October Weather in Saint John, United States

Last updated: June 24, 2025

In Saint John, United States, the average temperature in October hovers around 13°C (56°F). Expect a range that can dip to a brisk -1°C (31°F) and rise to a warm 30°C (86°F). During this month, you can anticipate approximately 142 mm (5.6 in) of rain spread over 14 days, contributing to an average humidity level of 82%. Prepare for a mix of cool and warm weather, along with some rainy days!

October Temperature in Saint John

In October in Saint John, the average temperature is 13°C (56°F). Maximum temperatures can reach 30°C (86°F), while minimums can drop as low as -1°C (31°F). Be prepared for a wide range of temperatures during 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 13°C (56°F), with highs reaching up to 30°C (86°F) and lows dropping to around -1°C (31°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 142 mm (5.6 in) occurring over a span of 14 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 142 mm (5.6 inches) of precipitation spread over approximately 14 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 82%. With an average temperature of 13°C (56°F), this humidity feels like a damp blanket wrapping around you, making it feel much cooler than it is and creating a heavy atmosphere that can be exhausting for travelers.

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 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 Saint John

In Saint John in October, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Saint John, you can refer to this 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 6, which falls under the high 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	-3°C (27°F)	70 mm (2.7 inches)	82%	moderate
February Weather	-2°C (29°F)	71 mm (2.8 inches)	83%	moderate
March Weather	4°C (39°F)	99 mm (3.9 inches)	84%	high
April Weather	9°C (48°F)	119 mm (4.7 inches)	85%	very high
May Weather	16°C (60°F)	162 mm (6.4 inches)	79%	very high
June Weather	22°C (71°F)	130 mm (5.1 inches)	82%	very high
July Weather	24°C (75°F)	103 mm (4.1 inches)	80%	very high
August Weather	23°C (73°F)	92 mm (3.6 inches)	81%	very high
September Weather	20°C (68°F)	74 mm (2.9 inches)	80%	very high
October Weather	13°C (56°F)	142 mm (5.6 inches)	82%	high
November Weather	5°C (40°F)	68 mm (2.7 inches)	88%	moderate
December Weather	1°C (34°F)	60 mm (2.4 inches)	84%	low