Month-specific sea-surface temperature · Australia

Jervis Bay Sea Temperature in January

21.3°C

70.3°F

In January, sea-surface temperature near Jervis Bay has a historical monthly average of 21.3°C. This is not the reading for any particular holiday date.

Across 2023–2025, the lowest and highest yearly January monthly means were 20.8–21.9°C. These are not daily extremes.

Previous month

December · 20.3°C

Change into January: +1.0°C

Next month

February · 22.7°C

Change into next month: +1.4°C

Can you swim or snorkel in Jervis Bay in January?

At 21.3°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 January. Check again close to your trip.

Waves and wind: recorded-model conditions for January

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.

Morning calm hours

Afternoon calm hours

Historical coverage

January 2026

31 valid days

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.

Jervis Bay Sea Temperature: All 12 Months

Choose a month for available historical evidence, month comparisons and swim guidance. Missing history is clearly marked and never presented as a long-term normal.

January 21.3°C February 22.7°C March 22.3°C April 21.8°C May 20.7°C June 19.0°C July 17.4°C August 17.3°C September 17.8°C October 18.8°C November 19.0°C December 20.3°C

Data source and limitations

Source: Open-Meteo Marine API, MeteoFrance sea-surface temperature; 2023–2025. Marine model grid near -35.10, 150.73. Based on 3 yearly monthly means and 2166 recorded samples. Source methodology.

Modelled sea-surface temperatures do not establish underwater visibility, wildlife, calm currents or safe entry.