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Irmo, SC weather and climate

Lexington County, SC · population 11,799 · about 371 ft elevation

Everything below is a 30 year average for 1991-2020, computed from daily climate history at Irmo's own coordinates.

The year at a glance

Sunny days
212
clear or partly cloudy, per year
Precipitation
43 in
per year
Wet days
118
rain or snow per year
Snowfall
1 in
per year
Hot days
84
above 90 °F
Freezing nights
61
at or below 32 °F
Humidity
72%
average relative
Average temperature
63 °F
year round

Monthly temperatures

Average daily high and low for each month, in °F.

Daily highDaily low
406080JanMarMayJulSepNovDaily high, Jan: 56 °FDaily high, Feb: 60 °FDaily high, Mar: 68 °FDaily high, Apr: 77 °FDaily high, May: 83 °FDaily high, Jun: 89 °FDaily high, Jul: 92 °FDaily high, Aug: 91 °FDaily high, Sep: 86 °FDaily high, Oct: 76 °FDaily high, Nov: 66 °FDaily high, Dec: 58 °FDaily low, Jan: 33 °FDaily low, Feb: 36 °FDaily low, Mar: 41 °FDaily low, Apr: 49 °FDaily low, May: 59 °FDaily low, Jun: 67 °FDaily low, Jul: 71 °FDaily low, Aug: 70 °FDaily low, Sep: 63 °FDaily low, Oct: 51 °FDaily low, Nov: 40 °FDaily low, Dec: 35 °F
View monthly temperatures as a table
Monthly temperatures (°F)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Daily high566068778389929186766658
Daily low333641495967717063514035

Monthly precipitation

Total rain plus melted snow for each month, in inches.

0.02.04.0JanMarMayJulSepNovIrmo, Jan: 3.5 inIrmo, Feb: 3.5 inIrmo, Mar: 3.7 inIrmo, Apr: 3.3 inIrmo, May: 2.9 inIrmo, Jun: 4.1 inIrmo, Jul: 4.3 inIrmo, Aug: 4.1 inIrmo, Sep: 3.5 inIrmo, Oct: 3.3 inIrmo, Nov: 2.8 inIrmo, Dec: 3.7 in
View monthly precipitation as a table
Monthly precipitation (inches)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Irmo3.53.53.73.32.94.14.34.13.53.32.83.7

Monthly sunny days

Days each month with clear or partly cloudy skies.

01020JanMarMayJulSepNovIrmo, Jan: 17 daysIrmo, Feb: 14 daysIrmo, Mar: 18 daysIrmo, Apr: 19 daysIrmo, May: 19 daysIrmo, Jun: 17 daysIrmo, Jul: 18 daysIrmo, Aug: 18 daysIrmo, Sep: 18 daysIrmo, Oct: 20 daysIrmo, Nov: 19 daysIrmo, Dec: 17 days
View monthly sunny days as a table
Monthly sunny days (days)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Irmo171418191917181818201917

Compare Irmo with another city

Nearby cities and popular picks. Any two cities can be compared from the home page.

See weather for every covered South Carolina city

About this data

Figures are 30 year averages for 1991-2020. Wet days count days with measurable precipitation, calibrated against the wet day counts in NOAA's published climate normals. Sunny days count clear plus partly cloudy days, defined as average cloud cover of 63 percent or less and calibrated against NOAA's published sky cover tables. Snowfall figures are model estimates anchored to NOAA station measurements near each city.

Weather data by Open-Meteo.com (CC BY 4.0). Contains modified Copernicus Climate Change Service information (ERA5, ERA5-Land).