Quick Answer
Sarnia is expected to get near- to above-normal snowfall in the 2025–26 winter season, along with colder weather patterns and several strong winter storms. A weak La Niña is expected to continue into early winter — which often brings more storms and lake-effect snow across Southwestern Ontario.
Fast Outlook Chart
| Weather Factor | 2025–26 Forecast for Sarnia | What It Means |
|---|---|---|
| Snowfall | Near to above normal | Likely more snow than last winter |
| Temperatures | Near to slightly below normal | Colder periods with mild breaks |
| Winter Storms | Several moderate storms, a few stronger systems | Expect more frequent cleanups |
| Lake-Effect Snow | Moderate risk | Cold northwest winds over Lake Huron could bring snow bands |
Why More Snow Is Expected
According to NOAA’s Climate Prediction Center, La Niña conditions are likely to continue through December 2025 to February 2026. La Niña winters typically support colder air over Canada and more storm activity around the Great Lakes. The Weather Network’s early winter outlook also says Ontario should expect near- or colder-than-normal temperatures, with several high-impact winter weather events across the season.
Temperature and Snow Pattern
Sarnia will likely see classic winter swings — mild days followed by cold snaps — but overall trending slightly colder. With colder air in place, snow from Colorado lows, clipper systems, and lake-effect bands will have a greater chance of sticking.
How This Compares to a Normal Winter in Sarnia
Environment and Climate Change Canada data shows Sarnia normally receives around 110–130 cm of snow each winter. With La Niña in place and colder air expected, totals could end up slightly above average if storm tracks and lake-effect winds line up.
Last year’s winter was milder with less consistent snowfall — this year is shaping up to be closer to a “classic Ontario winter.”
What Else We Might See This Winter
Here’s what homeowners and businesses should prepare for:
- Quick bursts of lake-effect snow from Lake Huron after cold fronts
- A few stronger storms that bring heavy snow or mixed ice and snow
- Colder stretches that increase the need for salting and ice control
- A possible late-winter warm-up if La Niña weakens around February or March
Should You Book Snow Removal Early?
Yes — if this forecast holds, snow removal companies may be busier than last winter. Seasonal snow contracts guarantee priority service no matter how often it snows. If you want to see average pricing, link this section to your snow removal cost blog.
Final Word
Winter 2025–26 in Sarnia is expected to be snowier and colder than last year. With a weak La Niña, active storm tracks, and lake-effect potential from Lake Huron, it’s a smart year to prepare early, line up snow removal, and get ice control supplies ready.
Sources
NOAA Climate Prediction Center – ENSO Diagnostic Discussion (October 2025)
https://www.cpc.ncep.noaa.gov
The Weather Network – 2025–26 Winter Forecast for Canada
https://www.theweathernetwork.com
Environment and Climate Change Canada – Sarnia Historical Climate Data
https://climate.weather.gc.ca
Farmers’ Almanac – Ontario Winter Forecast 2025 (used for general trend reference)
https://www.farmersalmanac.com