your increase in temp is going to reduce air density, so effectively your density alt. If we look at a massive temp increase. Then an airfield with an elev of 2,000` and an outside temp of 40 deg C, is going to perform as if it was at a much higher altitutde. get it?
Less dense. More forwards speed required (G/S) to achieve the same airspeed (TAS)
therefore need a longer runway. Have you got a longer runway? If not, either you don`t go, or you unload cargo, why would you do that? Or aska few passengers to disembark ( hint,start with the cargo first . . ) you may consider removing some fuel, not an option that most, if not all pilots tend to entertain, although physically possible, you will then have to change you flight routing and alternates etc. etc., etc. - figure out your speed adjustment from all that and it should come easy now. ok? Good luck with it all.