The same record breaking high which delivered unusually cool temps to Southern Britain to end August and meteorological summer shifted position from near Iceland to Germany then delivered the warmest September day to Ireland and Scotland since 1906, since 1961 for Wales and 2016 for England.
The below pressure chart shows the set up with the UK placed NW of a low over the Bay of Biscay and high over Germany, winds blowing between these two features transported very warm, humid air WNW into Britain.
While unusually warm throughout Ireland, it was the Atlantic coastal communities which saw the highest temperatures.
Located on the Iveragh Peninsula of Co Kerry, the village of Glenbeigh recorded a temperature of 28.6C which made for the Republic of Ireland’s warmest September day since 1906.
Several sites in the SW corner of Ireland witnessed their warmest September day’s in recorded history.
A record breaking day in Ireland with new September maxima for Shannon Airport 27.9°, Kilkenny 27.6° , Claremorris 26.4° and Sherkin Island 23.8°. The previous records (all in 1991) were exceeded by +1.8, +1.0, +1.3 and +0.6, respectively. @extremetemps @eddy_weather @EKMeteo
— Kilkenny Weather (@kilkennyweather) September 7, 2021
In Britain, Gogerddan near Aberyswyth in Cardiganshire saw a sweltering maximum of 30.7C. This made for the highest September temperature measured in Wales since 1961.
Also, a minimum of 20.5C was recorded in Aberporth which surpasses a minimum of 18.9C at Rhyl back in 1949 as the warmest September night for Wales. Exeter, Devon also observed an unusually late ‘tropical night’ with a minimum of 20.1C.
While temps eased down over SW Britain, they climbed further north. A temperature of 28.8C was reached at Charterhall, Berwickshire making for Scotland’s warmest September day since 32.2C was reached at Gordon Castle, Moray back in 1906!
Glasgow was close behind Charterhall with a high of 28.2C, likely making it the city’s warmest September day.
While only England’s warmest September day since 2016, several sites observed their warmest September day’s on record.
Chivenor 29.5°C prev 27.3°C/2004
Brize Norton 29.3°C prev 28.2°C/2006
Yeovilton 29.3°C prev 27.3°C/82,04,20
Hereford 29.0°C prev 27.4°C/2005
Middle Wallop 29.0°C prev 28.1°C/2005
Little Rissington 28.8°C prev 27.4°C/2006
Lyneham 28.8°C prev 28.1°C/2005— Official Weather UK ☀️ (@OfficialWXUK) September 7, 2021
Some stations in Eastern England reached heat wave criteria.
EAST: With Cambridge NIAB reaching a high of 29.4°C on Wednesday, closely followed by Wittering and Bedford at 29.3°C, several sites have now recorded an official heatwave (at least 3 consecutive days ≥27°C) ? pic.twitter.com/08anwqUWAd
— Dan Holley (@danholley_) September 9, 2021
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