Environment Canada has issued a special weather statement for Southern Ontario in anticipation of some wild temperature swings.
A low pressure system out of the United States will bring a smorgasbord of weather our way including rain and possible thunderstorms today, very warm air tonight and into tomorrow, plus some gusty winds.
Temperatures tomorrow are likely to break records, with highs expected in the low to mid teens.
However, by Thursday, Environment Canada says Arctic air will return and we'll be back below seasonal values.
Officials liken the up and down temperatures to a roller coaster ride.
The normal high for this time of year is -1.