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May Weather in Sullivan, United States

Last updated: June 24, 2025

In Sullivan, United States, the average temperature for May is a mild 19°C (66°F). However, temperatures can vary widely, with minimums dipping to 1°C (34°F) and maximums soaring up to 35°C (95°F). This month also sees an average precipitation of 138 mm (5.4 in) spread across 14 days, accompanied by a high average humidity of 80%. Whether you're braving the heat or enjoying the rain, there's plenty to experience!

May Temperature in Sullivan

In May in Sullivan, the average temperature is 19°C (66°F). The maximum can reach 35°C (95°F), and the minimum can be as low as 1°C (34°F). This range makes it a versatile destination for travelers, allowing for both warm afternoons and cool evenings.

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 35°C (95°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec303344536675787471584237
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 138 mm (5.4 in) over a span of 14 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 138 mm (5.4 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec7979127125138108116128691238964
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 80%. With an average temperature of 19°C (66°F), this humidity feels like a warm, thick blanket wrapping around you, making outdoor activities feel more strenuous and sticky, which can ultimately dampen the experience of traveling.

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 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%84%83%80%83%82%83%79%79%88%87%
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.
JanFebMarAprMayJunJulAugSepOctNovDec356910111098643
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 Weather-1°C (30°F)79 mm (3.1 inches)84%moderate
February Weather0°C (33°F)79 mm (3.1 inches)82%moderate
March Weather7°C (44°F)127 mm (5.0 inches)84%high
April Weather12°C (53°F)125 mm (4.9 inches)83%very high
May Weather19°C (66°F)138 mm (5.4 inches)80%very high
June Weather24°C (76°F)108 mm (4.2 inches)83%extreme
July Weather25°C (78°F)116 mm (4.6 inches)82%very high
August Weather24°C (75°F)128 mm (5.0 inches)82%very high
September Weather22°C (71°F)69 mm (2.7 inches)79%very high
October Weather14°C (58°F)123 mm (4.8 inches)79%high
November Weather6°C (42°F)89 mm (3.5 inches)88%moderate
December Weather3°C (37°F)64 mm (2.5 inches)87%moderate

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