Weather in Sumter

Planning your day in the city of Sumter? Check out the most up-to-date weather information, including detailed forecasts and graphs presented below.

The climate in Sumter can be described as humid subtropical, making it attractive to visit at almost any time of the year. Warm weather prevails here with long hot summers and short, very mild winters. Extreme cold is a rarity here, so the city is perfect for those who prefer to avoid harsh frosts and snowdrifts.

The summer months, especially July and August, are characterised by high temperatures, reaching an average of 32°C during the day. This period also sees the peak of rainy days (up to 19 days with precipitation in July), often manifesting as short but intense summer thunderstorms. Winter passes calmly: the average temperature in January holds at 9°C, and night-time figures rarely drop below 4°C.

The transitional seasons — spring and autumn — are considered the most comfortable for walks and sightseeing. In spring, the air warms up quickly, reaching a pleasant 23–24°C by May. Autumn brings long-awaited freshness after the summer heat, with October standing out as one of the most favourable months: the temperature holds around 20°C, and the number of rainy days drops to a minimum.

The climate in Sumter is characterised by distinct seasonality, offering travellers a variety of temperature regimes throughout the year. The coldest month is traditionally January, when the average temperature is about 9.2°C, and night-time values can drop to 4.4°C. Its opposite is July — the hottest month of the year, when average figures reach 27.9°C, and the daytime heat regularly exceeds the 32°C mark.

The summer period here is long and truly hot. Already from May, daytime highs approach 28.5°C, and from June to August, they stay consistently above 30°C. Summer nights do not bring strong cooling: the temperature after dark rarely drops below 21-23°C, creating the atmosphere of a warm southern evening. Winter, on the other hand, is quite mild. Even in the coldest months (December and January), the air warms up to a comfortable 14-15°C during the day, making this season pleasant for excursions without extreme frosts.

Travellers should also take into account noticeable temperature fluctuations between day and night, which are characteristic of Sumter all year round. The difference between the daily maximum and nightly minimum averages about 10-12 degrees. This is especially evident in the off-season: for example, in April or October, after a warm day with temperatures around 24-25°C, a rather fresh evening may set in, when the thermometer drops to 12-15°C, so having a light jacket in your luggage will not be amiss.

Precipitation in Sumter falls throughout the year, but its intensity and frequency vary noticeably depending on the season. Travellers should be prepared for the fact that the weather here can be changeable, especially in the warm months. There is no distinct "dry season" as such, but there are periods when the likelihood of rain is significantly lower.

The wettest time of the year is summer. The peak of precipitation falls on July, when the highest number of rainy days is recorded — about 19 per month. August is not far behind with a figure of 17 days with precipitation. During this period, rains often take the character of warm summer downpours, which can be short-lived but quite frequent.

If you prefer drier weather for walks, it is best to plan a trip for mid-autumn or spring. Statistically, the driest month is October, when the number of days with precipitation drops to 7. April and November are also distinguished by a relatively low probability of rain (about 8 days a month), which makes them comfortable for sightseeing.

In winter, from December to February, precipitation falls moderately often — on average 10–11 days a month. Since temperatures during this period rarely drop below freezing (the average minimum in January is about +4.4°C), precipitation falls mainly in the form of rain. Snowfalls in Sumter are possible but are a rare exception rather than the rule.

When packing for Sumter, it is important to consider the peculiarities of the local climate: summers here are hot and quite humid, while winters are mild but cool. For a trip in the summer months (especially in July and August, when the number of rainy days reaches a maximum), be sure to take light clothing made of natural breathable fabrics, such as cotton or linen. Given the high probability of precipitation, a compact umbrella or a light raincoat should definitely be in your suitcase, as well as reliable sun protection and a hat to protect against the heat.

If your trip is planned for the winter period or the off-season, the principle of layering in clothing will be the best solution. In winter, the temperature at night can drop to 4–6°C, while during the day the air warms up to a comfortable 14–17°C. It is recommended to bring warm sweaters, jeans, and a mid-season jacket that can be easily removed when it gets warmer. In spring and autumn, the weather is most pleasant for walks, but a light windbreaker will come in handy, as evenings can be fresh.

Regardless of the time of year, for sightseeing in Sumter, you will need comfortable and practical walking shoes. Since light rains are possible in any month (on average from 8 to 11 days with precipitation), it is worth choosing shoes that are water-resistant, or having a spare pair with you. Such a thoughtful approach to packing baggage will allow you to feel comfortable and enjoy the trip in any weather.