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), providing a comfortable climate. However, temperatures can fluctuate, with a minimum of 0°C (33°F) and soaring to a maximum of 34°C (93°F). Expect 127 mm (5.0 in) of precipitation spread over approximately 14 days, while the air remains quite humid with an average humidity of 74%. Embrace the season's variety!

May Temperature in Hartford

In May in Hartford, the average temperature is 15°C (59°F). Maximum temperatures can reach as high as 34°C (93°F), while minimums can drop to as low as 0°C (33°F). This varied climate makes Hartford an ideal destination for travelers seeking diverse weather experiences.

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 34°C (93°F) and lows dropping to around 0°C (33°F).

Data source: Temperature data for Hartford generated using information from the Copernicus Climate Change Service.

May Precipitation in Hartford

In Hartford in May, the total precipitation amount is 127 mm (5.0 in), occurring over the course of 14 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 127 mm (5.0 inches) of precipitation spread over approximately 14 days.

Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

May Humidity in Hartford

In Hartford in May, humidity is 74%. With an average temperature of 15°C (59°F), this humidity feels like traveling through a warm, sticky blanket that clings to your skin, making outdoor activities a bit uncomfortable and prompting you to seek out shaded areas or cool breezes.

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 74%, offering insight into how humid the weather typically is during this month.

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.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	-7°C (20°F)	20 mm (0.8 inches)	80%	low
February Weather	-7°C (20°F)	23 mm (0.9 inches)	84%	moderate
March Weather	2°C (35°F)	65 mm (2.5 inches)	75%	moderate
April Weather	7°C (45°F)	80 mm (3.2 inches)	79%	very high
May Weather	15°C (59°F)	127 mm (5.0 inches)	74%	very high
June Weather	23°C (73°F)	83 mm (3.3 inches)	81%	extreme
July Weather	24°C (76°F)	81 mm (3.2 inches)	82%	very high
August Weather	22°C (72°F)	95 mm (3.7 inches)	80%	very high
September Weather	18°C (66°F)	102 mm (4.0 inches)	75%	very high
October Weather	9°C (48°F)	77 mm (3.1 inches)	77%	moderate
November Weather	1°C (35°F)	24 mm (1.0 inches)	85%	moderate
December Weather	-3°C (26°F)	39 mm (1.5 inches)	83%	low