April Weather in St. Thomas, Canada

Last updated: June 18, 2025

In St. Thomas, Canada, the average temperature in April is a brisk 6°C (43°F), with a minimum dipping to -6°C (21°F) and a maximum reaching up to 20°C (68°F). Expect about 106 mm (4.2 in) of precipitation spread over 13 days, contributing to a high average humidity of 87%. Be prepared for a mix of chilly days and occasional dampness!

April Temperature in St. Thomas

In April in St. Thomas, the average temperature is 6°C (43°F), with maximums reaching up to 20°C (68°F) and minimums dropping as low as -6°C (21°F). Travelers should be prepared for a wide range of temperatures, making layered clothing essential for comfort during their visit.

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

The chart illustrates April 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, April typically has an average temperature of 6°C (43°F), with highs reaching up to 20°C (68°F) and lows dropping to around -6°C (21°F).

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

April Precipitation in St. Thomas

In St. Thomas in April, the precipitation amount is 106 mm (4.2 in) spread over a duration of 13 days.

April Precipitation Trends in St. Thomas

The chart displays monthly precipitation patterns in St. Thomas, with values for each month alongside April’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how April’s conditions compare to those of other months. In St. Thomas, April typically receives around 106 mm (4.2 inches) of precipitation spread over approximately 13 days.

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

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Millimeters (mm) Inches (in)

April Humidity in St. Thomas

In St. Thomas in April, humidity is 87%. With an average temperature of 6°C (43°F), this humidity feels like a damp chill that clings to your skin, making outdoor activities uncomfortable and necessitating warm, breathable layers for traveling.

April Average Humidity in St. Thomas

This chart illustrates the average monthly humidity levels in St. Thomas, with April’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In April, average humidity in St. Thomas is approximately 87%, offering insight into how humid the weather typically is during this month.

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

April UV Index in St. Thomas

In St. Thomas in April, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in St. Thomas.

Maximum UV Index Levels in St. Thomas for April

The chart shows the monthly maximum UV Index (UVI) for St. Thomas in April, 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 April, the maximum UV index in St. Thomas typically reaches 8, which falls under the very high exposure category.

Data source: St. Thomas April 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 April 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 April’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 April’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