Castle Rock scuba diving weather

Boat dive · Portsea, Victoria · Show on map

Now · 02:00Fair

46out of 100

Limited by surge. Best 07:00–11:00. From 12:00 surge builds and it's a no-go.

Waves: 1.3 m
Wind: 6 kn from W; gusts 11
Water: 17 °C; warm to ~31 m
Suit: 7 mm; to ~20 m

Tide High ~04:17 · Low ~10:06 · Bigger tides · approximate

Hour by hour today

Tap an hour to see it above

Score	Waves	Wind (gusts)	Current	Swell	Tide	Water	Air	Rain	Limited by
46	1.3 m	6 (11 kn) ↓	0.4 kn	0.9 m · 10 s ↓	–	16.5 °C	12 °C	–	surge
45	1.3 m	7 (12 kn) ↓	0.3 kn	0.9 m · 10 s ↓	–	16.5 °C	11 °C	–	surge
44	1.3 m	7 (12 kn) ↓	0.3 kn	0.9 m · 10 s ↓	High ~04:17	16.5 °C	11 °C	–	surge
45	1.2 m	8 (13 kn) ↓	0.2 kn	0.9 m · 10 s ↓	↓ falling	16.5 °C	11 °C	–	surge
39	1.2 m	9 (14 kn) ↓	0.1 kn	1.0 m · 10 s ↓	↓ falling	16.5 °C	11 °C	–	surge
35	1.2 m	9 (16 kn) ↓	0.1 kn	1.1 m · 9 s ↓	↓ falling	16.5 °C	11 °C	–	surge
29	1.2 m	9 (17 kn) ↓	0.1 kn	1.2 m · 9 s ↓	↓ falling	16.5 °C	13 °C	–	surge
27	1.3 m	10 (20 kn) ↓	0.2 kn	1.2 m · 9 s ↓	↓ falling	16.5 °C	14 °C	–	surge
26	1.3 m	10 (22 kn) ↓	0.3 kn	1.2 m · 9 s ↓	Low ~10:06	16.5 °C	15 °C	0.2 mm	surge
22	1.3 m	10 (22 kn) ↓	0.3 kn	1.2 m · 9 s ↓	↑ rising	16.5 °C	16 °C	0.2 mm	surge
16	1.4 m	12 (24 kn) ↓	0.4 kn	1.2 m · 9 s ↓	↑ rising	16.5 °C	15 °C	0.2 mm	surge
12	1.4 m	14 (26 kn) ↓	0.5 kn	1.2 m · 10 s ↓	↑ rising	16.5 °C	15 °C	0.4 mm	surge
8	1.5 m	15 (29 kn) ↓	0.5 kn	1.2 m · 10 s ↓	↑ rising	16.5 °C	15 °C	0.1 mm	surge
8	1.6 m	15 (29 kn) ↓	0.3 kn	1.1 m · 10 s ↓	High ~15:56	16.5 °C	14 °C	0.1 mm	surge
6	1.7 m	16 (31 kn) ↓	0.2 kn	1.1 m · 10 s ↓	↓ falling	16.5 °C	14 °C	0.1 mm	surge
5	1.7 m	17 (32 kn) ↓	0.2 kn	1.1 m · 10 s ↓	↓ falling	16.5 °C	14 °C	–	surge
3	1.8 m	17 (32 kn) ↓	0.3 kn	1.1 m · 10 s ↓	↓ falling	16.5 °C	13 °C	–	surge
2	1.9 m	16 (31 kn) ↓	0.3 kn	1.2 m · 11 s ↓	↓ falling	16.5 °C	13 °C	–	surge
1	2.0 m	15 (30 kn) ↓	0.3 kn	1.2 m · 11 s ↓	↓ falling	16.5 °C	12 °C	–	surge
0	2.0 m	14 (26 kn) ↓	0.2 kn	1.2 m · 10 s ↓	↓ falling	16.5 °C	11 °C	0.1 mm	surge

Waves and swell are adjusted for this site's shelter from the coastline. Arrows point where the wind and swell go. Night hours are shaded. Tide times come from an ocean model: usually within about half an hour, more in complex waters. Check official tide tables.

Water at depth

16 °C at the surface, warm to about 31 m.

0–20 m 7 mm or semi-dry (down to 16.4 °C)
20–40 m 7 mm with hood, or drysuit (down to 15.4 °C)

Model estimate (Copernicus Marine), updated Sat 14 Nov. High confidence.

Temperature profile and next days

Day	Surface	Warm to
Sun 15 Nov	16.4 °C	~31 m
Mon 16 Nov	16.4 °C	~35 m
Tue 17 Nov	16.5 °C	~32 m
Wed 18 Nov	16.5 °C	~29 m
Thu 19 Nov	17.0 °C	~7 m
Fri 20 Nov	17.8 °C	~2 m
Sat 21 Nov	17.5 °C	~8 m
Sun 22 Nov	17.6 °C	~6 m
Mon 23 Nov	16.8 °C	~35 m

~9 km model grid; nearest model water 3.6 km away, so channels and bays may differ. Daily averages; the thermocline can move several metres day to day.

Conditions at Castle Rock

Castle Rock is open to the sea from the ENE–E, SE–WSW, so waves build there when the wind blows from those directions. Land shelters it from the NNW–NE.

Over the next 7 days no day looks good: Mon, Tue and Wed are a no-go (surge). Thu, Fri and Sat are only a trend so far.

When it's rough here, try Portsea Pier (10 km, sheltered from the SE–WSW).

The water is 17 °C at the surface and warm to about 31 m, so a 7 mm or semi-dry suits most dives.

Shelter

Open to ENE–E, SE–WSW. Waves and swell from there reach the site.

Sheltered from NNW–NE: land blocks the waves.

Computed from the OpenStreetMap coastline. Wind itself is not reduced by shelter.

Location

Open Castle Rock on the map-38.2983, 144.5978

Nearby dive sites

Scores are today's best daylight hour.

About this forecast

Updated Sun 15 Nov, 02:30 · weather run 06Z 14 Nov · waves run 00Z 14 Nov

Waves are adjusted for this site's shelter from the coastline.

Tides come from a coarse ocean model. The range, and whether tides are bigger or smaller this week, are about right. Times are usually within about half an hour, but complex tides (the Solent, Portland, narrow straits) are poor. Slack water isn't in the score yet: plan with official tide tables and local advice.

Water temperature in Victoria

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