Weather log September 2025
Key
WW= Willow Warbler
ST = Song Thrush
BB = Blackbird
Unsettled start to the Autumn:
Thu 3rd showery, thunder in places, inc Coventry & Rugby.
Fri 4th heavy rain overnight SW Wales, over 2 inches for the Kidwelly/ Llanelli area (PWS's).
Scattered showers daytime, isolated thunder, sferics near Monk's Kirby late morning and so thunder would have been heard from Rugby and probably eastern Cov (reported from Wolvey).
Sun 7th warm night, min 17.1c equal warmest of the year to date here at Lwn (with June); other minima Trawsgoed 18.1c (20c there early hours), Pershore 17.4c, CC 15.1c, Nott & Shobdon 14.0c. Heavy rain and thunder parts of West Mids today.
Mon 8th showery, thunder in places inc a rumble here at Lwn midday, looked like the Aberystwyth area caught an active storm 1300. Temperature dropped from and earlier 17c to 12c in a heavy shower here.
Thu 11th showery lots of Cb's all over the country seen on webcams. Thunder in places, Cov a lively storm late afternoon. Over an inch in places.
Fri 12th showers and again thunder inc Cov & Rugby.
Mon 15th prolonged streamers into N Wales giving over 3 inches around Snowdon (radar), official wettest in UK Capel Curig 61.4mm; in contrast it missed the Lleyn Peninsular (1mm).
First half of September has been very wet generally; rather cool/ average temperatures; generally rather dull.
Just parts of NW Wales around average rain, elsewhere above average, some places well over the whole Sept average.
Rain 1st to 15th Sept:
Mona 45mm (rather wet), CC 192mm (very wet), Trawsgoed c 85mm (v wet), Aberporth c 75mm (v wet), Llanwnnen 81.5mm (very wet), PS 111mm (v wet), MH 97mm (v wet).
Nott c 45mm (wet), Shawbury c 45mm (wet), Coleshill c 36mm (r wet), Coventry 49.6mm (v wet), CL 44mm (wet), Pershore 59mm (v wet), Shobdon 64mm (v wet).
Sunshine 1st - 15th:
Valley 61 hrs ( r dull), Aberdaron 54 hrs (r dull), Aberporth 59 hrs (r dull), Llanwnnen est 51 hrs (rather dull); Shawbury 57 hrs (r dull), Coventry 67 hours (rather dull), Shobdon 59 hrs (r dull).
Fri 19th a dry and warm day Mids with sunny spells; WW humid but mainly cloudy with rain or drizzle in places, temps around average; maxima Wellesbourne 24.4c, Cov & Pershore 23.4c, Shobdon 20.2c, Trawsgoed 19.0c, CC 15.7c.
Sat 20th spells of heavy rain much of WW giving over 3 inches for some, local thunder (inc here at Lwn mid afternoon). Many gauges caught around 2 inches today, and 4 inches locally, wettest NRW gauge Ysbyty Ifan near Blaenau Ffestiniog & Pwll Peiran near Devil's Bridge both 87mm; wettest MO station Swyddffynnon 67mm. Also of note 24 hours to midnight: Trawsgoed 67mm and Rhos Ymryson (5 miles from Llanwnnen) 62mm. Parts of the West Mids caught some of the heavy rain but no for long and E Mids mostly stayed dry.
Sun 21st one of the wettest September days here yesterday 0900 total 37.9mm (wettest still 46.6mm Sept 2018).
A fine dry spell towards month end with plentiful sun but some cold, frosty nights:
Mon 22nd widespread ground frost and air frosts in places; here at Lwn min -2.4c was the coldest Sept night on record (beating -1.9c in 2018). Other minima Tirabad -1.7c, Pershore -0.4c, Swyddffynnon & Trawsgoed 0.0c, CITE +1.4c, Cov & Nott 5.6c, Aberdaron 7.8c.
Then 4 more nights having at least a grass frost (all below 2c) here at Llanwnnen, such a run has not happened in September before.
Nature notes
Fri 6th Aberaeron: still some active HM nests, many of this seasons nests have fallen down (hopefully post fledging). Several small groups of Swallow seemingly headed south along the coastline. 20+ HM evening. Sad case of the Razorbill, perhaps bird flu (young couple and Martin).
Sat 7th still some active HM nests near Morrisons Aberystwyth.
Still plenty of hirundines mid month; been quite a few butterflies this month especially whites and Red Admirals.
Sun 21st nice sunny day for a change, at least 2 Hornets and several Red Admirals enjoying the apple bonanza (most fruitful season ever here).
Mon 22nd around half dozen Red Admirals about the Apple trees, 2 Comma, Speckled Wood, 3 or 4 Hornets.
Tue 23rd no hirundines seen past couple of days and so they have gone now mostly.
Fri 24th Newquay a few Choughs by the shell fish factory. Also several distant Dolphins and apparently a Grey Seal.
Summary Sept 2025
Wet/ very wet west Wales; Midlands varying rather dry to very wet; sun varying rather dull to quite sunny; rather cool to average temperatures
165mm here at Lwn the wettest Sept here (159.4mm 2023).
Llanwnnen 20 year ave for Sept here is c 113mm, past 5 Septembers averaged 152mm.
Quite a few parts of SW Wales twice the average.
Rainfall totals Sept 2025
Mona, Anglesey 176mm (v wet)
Capel Curig, Snowdonia 335mm (wet)
Trawsgoed, Ceredigion 189mm (v wet)
Aberporth, near Llangrannog 162mm (v wet)
Llanwnnen 164.9mm (149%)
Pembrey Sands, Carms 189mm (v wet)
Milford Haven, Pembs 176mm (v wet)
Nottingham 83mm (wet)
Shawbury, Salop 103mm (very wet)
Coleshill 50mm (rather dry)
Coventry, Bablake School 64.8mm (110%)
CL, Warks 58.4mm (90%)
Pershore, Worc 65mm (rather wet)
Hereford 68mm (r wet)
King's Newnham EA gauge (near Rugby) 54.4mm
National Resources Wales (NRW) rain gauges Sept 2025
(06-0600 totals off Starlings Roost):
Llyn Cefni, Ynys Mon 181mm (v wet)
Bethesda Quarry (Gwynedd) 198mm (wet)
Cwm Dyli (Snowdonia) 423mm (wet)
Abersoch (Llyn Peninsular) 142mm (v wet)
Corris (near Machynlleth) 375mm (wet)
Bow Street (near Aberystwyth) 163mm (v wet)
Pontrhydfendigaid (near Tregaron, Ceredigion) 167mm (wet)
Rhos Ymryson (near Gorscoch and 5 miles NW of Lwn) 188mm (v wet)
Cellan (2 miles NE of Lampeter) 174mm (v wet)
Pencader (Carms) 251mm (v wet)
Abergorlech (Brechfa Forest, Carms) 220mm (v wet)
Rhydargaeau (Carms) 278mm (v wet)
Garnswllt (near Ammanford, Carms) 230mm (v wet)
Felinfoel (near Llanelli, Carms) 245mm (v wet)
Southgate, Gower 133mm (wet)
Ferwig (near Cardigan) 165mm (v wet)
Maenclochog (near Preselis, Pembs) 266mm (v wet)
Tenby (Pembs) 180mm (v wet)
Bolton Hill (near Haverfordwest, Pembs) 180mm (v wet)
COL stations rainfall Sept 2025
Llansadwrn 178mm (176%)
Ludlow, Salop 78mm (122%)
Alvechurch, Worc 74.7mm (114%)
Warstock, Brum 79mm (120%)
Alcester (Great Alne) 94.6mm
Cosby, Leic 55mm (94%)
Hinckley 61mm (105%)
Towcester, Northants 48mm (78%)
Sunshine totals Sept 2025
Valley 135 hrs (near average)
Aberdaron 124 hrs (rather dull)
Aberporth c 145 hrs (ave)
Llanwnnen estimated 113 hrs (89%)
Nottingham 136 hrs (ave)
Shawbury 129 hrs (ave)
Coventry, Bablake School 133 hrs (100%)
Shobdon, Herefordshire 136 hrs (ave)
COL stations sun:
Ludlow 131 hrs (94%)
Alvechurch 139 hrs (109%)
Cosby 143 hrs (102%)
Towcester 172 hrs
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