October Weather in Southwest Harbor, United States

Last updated: June 24, 2025

In Southwest Harbor, United States, the average temperature in October hovers around 12°C (54°F), with daily highs reaching up to 18°C (64°F) and lows dipping to a chilly 2°C (36°F). Expect 119 mm (4.7 in) of precipitation spread over 11 days, contributing to an average humidity level of 82%. Stay prepared for a mix of cool breezes and occasional rain!

October Temperature in Southwest Harbor

In October in Southwest Harbor, the average temperature is 12°C (54°F). Maximum temperatures can reach 18°C (64°F), while minimums can drop to as low as 2°C (36°F). Pack layers and be prepared for cool days and chilly evenings during your travels.

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

The chart illustrates October 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, October typically has an average temperature of 12°C (54°F), with highs reaching up to 18°C (64°F) and lows dropping to around 2°C (36°F).

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

October Precipitation in Southwest Harbor

In Southwest Harbor in October, the total precipitation amount is 119 mm (4.7 in), which occurs over the course of 11 days.

October Precipitation Trends in Southwest Harbor

The chart displays monthly precipitation patterns in Southwest Harbor, with values for each month alongside October’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how October’s conditions compare to those of other months. In Southwest Harbor, October typically receives around 119 mm (4.7 inches) of precipitation spread over approximately 11 days.

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

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Millimeters (mm) Inches (in)

October Humidity in Southwest Harbor

In Southwest Harbor in October humidity is 82%. With an average temperature of 12°C (54°F), this humidity feels like a heavy blanket wrapping around you, making every step feel sluggish and sweat-inducing, which can be quite uncomfortable for traveling.

October Average Humidity in Southwest Harbor

This chart illustrates the average monthly humidity levels in Southwest Harbor, with October’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In October, average humidity in Southwest Harbor is approximately 82%, offering insight into how humid the weather typically is during this month.

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

October UV Index in Southwest Harbor

In Southwest Harbor in October, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Southwest Harbor.

Maximum UV Index Levels in Southwest Harbor for October

The chart shows the monthly maximum UV Index (UVI) for Southwest Harbor in October, 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 October, the maximum UV index in Southwest Harbor typically reaches 5, which falls under the moderate exposure category.

Data source: Southwest Harbor October 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 October 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 October’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 October’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