Thunder Bay Weather Update – May 12, 2026: Rain, Cold, and Frustrated Gardeners

Thunder Bay Weather May 12 2026

Thunder Bay – WEATHER – It is nearing the middle of May, but spring warmth is still arriving in fits and starts. If April showers are supposed to bring May flowers, local gardeners may be wondering when the “flowers” part begins.

This morning is cool, with light rain showers and reports of snowflakes near the airport.

Current Conditions

Observed at Thunder Bay Airport at 7:00 AM EDT:

Condition: Mostly cloudy
Temperature: 2.0°C
Wind: ENE 20 km/h
Humidity: 81%
Pressure: 101.4 kPa and falling
Visibility: 32 km

Today’s Forecast

Expect a cold, wet day. Clouds continue with a 40% chance of showers early, followed by periods of rain beginning this morning. Higher terrain could see periods of snow.

High: 4°C
Wind: Northeast 20 km/h late this morning
UV Index: 2, or low

Tonight and Midweek Outlook

Tonight: Cloudy with a 40% chance of rain showers or flurries, with snow possible over higher terrain this evening. Low 1°C.

Wednesday: A welcome change arrives with mainly sunny skies and a high of 15°C. UV index 6, or high.

Thursday: Sunny again, high 15°C. Showers possible Thursday night.

Gardening Note

Gardeners should hold off on tender plants like tomatoes, peppers, cucumbers, and annual flowers. With a low of -1°C Wednesday night, frost-sensitive plants still need protection.

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