THUNDER BAY – WEATHER – That beautiful light in the sky this morning is the sun. The sun has been missing in action in Thunder Bay as clouds and rain have dominated the forecast.
Today, Thunder Bay is starting the first weekend of May with sunshine and a fresh spring feel. It is still chilly this morning, but today will be the best outdoor day of the weekend before clouds and showers move in tonight and Sunday.
Today’s Weather Overview
Current Conditions
Observed at Thunder Bay Airport at 9:00 AM EDT:
Condition: Sunny
Temperature: 1.9°C
Wind: Southwest at 5 km/h
Humidity: 61%
Pressure: 101.8 kPa and falling
Visibility: 32 km
Today will be sunny, with southeast winds increasing to 20 km/h late this morning. The high reaches 13°C, though the morning wind chill near -8 makes for a cold start. UV index is 6, or high.
Sunday and Monday Outlook
Expected Conditions
Tonight: Increasing cloudiness early this evening, with a 40% chance of showers overnight. Low 2°C.
Sunday, May 3: A mix of sun and cloud with a 40% chance of showers in the morning and early afternoon, becoming sunny late in the day. Northwest winds increase to 30 km/h, gusting to 50. High 14°C.
Sunday Night: Cloudy with a 40% chance of rain showers or flurries. Low 2°C.
Monday, May 4: Cloudy with a 60% chance of showers. Cooler, with a high of 7°C.
Wardrobe Recommendations
Sunglasses are a good idea today, but keep a jacket handy as the morning starts cold and winds increase. For Sunday, dress in layers and secure lightweight outdoor items, as gusts may reach 50 km/h. Waterproof footwear or a rain jacket will be useful from tonight through Monday.
Weather Trivia
Thunder Bay’s spring weekends can change quickly because of Lake Superior’s influence. Sunshine can push inland temperatures into the teens, while shifting winds can bring a sharp cooldown, clouds, or showers in just a few hours.
Summary
Thunder Bay weekend weather for May 2-4, 2026: Sunny Saturday with a high of 13°C, breezy Sunday with showers possible, and a cooler, cloudy Monday.
