July Weather in Saint John, United States

Last updated: June 24, 2025

In July, the average temperature in Saint John, United States hovers around 27°C (81°F). However, be prepared for a range, with minimums dipping to 14°C (58°F) and maximums soaring up to 41°C (105°F). This month sees about 58 mm (2.3 in) of precipitation spread over 8 days, while average humidity sits comfortably at 81%. Stay hydrated and enjoy the warmth!

July Temperature in Saint John

In July in Saint John, the average temperature is 27°C (81°F). Maximums can reach 41°C (105°F), while minimums can drop to as low as 14°C (58°F). It’s advisable to pack for both warm days and cooler nights when traveling during this month.

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

The chart illustrates July 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, July typically has an average temperature of 27°C (81°F), with highs reaching up to 41°C (105°F) and lows dropping to around 14°C (58°F).

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

July Precipitation in Saint John

In Saint John in July, the precipitation amount is 58 mm (2.3 in) over a span of 8 days.

July Precipitation Trends in Saint John

The chart displays monthly precipitation patterns in Saint John, 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 Saint John, July typically receives around 58 mm (2.3 inches) of precipitation spread over approximately 8 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

July Humidity in Saint John

In Saint John in July humidity is 81%. With an average temperature of 27°C (81°F), this humidity feels like a warm, heavy blanket enveloping you, making travel quite uncomfortable as it can quickly drain your energy and require frequent hydration breaks.

July Average Humidity in Saint John

This chart illustrates the average monthly humidity levels in Saint John, 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 Saint John is approximately 81%, 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 Saint John

In Saint John in July, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Saint John.

Maximum UV Index Levels in Saint John for July

The chart shows the monthly maximum UV Index (UVI) for Saint John 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 Saint John typically reaches 11, which falls under the extreme exposure category.

Data source: Saint John 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 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 July’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 July’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	0°C (33°F)	25 mm (1.0 inches)	75%	moderate
February Weather	1°C (34°F)	21 mm (0.8 inches)	76%	moderate
March Weather	8°C (47°F)	68 mm (2.7 inches)	67%	high
April Weather	12°C (54°F)	50 mm (2.0 inches)	70%	very high
May Weather	18°C (65°F)	168 mm (6.6 inches)	82%	very high
June Weather	25°C (77°F)	62 mm (2.4 inches)	82%	extreme
July Weather	27°C (81°F)	58 mm (2.3 inches)	81%	extreme
August Weather	25°C (78°F)	74 mm (2.9 inches)	76%	very high
September Weather	23°C (73°F)	62 mm (2.4 inches)	67%	very high
October Weather	14°C (57°F)	81 mm (3.2 inches)	72%	high
November Weather	7°C (45°F)	24 mm (0.9 inches)	80%	moderate
December Weather	3°C (37°F)	32 mm (1.3 inches)	83%	moderate