The best times to visit Irmo for ideal weather are

March 5th to May 27th

based on average temperature and humidity from NOAA (the National Oceanic and Atmospheric Administration). Read below for more weather and travel details.



Other Irmo Travel Info

Weather in Irmo


Average temperatures in Irmo vary greatly. Considering humidity, temperatures feel nice some of the year, but often too hot in the summer and cold in the winter with a fair chance of precipitation about half of the year. The area is less temperate than some — in the 25th percentile for pleasant weather — compared to tourist destinations worldwide. Weeks with ideal weather are listed above. If you’re looking for the very warmest time to visit Irmo, the hottest months are July, August, and then June. See average monthly temperatures below. The warmest time of year is generally late July where highs are regularly around 95.4°F (35.2°C) with temperatures rarely dropping below 72.4°F (22.4°C) at night.

Irmo Temperatures (Fahrenheit)


Irmo Temperatures (Celsius)


“Feels-Like” Temperatures

The way we experience weather isn’t all about temperature. Higher temperatures affect us much more at higher humidity, and colder temperatures feel piercing with high winds. Our perceived temperatures factor in humidity and wind chill to better represent how hot or cold the day feels to a person.

Irmo Perceived Temperature (F)


Irmo Perceived Temperature (C)



Average Irmo Temperatures by Month

Daily highs (averaged for the month) usually give the best indication of the weather. A significantly lower mean and low generally just means it gets colder at night.

Show Fahrenheit

Month Avg. High (°F) Avg. Mean (°F) Avg. Low (°F)
Jan 59.4 45.3 33
Feb 63 48.1 35.3
Mar 71.7 56.5 42.6
Apr 80 65.3 50.5
May 86.1 73 59.9
Jun 93.2 80.4 69.1
Jul 94.3 81.7 71.6
Aug 93.1 81 71.3
Sep 88.3 75.8 65.3
Oct 79.2 64.6 51.7
Nov 68.5 53.5 40.1
Dec 64.1 50.3 38.5

Show Celsius

Month Avg. High (°C) Avg. Mean (°C) Avg. Low (°C)
Jan 15.2 7.4 0.6
Feb 17.2 8.9 1.8
Mar 22.1 13.6 5.9
Apr 26.7 18.5 10.3
May 30.1 22.8 15.5
Jun 34 26.9 20.6
Jul 34.6 27.6 22
Aug 33.9 27.2 21.8
Sep 31.3 24.3 18.5
Oct 26.2 18.1 10.9
Nov 20.3 11.9 4.5
Dec 17.8 10.2 3.6



Precipitation (Rain or Snow)

If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Irmo are November, October, and then September. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around late May. For example, on the week of May 21st there is 1 day of precipitation on average. By contrast, it’s most likely to rain or snow in late December with an average of 3 days of significant precipitation the week of December 24th.

When can you find snow in Irmo? Weather stations report moderate or seasonal snow likely to be deepest around February, especially close to early to mid February. The best time to ski (if at all) in Irmo is often around around February 12th when fresh powder is deepest. Please note that a value of 0 for snow in the graph below may either mean there was no snow, or that snow is unreported.

Chance of Precipitation

The graph below shows the % chance of rainy and snowy days in Irmo.

Days with precipitation

Snow on the Ground

The graph below shows the average snow on the ground in Irmo (in).

Snow depth

Average Rain and Snow by Month

Show Inches

Month Daily Chance of Rain Average Snow Depth (in) Total Precipitation (in)
Jan 20% 1.7 2.5
Feb 25% 3.4 3.5
Mar 18% 0 3.6
Apr 18% 0 3.1
May 18% 0 3.1
Jun 23% 0 4.7
Jul 24% 0 5.2
Aug 22% 0 6.3
Sep 17% 0 3.1
Oct 15% 0 4.1
Nov 15% 0 2.9
Dec 23% 1.2 4.8

Show Centimeters

Month Daily Chance of Rain Average Snow Depth (cm) Total Precipitation (cm)
Jan 20 4.3 6.4
Feb 25 8.6 8.9
Mar 18 0 9.1
Apr 18 0 7.9
May 18 0 7.9
Jun 23 0 11.9
Jul 24 0 13.2
Aug 22 0 16
Sep 17 0 7.9
Oct 15 0 10.4
Nov 15 0 7.4
Dec 23 3 12.2


Humidity and Wind

Irmo has some slightly muggy months, with moderately humid months on the other side of the year. The least humid month is March (47.7% relative humidity), and the most humid month is August (61.7%).

Wind in Irmo is usually calm. The windiest month is April, followed by March and February. April’s average wind speed of around 6 knots (6.9 MPH or 11.1 KPH) is considered “a light breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in early April where average top sustained speeds reach 14.1 knots, which is considered a moderate breeze.

Relative Humidity (%)

The graph below shows the average % humidity by month in Irmo.

Avg. Relative Humidity


The graph below shows wind speed (max and average) in knots.

Max Sustained Wind
Average Daily Wind

Average Wind Speeds

Show Wind Speeds

All wind speeds are in knots. 1 knot = 1.15 MPH or 1.85 KPH.

Month Avg. Wind Avg. Wind Feel Sustained High Wind High Wind Feel
Jan 5.1 Light breeze 11.9 Significant breeze
Feb 5.6 Light breeze 12.9 Significant breeze
Mar 5.8 Light breeze 12.9 Significant breeze
Apr 6 Light breeze 13.3 Significant breeze
May 5.3 Light breeze 12.5 Significant breeze
Jun 4.8 Light breeze 12.7 Significant breeze
Jul 4.7 Light breeze 12.2 Significant breeze
Aug 4.1 Light breeze 10.9 Gentle breeze
Sep 4.2 Light breeze 9.9 Significant breeze
Oct 4.3 Light breeze 10.5 Gentle breeze
Nov 4.2 Light breeze 10 Significant breeze
Dec 4.4 Light breeze 10.9 Gentle breeze

Show Relative Humidity by Month

Month Avg. Relative Humidity
Jan 51.5%
Feb 47.9%
Mar 47.7%
Apr 47.8%
May 53.6%
Jun 55.7%
Jul 59.3%
Aug 61.7%
Sep 59.5%
Oct 58%
Nov 55.1%
Dec 59.5%


Is it Safe to Travel to Irmo?

Our best data indicates this area is generally safe. As of Oct 07, 2019 there are no travel advisories or warnings for the United States; exercise normal security precautions. Check this page for any recent changes or regions to avoid: Travel Advice and Advisories. This advisory was last updated on Sep 23, 2019.


The Busiest and Least Crowded Months

The busiest month for tourism in Irmo, SC, US is February, followed by June and July. Prices for hotels and flights will be most expensive during these months, though you can save if you purchase well in advance. Tourists are unlikely to visit Irmo in November. Those willing to visit at these times will likely find it the least expensive month.

Estimated Tourism by Month


Most Popular Months to Visit

Tourists Seeking Accommodations

Tourism graph is based on Google searches for services used by tourists relative to the rest of the year. Tourism data for this area is extrapolated based on nearby areas. Displayed data is calculated relative to the peak, so a score of 62.9 in November means 62.9% of the tourists vs. February.



Overall Irmo Travel Experience by Season

Spring (March through May)

Humidity and temperatures combine to make this season feel moderate. Highs range from 90°F (32.2°C) and 64.7°F (18.2°C) with warmer temperatures in the later months. Rain is somewhat common with 5 to 6 days of significant precipitation per month. Spring is fairly slow for tourism, which makes it a good time for those looking for deals.

Summer (June through August)

The middle-year months have very comfortable weather with high temperatures that are quite warm. These months see the most precipitation with 7 to 8 days of precipitation per month. June – August is the second busiest season for tourism in Irmo, so lodging and other accommodations may cost slightly more.

Fall (September through November)

Fall daily highs range from 92°F (33.3°C) and 65.9°F (18.8°C), which will feel comfortable given the humidity and wind. It rains or snows a significant amount: 4 to 5 days per month. Tourism is the slowest during these months due to the weather, so hotels may be affordably priced.

Winter (December through February)

Weather is too cold this time of year in Irmo to be enjoyable for warm weather travelers. The average high during this season is between 66°F (18.9°C) and 58.3°F (14.6°C). On average, it rains or snows a fair amount: 6 to 7 times per month. These times of year are the busiest with tourists.


Best Times to Travelthe United States › Irmo, SC, US