Weather log September 2026

 Weather log September 2026

Key

WW = West Wales

Mids = Midlands

Lwn = Llanwnnen

AG = Aldermans Green, Coventry

CL = Church Lawford

LL = Long Lawford

ROW = Ross-on-Wye, Herefordshire, Hfd = Hereford, SB = Sutton Bonington, MB = Market Bosworth, AB = Astwood Bank, Nott= Nottingham, CITE = Coton-in-the-Elms, Derbyshire, CC = Capel Curig, Snowdonia, MH = Milford Haven, Swydd = Swyddffynnon

Carms = Carmarthenshire

Pembs = Pembrokeshire

Carms = Carmarthenshire

Pembs = Pembrokeshire

COL = Climatological Observers Link

PWS = Personal weather station

MO = Met Office

NRW = National Resources Wales

EA = Environment Agency

est = estimated

inc = including

cf = compared with

srb = since records began

CC = Chiffchaff
WW= Willow Warbler
ST = Song Thrush
BB = Blackbird

VW = very wet, W = wet, RW = rather wet, A = average, RD = rather dry, D = dry, VD = very dry

Mixed start to Autumn 2026:

Thu 3rd warm night, date record for Cov (min 17.7c), other Cardiff BP 17.8c, MH 17.5c, Gogerddan 17.4c,  Lwn 15.7c, CC 15.8c.

Sun 6th hot parts of Mids, warm to very warm generally. Maxima Wellesbourne 27.6c, Pershore 27.4c, CL, Cov & Usk 26.3c, Gogerddan 25.3c, PS & Sutton Bonington 24.7c, Nott 24.4c, Swydd 24.2c, Lwn 23.8c, Shawbury 23.7c, Aberporth 23.5c, Aberdaron 20.6c.

Sat 12th wet day much of Wales, Dinas NRW (Ceredigion) 46mm wettest in UK (CC 18mm wettest MO).

Sun 13th widely over an inch mid & S Wales in 24 hours, 2 inches locally, To 1330 Usk Res NRW 56mm, also Dinas 51mm, Myddfai 43mm. Lwn 27.2mm 0900 the wettest day since Feb (33mm). Over half inch parts of central/ south Mids (CL 15mm one of wettest). A warm night widely above 15c, minima PS 18.1c, Pershore 17.6c, ROW, Scolton CP & Wellesbourne 17.1c, Cov, Hereford & Shobdon 16.8c, Lwn & Trawsgoed 16.6c, Winterbourne 15.4c, Mona 14.7c.

A few more warm and humid days, Bablake had a run of 3 nights above 15c, while warmest was Hereford 26.2c and Trawsgoed 23.1c 14th.

Note Rhos Ymryson no data since first week but back by mid month.

First half September: warm or very warm; rainfall varying between dry and wet, dull to average sun.

Rainfall Sept 1st to 15th

Llanwnnen 68mm (r wet), Bablake 21mm (rather dry), CL 33.6mm (average).

Mona 44mm (r wet), Aberdaron 28mm (ave), Trawsgoed 76mm (wet), Aberporth 55mm (wet), MH 50mm (r wet).

Nott 31mm (ave), Shawbury 29mm (ave), M Bosworth 30mm, Coleshill 20mm (dry), Hereford 16mm (dry), Shobdon 21mm (dry).

Sunshine 1st to 15th: Llanwnnen 36 hours est (dull), Bablake 50 hours (r dull).

Aberdaron 63 hrs (dull), Aberporth 54 hrs (dull), Shawbury 48 hrs (r dull), Shobdon 58 hrs (r dull).

Mon 21st lovely warm sunny day in the Midlands, driving back to Wales warm and sunny to past Brecon but clouded over, back home it had been a mostly overcast day. Astwood Bank & Hereford 24.0c, Cardiff BP 23.7c, Coleshill & Cov 23.2c, Whitechurch 22.3c, Nott 21.7c, Lwn 20.1c, Aberdaron 16.8c.

Tue 22nd very warm sunny periods parts of Mids, max S Bonington 25.5c, Usk 24.1c, Cov 23.9c, Lwn 20.9c, Trawsgoed 20.7c, Aberdaron 17.5c. 

Tue 29th warm or very warm despite little sun generally, maxima Pershore 24.8c, CL 24.1c, Usk 22.8c, Lwn & Nott 22.5c, MH 19.9c. Lwn just 2.5 hrs sun and Bablake 0.6 hrs (23.7c). Kew 28.1c UK hot spot.

Wed 30th warm night above 15c Mids, minima St James Park 20.1c, Cov 17.5c, Valley 14.7c, Shobdon 14.2c,  Lwn 13.2c, CC& Tirabad 12.5c. Wet night WW, over an inch for some (Lwn 15.2mm).

Nature notes

Mon 1st Aberystwyth plenty of H Martins near Morrisons with over 20 nests (some fell off by now).

Start of month large flock of HS back garden focused on the southern thick overgrown hedge. Plenty of hirundines, one day 30 plus mainly Swallow feeding up over the field getting ready for the off. Robins have been back in song since mid to late August.

Tue 15th Forestry large flock of LTT, 30 plus sounded like, inc Goldcrests I think.

Mid month rebound from the drought this month with much grass and weed recovery almost as though in Spring mode again. Lawns being mowed again from the start of the month after almost 2 months left to go brown. Inc many Dandelions, much Clover, RWP, new ferns; everywhere nice and green again as it should be.

Not many hirundines about by mid month.

Sun 20th a couple of Swallows seen on drive to Mids.

Fri 24th Long Lawford 15 + Swallow in a group near the river at the old mill. Dad said they are in the old rectory near the ford but that the mill outbuildings were converted so no longer nesting there. Rooks & Jackdaws very active.

Late month more in the way of Butterflies esp Speckled Woods in the garden. Bees and Wasps enjoying Ivy pollen as these flower.

Wed 30th Newcastle Emlyn river walk around the castle, Kingfisher calling and seen rounding the far bend for almost 100m, then heard 10 minutes later sounded like it cut across the peninsular within the meander. Large flock LTT over 30 with some other spp mixed in inc a Treecreeper. Mix of quite a few dead, some almost dead and some hardly affected Ash trees in the area, dead ones being next to barely affected ones.

Summary September 2026

Warm or very warm; rainfall variable from very dry to wet rather dull to average sun

Cov third warmest Sept after 2023 and 2006. Pershore 2.7c above average.

Here at Llanwnnen warm but 4 warmer Septembers in past 20 years (record 15.8c 2023).

Most of Mids dry, many NRW gauge around average.

Rather dull month for most.

Rainfall totals Sept 2026

Mona, Anglesey 84mm (ave)

Capel Curig, Snowdonia 235mm (ave)

Aberdaron, Llyn Peninsular 65mm (ave)

Trawsgoed 115mm (r wet)

Aberporth, near Llangrannog 81mm (ave)

Llanwnnen 103.1mm (91%)

Milford Haven, Pembs 82mm (101%)

Nottingham 38mm (dry)

Shawbury, Salop 46mm (r dry)

Markey Bosworth 35mm (dry)

Coleshill 26mm (v dry)

Coventry, Bablake School 24.6mm (42%)

CL, Warks 36mm (55%)

Hereford 24mm (v dry)

King's Newnham EA gauge (near Rugby) c 31mm (faulty last week?)

National Resources Wales (NRW) rain gauges Sept 2026

Llyn Cefni, Ynys Mon 90mm (ave)

Bethesda Quarry (Gwynedd) 186mm (ave)

Cwm Dyli (Snowdonia) 271mm (ave)

Abersoch (Llyn Peninsular) 74mm (ave)

Corris (near Machynlleth) 237mm (r wet)

Bow Street (near Aberystwyth) 97mm (ave)

Pontrhydfendigaid (near Tregaron, Ceredigion) 118mm (ave)

Rhos Ymryson (near Gorscoch and 5 miles NW of Lwn) NA faulty early month

Cellan (2 miles NE of Lampeter) 91mm (r dry)

Pencader (Carms) 118mm (ave)

Abergorlech (Brechfa Forest, Carms) 116mm (r dry)

Rhydargaeau (Carms) 133mm (ave)

Garnswllt (near Ammanford, Carms) 143mm (ave)

Felinfoel (near Llanelli, Carms) 129mm (ave)

Southgate, Gower 75mm (dry)

Ferwig (near Cardigan) 86mm (ave)

Maenclochog (near Preselis, Pembs) 179mm (wet)

Tenby (Pembs) 79mm (r dry)

Bolton Hill (near Haverfordwest, Pembs) 89mm (ave)

COL stations rainfall Sept 2026

Llansadwrn 128mm (127%)

Ludlow, Salop 45mm (70%)

Alvechurch, Worc 50mm (76%)

Warstock, Brum 34mm (52%)

Hinckley 27mm (46%)

Towcester, Northants 26mm (42%)

Sunshine totals Sept 2026

Valley 123 hrs (r dull)

Aberdaron 137 hrs (near ave)

Aberporth 105 hrs (r dull)

Llanwnnen estimated 83 hrs (66%)

Nottingham 135 hrs (ave)

Shawbury 114 hrs (r dull)

Coventry, Bablake School 122 hrs (89%)

Wellesbourne 120 hrs (r dull)

Shobdon, Herefordshire 127 hrs (near ave)

COL stations sun:

Ludlow 125 hrs (90%)

Alvechurch 105 hrs (82%)

Towcester 162 hrs (quite sunny?)