Irmo, SC
Full City Profile · South Carolina · Fairfield County County
3.4
/5.0
B
Good
11,799
Population
1,728/sq mi density
$85,137
Median Income
$39,672 per capita
$193,100
Home Value
$281,024 Zillow
$1,412
Median Rent
28.3% income on rent
64°F
Avg Temperature
296
Violent Crime/100K
1,495 property/100K
B
Overall
3.4 / 5.0
Good overall score based on economy, affordability, safety and education
B+
Economy
3.7 / 5.0
$85,137 median income, 8.3% unemployment
A+
Affordability
5.0 / 5.0
$193,100 home value, $1,412/mo rent
F
Safety
1.0 / 5.0
296 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 64°F (18°C). Winters average 46°F in January while summers reach 82°F in July. Annual precipitation totals 45.2 inches. The area receives 1.2 inches of snow annually.
Temperature
46°F Jan (8°C)
82°F Jul (28°C)
| Annual Average | 64.3°F |
| 19% above US avg | |
| January Average | 46°F (8°C) |
| July Average | 82°F (28°C) |
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
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 | 46°F (8°C) | 3.5 in | Coldest |
| February | 49°F (10°C) | 3.4 in | |
| March | 56°F (13°C) | 3.6 in | |
| April | 64°F (18°C) | 2.8 in | |
| May | 72°F (22°C) | 3.5 in | |
| June | 79°F (26°C) | 5.0 in | |
| July | 82°F (28°C) | 5.4 in | Warmest, Wettest |
| August | 81°F (27°C) | 4.7 in | |
| September | 76°F (24°C) | 3.9 in | |
| October | 65°F (18°C) | 3.1 in | |
| November | 54°F (12°C) | 2.8 in | Driest |
| December | 48°F (9°C) | 3.7 in |
Irmo has a seasonal temperature swing of 37°F / from 46°F in January to 82°F in July. Total annual precipitation is 45.2 inches, with July being the wettest month (5.4") and November the driest (2.8").