May Weather in Montclair, United States

Last updated: June 24, 2025

In May, the average temperature in Montclair, United States hovers around 20°C (67°F), offering a pleasant climate for outdoor activities. However, temperatures can swing from a brisk 3°C (38°F) to a scorching 35°C (95°F), so dress accordingly! Expect approximately 117 mm (4.6 in) of rainfall spread over 12 days, contributing to an average humidity of 78%. Prepare for a month of varied weather experiences!

May Temperature in Montclair

In May in Montclair, the average temperature is 20°C (67°F). Maximums can reach 35°C (95°F), and minimums can be as low as 3°C (38°F). Pack accordingly to enjoy a range of weather conditions while traveling!

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

The chart illustrates May temperature patterns in Montclair, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Montclair, May typically has an average temperature of 20°C (67°F), with highs reaching up to 35°C (95°F) and lows dropping to around 3°C (38°F).

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

May Precipitation in Montclair

In Montclair in May, the total precipitation amount is 117 mm (4.6 in), occurring over a span of 12 days.

May Precipitation Trends in Montclair

The chart displays monthly precipitation patterns in Montclair, 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 Montclair, May typically receives around 117 mm (4.6 inches) of precipitation spread over approximately 12 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 Montclair

In Montclair in May humidity is 78%. With an average temperature of 20°C (67°F), this humidity feels like walking through a warm, thick blanket, making travel a bit sticky and requiring frequent breaks to find shade and cool refreshments.

May Average Humidity in Montclair

This chart illustrates the average monthly humidity levels in Montclair, 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 Montclair is approximately 78%, 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 Montclair

In Montclair 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 Montclair.

Maximum UV Index Levels in Montclair for May

The chart shows the monthly maximum UV Index (UVI) for Montclair 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 Montclair typically reaches 10, which falls under the very high exposure category.

Data source: Montclair 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 Montclair Compares to Other Months

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

This table compares monthly weather conditions in Montclair, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	3°C (38°F)	61 mm (2.4 inches)	84%	moderate
February Weather	6°C (43°F)	93 mm (3.6 inches)	83%	moderate
March Weather	9°C (48°F)	79 mm (3.1 inches)	83%	high
April Weather	14°C (58°F)	101 mm (4.0 inches)	81%	very high
May Weather	20°C (67°F)	117 mm (4.6 inches)	78%	very high
June Weather	24°C (76°F)	108 mm (4.3 inches)	79%	very high
July Weather	27°C (81°F)	108 mm (4.2 inches)	74%	very high
August Weather	26°C (78°F)	153 mm (6.0 inches)	72%	very high
September Weather	23°C (73°F)	93 mm (3.6 inches)	75%	very high
October Weather	17°C (63°F)	109 mm (4.3 inches)	81%	high
November Weather	9°C (49°F)	78 mm (3.1 inches)	85%	moderate
December Weather	6°C (42°F)	89 mm (3.5 inches)	84%	moderate