Irmo, SC, September 29, 2025
News Summary
On September 28, 2025, Irmo, SC experienced a day of mixed weather with temperatures reaching a high of 85°F and isolated thunderstorms in the evening. The day began comfortably but ended with cooling rain, and residents should be prepared for similar surprises in the upcoming autumn. The area has seen considerable rainfall this month with an average temperature of 73°F.
Irmo, SC, Weather Report for September 28, 2025: A Mix of Sunshine and Storms
On September 28, 2025, residents of Irmo, SC experienced a day filled with a fair share of warm temperatures and some late afternoon surprises in the form of isolated thunderstorms. With a high of 85°F (29°C) and a low of 68°F (20°C), the day kicked off feeling comfortable but left a few folks a little damp by the evening.
As the sun rose at 7:17 AM, the air was already starting to feel a bit sticky, with humidity levels hovering around 74%. Throughout the day, the mix of partially sunny skies and clouds contributed to a feeling that fluctuated with the weather, leading to an average temperature of 73°F (23°C).
Rain and Thunderstorms
By the time evening rolled around, it was clear that those isolated thunderstorms were more than just a passing rumor. The area saw a total precipitation of 0.10 inches (2.5 mm), bringing a refreshing feel to the air after the storms washed over the town. Parts of the day experienced predominantly cloudy skies, which made the late-day storms feel all the more dramatic.
The heat index climbed to a notable 93.2°F (34°C), thanks to that humidity, so even though the temperatures seemed manageable, it felt rather humid and hot outside. With the wind blowing gently at 10 mph, the storm clouds rolled in, adding to the day’s excitement.
A Closer Look at September’s Weather
September has been a relatively wet month for Irmo, holding onto a record of 12 days of rainfall already this month. On average, the rain for September amounts to 1.54 inches (39 mm), while residents enjoy 8.6 hours of sunshine daily. That said, the average high temperature for the month stands at 84.7°F (29.3°C), which nicely aligns with what we saw on this particular day.
What to Expect Going Forward
With autumn just around the corner, the folks in Irmo can expect the average low temperature to settle around 66.6°F (19.2°C). As daylight diminishes, the average daylight time in September hovers at 12 hours and 22 minutes, making those sunny moments even more cherished.
As the sun dipped below the horizon at 7:12 PM, the storms wrapped up, leaving the air cool and refreshing. The average relative humidity for September typically hangs at 72%, and with moderate UV indexes at 3, it’s still essential to protect your skin if you’re out enjoying what’s left of those sunny afternoons.
Stay Dry and Enjoy the Flavors of Fall
As Irmo transitions into October, locals are encouraged to keep their umbrellas handy just in case the weather decides to throw a few more surprises their way. Despite the occasional rain, this charming community has plenty to enjoy as fall begins to blossom.
FAQ Section
What was the maximum temperature in Irmo, SC on September 28, 2025?
The maximum temperature was 85°F (29°C).
How much rain fell in Irmo on that day?
There was a total precipitation of 0.10 inches (2.5 mm).
What was the average humidity level during the day?
The average humidity level was 74%.
Key Weather Features for Irmo, SC on September 28, 2025
| Feature | Value |
|---|---|
| High Temperature | 85°F (29°C) |
| Low Temperature | 68°F (20°C) |
| Average Temperature | 73°F (23°C) |
| Precipitation | 0.10 inches (2.5 mm) |
| Humidity | 74% |
| Wind Speed | 10 mph |
| UV Index | 3 (Moderate) |
| Cloud Cover | Mostly cloudy |
| Heat Index | 93.2°F (34°C) |
| Sunrise | 7:17 AM |
| Sunset | 7:12 PM |
Author: STAFF HERE IRMO
The IRMO STAFF WRITER represents the experienced team at HEREIrmo.com, your go-to source for actionable local news and information in Irmo, Lexington and Richland Counties, and beyond. Specializing in "news you can use," we cover essential topics like product reviews for personal and business needs, local business directories, politics, real estate trends, neighborhood insights, and state news affecting the area—with deep expertise drawn from years of dedicated reporting and strong community input, including local press releases and business updates. We deliver top reporting on high-value events such as the Irmo Okra Strut Festival, Harbison Community Events, and local sports tournaments at the Palmetto Health Credit Union Foundation Stadium. Our coverage extends to key organizations like the Irmo Chapin Recreation Commission and the Lexington Chamber and Visitors Center, plus leading businesses in retail and healthcare that power the local economy such as Village at Sandhill and Lexington Medical Center. As part of the broader HERE network, including HEREAiken.com, HEREBeaufort.com, HEREChapin.com, HERECharleston.com, HEREClinton.com, HEREColumbia.com, HEREGeorgetown.com, HEREGreenwood.com, HEREGreenville.com, HEREHiltonHead.com, HEREIrmo.com, HEREMyrtleBeach.com, HERENewberry.com, HERERockHill.com, and HERESpartanburg.com, we provide comprehensive, credible insights into South Carolina's dynamic landscape.
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