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May Weather in Hartford, United States

Last updated: June 24, 2025

In May, the average temperature in Hartford, United States hovers around 15°C (59°F). Expect a wide range of temperatures, where the minimum can dip to -1°C (30°F) and the maximum can soar to 35°C (95°F). Be prepared for some wet days, as 122 mm (4.8 in) of precipitation is expected over 13 days, and the air will feel quite humid with an average humidity of 78%.

May Temperature in Hartford

In May in Hartford, the average temperature is 15°C (59°F). Maximum temperatures can reach 35°C (95°F), while minimums can drop as low as -1°C (30°F). It's advisable to pack for a wide range of weather conditions to fully enjoy your travels in this diverse climate.

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

The chart illustrates May temperature patterns in Hartford, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hartford, May typically has an average temperature of 15°C (59°F), with highs reaching up to 35°C (95°F) and lows dropping to around -1°C (30°F).
JanFebMarAprMayJunJulAugSepOctNovDec212336455970747165513629
Data source: Temperature data for Hartford 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 Hartford

In Hartford in May, the precipitation amount is 122 mm (4.8 in) recorded over a span of 13 days.

May Precipitation Trends in Hartford

The chart displays monthly precipitation patterns in Hartford, 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 Hartford, May typically receives around 122 mm (4.8 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec53495910612211110591941154545
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Hartford

In Hartford in May, humidity is 78%. With an average temperature of 15°C (59°F), this humidity feels like a warm, enveloping blanket that clings to your skin, making outdoor activities a bit more tiring and requiring frequent breaks for hydration as you explore the area.

May Average Humidity in Hartford

This chart illustrates the average monthly humidity levels in Hartford, 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 Hartford is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%85%85%85%78%80%78%76%79%83%88%82%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Hartford

In Hartford in May, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Hartford.

Maximum UV Index Levels in Hartford for May

The chart shows the monthly maximum UV Index (UVI) for Hartford 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 Hartford typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34589101097532
Data source: Hartford 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 Hartford Compares to Other Months

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

This table compares monthly weather conditions in Hartford, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (22°F)53 mm (2.1 inches)85%moderate
February Weather-5°C (23°F)49 mm (1.9 inches)85%moderate
March Weather2°C (36°F)59 mm (2.3 inches)85%moderate
April Weather7°C (46°F)106 mm (4.2 inches)85%very high
May Weather15°C (59°F)122 mm (4.8 inches)78%very high
June Weather21°C (70°F)111 mm (4.4 inches)80%very high
July Weather23°C (74°F)105 mm (4.1 inches)78%very high
August Weather22°C (71°F)91 mm (3.6 inches)76%very high
September Weather18°C (65°F)94 mm (3.7 inches)79%high
October Weather11°C (52°F)115 mm (4.5 inches)83%moderate
November Weather2°C (37°F)44 mm (1.8 inches)88%moderate
December Weather-1°C (30°F)45 mm (1.8 inches)81%low

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