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September Weather in Hartsville, United States

Last updated: June 24, 2025

In September, the average temperature in Hartsville, United States is a pleasant 23°C (74°F). Expect a minimum of 8°C (47°F) and a maximum soaring to 36°C (97°F). With an average humidity of 71%, it can feel quite warm. Be prepared for some rain, as 120 mm (4.7 in) of precipitation is likely over 8 days.

September Temperature in Hartsville

In September in Hartsville, the average temperature is 23°C (74°F). The maximum can reach 36°C (97°F) and the minimum can be as low as 8°C (47°F). This makes it an ideal destination for travelers seeking warm weather, but be prepared for cooler evenings.

September Weather in Hartsville: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Hartsville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hartsville, September typically has an average temperature of 23°C (74°F), with highs reaching up to 36°C (97°F) and lows dropping to around 8°C (47°F).
JanFebMarAprMayJunJulAugSepOctNovDec404452597076807873634845
Data source: Temperature data for Hartsville generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Hartsville

In Hartsville in September, the total precipitation amount reaches 120 mm (4.7 in) over the course of 8 days.

September Precipitation Trends in Hartsville

The chart displays monthly precipitation patterns in Hartsville, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Hartsville, September typically receives around 120 mm (4.7 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec10618715714511914912211812014288151
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Hartsville

In Hartsville in September, humidity is 71%. With an average temperature of 23°C (74°F), this humidity feels like a warm, enveloping embrace that can make outdoor activities feel sticky, but if you're well-hydrated and take breaks in the shade, it offers a pleasant tropical ambiance perfect for exploration.

September Average Humidity in Hartsville

This chart illustrates the average monthly humidity levels in Hartsville, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Hartsville is approximately 71%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%86%86%82%83%83%80%74%71%78%88%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Hartsville

In Hartsville in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Hartsville.

Maximum UV Index Levels in Hartsville for September

The chart shows the monthly maximum UV Index (UVI) for Hartsville in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Hartsville typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36710101111109753
Data source: Hartsville September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Hartsville Compares to Other Months

Weather in Hartsville varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Hartsville, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Hartsville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (40°F)106 mm (4.2 inches)87%moderate
February Weather7°C (45°F)187 mm (7.4 inches)86%high
March Weather11°C (52°F)157 mm (6.2 inches)86%high
April Weather15°C (59°F)145 mm (5.7 inches)82%very high
May Weather21°C (70°F)119 mm (4.7 inches)82%very high
June Weather24°C (76°F)149 mm (5.9 inches)83%extreme
July Weather27°C (80°F)122 mm (4.8 inches)80%extreme
August Weather25°C (78°F)118 mm (4.7 inches)74%very high
September Weather23°C (74°F)120 mm (4.7 inches)71%very high
October Weather17°C (63°F)141 mm (5.6 inches)78%high
November Weather9°C (48°F)88 mm (3.5 inches)88%moderate
December Weather7°C (45°F)151 mm (6.0 inches)88%moderate

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