Seneca, South Carolina Weather
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Climate of Seneca: monthly averages
Based on 25 years of satellite and reanalysis data (2001-2025), July is usually the hottest month in Seneca, with average daytime highs around 33°C. January is the coolest, when nights typically fall to about -1°C and frost is possible on the coldest nights. That is a wide yearly range of roughly 34°C, so the seasons feel very different from each other.
The area receives about 1380 mm of rain in a typical year. Most of it falls from all year (around 100% of the yearly total), and December is the wettest month at roughly 144 mm.
There is no long, mild season here; May usually comes closest to comfortable outdoor weather, with highs near 26°C.
| Month | Avg high | Avg low | Rainfall | Humidity |
|---|---|---|---|---|
| Jan | 10° | -1° | 114 mm | 82% |
| Feb | 12° | 1° | 117 mm | 82% |
| Mar | 17° | 5° | 118 mm | 80% |
| Apr | 22° | 9° | 106 mm | 78% |
| May | 26° | 14° | 112 mm | 77% |
| Jun | 31° | 19° | 116 mm | 73% |
| Jul | 33° | 20° | 124 mm | 71% |
| Aug | 32° | 20° | 117 mm | 71% |
| Sep | 29° | 16° | 107 mm | 72% |
| Oct | 23° | 10° | 100 mm | 73% |
| Nov | 16° | 4° | 108 mm | 75% |
| Dec | 12° | 1° | 144 mm | 82% |
Source: NASA POWER (MERRA-2 reanalysis), averaged over the roughly 50 km grid area around Seneca. Values describe typical conditions, not a forecast.
About Seneca weather
Seneca is set in South Carolina's humid subtropical climate, coastal and low-lying for much of the state, about 54 km west of Greenville. Summers bring hot, humid summers (June–August) with highs commonly in the low-to-mid 30s°C. The year winds down with mild winters (December–February), rarely dropping below freezing near the coast. This page shows live, auto-refreshing weather for Seneca: current conditions, an hourly breakdown, a 16-day outlook, a date-lookup tool for any past or future date, and real-time air quality, sourced from Open-Meteo. Local timezone: America/New_York.
Frequently asked questions
Seneca is about 54 km west of Greenville, in South Carolina.
Seneca sees mild winters (December–February), rarely dropping below freezing near the coast.
The live current conditions, hourly forecast and 16-day outlook above are pulled in real time for Seneca's exact coordinates. No fixed schedule, the page updates whenever you load it.
July is usually the hottest month in Seneca, with average daytime highs of about 33°C and nights around 20°C.
The coldest nights come in January, when the average low is about -1°C and daytime highs reach around 10°C. Frost is possible on clear, calm nights.
Seneca receives about 1380 mm of rain in a typical year. December is the wettest month at roughly 144 mm, and the main rainy period is all year.
There is no long mild season in Seneca. May usually comes closest to comfortable outdoor weather.
In November Seneca typically sees daytime highs near 16°C and lows near 4°C, with about 108 mm of rain over the month and average humidity around 75%. Check the live forecast above for this week's actual conditions.
Up to 16 days ahead using the extended forecast and date picker above; further-out or historical dates use the same date lookup tool.
Live temperature for Seneca is shown at the top of this page and refreshes automatically — see the hourly breakdown below for how it changes through the day.
Seneca's day-to-day weather follows the broader pattern of South Carolina described above. See the hourly weather forecast or the air quality index for more detail.