June Weather in Ontario, United States

Last updated: June 24, 2025

The average temperature in Ontario, United States during June is a pleasant 23°C (73°F). Temperatures can vary significantly, with a minimum of 8°C (46°F) and soaring up to a maximum of 42°C (108°F). Visitors can expect 16 mm (0.6 in) of precipitation spread over 3 days, while the average humidity hovers around 71%.

June Temperature in Ontario

In June in Ontario, the average temperature is 23°C (73°F). Maximum temperatures can reach 42°C (108°F), while minimum temperatures can drop to as low as 8°C (46°F). Be prepared for a wide range of temperatures when traveling to Ontario during this month.

June Weather in Ontario: Daily Temperature Highs, Lows, and Averages

The chart illustrates June temperature patterns in Ontario, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ontario, June typically has an average temperature of 23°C (73°F), with highs reaching up to 42°C (108°F) and lows dropping to around 8°C (46°F).

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

June Precipitation in Ontario

In Ontario in June, the precipitation amount is 16 mm (0.6 in), spread over a duration of 3 days.

June Precipitation Trends in Ontario

The chart displays monthly precipitation patterns in Ontario, with values for each month alongside June’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how June’s conditions compare to those of other months. In Ontario, June typically receives around 16 mm (0.6 inches) of precipitation spread over approximately 3 days.

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

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Millimeters (mm) Inches (in)

June Humidity in Ontario

In Ontario in June humidity is 71%. With an average temperature of 23°C (73°F), this humidity feels like a warm, sticky embrace, making outdoor exploration slightly uncomfortable but still manageable if you stay hydrated and plan for breaks in shaded areas.

June Average Humidity in Ontario

This chart illustrates the average monthly humidity levels in Ontario, with June’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In June, average humidity in Ontario is approximately 71%, offering insight into how humid the weather typically is during this month.

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

June UV Index in Ontario

In Ontario in June, 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 Ontario.

Maximum UV Index Levels in Ontario for June

The chart shows the monthly maximum UV Index (UVI) for Ontario in June, 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 June, the maximum UV index in Ontario typically reaches 11, which falls under the extreme exposure category.

Data source: Ontario June 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 June Weather in Ontario Compares to Other Months

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

This table compares monthly weather conditions in Ontario, showing how June’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	0°C (33°F)	42 mm (1.7 inches)	88%	moderate
February Weather	2°C (36°F)	46 mm (1.8 inches)	89%	moderate
March Weather	8°C (47°F)	32 mm (1.3 inches)	85%	high
April Weather	12°C (55°F)	23 mm (0.9 inches)	79%	high
May Weather	17°C (64°F)	28 mm (1.1 inches)	71%	very high
June Weather	23°C (73°F)	16 mm (0.6 inches)	71%	extreme
July Weather	29°C (84°F)	1 mm (0.0 inches)	66%	very high
August Weather	27°C (82°F)	5 mm (0.2 inches)	50%	very high
September Weather	21°C (70°F)	10 mm (0.4 inches)	48%	very high
October Weather	12°C (55°F)	16 mm (0.6 inches)	65%	moderate
November Weather	6°C (43°F)	27 mm (1.1 inches)	84%	moderate
December Weather	1°C (35°F)	29 mm (1.1 inches)	87%	low