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May Weather in Hartsville, United States

Last updated: June 24, 2025

The average temperature in Hartsville, United States during May is a pleasant 21°C (70°F). However, be prepared for temperature fluctuations, with a minimum of 3°C (38°F) and a maximum of 34°C (93°F). Expect some rain too, as the area receives an average of 119 mm (4.7 in) of precipitation over 13 days. With an average humidity of 82%, it’s a month that combines warmth with a touch of moisture.

May Temperature in Hartsville

In May, in Hartsville, the average temperature is 21°C (70°F). Maximum temperatures can reach as high as 34°C (93°F) while minimums can drop to a chilly 3°C (38°F). This diverse climate makes Hartsville an ideal destination for travelers seeking both warm and cool weather experiences.

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

The chart illustrates May 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, May typically has an average temperature of 21°C (70°F), with highs reaching up to 34°C (93°F) and lows dropping to around 3°C (38°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.

May Precipitation in Hartsville

In Hartsville in May, the precipitation amount is 119 mm (4.7 in) spread over 13 days.

May Precipitation Trends in Hartsville

The chart displays monthly precipitation patterns in Hartsville, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Hartsville, May typically receives around 119 mm (4.7 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec10618715714511914912211812014288151
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Hartsville

In Hartsville in May, humidity is 82%. With an average temperature of 21°C (70°F), this humidity feels like a warm, sticky embrace that can quickly lead to discomfort for travelers, making outdoor activities less enjoyable and requiring frequent breaks for hydration.

May Average Humidity in Hartsville

This chart illustrates the average monthly humidity levels in Hartsville, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Hartsville is approximately 82%, 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 May generated using information from the Copernicus Climate Change Service.

May UV Index in Hartsville

In Hartsville in May, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Hartsville.

Maximum UV Index Levels in Hartsville for May

The chart shows the monthly maximum UV Index (UVI) for Hartsville in May, 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 May, the maximum UV index in Hartsville typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36710101111109753
Data source: Hartsville May 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 May 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 May’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 May’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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