Barometric Pressure in Saint Thomas, Canada 
1020.3 hPa
10.3 ℃
92%
1.84 m/s
Get Alerts 🚨. Sign up to receive alerts when the barometric pressure changes significantly.
The average pressure in Saint Thomas, Ontario, Canada today is , which is considered normal. Pressure is trending falling.
Weather prediction: Rain at times, very unsettled
The daily total fluctuation in pressure in Saint Thomas is , with a low of and a high of .
Forecast
Hourly Pressure Trends
Track the barometric pressure in Saint Thomas hour by hour across the next 6 hourly readings.
Saint Thomas sits on fairly flat land north of Lake Erie, so winds can move across the area with few barriers. Storm systems often arrive from the west or southwest. Low pressure usually brings thicker clouds, rain, or snow, while high pressure often brings clearer, calmer conditions.
Lake Erie can soften temperature swings and add moisture, especially when winds blow from the south or east. In cooler months, that moisture may help cloud or snow bands form, though the city is far enough inland that these effects are often weaker than along the shore.
Winter is cold, with frequent freeze-thaw changes and snow; spring warms unevenly and can be rainy. Summers are warm and often humid, while autumn turns cooler and brings changing winds. Strong low-pressure systems can cause quick shifts in any season as fronts cross the open farmland.