Castle · near Rhoose · South Glamorgan

Fonmon Castle

Fonmon Castle is a castle near Fonmon, Vale of Glamorgan. It is 300 m northwest of Rhoose. The register lists it as a Grade I listed building.

Photo: Fonmon Castle, Stewart Black from British Isles (CC BY 2.0)

Where

300 m

northwest of Rhoose

How well known

Top 16%

#1,300 of 8,556 places we list

Warmest months

Jun–Sep

highs of 19–21°C

In brief

Castle near Rhoose

Just outside Rhoose

Fonmon Castle is 300 m northwest of Rhoose. Towns near it ↓

Grade I listed building

On the official list of protected heritage; Rhoose has 5 listed buildings in all, on its History page. About ↓

Written from OpenStreetMap, Wikidata, the ONS built-up areas and Met Office 1991–2020 averages.

When to go

Seasons and weather

Aim for June to September, when Rhoose reaches 19–21°C.

Jan9° / 3°97 mm

Feb9° / 2°68 mm

Mar11° / 3°70 mm

Apr14° / 5°57 mm

May17° / 8°62 mm

Jun19° / 10°65 mm

Jul21° / 12°81 mm

Aug21° / 12°89 mm

Sep19° / 11°79 mm

Oct15° / 8°104 mm

Nov12° / 5°112 mm

Dec9° / 3°108 mm

Green months are the warmest. Typical afternoon highs and night lows in Rhoose, and rain in a month. Met Office HadUK-Grid 1991–2020 averages for Rhoose. Opening times change through the year: check before you go. Rhoose’s full climate →

About

Fonmon Castle

Readers can find it on Wikipedia in 6 languages. Look also at St Fagans Museum Visitor Centre, 11 km away, first of 73 more within 15 km.

Rhoose’s listed buildings and monuments →

Type: Castle
Listed: Grade I listed building
Wikipedias: Covered in 6 languages
Town: 300 m northwest of Rhoose
Official site: fonmoncastle.com

Facts: Wikidata (CC0) and OpenStreetMap (© OpenStreetMap contributors).

The map

Around Fonmon Castle, mapped

Orange: Fonmon Castle.

Towns near it

Which towns are near Fonmon Castle

Largest of the 4 is Barry, home to 56,589. Its own town leads; the rest list it too, closest first.

1 · 300 m southeast of it

Rhoose

6,776 people · 8 places to visit

2 · 2.3 km west of it

St Athan

1,594 people · 7 places to visit

3 · 3 km west of it

Eglwys-Brewis

3,300 people · 8 places to visit

4 · 4.5 km east of it

Barry

56,589 people · 13 places to visit

Compare the 4 towns

Town	Where Fonmon Castle is	People	Places to visit
Rhoose	300 m southeast of it	6,776	8
St Athan	2.3 km west of it	1,594	7
Eglwys-Brewis	3 km west of it	3,300	8
Barry	4.5 km east of it	56,589	13

Make a day of it

Make a day of it near Fonmon Castle

Our list has 73 more within 15 km, among them 4 castles, a museum and a cathedral.

Big drawMuseumSt Fagans Museum Visitor Centre11 km away · 610K visitors a year 2

CathedralLlandaff Cathedral15 km away 3

Castle · CadwOld Beaupre Castle5.5 km away 4

CastleBarry Castle5.4 km away 5

CastleEast Orchard Castle1.9 km away 6

Castle · CadwSt Quintin's Castle8.4 km away 7

Historic houseSaint Fagans Castle12 km away 8

Garden · National TrustDyffryn Gardens6.5 km away

Within 15 km, close and well known first. Numbers match the map.

Asked about Fonmon Castle

Where is Fonmon Castle?

Fonmon Castle is 300 m northwest of Rhoose, South Glamorgan.

What is Fonmon Castle?

Castle near Fonmon, Vale of Glamorgan, Wales.

When is the best time to visit Fonmon Castle?

June to September are the warmest months in Rhoose, with afternoon highs of 19–21°C (Met Office 1991–2020 averages).

Is Fonmon Castle a listed building?

Yes: Grade I listed building.

What else is there to see near Fonmon Castle?

Within 15 km: St Fagans Museum Visitor Centre (11 km), Llandaff Cathedral (15 km), Old Beaupre Castle (5.5 km) and Barry Castle (5.4 km).

Places: OpenStreetMap (© OpenStreetMap contributors, Open Database Licence) and Wikidata (CC0), placed in the ONS 2022 built-up area (Open Government Licence v3.0). Visitor counts are the latest Wikidata gives, with their year.

Photos: each place’s Wikidata image, from Wikimedia Commons under the licence below (our copy, resized).

Photo credits (9)

Fonmon Castle: Stewart Black from British Isles, CC BY 2.0, Wikimedia Commons
St Fagans Museum Visitor Centre: Sionk, CC BY-SA 4.0, Wikimedia Commons
Llandaff Cathedral: Bill Boaden, CC BY-SA 2.0, Wikimedia Commons
Old Beaupre Castle: FruitMonkey, CC BY-SA 3.0, Wikimedia Commons
Barry Castle: Cath Mudford, CC BY-SA 3.0, Wikimedia Commons
East Orchard Castle: Ben Salter from Wales, CC BY 2.0, Wikimedia Commons
St Quintin's Castle: cowbridgeguide.co.uk, CC BY 3.0, Wikimedia Commons
Saint Fagans Castle: Llywelyn2000, CC BY-SA 4.0, Wikimedia Commons
Dyffryn Gardens: Ben Salter, CC BY 2.0, Wikimedia Commons

Contains public sector information licensed under the Open Government Licence v3.0. Contains HM Land Registry data © Crown copyright and database right 2026. Contains OS data © Crown copyright and database right 2026 (ONS boundaries). Northern Ireland: Source: NISRA; contains Land & Property Services data and Ordnance Survey of Northern Ireland information, © Crown copyright, licensed under the Open Government Licence v3.0. Scotland: contains National Records of Scotland data, Registers of Scotland data and SEPA data, © Crown copyright / © SEPA 2025, licensed under the Open Government Licence v3.0.