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May Weather in Dorchester, United States

Last updated: June 24, 2025

In May, the average temperature in Dorchester, United States is a comfortable 17°C (63°F). However, temperatures can vary significantly, with a minimum of 2°C (36°F) and a sweltering maximum of 38°C (100°F). Expect a fair amount of rain, with 145 mm (5.7 in) of precipitation spread over 14 days. Humidity levels are typically high, averaging around 78%, adding to the overall atmosphere of the region.

May Temperature in Dorchester

In May in Dorchester, the average temperature is 17°C (63°F). Maximum temperatures can reach 38°C (100°F), while minimums can drop to as low as 2°C (36°F). This makes Dorchester a great destination for travelers seeking a diverse climate, so be sure to pack accordingly!

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

The chart illustrates May temperature patterns in Dorchester, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Dorchester, May typically has an average temperature of 17°C (63°F), with highs reaching up to 38°C (100°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec272742516377797570534133
Data source: Temperature data for Dorchester 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 Dorchester

In Dorchester in May, the total precipitation amount is 145 mm (5.7 in) over a span of 14 days.

May Precipitation Trends in Dorchester

The chart displays monthly precipitation patterns in Dorchester, 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 Dorchester, May typically receives around 145 mm (5.7 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec32269547145976582811102740
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Dorchester

In Dorchester in May, humidity is 78%. With an average temperature of 17°C (63°F), this humidity feels like a warm, enveloping blanket, making traveling slightly uncomfortable as you navigate the sticky air, prompting the need for frequent breaks in cooler, shaded areas.

May Average Humidity in Dorchester

This chart illustrates the average monthly humidity levels in Dorchester, 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 Dorchester is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%80%73%75%78%82%83%81%75%75%82%83%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Dorchester

In Dorchester 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 Dorchester.

Maximum UV Index Levels in Dorchester for May

The chart shows the monthly maximum UV Index (UVI) for Dorchester 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 Dorchester typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910111098643
Data source: Dorchester 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 Dorchester Compares to Other Months

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

This table compares monthly weather conditions in Dorchester, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)32 mm (1.3 inches)76%moderate
February Weather-3°C (27°F)26 mm (1.0 inches)80%moderate
March Weather6°C (42°F)95 mm (3.7 inches)73%high
April Weather11°C (51°F)47 mm (1.8 inches)74%very high
May Weather17°C (63°F)145 mm (5.7 inches)78%very high
June Weather25°C (77°F)97 mm (3.8 inches)82%extreme
July Weather26°C (79°F)64 mm (2.5 inches)83%very high
August Weather24°C (76°F)82 mm (3.2 inches)80%very high
September Weather21°C (70°F)81 mm (3.2 inches)75%very high
October Weather12°C (53°F)110 mm (4.3 inches)75%high
November Weather5°C (41°F)27 mm (1.1 inches)82%moderate
December Weather0°C (33°F)40 mm (1.6 inches)83%moderate

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