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May Weather in Grafton, United States

Last updated: June 24, 2025

In May, the average temperature in Grafton, United States hovers around 17°C (63°F). This month can bring a temperature range from a chilly -2°C (28°F) to a balmy 30°C (86°F). Expect 160 mm (6.3 in) of rain over about 18 days, contributing to an average humidity of 82%. Be prepared for a mix of weather as you explore!

May Temperature in Grafton

In May in Grafton, the average temperature is 17°C (63°F), with maximums reaching up to 30°C (86°F) and minimums dropping as low as -2°C (28°F). This diverse range of temperatures makes it essential for travelers to pack accordingly for both warm and chilly conditions.

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 17°C (63°F), with highs reaching up to 30°C (86°F) and lows dropping to around -2°C (28°F).
JanFebMarAprMayJunJulAugSepOctNovDec333843526369737267574338
Data source: Temperature data for Grafton 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 Grafton

In Grafton in May, the precipitation amount is 160 mm (6.3 in) spread across 18 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 160 mm (6.3 inches) of precipitation spread over approximately 18 days.
JanFebMarAprMayJunJulAugSepOctNovDec10215912215216014511511411312089134
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Grafton

In Grafton in May, humidity is 82%. With an average temperature of 17°C (63°F), this humidity feels like a warm blanket wrapping around you—comfortable yet heavy, making outdoor activities more taxing and requiring frequent breaks for hydration.

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 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%88%87%82%84%82%73%74%81%89%86%
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 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 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 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101010108753
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.
 TemperaturePrecipitationHumidityUV
January Weather0°C (33°F)102 mm (4.0 inches)88%moderate
February Weather3°C (38°F)159 mm (6.2 inches)88%moderate
March Weather6°C (44°F)122 mm (4.8 inches)88%high
April Weather11°C (53°F)152 mm (6.0 inches)86%very high
May Weather17°C (63°F)160 mm (6.3 inches)82%very high
June Weather20°C (69°F)145 mm (5.7 inches)84%very high
July Weather23°C (74°F)115 mm (4.5 inches)82%very high
August Weather22°C (72°F)114 mm (4.5 inches)73%very high
September Weather19°C (67°F)113 mm (4.5 inches)73%very high
October Weather14°C (58°F)120 mm (4.7 inches)81%high
November Weather6°C (43°F)89 mm (3.5 inches)89%moderate
December Weather3°C (38°F)134 mm (5.3 inches)86%moderate

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