Barometric Pressure in London, Canada 
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The pressure in London, Ontario, Canada is predicted to slowly drop over the next few hours, with an average pressure of 989.2 hPa today, which is lower than normal.
Weather prediction: Expect more wet and unsettled conditions
The daily total fluctuation in pressure in London is 7.1 hPa, with a low of 984.4 hPa and a high of 991.5 hPa.
Forecast
Hourly Pressure Trends
Track the barometric pressure in London hour by hour and stay informed about how it will change over the next 6 hours.
Barometric pressure in London, Ontario, Canada is affected by the movement of high and low-pressure systems from the west. These systems bring changes in the weather. The pressure is higher when a high-pressure system is over the city, and lower when a low-pressure system is present.
London is situated in a valley in southwestern Ontario. The valley is surrounded by lakes and hills to the north and west. The landscape affects the flow of air into and out of the valley. When winds blow from the west, they must rise to cross the hills, cool, and condense, resulting in precipitation.
The city's location in the valley also leads to temperature variations. Cold air from the north and west settles in the valley, making it colder than surrounding areas. Warm air from the south and east has to rise to enter the valley, making it warmer than surrounding areas. As a result, London's temperature can be different from nearby cities.