October Weather in Saint John, United States

Last updated: June 24, 2025

In October, the average temperature in Saint John, United States hovers around 10°C (50°F). Expect a wide range, with minimums dipping to -11°C (12°F) and highs reaching up to 28°C (82°F). The month also brings about 54 mm (2.1 in) of precipitation over 9 days, contributing to an average humidity of 80%.

October Temperature in Saint John

In October in Saint John, the average temperature is 10°C (50°F). Maximum temperatures can reach 28°C (82°F), while minimums can drop to as low as -11°C (12°F). Be prepared for a wide range of weather conditions, making it advisable to pack layers for your travels.

October Weather in Saint John: Daily Temperature Highs, Lows, and Averages

The chart illustrates October temperature patterns in Saint John, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Saint John, October typically has an average temperature of 10°C (50°F), with highs reaching up to 28°C (82°F) and lows dropping to around -11°C (12°F).

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

October Precipitation in Saint John

In Saint John in October, the precipitation amount is 54 mm (2.1 in) over a span of 9 days.

October Precipitation Trends in Saint John

The chart displays monthly precipitation patterns in Saint John, 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 Saint John, October typically receives around 54 mm (2.1 inches) of precipitation spread over approximately 9 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

October Humidity in Saint John

In Saint John in October, humidity is 80%. With an average temperature of 10°C (50°F), this humidity feels like a damp chill enveloping you, making traveling somewhat uncomfortable as it seeps into your clothes and clings to your skin, leaving you longing for a cozy indoor refuge.

October Average Humidity in Saint John

This chart illustrates the average monthly humidity levels in Saint John, 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 Saint John is approximately 80%, 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 Saint John

In Saint John 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 Saint John.

Maximum UV Index Levels in Saint John for October

The chart shows the monthly maximum UV Index (UVI) for Saint John 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 Saint John typically reaches 5, which falls under the moderate exposure category.

Data source: Saint John 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 Saint John Compares to Other Months

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

This table compares monthly weather conditions in Saint John, 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 (35°F)	62 mm (2.5 inches)	85%	low
February Weather	1°C (34°F)	74 mm (2.9 inches)	86%	moderate
March Weather	6°C (42°F)	56 mm (2.2 inches)	86%	moderate
April Weather	10°C (50°F)	48 mm (1.9 inches)	82%	high
May Weather	15°C (59°F)	45 mm (1.8 inches)	77%	very high
June Weather	20°C (68°F)	20 mm (0.8 inches)	79%	very high
July Weather	24°C (76°F)	2 mm (0.1 inches)	77%	very high
August Weather	24°C (75°F)	10 mm (0.4 inches)	62%	very high
September Weather	18°C (64°F)	22 mm (0.9 inches)	60%	high
October Weather	10°C (50°F)	54 mm (2.1 inches)	80%	moderate
November Weather	5°C (41°F)	74 mm (2.9 inches)	87%	moderate
December Weather	1°C (34°F)	70 mm (2.8 inches)	86%	low