United Kingdom
Portland Harbour
8–14 mMax Depth
boatEntry
12Species
Conditions Summary
Model forecast · local time (GMT+1)
Model conditions signal91/100
Waves
0.8 m
3.8 s
Swell
0.2 m
5.3 s
Current speed
0.8 km/h
flowing toward SW
Water temperature
17.0°C
Wind
16.2 km/h
→ NE
Sea level
-0.9 m
falling
WavesWatch
SwellCalm
Current speedCalm
Planning window
04:45–04:00
Calmest model window
Forecast Overview
Mon, Oct 19Challenging
Waves0.7–1.1 mCurrent speed3.0 km/h maxWater temperature17.0°C
Tue, Oct 20Watch
Waves0.5–1.0 mCurrent speed2.6 km/h maxWater temperature16.9°C
TodayChallenging
Waves1.1–2.5 mCurrent speed3.0 km/h maxWater temperature16.8°C
TomorrowChallenging
Waves2.7–2.9 mCurrent speed2.0 km/h maxWater temperature16.8°C
Next 72 hours
Catalog depth8–14 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-Sep
Peak month
Aug 17.1°
Jan9.5°
Feb8.6°
Mar8.4°
Apr9.5°
May11.3°
Jun13.7°
Jul15.8°
Aug17.1°
Sep17.0°
Oct15.6°
Nov13.3°
Dec11.0°
Current: moderate
Typical visibility: 7.5 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
Loading…
Dive Types
driftsalt Waterbeginner 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
Broadnosed pipefish
Syngnathus typhle
DeepLog1
Eel-grass
Zostera marina
DeepLog1
European conger
Conger conger
DeepLog1
Glasswort
Salicornia europaea
DeepLog1
Greater pipefish
Syngnathus acus
DeepLog1
Northern lugworm
Arenicola marina
DeepLog1
Oyster drill
Ocenebra erinaceus
DeepLog1
Pacific bottlenose dolphin
Tursiops truncatus
DeepLog1
Red-banded jellyfish
Chrysaora hysoscella
DeepLog1
Sepia
Sepia officinalis
DeepLog1
Spotted sea hare
Aplysia punctata
DeepLog1
Whelk
Buccinum undatum
DeepLog1
These are nearby biodiversity records, not a guarantee that every species will be seen on a particular dive.
DeepLog + OBIS →Photos
