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May Weather in Sullivan, United States

Last updated: June 24, 2025

In May, the average temperature in Sullivan, United States hovers around 19°C (66°F), but you can expect a range that dips to a brisk 4°C (39°F) and peaks at a warm 33°C (92°F). With 165 mm (6.5 in) of precipitation spread over 15 days, staying dry may require some planning. Don't forget, the air carries a robust 82% humidity, so be prepared for that tropical feel!

May Temperature in Sullivan

In May in Sullivan, the average temperature is 19°C (66°F). Maximums can reach 33°C (92°F), while minimums can drop as low as 4°C (39°F). Be sure to pack a mix of clothing to enjoy both warm days and cooler nights during your travels!

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

The chart illustrates May temperature patterns in Sullivan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sullivan, May typically has an average temperature of 19°C (66°F), with highs reaching up to 33°C (92°F) and lows dropping to around 4°C (39°F).
JanFebMarAprMayJunJulAugSepOctNovDec333647556675797572594540
Data source: Temperature data for Sullivan 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 Sullivan

In Sullivan in May, the total precipitation amount is 165 mm (6.5 in) over a span of 15 days.

May Precipitation Trends in Sullivan

The chart displays monthly precipitation patterns in Sullivan, 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 Sullivan, May typically receives around 165 mm (6.5 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec768412813216587100127531076856
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Sullivan

In Sullivan in May humidity is 82%. With an average temperature of 19°C (66°F), this humidity feels like a warm blanket wrapping around you, making it slightly uncomfortable for traveling as you might find yourself constantly seeking shade or a cool breeze.

May Average Humidity in Sullivan

This chart illustrates the average monthly humidity levels in Sullivan, 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 Sullivan is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%80%80%80%82%83%81%80%76%76%85%86%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Sullivan

In Sullivan 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 Sullivan.

Maximum UV Index Levels in Sullivan for May

The chart shows the monthly maximum UV Index (UVI) for Sullivan 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 Sullivan typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3569101111109753
Data source: Sullivan 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 Sullivan Compares to Other Months

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

This table compares monthly weather conditions in Sullivan, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (33°F)76 mm (3.0 inches)82%moderate
February Weather2°C (36°F)84 mm (3.3 inches)80%moderate
March Weather8°C (48°F)128 mm (5.1 inches)80%high
April Weather13°C (55°F)132 mm (5.2 inches)80%very high
May Weather19°C (66°F)165 mm (6.5 inches)82%very high
June Weather24°C (76°F)87 mm (3.4 inches)83%extreme
July Weather26°C (79°F)100 mm (3.9 inches)81%extreme
August Weather24°C (76°F)126 mm (5.0 inches)80%very high
September Weather22°C (72°F)53 mm (2.1 inches)76%very high
October Weather15°C (59°F)107 mm (4.2 inches)76%high
November Weather7°C (45°F)68 mm (2.7 inches)85%moderate
December Weather4°C (40°F)56 mm (2.2 inches)86%moderate

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