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Watch House Bay

the Vale of Glamorgan, Wales
Poor Water Quality
Data last verified: 12 Nov 2026

Watch House Bay, a picturesque coastal gem in the Vale of Glamorgan, Wales, boasts a stunning shoreline of sand and shingle. However, the bay's water quality has been classified as Poor by Natural Resources Wales, which may deter some visitors. During the summer months, the water temperature at Watch House Bay is estimated to be around 15°C.

6.6°C
Air Temp
14 mph
Wind Speed
Low Tide (1.58m)
in 51m (01:45) • Spring Tide
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Live Water Quality

30
Poor
Not advised
• Updated 10 mins ago
Today's Conditions • Updated 10 mins ago

Lifeguards

Unknown
Help us verify

Air Temp

6.6°C
Comfortable

Weather

Clear sky
6.6°C

Tide

Low Tide (1.58m)
in 51m (01:45) • Spring Tide

Water Quality

Poor
Not advised

Pollution Alerts

None
No alerts today

Quick Overview

Sand & Shingle beach
Family friendly
Dog friendly
(winter)
Parking nearby
Toilets
Café

Beach Information View all details

Beach Type
Sand, Shingle
Water Quality
Poor
Avg. Air Temp
6.6°C
Swimming
Highly recommended

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Reference Information

🌊 Live Tide Curve, Tidal Range & 7-Day Schedule

Harmonic astronomical predictions, tidal coefficients & flow rate

Spring Tide • Coeff 90
Current Water Level
Falling ↓ (2.02m)
86% through current tide cycle (LAT)
Upcoming High & Low
▲ High: 08:01 (10.40m • in 7h 8m)
▼ Low: 01:45 (1.58m • in 51m)
Tidal Range & Coefficient
Range: 8.82m (Coeff 90/120)
Large tidal range — faster tidal currents and higher high water.
Current Tidal Flow
Moderate Ebbing Flow
Rule of Twelfths: fastest flow occurs in mid-tide hours 3 & 4.
📈 24-Hour Harmonic Tide Curve (LAT)
Station: Barry (0.79 km)
11.8m 6.2m 0.5m 23:0003:0007:0011:0015:0019:00 Low 01:45 (1.6m)High 08:01 (10.4m)Low 14:03 (1.7m)High 20:18 (10.1m) NOW
📅 7-Day High & Low Tide Table
Day High & Low Tides (Local Time) Tidal Range Coeff / Phase
Wed 11 Nov ▼ Low 13:31 (1.41m)▲ High 19:46 (10.41m) 9.00m Spring (92)
Today ▼ Low 01:45 (1.58m)▲ High 08:01 (10.40m)▼ Low 14:03 (1.67m)▲ High 20:18 (10.06m) 8.82m Spring (90)
Fri 13 Nov ▼ Low 02:16 (1.86m)▲ High 08:34 (10.07m)▼ Low 14:35 (1.99m)▲ High 20:51 (9.67m) 8.21m Coeff 82
Sat 14 Nov ▼ Low 02:48 (2.17m)▲ High 09:07 (9.70m)▼ Low 15:10 (2.33m)▲ High 21:26 (9.26m) 7.53m Coeff 72
Sun 15 Nov ▼ Low 03:24 (2.52m)▲ High 09:45 (9.30m)▼ Low 15:49 (2.70m)▲ High 22:07 (8.84m) 6.78m Coeff 62
Mon 16 Nov ▼ Low 04:07 (2.89m)▲ High 10:30 (8.91m)▼ Low 16:37 (3.05m)▲ High 22:56 (8.47m) 6.02m Coeff 52
Tue 17 Nov ▼ Low 05:00 (3.23m)▲ High 11:24 (8.58m)▼ Low 17:38 (3.32m)▲ High 23:57 (8.21m) 5.35m Neap (43)
Reference Station: Barry • Model: FES2022 Global Ocean Model • Datum: LAT Tide predictions via TidesAtlas
Next 4 Tides
Spring Tide
Low 01:45 1.58m
High 08:01 10.40m
Low 14:03 1.67m
High 20:18 10.06m
Current: Falling (2.02m) • Moderate Ebbing Flow
Sediment Type
Sand, Shingle

The shoreline consists primarily of sand, shingle. Sediment type dictates underfoot comfort, wave energy absorption, and the water's clarity when currents stir up the seabed.

Annual Rating
Poor

Water quality regularly fails to meet safe bathing standards. Swimmers face an elevated risk of stomach infections or skin rashes due to high bacterial loads.

Rainfall Impact
High Risk

Bacterial levels are highly susceptible to storm runoff. Heavy rainfall in the local catchment is likely to trigger storm overflows and agricultural runoff, rendering the water temporarily unsafe.

Monitoring Authority
Environment Agency

Tested weekly by the Environment Agency England for bacteria levels (E. coli & Intestinal Enterococci) between May and September.

Water Body Type
Coastal Beach

Monitored as a coastal beach. Coastal beaches are subject to tidal flows and marine dilution, whereas inland lakes/rivers suffer from low water circulation, meaning bacteria can linger longer.

Sewerage Provider
Unknown

Unknown is the regional utility responsible for waste water treatment, sewage infrastructure, and storm overflow management in this catchment area.

Designated Year
2023

Officially designated as a protected bathing water site in 2023. This designation mandates regular public health monitoring.

County / District
the Vale of Glamorgan

Governed under local district sanitation and environmental safety regulations in the the Vale of Glamorgan area.

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