Calgary forecast is frigid with 26-degree temperature swing on the way

Oct 20 2026, 4:19 pm

Calgary weather is about to take a turn, with the temperature set to swing by a chilly 26 degrees as we roll into the weekend.

According to Environment and Climate Change Canada (ECCC), Calgary can expect to see a relatively warm week before overnight temperatures drop below zero over the weekend.

Tuesday is set to be a warm day, with the daytime high hitting 12°C before dropping to 0°C at night.

Wednesday is the warmest day in the forecast, with a high of 19°C before falling to just 4°C overnight. Thursday will be slightly cooler, with a daytime high of 16°C and an overnight low of 1°C, along with periods of rain.

calgary temperature swing

Environment and Climate Change Canada

Things start to cool down on Friday, with a high of just 6°C and rain in the forecast before temperatures dip to -3°C overnight.

Saturday is set to see the coldest temperature of the week overnight, with a high of just 2°C during the day and a chilly low of -7°C, a whopping 26-degree drop from Wednesday’s high of 19°C.

Sunday will bring even colder daytime temperatures, with a high of just -1°C and a low of -6°C. Things will start to warm up slightly on Monday, with the daytime high expected to reach 4°C.

According to ECCC, the average high for Calgary around this time of year is 10°C, while the average low is -3°C.

While Calgary may be in for a temperature swing, we spoke to ECCC to see what’s in store for Alberta’s weather over the next three months, and things are looking mild.

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