC
- Average snowfall days in January:
0.4 days - Average snowfall days in February:
0.5 days - Average snowfall days in March:
0.1 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:
0.1 days - Average snowfall days in December:
0.1 days
The month with the highest number of snowfall days is February (0.5 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Irwin, SC
- Average daylight in January:
10h and 1min - Average daylight in February:
11h and 0min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 1min - Average daylight in May:
14h and 0min - Average daylight in June:
14h and 2min
- Average daylight in July:
14h and 1min - Average daylight in August:
13h and 2min - Average daylight in September:
12h and 2min - Average daylight in October:
11h and 2min - Average daylight in November:
10h and 2min - Average daylight in December:
9h and 5min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in January:
5h and 4min - Average sunshine in February:
6h and 2min - Average sunshine in March:
7h and 2min - Average sunshine in April:
9h and 1min - Average sunshine in May:
9h and 5min - Average sunshine in June:
10h and 5min
- Average sunshine in July:
10h and 5min - Average sunshine in August:
10h and 2min - Average sunshine in September:
8h and 5min - Average sunshine in October:
6h and 4min - Average sunshine in November:
5h and 5min - Average sunshine in December:
5h and 3min
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 30min).
Average sunshine days
Irwin, SC
- Average sunshine days in January:
21.8 days - Average sunshine days in February:
18.3 days - Average sunshine days in March:
18.5 days - Average sunshine days in April:
16.9 days - Average sunshine days in May:
16.3 days - Average sunshine days in June:
14.6 days
- Average sunshine days in July:
12.9 days - Average sunshine days in August:
14.7 days - Average sunshine days in September:
18.3 days - Average sunshine days in October:
23.5 days - Average sunshine days in November:
21.9 days - Average sunshine days in December:
20.6 days
The month with the most sunshine days is October (23.5 days).
The month with the least sunshine days is July (12.9 days).
Average UV index
Irwin, SC
The months with the highest UV index are June and July (UV index 7).
The month with the lowest UV index is January (UV index 2).
Average cloud cover
Irwin, SC
The month with the most cloud cover is February (Cloud cover 42).
The month with the least cloud cover is June (Cloud cover 28).
Average visibility
Irwin, 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).
Irwin, South Carolina, USA
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