The heat and humidity seem to be settling in for a long time in southern Quebec where the weather will be warm with a record high humidity for Wednesday.

A heat warning has been issued by Environment Canada and concerns several southern sectors, including Montreal, Gatineau, Lanaudière, the Laurentians and Montérégie.

The warning will be in effect until Wednesday when seasonal normals will reach 36 degrees with a Humidex of 40 or higher, according to the federal agency.

This heat wave will bring in its wake a lot of instability, synonymous with showers in several sectors of the province.

In Montreal and its surroundings, an alternation of sun and clouds is expected with possible showers in the afternoon, while the mercury will still be on the rise with a Humidex 38.

The rain should water certain sectors of the center of the province, in particular the region of Quebec and Estrie as well as Saguenay where temperatures of 25 degrees are expected.

In eastern Quebec, the federal agency predicts rain with risk of thunderstorms in Gaspésie and on the North Shore, while temperatures will drop significantly.

Wednesday will bring instability due to a low pressure system that will mainly affect the center of the province.