North America › Costa Rica
El Arco
5–25 mMax Depth
boatEntry
1Species
Conditions Summary
Model forecast · local time (GMT-6)
Model conditions signal71/100
Waves
1.5 m
12.3 s
Swell
1.4 m
10.5 s
Current speed
0.2 km/h
flowing toward S
Water temperature
30.6°C
Wind
3.7 km/h
→ E
Sea level
1.1 m
falling
WavesChallenging
SwellWatch
Current speedCalm
Forecast Overview
Mon, Oct 19Challenging
Waves1.4–1.5 mCurrent speed0.3 km/h maxWater temperature30.5°C
Tue, Oct 20Challenging
Waves1.4–1.5 mCurrent speed0.9 km/h maxWater temperature30.4°C
TodayChallenging
Waves1.4–1.5 mCurrent speed1.0 km/h maxWater temperature30.3°C
TomorrowChallenging
Waves1.4–1.5 mCurrent speed1.2 km/h maxWater temperature30.0°C
Next 72 hours
Catalog depth5–25 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.
Updated: cached data
Open-Meteo Marine + Weather APIs →Dive readiness
Collecting the latest marine conditions and forecast signals.
Seasons · water temperature
12-month outlook
Best window
Dec-Apr
Peak month
Mar 29.6°
Jan28.7°
Feb29.2°
Mar29.6°
Apr29.6°
May29.1°
Jun28.8°
Jul28.6°
Aug28.6°
Sep28.4°
Oct27.8°
Nov27.5°
Dec28.1°
Current: mild
Typical visibility: 20 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.
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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
Imbricata atlantic hawksbill
Eretmochelys imbricata
DeepLog1
Humpback whale
Megaptera novaeangliae
Nearby OBIS observations34
Acanthurus xanthopterus
Nearby OBIS observations12
Arothron meleagris
Nearby OBIS observations10
Chelonia mydas
Nearby OBIS observations8
Epinephelus labriformis
Nearby OBIS observations8
Triaenodon obesus
Nearby OBIS observations8
Holacanthus passer
Nearby OBIS observations6
Scarus rubroviolaceus
Nearby OBIS observations6
Thalassoma lucasanum
Nearby OBIS observations6
Acanthurus nigricans
Nearby OBIS observations5
Bodianus diplotaenia
Nearby OBIS observations5
These are nearby biodiversity records, not a guarantee that every species will be seen on a particular dive.
DeepLog + OBIS →