Weather in Mississauga Hourly: Forecast & Climate Guide

If you live in Mississauga or are planning a visit, you know the weather can shift from sunny to snowy in just a few hours. Thanks to its position on Lake Ontario, the city sees everything from mild lake breezes in summer to heavy lake-effect snow in winter. This guide breaks down the hourly forecast, long-term climate averages, and the best times to visit, using data from Environment Canada and other trusted sources.

Average Annual Temperature: 8.5°C (47.3°F) ·
Average January Low: -8°C (17.6°F) ·
Average July High: 27°C (80.6°F) ·
Average Annual Precipitation: 793 mm (31.2 in)

Six key identifiers for Mississauga’s climate and location — all verified through official records and geographic databases.

What’s the temperature like in Mississauga today?

Hourly breakdown for today

Environment Canada’s hourly forecast for Mississauga on February 1, 2026, showed temperatures ranging from -16°C at 11:00 EST to -8°C by evening, with sunny and clear skies (Environment Canada). Wind speeds during winter gusts often reach 40 km/h from the northwest, driving wind chill values below -20°C (Holiday Weather).

Tomorrow’s forecast

• AccuWeather’s hourly outlook for May 2026 shows overnight lows around -5°C with partly cloudy skies (AccuWeather).
• Lake-effect snow can develop quickly when northwest winds blow over Lake Ontario, causing sharp hourly shifts in winter (National Weather Service (lake-effect primer)).

7-day and 14-day outlook

For a reliable 7-day forecast, the The Weather Network (GTA weather coverage) provides hourly breakdowns. Beyond 7 days, accuracy drops significantly; Environment Canada recommends checking daily for the latest updates.

How to check real-time weather

Bookmark the Environment Canada hourly page or use the AccuWeather Hourly widget for minute-by-minute conditions.

What are the best months to visit Mississauga?

Five distinct seasons, but only a few offer reliably pleasant outdoor conditions. The table below compares temperature and precipitation across key months.

Data sourced from Weatherbase and Weather Atlas.

Spring (April–May)

Rapid warming occurs, but lake-effect can hold temperatures cooler near the shore (WeatherSpark (annual climate data)). May is pleasant with average highs of 18°C.

Summer (June–August)

Warmest and most comfortable. July averages 27°C with low precipitation (75 mm). UV index peaks at 8–9, so sun protection is necessary (Weather Atlas July UV report).

Fall (September–October)

September stays mild (high 22°C), ideal for outdoor festivals. October cools to 14°C average high.

Winter (November–March)

Cold and snowy. December–February bring frequent lake-effect snow, with monthly snowfall averaging 25–30 cm (Toronto Mike (lake-effect overview)). Wind chills below -20°C are common.

How cold does Mississauga get?

Average winter temperatures

January average low is -8°C, with average high -1°C (ECCC Climate Normals). February is similar but slightly milder.

Record low temperatures

All-time record low is -31.1°C, recorded in January 1967 (Current Results (historical extremes)). That’s cold enough to cause frostbite in minutes.

Wind chill factor

Northwest winds gusting to 40 km/h can push wind chill below -20°C even when the air temperature is only -10°C (Holiday Weather wind data).

Comparison to other Ontario cities

Mississauga is milder than inland cities like Guelph because Lake Ontario releases heat during winter — lake-effect actually increases snowfall but moderates extreme lows (The Weather Network (lake-effect explanation)).

Which part of Ontario is Mississauga?

Location within the Greater Toronto Area

Mississauga sits immediately west of Toronto, on the northern shore of Lake Ontario. It is the largest city in the Region of Peel and a major suburban hub (Wikipedia (Mississauga geography)).

Proximity to Lake Ontario

The city’s 13 km of Lake Ontario shoreline gives it a unique microclimate. Lake breezes cool summers and warm winters compared to areas 20 km inland (Environment and Climate Change Canada station data).

Regional municipality of Peel

Peel Region includes Mississauga, Brampton, and Caledon. Mississauga is the economic anchor, with a population exceeding 700,000.

What is the coldest month in Mississauga?

January averages

January is the coldest month: average low -8°C, average high -1°C, and 20+ snow days influenced by lake-effect (ECCC Climate Normals).

February vs January

February averages are nearly identical but slightly warmer on average (low -7°C). January remains the peak of winter.

Coldest recorded day

January 1967 saw the all-time low of -31.1°C (Current Results).

“Lake Ontario can cause localized weather differences in Mississauga, especially during spring and fall, when the lake is still cold and the air is warm.”

— Environment Canada meteorologist (via ECCC climate data page)

“Mississauga receives about 30% more lake-effect moisture than Toronto proper because of its direct exposure to the open lake.”

— Global News meteorologist (via Global News lake-effect feature)

For Mississauga residents and prospective visitors, the implications are clear: the lake is both a blessing and a wildcard. Summer days cool off near the shore, but winter storms can intensify without warning. The decision to plan an outdoor event or trip should hinge on a recent hourly forecast combined with awareness of lake-effect patterns.

For a broader outlook beyond the hourly details, check the 10-day weather forecast for Mississauga to plan your week ahead.

Frequently asked questions