Cornwall to Montréal - Marine Weather - Environment Canada Environment Canada https://www.weather.gc.ca 2026-05-13T09:47:25Z tag:weather.gc.ca,2013-04-16:20260513094725 https://www.weather.gc.ca/template/gcweb/v15.0.0/assets/wmms-alt.png https://www.weather.gc.ca/template/gcweb/v15.0.0/assets/favicon.ico Copyright 2026, Environment Canada Forecast for Today Tonight and Thursday. - Cornwall to Montréal 2026-05-13T07:00:00Z 2026-05-13T07:00:00Z Wind light becoming southeast 15 knots this morning then diminishing to light near midnight. Wind becoming southeast 10 to 15 Thursday morning then backing to northeast 10 to 15 Thursday afternoon. Rain beginning late this morning. <br/>Issued 03:00 AM EDT 13 May 2026 tag:weather.gc.ca,2013-04-16:02900_regular_forecast:20260513070000 Extended Forecast - Cornwall to Montréal 2026-05-13T10:00:00Z 2026-05-13T10:00:00Z Friday: Wind northeast 15 knots diminishing to light in the afternoon.<br/>Saturday: Wind light increasing to southwest 15 to 25 knots.<br/>Sunday: Wind westerly 15 to 25 knots.<br/>Issued 06:00 AM EDT 13 May 2026 tag:weather.gc.ca,2013-04-16:02900_extended_forecast:20260513100000