Goat Island Water Temperature
Updated Wed 04:50 (Pacific/Auckland)
New Zealand · Forecast updated Sep 23, 2026, 04:50 UTC
Current Sea Temperature
15.3°C
59.5°F
Cold water
Valid Sep 23, 2026, 04:50 (Pacific/Auckland). Source: stored Open-Meteo marine forecast. Temperature is not a safety rating or snorkel score.
Versus this month's average
0.3°C above
The typical September average is 15.0°C (59.0°F) from the historical baseline.
Recent trend
Warming by 0.3°C
Seven-day average: 15.3°C, versus 15.0°C in the prior seven days.
What to wear
Cold water
Use a full 3-5 mm wetsuit and keep the session within your cold-water experience.
Cold tolerance varies. Wind, session length, sunshine, and exertion also affect comfort; temperature alone does not describe sea conditions or replace the snorkel forecast.
Typical Sea Temperature Over the Year
In the historical baseline for Goat Island, typical monthly averages range from about 13.8°C (56.8°F) in August to 22.4°C (72.3°F) in February.
Over the past 30 days, the average sea temperature in Goat Island has been 14.9°C.
Historical baseline (full year)
Southern Hemisphere. Summer is generally December–February; winter is June–August.
Typical monthly sea-surface temperature near Goat Island, calculated from hourly observations for 2023–2025. This is not this site's forecast archive.
| Month | Typical range | Average |
|---|---|---|
| January | 21.0–22.9°C | 21.9°C / 71.4°F |
| February | 22.0–22.8°C | 22.4°C / 72.3°F |
| March | 20.7–22.0°C | 21.4°C / 70.5°F |
| April | 19.0–20.4°C | 19.7°C / 67.5°F |
| May | 16.8–18.5°C | 17.7°C / 63.9°F |
| June | 15.5–16.6°C | 16.0°C / 60.8°F |
| July | 14.2–15.5°C | 14.7°C / 58.5°F |
| August | 13.4–14.1°C | 13.8°C / 56.8°F |
| September | 14.8–15.2°C | 15.0°C / 59.0°F |
| October | 16.1–16.8°C | 16.4°C / 61.5°F |
| November | 18.3–19.8°C | 18.8°C / 65.8°F |
| December | 20.0–21.3°C | 20.8°C / 69.4°F |
Source: Open-Meteo Marine API, MeteoFrance sea-surface temperature dataset. Nearest sea grid cell (-36.29, 174.88). Each month is the mean of yearly monthly means; the range is the lowest and highest of those yearly monthly means. Open-Meteo methodology.
Water temperature by month
Each month uses the 2023–2025 baseline. The range is the lowest and highest yearly monthly mean, not an hourly extreme.
Goat Island in January
Typical January water temperature near Goat Island is 21.9°C (71.4°F), with yearly monthly means from 21.0–22.9°C.
Goat Island in February
Typical February water temperature near Goat Island is 22.4°C (72.3°F), with yearly monthly means from 22.0–22.8°C.
Goat Island in March
Typical March water temperature near Goat Island is 21.4°C (70.5°F), with yearly monthly means from 20.7–22.0°C.
Goat Island in April
Typical April water temperature near Goat Island is 19.7°C (67.5°F), with yearly monthly means from 19.0–20.4°C.
Goat Island in May
Typical May water temperature near Goat Island is 17.7°C (63.9°F), with yearly monthly means from 16.8–18.5°C.
Goat Island in June
Typical June water temperature near Goat Island is 16.0°C (60.8°F), with yearly monthly means from 15.5–16.6°C.
Goat Island in July
Typical July water temperature near Goat Island is 14.7°C (58.5°F), with yearly monthly means from 14.2–15.5°C.
Goat Island in August
Typical August water temperature near Goat Island is 13.8°C (56.8°F), with yearly monthly means from 13.4–14.1°C.
Goat Island in September
Typical September water temperature near Goat Island is 15.0°C (59.0°F), with yearly monthly means from 14.8–15.2°C.
Goat Island in October
Typical October water temperature near Goat Island is 16.4°C (61.5°F), with yearly monthly means from 16.1–16.8°C.
Goat Island in November
Typical November water temperature near Goat Island is 18.8°C (65.8°F), with yearly monthly means from 18.3–19.8°C.
Goat Island in December
Typical December water temperature near Goat Island is 20.8°C (69.4°F), with yearly monthly means from 20.0–21.3°C.
Forecast archive (growing)
These values come from hourly forecasts SnorkelForecast has stored. They cover only months with records and do not replace the historical baseline.
| Month | Min | Average | Max |
|---|---|---|---|
| June | 14.9°C / 58.8°F | 16.2°C / 61.1°F | 17.6°C / 63.7°F |
| July | 13.8°C / 56.8°F | 14.5°C / 58.1°F | 15.6°C / 60.1°F |
| August | 13.0°C / 55.4°F | 13.9°C / 56.9°F | 14.6°C / 58.3°F |
| September | 14.4°C / 57.9°F | 15.1°C / 59.1°F | 15.6°C / 60.1°F |
Partial coverage: 4 calendar months with records. Profile calculated from 2748 hourly forecast records across 4 monthly periods. This is a growing archive, not a long-term climate normal.
About the water at Goat Island
New Zealand's first marine reserve, with snapper and kelp in clear shallows.
- Area
- Auckland
Goat Island Water Temperature: Common Questions
What is the water temperature in Goat Island today?
The current sea surface temperature near Goat Island is 15.3°C (59.5°F). Over the last 30 days, the average has been 14.9°C.
When is the water warmest in Goat Island?
The water is typically warmest in February, at around 22.4°C (72.3°F) in the 2023–2025 historical baseline.
When is the water coldest in Goat Island?
The water is typically coldest in August, at around 13.8°C (56.8°F) in the same historical baseline. A wetsuit is usually recommended during this period.
Can you swim in Goat Island today?
At 15.3°C the water is cold. A thick wetsuit is strongly recommended.
Full Snorkeling Forecast
See how today's sea temperature, wave height, wind, and tides combine into a detailed snorkeling score for Goat Island.
View Snorkel Forecast →