Warmer with showers & thunderstorms by Tuesday

A variable sky on Saturday over Montreal with more clouds than sun. Sunday was a perfect weather day. 
(ValleyWX Photo)

After a great weekend, back to work Monday is looking much warmer and more humid. L'Ile Perrot is already at 19C (66F) early this Monday morning with nothing but sunshine. It will remain that way for the entire day with high temperatures pushing 28C (83F). The work week won't last long here in Quebec, as we have our provincial holiday tomorrow (Le Fete, St jean Baptiste Day), call what you want, it is a day off work. Unfortunately the sunshine will not last either. A frontal system will move into southern Quebec overnight with increasing clouds followed by showers and thunderstorms for Tuesday. Some of the storms may have very heavy rain. It has already been a wet month with nearly 130mm (over 5 inches of rain) here in Montreal. Normal rainfall at Trudeau Airport for June is 87mm, and we are well beyond that with a week to go. Temperatures tonight will remain warm near 20C (68F). On Tuesday cloud cover and showers should keep temperatures down between 21 and 24C (70-75F). It should clear out Wednesday with sunshine and a high near 24C (76F).