May Weather in Grafton, United States

Last updated: June 24, 2025

In Grafton, United States, the average temperature in May hovers around 13°C (55°F). However, you can expect a range, with minima dipping as low as -5°C (23°F) and maxima soaring up to 32°C (91°F). This month also sees 48 mm (1.9 in) of precipitation over roughly 7 days, complemented by an average humidity of 74%. Stay prepared for a varied climate!

May Temperature in Grafton

In May in Grafton, the average temperature is 13°C (55°F). Maximum temperatures can reach 32°C (91°F), while minimum temperatures can drop to as low as -5°C (23°F). This diverse range of temperatures makes Grafton a destination that requires packing for both warm days and chilly evenings.

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

The chart illustrates May temperature patterns in Grafton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grafton, May typically has an average temperature of 13°C (55°F), with highs reaching up to 32°C (91°F) and lows dropping to around -5°C (23°F).

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

May Precipitation in Grafton

In Grafton in May, the total precipitation amount is 48 mm (1.9 in) over a span of 7 days.

May Precipitation Trends in Grafton

The chart displays monthly precipitation patterns in Grafton, 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 Grafton, May typically receives around 48 mm (1.9 inches) of precipitation spread over approximately 7 days.

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

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Millimeters (mm) Inches (in)

May Humidity in Grafton

In Grafton in May, humidity is 74%. With an average temperature of 13°C (55°F), this humidity feels like a damp blanket wrapping around you, making outdoor activities somewhat uncomfortable and demanding frequent breaks in shaded areas.

May Average Humidity in Grafton

This chart illustrates the average monthly humidity levels in Grafton, 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 Grafton 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 Grafton

In Grafton in May, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Grafton.

Maximum UV Index Levels in Grafton for May

The chart shows the monthly maximum UV Index (UVI) for Grafton 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 Grafton typically reaches 8, which falls under the very high exposure category.

Data source: Grafton 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 Grafton Compares to Other Months

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

This table compares monthly weather conditions in Grafton, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-13°C (9°F)	17 mm (0.6 inches)	92%	low
February Weather	-14°C (7°F)	18 mm (0.7 inches)	90%	moderate
March Weather	-4°C (25°F)	22 mm (0.9 inches)	88%	moderate
April Weather	3°C (38°F)	27 mm (1.1 inches)	81%	high
May Weather	13°C (55°F)	48 mm (1.9 inches)	74%	very high
June Weather	20°C (68°F)	64 mm (2.5 inches)	72%	very high
July Weather	22°C (72°F)	54 mm (2.1 inches)	74%	very high
August Weather	20°C (68°F)	63 mm (2.5 inches)	76%	very high
September Weather	15°C (59°F)	82 mm (3.2 inches)	73%	high
October Weather	6°C (43°F)	79 mm (3.1 inches)	76%	moderate
November Weather	-3°C (26°F)	26 mm (1.0 inches)	86%	moderate
December Weather	-9°C (16°F)	30 mm (1.2 inches)	91%	low