Month-specific sea-surface temperature · USA
Catalina Island Sea Temperature in June
18.8°C
65.8°F
In June, sea-surface temperature near Catalina Island has a historical monthly average of 18.8°C. This is not the reading for any particular holiday date.
Across 2023–2025, the lowest and highest yearly June monthly means were 17.7–19.3°C. These are not daily extremes.
Previous month
May · 16.8°C
Change into June: +2.0°C
Next month
July · 20.3°C
Change into next month: +1.5°C
Can you swim or snorkel in Catalina Island in June?
At 18.8°C our temperature-only guide describes the water as cool water. Comfort depends on your cold tolerance, immersion time and wind. A historical average cannot determine whether conditions are safe on any given day.
Do you need a wetsuit?
A 3 mm shorty or full wetsuit will make longer snorkels more comfortable.
Which beach should you choose?
Look for a beach sheltered from the actual forecast waves and wind on your visit. Exposure, currents and entry conditions vary even where water temperatures are similar. Follow local warnings.
Check the current waves, wind and snorkeling forecast →
A live forecast does not predict a future June. Check again close to your trip.
Waves and wind: recorded-model conditions for June
These figures come from a separately modelled, date-specific wind/wave backfill, not the NOAA SST series. A single observed season is not a climatological likelihood or a guarantee of safe conditions.
Compare nearby coasts with their own evidence
| Coast | Morning | Afternoon | Period |
|---|---|---|---|
| Dry Tortugas | 65% | 63% | Jun 2026 |
| Looe Key | 65% | 61% | Jun 2026 |
| Bahia Honda | 73% | 64% | Jun 2026 |
| Key Largo | 95% | 79% | Jun 2026 |
A “calm hour” meets fixed modelled wave/wind thresholds; neither visibility nor local currents, entry conditions or actual beach safety is measured here. Periods may differ by coast.
Nearby places in June
Comparable historical averages from independent marine grid cells. Warmer water does not imply safe snorkeling.
- La Jolla Cove 19.2°C
Data source and limitations
Source: Open-Meteo Marine API, MeteoFrance sea-surface temperature; 2023–2025. Marine model grid near 33.39, -118.42. Based on 3 yearly monthly means and 2160 recorded samples. Source methodology.
Modelled sea-surface temperatures do not establish underwater visibility, wildlife, calm currents or safe entry.