July Weather in St. Thomas, Canada

Last updated: June 18, 2025

In July, the average temperature in St. Thomas, Canada hovers around 22°C (72°F), with the minimum dipping to 14°C (57°F) and the maximum reaching a balmy 31°C (87°F). Expect some rain, with 91 mm (3.6 in) of precipitation over 12 days. Don't forget, the average humidity is a comfortable 79%, making it a delightful time to experience all that St. Thomas has to offer!

July Temperature in St. Thomas

In July in St. Thomas, the average temperature is 22°C (72°F), with maximums reaching 31°C (87°F) and minimums dropping as low as 14°C (57°F). This pleasant weather makes it an ideal time for travel and outdoor activities.

July Weather in St. Thomas: Daily Temperature Highs, Lows, and Averages

The chart illustrates July temperature patterns in St. Thomas, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In St. Thomas, July typically has an average temperature of 22°C (72°F), with highs reaching up to 31°C (87°F) and lows dropping to around 14°C (57°F).

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

July Precipitation in St. Thomas

In St. Thomas in July, the precipitation amount is 91 mm (3.6 in) over a period of 12 days.

July Precipitation Trends in St. Thomas

The chart displays monthly precipitation patterns in St. Thomas, 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 St. Thomas, July typically receives around 91 mm (3.6 inches) of precipitation spread over approximately 12 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 St. Thomas

In St. Thomas in July humidity is 79%. With an average temperature of 22°C (72°F), this humidity feels like you are enveloped in a warm, heavy blanket, making it feel considerably hotter and adding a layer of stickiness to your skin as you navigate through the streets.

July Average Humidity in St. Thomas

This chart illustrates the average monthly humidity levels in St. Thomas, 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 St. Thomas is approximately 79%, 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 St. Thomas

In St. Thomas in July, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in St. Thomas.

Maximum UV Index Levels in St. Thomas for July

The chart shows the monthly maximum UV Index (UVI) for St. Thomas 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 St. Thomas typically reaches 10, which falls under the very high exposure category.

Data source: St. Thomas 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 St. Thomas Compares to Other Months

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

This table compares monthly weather conditions in St. Thomas, showing how July’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-3°C (27°F)	76 mm (3.0 inches)	90%	moderate
February Weather	-3°C (27°F)	79 mm (3.1 inches)	90%	moderate
March Weather	1°C (34°F)	81 mm (3.2 inches)	87%	moderate
April Weather	6°C (43°F)	106 mm (4.2 inches)	87%	very high
May Weather	13°C (55°F)	99 mm (3.9 inches)	82%	very high
June Weather	19°C (66°F)	93 mm (3.7 inches)	81%	very high
July Weather	22°C (72°F)	91 mm (3.6 inches)	79%	very high
August Weather	22°C (71°F)	96 mm (3.8 inches)	80%	very high
September Weather	18°C (65°F)	82 mm (3.2 inches)	81%	very high
October Weather	12°C (55°F)	123 mm (4.9 inches)	84%	high
November Weather	5°C (41°F)	94 mm (3.7 inches)	88%	moderate
December Weather	1°C (34°F)	77 mm (3.0 inches)	87%	low