United Kingdom

Old Harry Rocks

5–20 mMax Depth

boatEntry

1Species

Conditions Summary

Model forecast · local time (GMT+1)

Model conditions signal81/100

Waves

0.6 m

3.3 s

Swell

0.1 m

4.5 s

Current speed

2.4 km/h

flowing toward SW

Water temperature

17.2°C

Wind

31.0 km/h

→ N

Sea level

-0.5 m

rising

WavesWatch

SwellCalm

Current speedWatch

Forecast Overview

Sun, Oct 18Watch

Waves0.5–0.7 mCurrent speed3.1 km/h maxWater temperature17.2°C

Mon, Oct 19Watch

Waves0.5–0.8 mCurrent speed3.0 km/h maxWater temperature17.0°C

TodayWatch

Waves0.5–0.8 mCurrent speed3.0 km/h maxWater temperature16.8°C

TomorrowWatch

Waves0.4–0.5 mCurrent speed2.8 km/h maxWater temperature16.8°C

Next 72 hours

08:00

Waves: 0.5 m

Current speed: 2.7 km/h

Water temperature: 17.2°C

14:00

Waves: 0.7 m

Current speed: 1.5 km/h

Water temperature: 17.2°C

20:00

Waves: 0.7 m

Current speed: 2.8 km/h

Water temperature: 17.1°C

02:00

Waves: 0.5 m

Current speed: 1.7 km/h

Water temperature: 17.0°C

08:00

Waves: 0.6 m

Current speed: 2.7 km/h

Water temperature: 17.0°C

14:00

Waves: 0.7 m

Current speed: 1.9 km/h

Water temperature: 17.0°C

20:00

Waves: 0.7 m

Current speed: 3.0 km/h

Water temperature: 16.9°C

02:00

Waves: 0.5 m

Current speed: 1.5 km/h

Water temperature: 16.8°C

08:00

Waves: 0.8 m

Current speed: 3.0 km/h

Water temperature: 16.8°C

14:00

Waves: 0.7 m

Current speed: 1.4 km/h

Water temperature: 16.8°C

20:00

Waves: 0.5 m

Current speed: 1.9 km/h

Water temperature: 16.8°C

02:00

Waves: 0.4 m

Current speed: 1.9 km/h

Water temperature: 16.8°C

Catalog depth5–20 m

Data sources & field guideOpen-Meteo Marine + Weather APIs

Planning context, not a safety guarantee. Coastal model accuracy is limited. Confirm the actual briefing, entry, exit, and suitability with a local operator.

Open-Meteo Marine + Weather APIs →

Dive readiness

Collecting the latest marine conditions and forecast signals.

Seasons · water temperature

12-month outlook

Best window

May-Oct

Peak month

Aug 17.5°

Jan9.1°

Feb8.3°

Mar8.2°

Apr9.3°

May11.3°

Jun13.8°

Jul16.0°

Aug17.5°

Sep17.2°

Oct15.6°

Nov13.2°

Dec10.8°

Current: moderate

Typical visibility: 8 m

Historical planning data from the recorded site profile. Water temperature and conditions can vary by day, depth, and weather; confirm current conditions with a local operator.

Explore nearby centers on the map

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Dive Types

reefsalt Waterintermediate Difficulty

Questions to ask a local operator

What are today's current, visibility, entry, and exit conditions?
Does the planned route stay within my certification and recent experience?
Are there local permits, conservation rules, or equipment requirements?

Common Species

12 km · nearby observations

Crimora papillata

DeepLog1

Callionymus lyra

Nearby OBIS observations10

Pleuronectes platessa

Nearby OBIS observations9

Buglossidium luteum

Nearby OBIS observations7

Anemonia viridis

Nearby OBIS observations6

Crepidula fornicata

Nearby OBIS observations6

Larus ridibundus

Nearby OBIS observations6

Rhodophyta

Nearby OBIS observations6

Alcyonidium diaphanum

Nearby OBIS observations5

Bottlenose dolphin

Tursiops truncatus

Nearby OBIS observations5

Lanice conchilega

Nearby OBIS observations5

Solea solea

Nearby OBIS observations5

These are nearby biodiversity records, not a guarantee that every species will be seen on a particular dive.

DeepLog + OBIS →