Cool Morning Gives Way to a Sizzling Spring Surge
DRYDEN & VERMILION BAY, ON – May 10, 2025 – It’s a classic May morning in northwestern Ontario: chilly, quiet, and full of promise. At 5:00 AM, Dryden Airport reports a mainly clear sky with temperatures at 2.5°C, humidity sitting at 84%, and calm easterly winds at 8 km/h. Visibility is slightly reduced to 16 km due to lingering morning haze. The barometric pressure stands strong at 103.0 kPa—a good sign of stability before the heat wave kicks into high gear.
Expect a sunny start today, transitioning into a mix of sun and cloud by the afternoon. There’s a 30 percent chance of showers later in the day, so pack a small umbrella or a good excuse to head indoors just in case. Temperatures will climb to a pleasant 18°C, and with the UV index at 6, be sure to break out the sunscreen during those midday rays. Winds will swing south and pick up to 20 km/h through the morning.
Warm and Stormy Tonight, Hot and Humid Sunday
Tonight, things take a more dramatic turn. Skies remain partly cloudy with that same 30 percent chance of showers persisting into the night. There’s also a risk of a thunderstorm overnight as a surge of warm air pushes through. Winds will shift southeast this evening and calm briefly before turning south again and gusting to 40 km/h late tonight. The low will be a significantly warmer 8°C—no risk of frost here.
Sunday ramps everything up. It’ll be a mix of sun and cloud with a continued 30 percent chance of morning showers and the potential for an early-day thunderstorm. Winds from the southwest at 20 km/h will help drive the temperature up to a remarkable 29°C. That’s beach weather—assuming you can find a lake not still mentally recovering from winter. The UV index will hit 7, which is considered high.
Sunday night remains warm with cloudy periods and an unusually high overnight low of 17°C.
Monday Launches Full Summer Mode
If you thought 29°C was a May fluke, think again. Monday brings full sunshine and a scorching high of 30°C. The skies will clear Monday night and temperatures will ease to a comfortable 16°C—perfect for cooling off after a summer-like day.
What to Wear
Today is a layering kind of day—early morning gloves optional, afternoon shades essential. For Sunday and Monday, it’s officially shorts-and-tank-top weather. Don’t forget a raincoat for the odd shower or thunderstorm, and stay hydrated—this early-season heat can sneak up on you!
Weather Trivia: May Heat Is No Stranger to Dryden
Dryden’s warmest May 10 on record reached a balmy 30.6°C in 1987. The coldest? A frosty -6.3°C back in 1960. This year’s forecast, calling for 30°C on Monday, could bring us right back near the record books!
