May Weather in Niagara, United States

Last updated: June 24, 2025

In May, the average temperature in Niagara, United States hovers around 12°C (55°F). However, be prepared for a range of temperatures, with a chilly minimum of -3°C (27°F) and a sizzling maximum of 34°C (93°F). Expect about 85 mm (3.3 in) of precipitation spread over 11 days, complemented by an average humidity of 77%.

May Temperature in Niagara

In May in Niagara, the average temperature is 12°C (55°F), with maximums reaching 34°C (93°F) and minimums dropping as low as -3°C (27°F). Travelers should be prepared for a wide range of temperatures, making layering essential for comfort during their visit.

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

The chart illustrates May temperature patterns in Niagara, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Niagara, May typically has an average temperature of 12°C (55°F), with highs reaching up to 34°C (93°F) and lows dropping to around -3°C (27°F).

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

May Precipitation in Niagara

In Niagara in May, the total precipitation amount is 85 mm (3.3 in) over a span of 11 days.

May Precipitation Trends in Niagara

The chart displays monthly precipitation patterns in Niagara, 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 Niagara, May typically receives around 85 mm (3.3 inches) of precipitation spread over approximately 11 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 Niagara

In Niagara in May humidity is 77%. With an average temperature of 12°C (55°F), this humidity feels like an enveloping dampness that can make outdoor activities a bit uncomfortable, causing travelers to feel slightly sticky and less energized.

May Average Humidity in Niagara

This chart illustrates the average monthly humidity levels in Niagara, 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 Niagara is approximately 77%, 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 Niagara

In Niagara 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 Niagara.

Maximum UV Index Levels in Niagara for May

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

Data source: Niagara 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 Niagara Compares to Other Months

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

This table compares monthly weather conditions in Niagara, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-8°C (17°F)	33 mm (1.3 inches)	89%	low
February Weather	-9°C (17°F)	49 mm (1.9 inches)	90%	moderate
March Weather	-2°C (28°F)	48 mm (1.9 inches)	87%	moderate
April Weather	4°C (39°F)	90 mm (3.5 inches)	84%	high
May Weather	12°C (55°F)	85 mm (3.3 inches)	77%	very high
June Weather	18°C (65°F)	108 mm (4.3 inches)	75%	very high
July Weather	21°C (70°F)	103 mm (4.1 inches)	74%	very high
August Weather	19°C (67°F)	118 mm (4.6 inches)	73%	very high
September Weather	15°C (60°F)	90 mm (3.5 inches)	78%	high
October Weather	8°C (46°F)	99 mm (3.9 inches)	84%	moderate
November Weather	0°C (32°F)	51 mm (2.0 inches)	89%	moderate
December Weather	-5°C (23°F)	55 mm (2.2 inches)	87%	low