August Weather in Saint John, United States

Last updated: June 24, 2025

In August, the average temperature in Saint John, United States hovers around 23°C (73°F). Expect a pleasant range, with minimums dipping to 11°C (53°F) and maximums reaching up to 34°C (94°F). Rainfall is moderate, with 92 mm (3.6 in) of precipitation spread over 11 days, contributing to an average humidity of 81%. Perfect for those who enjoy a warm and slightly humid climate!

August Temperature in Saint John

In August in Saint John, the average temperature is 23°C (73°F), with maximums reaching up to 34°C (94°F) and minimums dropping as low as 11°C (53°F). Travelers should pack for a range of temperatures and enjoy a warm, pleasant climate.

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

The chart illustrates August 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, August typically has an average temperature of 23°C (73°F), with highs reaching up to 34°C (94°F) and lows dropping to around 11°C (53°F).

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

August Precipitation in Saint John

In Saint John in August, the precipitation amount is 92 mm (3.6 in) spread over 11 days.

August Precipitation Trends in Saint John

The chart displays monthly precipitation patterns in Saint John, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In Saint John, August typically receives around 92 mm (3.6 inches) of precipitation spread over approximately 11 days.

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

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Millimeters (mm) Inches (in)

August Humidity in Saint John

In Saint John in August, humidity is 81%. With an average temperature of 23°C (73°F), this humidity feels like a heavy blanket wrapping around you, making every step feel more laborious while traveling and causing you to constantly seek out shade or a cool breeze for relief.

August Average Humidity in Saint John

This chart illustrates the average monthly humidity levels in Saint John, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in Saint John is approximately 81%, offering insight into how humid the weather typically is during this month.

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

August UV Index in Saint John

In Saint John in August, 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 Saint John.

Maximum UV Index Levels in Saint John for August

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

Data source: Saint John August 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 August 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 August’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 August’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