On the 6th June 1944, an Allied force of British, American and Canadian troops carried out the largest seaborne invasion in history, landing on the beaches of Normandy in France to begin the liberation of Axis-occupied Europe.
The weather was crucial to the success of D-Day. Actor David Haig has written a play called 'Pressure'.
The play, at the Minerva Theatre in Chichester, tells the true story of the tensions between General Eisenhower, the Allied Supreme Commander, and Dr James Stagg, the Chief Meteorological Officer for the Met Office.
When should the attack be launched? Simon has been to find out more.
Monday's weather forecast
Philippa has the outlook for the week ahead
A vigil has been held to remember the three victims of the terror attack in Reading.