The Greenhouse heaters are on, in August!!

I knew it was going to go cold last night. The forecast said just slightly above freezing. But this morning in checking my greenhouse, the heater was on.

Max/min recorder said it went down to 2 deg C

The heater is set at just above freezing for the winter months, but in August!! I think its going to be an early autumn, and the leaves will start dropping soon.

Forecast for tomorrow is rain all day, on the last Bank holiday till Xmas.