THUNDER BAY – Thunder Bay is starting Thursday in the soup, with fog, saturated air, and low visibility setting the tone for a damp day ahead. Environment Canada shows no active alerts in effect for the City of Thunder Bay this morning, but the forecast still includes a 60 percent chance of drizzle or freezing drizzle overnight and more mixed nuisance weather into Friday.
Today’s Weather Overview
At 6:00 AM EDT, Thunder Bay Airport was reporting fog, a temperature of 0.4°C, 100 percent humidity, WSW wind at 7 km/h, and visibility reduced to just 0.6 km. Pressure was 100.9 kPa and rising, which suggests the system is slowly reorganizing rather than fully clearing out.
Environment Canada’s forecast for today calls for cloudy skies, with fog patches dissipating this morning and a high of 9°C. The UV index is 4, or moderate, so the day will be brighter on paper than it will likely feel under all that cloud cover.
Tonight and the Next Three Days
Tonight, Thunder Bay stays cloudy with a 60 percent chance of drizzle or freezing drizzle overnight. Winds are expected to turn northeast at 30 km/h overnight, and the low will hold near 1°C.
Friday continues the unsettled pattern. Environment Canada calls for cloudy skies with a 60 percent chance of drizzle with freezing drizzle, with east winds at 30 km/h gusting to 50 before easing in the morning. The daytime high is forecast to reach 6°C. Friday night then turns colder, with periods of rain or snow and a low of -4°C.
By Saturday, colder air is back in place, with a mix of sun and cloud and a 30 percent chance of flurries and a high of 2°C. Sunday looks much better, with sunny skies and a high of 5°C, followed by another cold clear night near -9°C.
Travel and Local Outlook
There is no formal city alert, but the mix of 0.6 km visibility this morning, plus the forecast risk of freezing drizzle tonight and Friday, means drivers and pedestrians should still stay alert for slick patches and quickly changing visibility. That is an inference based on the observed fog and the official forecast.
Wardrobe Recommendations
A waterproof jacket, shoes or boots with decent grip, and an extra layer for early morning and evening are the best choices today. It is not harshly cold, but it is damp, and the freezing drizzle risk later on means untreated surfaces could become slippery. This is an inference based on the official temperature and precipitation forecast.
Weather Trivia
Thunder Bay often gets these stubborn April fog and drizzle setups because cool air near Lake Superior can keep the lower atmosphere saturated even when daytime temperatures climb above freezing. That helps explain why the city can sit near 0°C in fog at dawn and still reach 9°C later in the day. This is an inference based on the official observation and forecast pattern.
Final Say
Thunder Bay weather update for April 16, 2026: fog and low visibility this morning, cloudy skies today, then a risk of freezing drizzle tonight and Friday before a sunnier Sunday.
