What time zone is Mountain Ash in?

Mountain Ash uses Greenwich Mean Time (GMT, UTC+0) in winter and British Summer Time (BST, UTC+1) in summer. Its IANA time zone is Europe/London.

When is the next clock change in Mountain Ash?

Clocks in Mountain Ash move forward 1 hour on Sunday, March 28, 2027 at 1:00 AM, changing from GMT (UTC) to BST (UTC+01:00)

Does Mountain Ash observe daylight saving time?

Yes. Mountain Ash observes daylight saving time: BST (UTC+1) in summer and GMT (UTC+0) in winter.

What is the UTC offset of Mountain Ash?

Mountain Ash is UTC+0 in winter and UTC+1 in summer

Current Time in Mountain Ash, Rhondda Cynon Taf, Wales, United Kingdom

10:41:05 AM

10:41:05

Tuesday, October 27, 2026

GMT (Greenwich Mean Time) · UTC

Europe/London

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Time zone details

Mountain Ash is currently on standard time; daylight saving time is observed in 2026

Daylight in Mountain Ash

Sunrise6:58 AMSolar noon11:57 AMSunset4:55 PM

Next clock changeMar 28, 2027 · Clocks move forward 1 hour · in 151 daysUpcomingView details Weather nowLoading current forecast…Forecast details

Location facts

Place

Country: United Kingdom
Administrative area: Wales
District: Rhondda Cynon Taf
Place type: Populated place
Country currency: British Pound (GBP)

Practical

Country languages: English, Welsh, Scottish Gaelic
Dialing code: +44
Population: 11,230
Elevation: Approximately 116 m (DEM estimate)

Geography

Geographic coordinates: 51° 41' N / 3° 22' W

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Clock changes in Mountain Ash

Next clock change

Upcoming

Sunday, March 28, 2027

1:00 AM GMT2:00 AM BST

Clocks move forward 1 hour

Sunday, March 29, 2026past
Daylight saving time starts
1:00 AM GMT2:00 AM BST
Clocks move forward 1 hour
Sunday, October 25, 2026past
Daylight saving time ends
2:00 AM BST1:00 AM GMT
Clocks move back 1 hour

Future clock changes, 2027–2030

United Kingdom daylight saving time Clock changes worldwide

Sun & Moon details

Sunrise: 6:58 AM
Solar noon: 11:57 AM
Sunset: 4:55 PM
Daylight duration: 9 hr 57 min3 min 43 sec shorter than the previous day

Civil twilight: 6:23 AM – 5:30 PM
Nautical twilight: 5:44 AM – 6:09 PM
Astronomical twilight: 5:05 AM – 6:48 PM

Full MoonMoon illumination97%

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Tuesday, October 27, 2026

View Mountain Ash on SavvyTime's time-zone map

Sun

Sunrise: 6:58 AM (east, 109.8°)
Sunset: 4:55 PM (west, 249.9°)
Day length: 9 hr 57 min3 min 43 sec shorter than the previous day
Solar noon: 11:57 AM (25.5° altitude)

Civil twilight

Dawn to dusk: 6:23 AM – 5:30 PM

Additional twilight

Nautical dawn to dusk: 5:44 AM – 6:09 PM
Astronomical dawn to dusk: 5:05 AM – 6:48 PM

Moon

Phase: Full Moon (97% illuminated)
Moonrise: 4:59 PM (northeast, 49.4°)
Moonset: 9:01 AM (northwest, 308.1°)
Previous principal phase: Full Moon — Monday, October 26, 2026 at 4:12 AM
Next principal phase: Third Quarter — Sunday, November 1, 2026 at 8:28 PM

Seven-day daylight outlook

Sunrise, sunset, and daylight for seven local dates
Local date	Sunrise	Sunset	Day length	Daily change
Tuesday, October 27	6:58 AM	4:55 PM	9 hr 57 min	3 min 43 sec shorter than the previous day
Wednesday, October 28	7:00 AM	4:53 PM	9 hr 53 min	3 min 42 sec shorter than the previous day
Thursday, October 29	7:02 AM	4:51 PM	9 hr 49 min	3 min 40 sec shorter than the previous day
Friday, October 30	7:03 AM	4:49 PM	9 hr 46 min	3 min 39 sec shorter than the previous day
Saturday, October 31	7:05 AM	4:47 PM	9 hr 42 min	3 min 38 sec shorter than the previous day
Sunday, November 1	7:07 AM	4:46 PM	9 hr 39 min	3 min 36 sec shorter than the previous day
Monday, November 2	7:09 AM	4:44 PM	9 hr 35 min	3 min 35 sec shorter than the previous day

Weather forecast for Mountain Ash

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Plan around Mountain Ash

Upcoming public holidays in Wales

Fri, Dec 25, 2026Christmas Day
Sat, Dec 26, 2026Boxing Day
Mon, Dec 28, 2026Boxing Day (substitute day)

Nearby places

Browse places in United Kingdom

Frequently asked questions

What time zone is Mountain Ash in?: Mountain Ash uses Greenwich Mean Time (GMT, UTC+0) in winter and British Summer Time (BST, UTC+1) in summer. Its IANA time zone is Europe/London.
When is the next clock change in Mountain Ash?: Clocks in Mountain Ash move forward 1 hour on Sunday, March 28, 2027 at 1:00 AM, changing from GMT (UTC) to BST (UTC+01:00)
Does Mountain Ash observe daylight saving time?: Yes. Mountain Ash observes daylight saving time: BST (UTC+1) in summer and GMT (UTC+0) in winter.
What is the UTC offset of Mountain Ash?: Mountain Ash is UTC+0 in winter and UTC+1 in summer