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May Weather in Stony Brook, United States

Last updated: June 24, 2025

In May, the average temperature in Stony Brook, United States hovers around 15°C (60°F). However, temperatures can vary significantly, with a minimum of 2°C (36°F) and a maximum reaching up to 31°C (87°F). Expect 110 mm (4.3 in) of precipitation spread over 12 days, coupled with an average humidity of 69%. Stay prepared for varying weather as you enjoy your time in this vibrant destination!

May Temperature in Stony Brook

In May in Stony Brook, the average temperature is 15°C (60°F). Maximums can reach 31°C (87°F), while minimums can be as low as 2°C (36°F). It's a great time to visit Stony Brook if you enjoy mild weather with a chance of warmer days!

May Weather in Stony Brook: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Stony Brook, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Stony Brook, May typically has an average temperature of 15°C (60°F), with highs reaching up to 31°C (87°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec343641505970777569604739
Data source: Temperature data for Stony Brook 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 Stony Brook

In Stony Brook in May, the precipitation amount is 110 mm (4.3 in) over a span of 12 days.

May Precipitation Trends in Stony Brook

The chart displays monthly precipitation patterns in Stony Brook, 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 Stony Brook, May typically receives around 110 mm (4.3 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec709995119110901321089212994119
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Stony Brook

In Stony Brook in May, humidity is 69%. With an average temperature of 15°C (60°F), this humidity feels like a cool, damp embrace that can make outdoor activities feel slightly heavier and more exhausting, but still inviting for exploring the charming sights and sounds of the area.

May Average Humidity in Stony Brook

This chart illustrates the average monthly humidity levels in Stony Brook, 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 Stony Brook is approximately 69%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%81%78%70%69%62%65%68%74%82%80%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Stony Brook

In Stony Brook 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 Stony Brook.

Maximum UV Index Levels in Stony Brook for May

The chart shows the monthly maximum UV Index (UVI) for Stony Brook 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 Stony Brook typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35681010998642
Data source: Stony Brook 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 Stony Brook Compares to Other Months

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

This table compares monthly weather conditions in Stony Brook, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)70 mm (2.8 inches)84%moderate
February Weather2°C (36°F)99 mm (3.9 inches)82%moderate
March Weather5°C (41°F)95 mm (3.8 inches)81%high
April Weather10°C (50°F)118 mm (4.7 inches)78%very high
May Weather15°C (60°F)110 mm (4.3 inches)69%very high
June Weather21°C (70°F)90 mm (3.5 inches)69%very high
July Weather25°C (77°F)132 mm (5.2 inches)62%very high
August Weather24°C (75°F)108 mm (4.3 inches)65%very high
September Weather21°C (69°F)92 mm (3.6 inches)68%very high
October Weather15°C (60°F)129 mm (5.1 inches)74%high
November Weather8°C (47°F)94 mm (3.7 inches)82%moderate
December Weather4°C (39°F)119 mm (4.7 inches)80%low

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