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Porth Nanven - Photo 1
Photo: Porth Nanven - geograph.org.uk - 497839.jpg via Wikidata Q7231741 License

Porth Nanven

Beach

Rainy today

Porth Nanven (grid reference SW355307; most well known as Cot Valley and occasionally known as Penanwell) is a beach in the far west of Cornwall, England, United Kingdom. It is located half-a-mile west of the town of St Just. The beach is at the seaward end of the Cot Valley and is part of the Aire Point To Carrick Du Site of Special Scientific Interest.

Interactive map not available

Current water conditions

Water temp
66°F
19°C
Cool water — ease in carefully. Cool enough to cause cold-water shock on a sudden entry. Get in gradually, let your breathing settle, and keep an eye on weaker swimmers.

Live data from NOAA buoy 62107 (17.7 mi away), as of Aug 21, 4:00 AM UTC. Conditions are for general information only and can change quickly — always judge the water in person and follow posted advisories before swimming.

Weather at Porth Nanven

H: 61° L: 60°
Light rain shower
Light rain shower
60°
|
Feels like 55°
Precipitation
66%
Humidity
76%
Wind
10 mph
UV Index
0
Water Conditions:
🥶Too cold for most swimmers🌧️Rain expected
12 AM
Patchy rain nearby
61°
3 AM
Moderate rain at times
60°
6 AM
Light rain shower
60°
9 AM
Light rain shower
60°
12 PM
Sunny
61°
3 PM
Sunny
61°
6 PM
Sunny
61°
9 PM
Clear
60°

Sponsored gear checklist

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Frequently asked questions

Where is Porth Nanven?
Porth Nanven is a beach in Cornwall.
What is the water temperature at Porth Nanven?
As of August 21, 2026, the water temperature at Porth Nanven in Cornwall is 66°F (19°C), measured by NOAA buoy 62107, 17.7 miles away.
Can you swim at Porth Nanven?
There is no fixed answer for Porth Nanven: whether it is safe to swim there on a given day depends on the water temperature, recent rainfall, and any advisories posted at Porth Nanven in Cornwall. Check current water conditions before you go, and follow posted signs and local guidance.

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Water temperatureCrowds & parkingBest time to goSafety & access

Best Times to Visit

🌧️
Right Now
Not ideal for outdoor activities today
🏖️ Swimming Beaches Tips:
  • ›Arrive early for best parking and beach spot selection
  • ›Check for lifeguard schedules and swim only in designated areas
  • ›Bring reef-safe sunscreen to protect marine life
  • ›Watch for beach flags indicating water conditions
Best Seasons:
☀️ Summer (Jun-Aug)🍂 Fall (Sep-Nov)🌸 Spring (Mar-May)

Location & Contact

Cornwall

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GuidesBest Times to Visit Beaches and Avoid the CrowdsSafetyWater Safety 101: Rip Currents, Cold Water, and Drowning PreventionFamilyFamily Beach Trip Planning: Ages, Gear, and Logistics