Very weird, it looks like e.g. Manhattan, New York, USA has also one hour difference, but in the other direction... Compare temperature/rain:
(Windy, Meteoblue AI forecast selected)
(Meteoblue.com, forecast; sum of first three rain bars = 1.6mm; sum of last two rain bars = 0.8mm)
(Same for e.g. Rotterdam, The Netherlands.)
For example, Windy-Meteoblue shows higher temperatures than Meteoblue.com (i.e., the temperature of one hour earlier, as I was able to confirm by looking at the hourly forecast of Meteoblue.com), whereas in the case of London (see topic start) Windy-Meteoblue shows lower temperatures than Meteoblue.com (i.e., the temperature of one hour later, as, I was, again, able to confirm).