May Weather in Islesboro, United States

Last updated: June 24, 2025

In Islesboro, United States, the average temperature in May hovers around 9°C (49°F), with a comfortable maximum reaching up to 19°C (66°F) and a chilly minimum plunging to 2°C (36°F). Expect 114 mm (4.5 in) of precipitation spread over 12 days, contributing to an average humidity level of 76%. Ideal for those who enjoy a refreshing, cooler climate!

May Temperature in Islesboro

In May in Islesboro, the average temperature is 9°C (49°F). Maximum temperatures can reach 19°C (66°F), while the minimum can drop as low as 2°C (36°F). It's a great time for travelers to experience mild weather and enjoy outdoor activities in Islesboro.

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

The chart illustrates May temperature patterns in Islesboro, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Islesboro, May typically has an average temperature of 9°C (49°F), with highs reaching up to 19°C (66°F) and lows dropping to around 2°C (36°F).

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

May Precipitation in Islesboro

In Islesboro in May, the precipitation amount is 114 mm (4.5 in) spread over 12 days.

May Precipitation Trends in Islesboro

The chart displays monthly precipitation patterns in Islesboro, 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 Islesboro, May typically receives around 114 mm (4.5 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 Islesboro

In Islesboro in May, humidity is 76%. With an average temperature of 9°C (49°F), this humidity feels like a chilly embrace, making outdoor adventures a bit uncomfortable as the dampness seeps into your clothes and lingers in the air, often leading to a sense of coolness that can be refreshing but also dampens the joy of exploration.

May Average Humidity in Islesboro

This chart illustrates the average monthly humidity levels in Islesboro, 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 Islesboro is approximately 76%, 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 Islesboro

In Islesboro 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 Islesboro.

Maximum UV Index Levels in Islesboro for May

The chart shows the monthly maximum UV Index (UVI) for Islesboro 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 Islesboro typically reaches 9, which falls under the very high exposure category.

Data source: Islesboro 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 Islesboro Compares to Other Months

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

This table compares monthly weather conditions in Islesboro, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-2°C (28°F)	112 mm (4.4 inches)	88%	low
February Weather	-2°C (29°F)	108 mm (4.2 inches)	88%	moderate
March Weather	0°C (33°F)	89 mm (3.5 inches)	85%	moderate
April Weather	5°C (41°F)	169 mm (6.7 inches)	81%	high
May Weather	9°C (49°F)	114 mm (4.5 inches)	76%	very high
June Weather	14°C (58°F)	87 mm (3.4 inches)	74%	very high
July Weather	17°C (63°F)	100 mm (3.9 inches)	74%	very high
August Weather	18°C (65°F)	90 mm (3.5 inches)	74%	very high
September Weather	16°C (61°F)	99 mm (3.9 inches)	77%	high
October Weather	12°C (54°F)	169 mm (6.6 inches)	82%	moderate
November Weather	6°C (42°F)	145 mm (5.7 inches)	85%	moderate
December Weather	0°C (33°F)	160 mm (6.3 inches)	84%	low