Barometric Pressure in Ottawa, Canada 
1002.5 hPa
9.9 ℃
87%
4.81 m/s
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The average pressure in Ottawa, Ontario, Canada today is , which is lower than normal. Pressure is trending rising.
Weather prediction: Fine, becoming less settled
Rapid Pressure Changes
Rapid pressure changes detected in Ottawa, often a sign of approaching weather shifts. See the forecast chart or get pressure alerts.
- Rapid Fall : ()
- Rapid Rise : ()
The daily total fluctuation in pressure in Ottawa is , with a low of and a high of .
Forecast
Hourly Pressure Trends
Track the barometric pressure in Ottawa hour by hour across the next 6 hourly readings.
Barometric pressure in Ottawa varies throughout the year, influenced by the movement of high and low-pressure systems. It can drop significantly during storms, causing windy conditions. During fair weather, pressure rises, leading to calm and settled conditions.
Ottawa is situated in the Ottawa Valley, where the Ottawa River flows. The surrounding landscape is a mix of flat plains and gentle hills. To the north and west, the terrain rises, forming a plateau. This unique geography affects the flow of air masses, which in turn influences the barometric pressure in the region.
The plateau to the north and west of Ottawa creates a rain shadow effect, blocking moisture-laden air from the Gulf of St. Lawrence. This leads to drier air masses moving into the region, causing pressure to rise. Conversely, when air masses from the Atlantic Ocean move in, they are forced to rise, resulting in lower pressure and precipitation.