Felt muggy over my way too, Graham, with Exeter now reporting a dew point
of
17C (air temp 19C).

Blimey, that Exeter Airport temperature/DP is all over the place again.
Sometimes it is 3C or 4C higher or lower than my readings.

Currently, as you say Exeter Airport is recording 19C and a DP of 17C.

Here are my recordings below:

(20:40), 17.3°C, RH 82%, DP 14.2°C, 1024.9 hPa (R), Wind 4 mph S.
________________
Nick.
Otter Valley, Devon
83 m amsl
http://www.ottervalley.co.uk