July Weather in Southwest Harbor, United States

Last updated: June 24, 2025

In Southwest Harbor, United States, the average temperature in July hovers around 15°C (59°F), with lows dipping to 12°C (53°F) and highs reaching 20°C (69°F). Expect about 82 mm (3.2 in) of precipitation over approximately 10 days, contributing to an average humidity of 74%. Embrace the refreshing climate as you explore this vibrant destination!

July Temperature in Southwest Harbor

In July in Southwest Harbor, the average temperature is 15°C (59°F). Maximum temperatures can reach 20°C (69°F), while the minimum can drop to as low as 12°C (53°F). This mild climate makes Southwest Harbor an ideal destination for travelers seeking comfortable weather.

July Weather in Southwest Harbor: Daily Temperature Highs, Lows, and Averages

The chart illustrates July temperature patterns in Southwest Harbor, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Southwest Harbor, July typically has an average temperature of 15°C (59°F), with highs reaching up to 20°C (69°F) and lows dropping to around 12°C (53°F).

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

July Precipitation in Southwest Harbor

In Southwest Harbor in July, the total precipitation amount is 82 mm (3.2 in) observed over a span of 10 days.

July Precipitation Trends in Southwest Harbor

The chart displays monthly precipitation patterns in Southwest Harbor, with values for each month alongside July’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how July’s conditions compare to those of other months. In Southwest Harbor, July typically receives around 82 mm (3.2 inches) of precipitation spread over approximately 10 days.

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

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Millimeters (mm) Inches (in)

July Humidity in Southwest Harbor

In Southwest Harbor in July, humidity is 74%. With an average temperature of 15°C (59°F), this humidity feels like traveling through a warm, sticky blanket that clings to your skin, making outdoor activities a bit uncomfortable and prompting you to seek out shaded areas or cool breezes.

July Average Humidity in Southwest Harbor

This chart illustrates the average monthly humidity levels in Southwest Harbor, with July’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In July, average humidity in Southwest Harbor is approximately 74%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for July generated using information from the Copernicus Climate Change Service.

July UV Index in Southwest Harbor

In Southwest Harbor in July, 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 Southwest Harbor.

Maximum UV Index Levels in Southwest Harbor for July

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

Data source: Southwest Harbor July 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 July Weather in Southwest Harbor Compares to Other Months

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

This table compares monthly weather conditions in Southwest Harbor, showing how July’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-1°C (30°F)	113 mm (4.4 inches)	88%	low
February Weather	-1°C (31°F)	107 mm (4.2 inches)	88%	moderate
March Weather	1°C (34°F)	83 mm (3.3 inches)	85%	moderate
April Weather	5°C (41°F)	143 mm (5.6 inches)	81%	high
May Weather	8°C (48°F)	105 mm (4.1 inches)	76%	very high
June Weather	12°C (54°F)	95 mm (3.7 inches)	74%	very high
July Weather	15°C (59°F)	82 mm (3.2 inches)	74%	very high
August Weather	16°C (62°F)	87 mm (3.4 inches)	74%	very high
September Weather	15°C (59°F)	105 mm (4.2 inches)	77%	high
October Weather	12°C (54°F)	119 mm (4.7 inches)	82%	moderate
November Weather	6°C (44°F)	139 mm (5.5 inches)	85%	moderate
December Weather	1°C (35°F)	154 mm (6.1 inches)	84%	low