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Why would our front door have opened by itself? It was locked. It has an entrance set - a latched, not deadbolt, knob handled, keyed on the outside and turnsnib on the inside style lock. We have had a 40 degree Celsius day and the aircon had been on all evening and there is a bit of wind outside. The door opens inwards.

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Is it possible the latch was not fully engaged? – The Evil Greebo Jan 4 at 15:26
Possibly, at least I hope so, being after midnight that it happened. I remember going out the front door a few hours earlier to check the mail box so maybe that could be why. – Donna Jan 4 at 15:39
Ghosts? No, the answer is clear: the door wasn't latched. The pressure imbalance between the inside and outside prevented a full latch and it eventually blew/sucked open. – Matthew Jan 4 at 19:40
I think it was ghosts, or dead pirates, maybe a zombie??? – shirlock homes Jan 4 at 21:22
Thanks everyone for your answers. I was thinking it was the not fully latched and pressure imbalance reason. I survived the night without a zombie eating my brains, thanks shirlock homes. – Donna Jan 4 at 23:48

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Because although it was locked, the latch was not fully engaged. If it was very cool inside and very hot outside, especially if there was any humidity, I'm not surprised to hear that the latch didn't click into place the last time it was closed.

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Thanks. I was kind of telling myself something like that. I just needed to put my mind at ease before going to sleep. – Donna Jan 4 at 15:50

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