2008 · During April and May 1944 the weather had been relatively settled and the forecast centres in general agreement. Once the decision was made to invade in early June the weather became much more. Tuesday 6 June 1944 Tuesday 6 June 1944 (D-Day) Weather chart for 1300 UTC on 6 June 1944 General summary Most places dawned cloudy with continuing showers across northern and eastern.