Barometric Pressure in Thunder Bay, Canada 
1009.9 hPa
5.7 ℃
90%
7.16 m/s
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The average pressure in Thunder Bay, Ontario, Canada today is , which is considered normal. Pressure is trending rising.
Weather prediction: Fine, possible showers
Rapid Pressure Changes
Rapid pressure changes detected in Thunder Bay, often a sign of approaching weather shifts. See the forecast chart or get pressure alerts.
- Rapid Fall : ()
- Rapid Rise : ()
- Rapid Fall : ()
The daily total fluctuation in pressure in Thunder Bay is , with a low of and a high of .
Forecast
Hourly Pressure Trends
Track the barometric pressure in Thunder Bay hour by hour across the next 6 hourly readings.
Thunder Bay's location on Lake Superior creates changes in air pressure, with low pressure systems forming over the lake and moving east. This causes pressure to drop and rise frequently.
The city's high elevation and surrounding hills disrupt air flow, making it difficult for air masses to move smoothly, leading to changes in pressure. The landscape also traps cold air in the city during winter.
In winter, high pressure dominates, bringing cold air from the north. In summer, low pressure brings warm air from the south. Spring and fall see a mix of both, making pressure variable.
Thunder Bay has a continental climate, with large temperature and pressure swings between seasons. This leads to frequent changes in weather and pressure, making it important to check forecasts regularly.
(106 km)