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May Weather in Hartford, United States

Last updated: June 24, 2025

In Hartford, United States, the average temperature in May hovers around 21°C (70°F), with minimums reaching 3°C (38°F) and maximums soaring up to 35°C (95°F). Expect about 126 mm (5.0 in) of precipitation spread over 12 days, contributing to an average humidity of 82%. Get ready for a month of warmth mixed with potential showers!

May Temperature in Hartford

In May in Hartford, the average temperature is 21°C (70°F). Maximums can reach 35°C (95°F) and minimums can be as low as 3°C (38°F). Be prepared for warm days and cool evenings while enjoying your travels!

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 21°C (70°F), with highs reaching up to 35°C (95°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec374150586976807873624643
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 126 mm (5.0 in) over the course of 12 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 126 mm (5.0 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec931501291491261251039210311593106
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 82%. With an average temperature of 21°C (70°F), this humidity feels like a warm, sticky embrace that can quickly lead to discomfort for travelers, making outdoor activities less enjoyable and requiring frequent breaks for hydration.

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 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%86%86%82%83%83%80%74%71%78%88%88%
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 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 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 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36710101110109753
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 Weather3°C (37°F)93 mm (3.7 inches)87%moderate
February Weather5°C (42°F)150 mm (5.9 inches)86%high
March Weather10°C (50°F)129 mm (5.1 inches)86%high
April Weather14°C (58°F)149 mm (5.9 inches)82%very high
May Weather21°C (70°F)126 mm (5.0 inches)82%very high
June Weather25°C (77°F)125 mm (4.9 inches)83%extreme
July Weather27°C (80°F)103 mm (4.1 inches)80%very high
August Weather25°C (78°F)92 mm (3.6 inches)74%very high
September Weather23°C (73°F)103 mm (4.1 inches)71%very high
October Weather17°C (62°F)115 mm (4.5 inches)78%high
November Weather8°C (47°F)93 mm (3.7 inches)88%moderate
December Weather6°C (43°F)106 mm (4.2 inches)88%moderate

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