Sun 26 May, London dew point forecast

AM early DPMax 13°C TempMin 24°C
8AM DP 12°C 10AM DP 13°C
12PM DP 13°C 14PM DP 13°C
Overnight to 8AMDPMax 20°C TempMin 20°C
Reducing internal dew points, as displayed on hygrometers, is key to reducing condensation and mould risk. Even the best ventilation won’t reduce the internal dew points below external dew points without dehumidification. This is because dew points correspond to vapour quantity. When air is vented out, it is replaced by air from the outside, which, when it is raining, is saturated with vapour.