Contents
- Weather in July
- Frequently asked questions
- Average temperature in July
- Average pressure in July
- Average wind speed in July
- Average humidity in July
- Average rainfall in July
- Average rainfall days in July
- Average snowfall days in July
- Average daylight in July
- Average sunshine in July
- Average sunshine days in July
- Average UV index in July
- Average cloud cover in July
- Average visibility in July
Weather in July
Temperature
The shift from June to July sees a slight increase in the average high-temperature, transitioning from a warm 84°F (28.9°C) to a hot 90°F (32.2°C). Ontario's nights in July are distinguished by a pronounced temperature shift from the day, with an average low of 64.8°F (18.2°C).Heat index
July's average heat index is appraised at a hot 93.2°F (34°C). More preventive actions are needed, risk of heat exhaustion and heat cramps is significant. Prolonged activity may trigger heatstroke.Bear in mind that the heat index values are determined for shaded areas and light breezes. Exposure to unobstructed sunshine could lead to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', is found by incorporating humidity levels into the air temperature measurement. The impact of weather is individual, with diverse individuals experiencing it differently due to variations in body mass, height, and activity levels. Always consider that direct sunlight exposure might heighten the heat's effects, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Young children typically face greater hazards than adults because they do not sweat as much. Their larger skin surface in comparison to their little bodies and the high heat production from their active nature compounds their vulnerability.
Humidity
In Ontario, the average relative humidity in July is 45%.Rainfall
In Ontario, in July, during 2.8 rainfall days, 0.16" (4mm) of precipitation is typically accumulated. Throughout the year, there are 49.6 rainfall days, and 7.8" (198mm) of precipitation is accumulated.Snowfall
January, March through December are months without snowfall.Daylight
The average length of the day in July is 14h and 10min.On the first day of the month, sunrise is at 5:43 am and sunset at 8:06 pm. On the last day of July, sunrise is at 6:01 am and sunset at 7:52 pm PDT.
Sunshine
With an average of 12.1h of sunshine, July has the most sunshine of the year in Ontario, California.UV index
The months with the highest UV index in Ontario, California, are July and August, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high threat to health from exposure to the Sun's UV radiation for average individuals.Note: The maximum daily UV index, 7 in July, converts into the following recommendations:
Skirt overexposure. People with light complexions might get scorched in under 20 minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Boost your sun resistance with garments that are densely woven yet spacious.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is it in Ontario in July?
What is the average humidity in July in Ontario?
How many days does it rain in July in Ontario?
When it does not snow in Ontario?
How many hours of daylight does Ontario have in July?
When are sunrise and sunset in July in Ontario?
What month has the most sunshine in Ontario?
How long on average sun shines in July in Ontario?
What are the months with the highest UV index in Ontario?
What is the UV index reading in July in Ontario?
Average temperature in July
Ontario, CA
- Average high temperature in July: 90°F
The warmest month (with the highest average high temperature) is August (91°F).
The month with the lowest average high temperature is December (62.1°F).
- Average low temperature in July: 64.8°F
The month with the highest average low temperature is August (65.8°F).
The coldest month (with the lowest average low temperature) is December (45.5°F).
Average pressure in July
Ontario, CA
- Average pressure in July: 29.89"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).
Average wind speed in July
Ontario, CA
- Average wind speed in July: 5.1mph
The windiest months (with the highest average wind speed) are April and May (5.8mph).
The calmest month (with the lowest average wind speed) is September (4.4mph).
Average humidity in July
Ontario, CA
- Average humidity in July: 45%
The months with the highest relative humidity are March and May (54%).
The month with the lowest relative humidity is August (42%).
Average rainfall in July
Ontario, CA
- Average rainfall in July: 0.16"
The wettest month (with the highest rainfall) is February (1.77").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in July
Ontario, CA
- Average rainfall days in July: 2.8 days
The month with the highest number of rainy days is March (7.1 days).
The month with the least rainy days is June (1.2 days).
Average snowfall days in July
Ontario, CA
- Average snowfall days in July: 0 days
The month with the highest number of snowfall days is February (0.1 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).
Average daylight in July /
Average sunshine in July
Ontario, CA
- Average daylight in July: 14h and 1min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in July: 12h and 1min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The months with the least sunshine are February and December (Average sunshine: 6h and 54min).
Average sunshine days in July
Ontario, CA
- Average sunshine days in July: 25.4 days
The month with the most sunshine days is June (28.2 days).
The month with the least sunshine days is February (21.5 days).
Average UV index in July
Ontario, CA
- Average UV index in July: 7
The months with the highest UV index are July and August (UV index 7).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in July
Ontario, CA
- Average cloud cover in July: 6
The month with the most cloud cover is December (Cloud cover 21).
The month with the least cloud cover is August (Cloud cover 5).
Average visibility in July
Ontario, CA
- Average visibility in July: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Ontario, California, USA
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