Weather log September 2021
Mostly dry start to September though rather cloudy, warmed up from 4th to heatwave conditions:
Sat 4th start of a notable September very warm/ hot spell (Gogerddan 23.4c, Lwn 23.1c, ROW 22.3c).
Sun 5th max CITE & Wellesbourne 26.0c, CL, Lwn & Trawsgoed 25.3c, Shobdon 23.5c, MH 19.6c with a fair bit of sunshine.
Mon 6th very warm or hot, more refreshing on some coasts, max Astwood Bank, Worc 28.8c, CL & Coleshill 28.1c, Nottingham 26.6c, Lwn 25.4c, Trawsgoed 23.9c, Aberdaron 18.8c. Sunny periods especially Midlands.
Tue 7th hot or very hot and sunny; maxima reached 30c in places; for Wales it was the hottest September day since 1961 with Gogerddan, near Aberystwyth max 30.7c hottest in the UK. Here at Llanwnnen max 29.7c smashed the previous record for the month (26.9c in 2016 and 2020). Other max...CITE & Coleshill 30.4c, Trawsgoed 30.1c, Coventry 29.8c, Hereford & Shobdon 29.0c, Pembrey 28.4c, Mumbles 25.2c.
Wed 8th warm night for WW, min 16.4c the warmest night of the year here at Lwn, while the Marches got down to more pleasant levels; other minima Aberporth 20.5c, Pembrey Sands 20.1c, Coventry 14.8c, Mona 13.4c, Shobdon 10.0c...the drought ended with showers during the evening here at Lwn, the first measurable rain for 18 days.
Thu 9th warm sunny intervals but also thundery showers gave 2 inches in places judging by the radar; rain totals to 2100 Gogerddan, Ceredigion 37.6mm, ROW 20.0mm; totals to 0600 10th - Trawsgoed 26.6mm, Pershore 19.2mm, CL 7.2mm, Valley 1.2mm, Nottingham 0.0mm; here at Llanwnnen just 3.1mm in the 24 hours to 0900 10th with most of the downpours focused a few miles to our north.
Fri 10th another warm night, min 15.7c, thats 3 in succession above 15c here at Lwn (note none above 15c for the whole of the Summer!); other minima Pembrey Sands 16.9c, Nottingham 16.8c, Coventry 16.5c, Aberdaron 15.6c, Shobdon 13.3c..the Autumn 'heatwave' though now over with a lot of cloud and some showery rain in places and temperatures by day getting closer to average though still rather warm for many...
The average temperature so far this month is way above normal across the country and on par with the warmest of Summer months, mean temperature to date here on 17.6c way above the previous warmest whole Sept (15.5c in 2006), however with cooler weather now in the offing it is unlikely to end up that way. (Mean max 23.1c to 9th)..
Mon 13th Milford Haven 15.0mm wettest place in UK 24 hours to 0600, rain and drizzle affected much of Wales, N & W Midlands, rest of Midlands mainly dry; other totals: Lwn 9.2mm (09-0900); Shawbury 5.4mm, Valley 0.2mm, CL & Pershore 0.0mm.
Tue 14th heavy rain for parts of Wales yesterday evening into the night with over an inch locally, here at Lwn 26.5mm measured this morning was one of the wetter spots although several PWS in the Cross Hands area of Carmarthenshire had 30m -35mm from the event...other rainfall totals to 0600 Aberporth 10.8mm, MH 3.8mm, Shawbury 3.2mm, Nottingham 0.0mm. Much of the Midlands had a good drop of rain during the daytime, when WW and Marches mainly dry and bright; CL 11.6mm
Often dry and bright from mid month, especially for the Midlands, many days still on the warm side too:
Sat 18th warm sunny spells for the Midlands, mostly cloudy with some showers WW; maxima Coventry 24.2c (warmest place in the Midlands), Coleshill 23.7c, Hereford & Shawbury 22.0c, Lwn 20.2c, Pembrey & Trawsgoed 19.8c, Aberporth 16.7c.
Fri 24th warm and humid with sunny intervals, maxima Pershore 25.0c, Coleshill 24.0c, Llanwnnen 21.6c, Trawsgoed 21.4c, Nottingham 21.3c, Mumbles 17.6c.
Sat 25th a warm night for late September, minima widely above 15c; Shawbury & Trawsgoed 16.5c, CL & Coleshill 15.6c, Lwn 15.1c, Aberporth 14.5c, Shobdon 13.8c...
Much cooler unsettled end to the month:
Mon 27th heavy rainfall overnight WW which then affected Midlands morning clearing to showers, local thunder, as at Lwn 1600; Lwn 27.4mm (24 hrs to 0900); 24 hour totals to 1200 Valley 36.0mm, Aberporth 30.8mm, Shobdon 15.4mm, Coventry 11.4mm, Mumbles 10.8mm, Church Lawford 5.0mm; much cooler by day, temperatures had widely been above 15c in the early hours then dropped off with the frontal passage and barely exceed the midnight values during the afternoon, for example Trawsgoed 17c early hours only 16c afternoon.
Nature notes
Sat 4th Lampeter Uni pm, Kingfisher flashed by within 10 feet by the stream; 50 plus H Martin & Swallow seems like they had a good year! Also a Chiffchaff singing a bit...
Further Chiffchaffs heard in the Uni and also from the garden (9th) early in the month...
Still some Swallows around mid month and a few House Martins..
Wed 15th: Nolton Haven, Pembs, Chiffchaff singing well from adjacent scrub and woodland along with plentiful Robin; 10- 15 Swallow above the lanes as we headed home early evening.
Mid month sounds: Starling singing one afternoon from next door aerial, Chiffchaff snatches still being heard, Great Tit 'teacher' calling, possible snatch of a Wren, as well as numerous Robins that will keep up until into New Year.
Mon 20th still some H Martins & Swallows active in Lampeter..
Late flush of Raspberries in the garden hedgerows (not had this happen before they are usually all over by August).
Thu 23rd female Sparrowhawk alighted on the patio bench observed for 2 minutes (it was watching for birds on the adjacent feeders) at just 3 metres distance as I sat by the window (best ever view of a BOP!).
Sun 26th several Swallows Llangrannog and Aberaeron; Starlings feeding in the harbour mud low tide with others singing from tops of boat masts!
WW warm, rather wet and quite dull.
Midlands warm, generally rainfall around average but with local wet spots; sunshine also around average.
Many places saw more rain in the last 5 days of the month than in the preceeding 25.
Valley 96.0mm (134%)
Aberdaron 79.2mm (121%)
Aberporth 104.2mm (147%)
Llanwnnen 139.0mm (122%)
Milford Haven 92.4mm
Pembrey Sands 99.6mm (128%)
Mumbles 86.4mm (112%)
Nottingham 46.2mm
Shawbury 55.0mm (96%)
Coleshill 52.0mm (84%)
Coventry 67.8mm (115%)
Church Lawford 64.4mm (99%)
Shobdon (Herefordshire) 68.6mm (112%)
Hereford 49.2mm (97%)
Pershore 77.8mm (149%)
Ludlow (Salop) 68.1mm (107%)
Alvechurch (Worc) 63.0mm (96%)
Warstock (Bham) 54.5mm (87%)
Cosby (Leic 38.4mm (66%)
Hinckley (Leic) 56.5mm
Daventry PWS (Northants) 42.6mm
Towcester (Northants) 52.8mm (86%)
Llansadwrn (Anglesey) 113.7mm (112%)
Valley 117.5 hours (89%)
Aberdaron 137.7 hrs
Aberporth 101.5 hrs (71%)
Llanwnnen estimated 100 hours (80%)
Shawbury 117.8 hrs (100%)
Coventry 145.6 hrs (106%)
Shobdon 130.3 hrs
