Irmo, SC Weather & Climate Normals
What a normal year in Irmo actually looks like
On the 30-year record NOAA keeps for Irmo, SC, the comfort score comes out to 47/100, strongly seasonal: Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. Only 4 months a year land in the 55–75°F range this site treats as mild.
How much Irmo's weather actually swings
Average temperatures in Irmo run from 42°F in Jan up to 79°F in Jul, a 37.7°F seasonal swing, a middling gap by national standards.
Irmo, month by month
| Month | Avg high | Avg low | Precip | Snow |
|---|---|---|---|---|
| Jan | 54°F | 29°F | 3.93in | 0.8in |
| Feb | 58°F | 31°F | 3.45in | 0in |
| Mar | 65°F | 37°F | 3.98in | 0in |
| Apr | 74°F | 45°F | 2.91in | 0in |
| May | 81°F | 55°F | 3.45in | 0in |
| Jun | 87°F | 64°F | 4.07in | 0in |
| Jul | 90°F | 68°F | 4.15in | 0in |
| Aug | 88°F | 68°F | 5.11in | 0in |
| Sep | 83°F | 60°F | 3.8in | 0in |
| Oct | 74°F | 47°F | 3.29in | 0in |
| Nov | 64°F | 36°F | 3.2in | 0in |
| Dec | 56°F | 31°F | 4.19in | 0in |
If you're timing a visit, Apr, May, Sep, and Oct are Irmo's mildest stretch; if you're moving there, you should plan around Jul's heat and Jan's cold instead.
How wet Irmo actually gets
Over a typical year, Irmo sees about 45.53in of precipitation a year across roughly 109 days with measurable rain or snow, with 0.8in of snow a year.
Irmo against the rest of the country
Out of 4876 cities scored here, Irmo comes in at 2722; within SC alone it ranks 55 of 66. Population is about 12,086.
Checking the actual forecast
These figures come from Cedar Creek 2e, SC US, the NOAA station 10.5 miles from Irmo, averaged over 30 years, not tomorrow's forecast.
More on how this is worked out
Why this uses the nearest NOAA station · How the comfort score is calculated