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May Weather in South Boston, United States

Last updated: June 24, 2025

In May, the average temperature in South Boston, United States is a pleasant 21°C (69°F), with temperatures ranging from a cool 2°C (36°F) to a scorching 36°C (98°F). Expect 110 mm (4.3 in) of precipitation spread over 11 days, contributing to an average humidity of 82%. Get ready for a month filled with diverse weather!

May Temperature in South Boston

In May in South Boston, the average temperature is 21°C (69°F). Maximum temperatures can reach 36°C (98°F), while minimums can drop as low as 2°C (36°F). This variability makes it essential for travelers to pack layers and be prepared for both warm and cooler weather conditions.

May Weather in South Boston: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in South Boston, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In South Boston, May typically has an average temperature of 21°C (69°F), with highs reaching up to 36°C (98°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec414651606976817873644945
Data source: Temperature data for South Boston 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 South Boston

In South Boston in May, the precipitation amount is 110 mm (4.3 in) spread over 11 days.

May Precipitation Trends in South Boston

The chart displays monthly precipitation patterns in South Boston, 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 South Boston, May typically receives around 110 mm (4.3 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec73108721201119269109981067596
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in South Boston

In South Boston in May humidity is 82%. With an average temperature of 21°C (69°F), this humidity feels like a sweltering embrace, making outdoor activities feel more strenuous and prompting travelers to seek shade and cooling breezes.

May Average Humidity in South Boston

This chart illustrates the average monthly humidity levels in South Boston, 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 South Boston is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%84%84%82%83%83%79%77%75%81%87%85%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in South Boston

In South Boston in May, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in South Boston.

Maximum UV Index Levels in South Boston for May

The chart shows the monthly maximum UV Index (UVI) for South Boston 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 South Boston typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3679111110109853
Data source: South Boston 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 South Boston Compares to Other Months

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

This table compares monthly weather conditions in South Boston, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (41°F)73 mm (2.9 inches)84%moderate
February Weather8°C (46°F)108 mm (4.2 inches)84%high
March Weather11°C (51°F)72 mm (2.8 inches)84%high
April Weather16°C (61°F)120 mm (4.7 inches)82%very high
May Weather21°C (69°F)110 mm (4.3 inches)82%extreme
June Weather24°C (76°F)92 mm (3.6 inches)83%extreme
July Weather27°C (81°F)69 mm (2.7 inches)79%very high
August Weather26°C (79°F)109 mm (4.3 inches)77%very high
September Weather23°C (74°F)98 mm (3.9 inches)75%very high
October Weather18°C (64°F)106 mm (4.2 inches)81%very high
November Weather10°C (50°F)75 mm (3.0 inches)87%moderate
December Weather7°C (45°F)96 mm (3.8 inches)85%moderate

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