THUNDER BAY – NEWS – Thunder Bay is starting Monday on the mild side for April, but the day still comes with a little leftover spring nuisance weather.
Environment Canada shows no active alerts for the City of Thunder Bay this morning, and the forecast calling for a mix of sun and cloud, a 40 percent chance of showers or drizzle this morning, and temperatures holding near 6°C.
Monday’s Weather Overview
At 8:26 AM EDT Monday, April 13, Thunder Bay Airport was reporting mostly cloudy skies, a temperature of 4.3°C, pressure at 100.9 kPa and rising, humidity at 94 percent, WSW wind at 7 km/h, and visibility at 32 km. That points to a fairly quiet start overall, with improving pressure and decent visibility after the murkier weather over the weekend.
Environment Canada’s detailed forecast says today will feature a mix of sun and cloud, with the chance of showers or drizzle mainly this morning. Fog patches are expected to dissipate this morning, and the temperature should stay close to 6°C through the day. The UV index is 5, or moderate.
Tonight and Into the Week
Tonight turns cooler again. The forecast calls for partly cloudy skies becoming cloudy near midnight, with a 30 percent chance of rain showers or flurries overnight and a low of 0°C.
On Tuesday, April 14, Thunder Bay is expected to stay cloudy with a 40 to 60 percent chance of rain showers or flurries, depending on the forecast view, and a daytime temperature near 2 to 3°C. Tuesday night remains cloudy with a low of -2°C.
By Wednesday, conditions improve a bit with a mix of sun and cloud and a high of 5°C, followed by cloudy periodsand a low of -1°C. Thursday looks milder, with cloudy skies and a high of 9°C.
Travel and Wardrobe Outlook
This is not a major travel-impact day, but the morning could still bring a few damp roads and some lingering patchy fog before conditions improve. A light waterproof jacket is a smart choice early, while an extra layer will still be useful tonight as temperatures slip back toward the freezing mark. That is an inference based on the official forecast for morning drizzle, fog, and a low near 0°C tonight.
Weather Trivia
Thunder Bay’s April weather often moves in short swings rather than one steady warm-up. This week’s setup is a good example: mild, damp air to start the week, then a return to near-freezing nights and a chance of mixed precipitation before milder air edges back in again later. This is an inference based on the official multi-day forecast pattern.
Summary
Thunder Bay weather forecast for April 13, 2026: mostly cloudy and mild this morning, a mix of sun and cloud today, then cooler tonight with a chance of rain showers or flurries.
