Greater Sudbury Weather Forecast – Thick Fog, Persistent Rain, and a Gloomy Yet Gradual Weekend Warm-Up
Foggy Morning and Rain on the Radar
Greater Sudbury, ON – Thursday, May 22, 2025: If you’re looking for sunshine in Sudbury today… you may want to check back next week. This morning’s forecast kicks off with dense fog — visibility is reduced to just 0.8 km as of 5:26 AM at Greater Sudbury Airport. The temperature sits at 8.0°C, with the dew point matching the air temperature, resulting in 100% humidity — in other words, you’ll feel the dampness in your bones. Winds are currently from the north-northeast at 13 km/h, and the barometric pressure is at 100.9 kPa and falling, confirming that today’s rain is just getting started.
Periods of rain are expected throughout the day, with 5 to 10 mm of precipitation on the way. Winds will strengthen slightly this afternoon, becoming northeast at 20 km/h. Temperatures won’t budge much, with a high of just 9°C and a UV index of 1, which means you can officially leave the sunscreen at home — and possibly replace it with a good book and a blanket.
More Rain Tonight and Through Friday
Tonight, the skies don’t let up. Periods of rain will continue, delivering an additional 10 to 15 mm, and temperatures will dip only slightly to a low of +5°C. Expect the air to stay heavy and damp, perfect for frogs and rainboots — not so much for outdoor evening plans.
Friday keeps the umbrella parade going with another 5 to 10 mm of rain, a high of 8°C, and skies stuck in full grey mode. The UV index remains at 1, and showers continue Friday night with a low of 6°C. Safe to say your rain jacket is going to earn its keep this week.
Weekend Outlook: Slowly Clearing and Slightly Warmer
By Saturday, rain chances decrease a bit but don’t disappear entirely. Expect cloudy skies and a 60% chance of showers, with a high of 12°C. It’s a modest improvement and may offer a few dry breaks between drizzle spells. Saturday night holds a 40% chance of showers with a low of 6°C.
Sunday finally brings a glimmer of hope: a mix of sun and cloud with a 30% chance of showers, and a more seasonable high of 18°C. That might not be beach weather, but it’s certainly a welcome shift from the soggy mess leading up to it.
What to Wear?
It’s a full waterproof wardrobe day: raincoat, boots, umbrella, and maybe an extra pair of socks — just in case. Layers will help with the damp chill, and a hat wouldn’t hurt either if you’re walking through the fog. The cool wind from the northeast adds an extra edge, so be sure to dress for warmth as well as wet.
Historic Temperatures for May 22
On this day in Sudbury’s weather history, the record high reached 30.1°C, while the record low dipped to a frosty -2.2°C. Today’s high of 9°C and constant rain sits somewhere in the “meh” zone — not freezing, not sweltering, just soggy.
Sudbury Weather Trivia
Did you know Sudbury has more lakes within its city limits than any other municipality in the world? With over 300 lakes, it’s no wonder this area feels extra damp during a stretch of rainy weather. All that water acts like a sponge — and today, the clouds are ringing it out.
