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IntermediateBoat entry

Brother Jonathan Wreck

California, United States
Depth of about 84 m, far beyond recreational limits; frigid Northern California water; the area is exposed to severe storms84 m (276 ft) depthBoat entry7mm or semi-dry + hood typical

Boat dive — see Entry & access.

Brother Jonathan Wreck at a glance

Brother Jonathan Wreck is an intermediate boat dive site in California, United States with depths of up to 84 m (276 ft). Typically most favorable Aug · from 3 years of archive data. Recent reports put the water around 12°C (53°F). Check the latest conditions and entry details before you go.

No window today· next: tomorrow 8:00–19:00 · favorable

Forecast for this hour · 21:00 · run 10 h ago
2.1 m (7.0 ft)waves — about two meters expected (waves — about seven feet expected)

Tap a factor for its source and model point · Forecast 12°C · seasonal avg 12°C ( · Forecast 53°F · seasonal avg 54°F)

Site hazards: Depth of about 84 m, far beyond recreational limits; frigid Northern California water; the area is exposed to severe storms

Read the full hazards ↓

Dive windows this week

SunNo window

1.3 m waves · 11 kn wind (4.3 ft waves · 11 kn wind)

Mon8:00–19:00 favorable

2.2 m waves · 8 kn wind (7.1 ft waves · 8 kn wind)

Tue8:00–14:00 favorable, 14:00–15:00 moderate, 15:00–18:00 favorable, 18:00–19:00 moderate

1.6 m waves · 12 kn wind (5.2 ft waves · 12 kn wind)

Wed8:00–19:00 favorable

1.8 m waves · 3 kn wind (5.7 ft waves · 3 kn wind)

Thu8:00–19:00 favorable

1.8 m waves · 6 kn wind (5.9 ft waves · 6 kn wind)

Fri8:00–19:00 favorable

1.4 m waves · 3 kn wind (4.5 ft waves · 3 kn wind)

Sat8:00–19:00 favorable

1.5 m waves · 2 kn wind (4.8 ft waves · 2 kn wind)

Favorable windowModerate window— no window

Every forecast dive window each day, site-local time, from wave and wind forecasts. Numbers under each bar are daylight averages.

First light 7:13 · Sunrise 7:41 · Sunset 18:21 · some windows run past sunset

Source: Open-Meteo marine · model point 5.0 km from site · updated 25 Oct, 10:20 GMT-7

Forecast only — always assess conditions on site.

Compare this weekend’s windows near Brother Jonathan Wreck

Forecast · NOAA tide model

Tide & slack timing

Loading tide predictions

Recent diver reports

Dated firsthand observations from divers — not current conditions.

No diver reports for this site yet. — one dated observation helps every diver after you.

Dived here today — did the forecast match?

Best months, historically

What conditions have historically been typical at this site, month by month — not a forecast.

  1. January, 3% of days have historically been favorable, water has typically been 12°C (53°F), waves have typically been 3.7 m (12.2 ft), wind has typically been 24 knots
  2. February, 1% of days have historically been favorable, water has typically been 11°C (51°F), waves have typically been 3.7 m (12.0 ft), wind has typically been 23 knots
  3. March, 1% of days have historically been favorable, water has typically been 10°C (51°F), waves have typically been 3.4 m (11.2 ft), wind has typically been 24 knots
  4. April, 2% of days have historically been favorable, water has typically been 10°C (51°F), waves have typically been 2.8 m (9.0 ft), wind has typically been 24 knots
  5. May, 4% of days have historically been favorable, water has typically been 10°C (51°F), waves have typically been 2.4 m (8.0 ft), wind has typically been 26 knots
  6. June, 8% of days have historically been favorable, water has typically been 10°C (50°F), waves have typically been 2.6 m (8.4 ft), wind has typically been 28 knots
  7. July, 13% of days have historically been favorable, water has typically been 11°C (51°F), waves have typically been 2.2 m (7.3 ft), wind has typically been 27 knots
  8. August, 20% of days have historically been favorable, water has typically been 12°C (54°F), waves have typically been 1.9 m (6.3 ft), wind has typically been 22 knots, historically most favorable
  9. September, 12% of days have historically been favorable, water has typically been 13°C (55°F), waves have typically been 2.4 m (7.9 ft), wind has typically been 23 knots
  10. October, 5% of days have historically been favorable, water has typically been 12°C (54°F), waves have typically been 2.9 m (9.4 ft), wind has typically been 20 knots
  11. November, 2% of days have historically been favorable, water has typically been 13°C (55°F), waves have typically been 3.4 m (11.1 ft), wind has typically been 21 knots
  12. December, 2% of days have historically been favorable, water has typically been 13°C (55°F), waves have typically been 3.5 m (11.4 ft), wind has typically been 21 knots

August has typically had the largest share of favorable days here. Conditions vary year to year — this is historical context, not a forecast.

Based on 3 years of archive data. Bar height shows the share of days each month whose conditions have historically scored favorably.

Marine life recorded at this site

No recorded sightings data for this site yet. Species lists appear as GBIF records and diver reports accumulate.

Fills & rentals nearby

No dive shops mapped within 25 km (16 mi). Know one? Add it to the map.

Data updated June 2026

Site details

paddle steamer

wreck

Depth of about 84 m, far beyond recreational limits; frigid Northern California water; the area is exposed to severe storms — the ship itself was lost in a fierce northwesterly gale; darkness at depth and a remote offshore location compound the risk. The wreck is a state-owned, government-protected historic site on the National Register, and salvage operations have ended.

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