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Irmo, SC
Full City Profile · South Carolina · Fairfield County County
3.5
/5.0
B+
Good
11,799
Population
1,728/sq mi density
$85,137
Median Income
$39,672 per capita
$193,100
Home Value
$280,062 Zillow
$1,412
Median Rent
28.3% income on rent
60°F
Avg Temperature
310 sunny days/yr
312
Violent Crime/100K
3,300 property/100K
B+
Overall
3.5 / 5.0
Good overall score based on economy, affordability, safety and education
A
Economy
4.1 / 5.0
$85,137 median income, 5.6% unemployment
A+
Affordability
5.0 / 5.0
$193,100 home value, $1,412/mo rent
F
Safety
1.0 / 5.0
312 violent crimes/100K
B+
Education
4.0 / 5.0
37.3% bachelor's degree or higher
Irmo enjoys a temperate climate with an average annual temperature of 60°F (16°C). Winters average 42°F in January while summers reach 79°F in July. The area gets 310 sunny days per year. Annual precipitation totals 45.5 inches. The area receives 0.8 inches of snow annually. Air quality is rated Good with a median AQI of 43.
Temperature
42°F Jan (5°C)
79°F Jul (26°C)
| Annual Average | 60.2°F |
| 11% above US avg | |
| January Average | 42°F (5°C) |
| July Average | 79°F (26°C) |
| Sunny Days | 310 days/yr |
Geography
| Elevation | 357 ft (109 m) |
| Area | 6.8 sq mi (17.5 km²) |
| Population Density | 1,728/sq mi |
| Coordinates | 34.1021°N, 81.1959°W |
| Timezone | America/New_York |
| County | Fairfield County County |
| Nearest Airport | Aiken Regional (AIK) 42 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 40.8 / 100 |
| Social Vulnerability | 90.1 / 100 |
| Community Resilience | 44.2 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Relatively Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Very Low |
| Strong Wind | Relatively Low |
| Heat Wave | Relatively Low |
| Winter Weather | Very Low |
| Lightning | Relatively Low |
| Ice Storm | Relatively High |
| Drought | Very Low |
| Cold Wave | Relatively Low |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 42°F (5°C) | 4.6 in | Coldest |
| February | 47°F (8°C) | 3.7 in | |
| March | 54°F (12°C) | 4.7 in | |
| April | 62°F (17°C) | 2.9 in | Driest |
| May | 70°F (21°C) | 3.2 in | |
| June | 77°F (25°C) | 4.4 in | |
| July | 79°F (26°C) | 4.8 in | Warmest, Wettest |
| August | 79°F (26°C) | 4.7 in | |
| September | 74°F (23°C) | 3.9 in | |
| October | 63°F (17°C) | 3.3 in | |
| November | 55°F (13°C) | 3.0 in | |
| December | 47°F (8°C) | 3.4 in |
Irmo has a seasonal temperature swing of 38°F / from 42°F in January to 79°F in July. Total annual precipitation is 46.4 inches, with July being the wettest month (4.8") and April the driest (2.9").