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July Weather in Ontario, United States

Last updated: June 24, 2025

In July, the average temperature in Ontario, United States hovers around 22°C (72°F), making it a pleasantly warm month. Expect a minimum of 12°C (55°F) and a maximum soaring to 31°C (88°F). However, prepare for some rain, as the area typically experiences 149 mm (5.9 in) of precipitation over 13 days, contributing to an average humidity of 78%.

July Temperature in Ontario

In July in Ontario, the average temperature is 22°C (72°F), with maximums reaching up to 31°C (88°F) and minimums dropping as low as 12°C (55°F). This pleasant climate makes it an ideal destination for travelers looking to enjoy mild weather and outdoor activities.

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

The chart illustrates July 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, July typically has an average temperature of 22°C (72°F), with highs reaching up to 31°C (88°F) and lows dropping to around 12°C (55°F).
JanFebMarAprMayJunJulAugSepOctNovDec283035445364727266554134
Data source: Temperature data for Ontario generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

July Precipitation in Ontario

In Ontario in July, the precipitation amount is 149 mm (5.9 in) spread over 13 days.

July Precipitation Trends in Ontario

The chart displays monthly precipitation patterns in Ontario, 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 Ontario, July typically receives around 149 mm (5.9 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec9494851241108014910383164110113
Data source: Precipitation data for July generated using information from the Copernicus Climate Change Service.
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July Humidity in Ontario

In Ontario in July, humidity is 78%. With an average temperature of 22°C (72°F), this humidity feels like a warm blanket wrapped around you, making outdoor exploration a bit stifling but ultimately rewarding as you bask in the vibrant atmosphere.

July Average Humidity in Ontario

This chart illustrates the average monthly humidity levels in Ontario, 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 Ontario is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%90%87%88%82%79%78%76%78%84%89%86%
Data source: Humidity data for July generated using information from the Copernicus Climate Change Service.

July UV Index in Ontario

In Ontario in July, 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 Ontario.

Maximum UV Index Levels in Ontario for July

The chart shows the monthly maximum UV Index (UVI) for Ontario 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 Ontario typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24681010997532
Data source: Ontario 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 Ontario Compares to Other Months

Weather in Ontario varies notably across the year, with each month offering distinct climate conditions. This page compares July’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 July’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)94 mm (3.7 inches)90%low
February Weather-1°C (30°F)94 mm (3.7 inches)90%moderate
March Weather2°C (35°F)85 mm (3.3 inches)87%high
April Weather6°C (44°F)124 mm (4.9 inches)88%very high
May Weather12°C (54°F)110 mm (4.3 inches)82%very high
June Weather18°C (64°F)80 mm (3.1 inches)79%very high
July Weather22°C (72°F)149 mm (5.9 inches)78%very high
August Weather22°C (72°F)103 mm (4.1 inches)76%very high
September Weather19°C (66°F)83 mm (3.3 inches)78%high
October Weather13°C (56°F)164 mm (6.5 inches)84%moderate
November Weather5°C (42°F)110 mm (4.3 inches)89%moderate
December Weather1°C (34°F)113 mm (4.4 inches)86%low

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