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May Weather in Hyannis, United States

Last updated: June 24, 2025

In Hyannis, United States, the average temperature in May hovers around 13°C (55°F), with a minimum of -7°C (20°F) and a maximum reaching up to 32°C (91°F). Expect 136 mm (5.4 in) of precipitation spread over 14 days, coupled with an average humidity of 76%. Be prepared for a mix of weather as you explore this vibrant locale!

May Temperature in Hyannis

In May in Hyannis, the average temperature is 13°C (55°F). Maximum temperatures can reach 32°C (91°F), while minimums can drop as low as -7°C (20°F). Travelers should be prepared for a wide range of temperatures when visiting during this month.

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

The chart illustrates May temperature patterns in Hyannis, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hyannis, May typically has an average temperature of 13°C (55°F), with highs reaching up to 32°C (91°F) and lows dropping to around -7°C (20°F).
JanFebMarAprMayJunJulAugSepOctNovDec272437445569747164463830
Data source: Temperature data for Hyannis 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 Hyannis

In Hyannis in May, the precipitation amount is 136 mm (5.4 in) over a span of 14 days.

May Precipitation Trends in Hyannis

The chart displays monthly precipitation patterns in Hyannis, 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 Hyannis, May typically receives around 136 mm (5.4 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec1424634913656635846362221
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Hyannis

In Hyannis in May humidity is 76%. With an average temperature of 13°C (55°F), this humidity feels like a damp, heavy blanket enveloping you, making it feel cooler than it actually is, which can be quite refreshing for short excursions but may also lead to discomfort during prolonged outdoor activities.

May Average Humidity in Hyannis

This chart illustrates the average monthly humidity levels in Hyannis, 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 Hyannis is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec73%80%64%64%76%79%77%79%70%64%75%78%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Hyannis

In Hyannis 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 Hyannis.

Maximum UV Index Levels in Hyannis for May

The chart shows the monthly maximum UV Index (UVI) for Hyannis 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 Hyannis typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3568101111109643
Data source: Hyannis 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 Hyannis Compares to Other Months

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

This table compares monthly weather conditions in Hyannis, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)14 mm (0.5 inches)73%moderate
February Weather-4°C (25°F)24 mm (0.9 inches)80%moderate
March Weather3°C (38°F)63 mm (2.5 inches)64%high
April Weather7°C (44°F)49 mm (1.9 inches)64%very high
May Weather13°C (55°F)136 mm (5.4 inches)76%very high
June Weather21°C (70°F)56 mm (2.2 inches)79%extreme
July Weather23°C (74°F)63 mm (2.5 inches)77%extreme
August Weather21°C (71°F)58 mm (2.3 inches)79%very high
September Weather18°C (65°F)46 mm (1.8 inches)70%very high
October Weather8°C (46°F)36 mm (1.4 inches)64%high
November Weather3°C (38°F)22 mm (0.9 inches)75%moderate
December Weather-1°C (30°F)21 mm (0.8 inches)78%moderate

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