Long Bay Water Temperature & Swim Forecast
Popular North Island beach near Auckland.
Cool water with a light chop and a light breeze — tough conditions for unprotected swimming.
Model estimate · modelled, not a buoy measurement. How accurate is this?
Location
Long Bay on the map, with nearby beaches and live sea temperatures.
7-day forecast
Water, air, waves, wind and UV outlook for the week ahead.
4/3mm fullsuit
At 13.6°C you need a 4/3mm fullsuit, and many surfers add neoprene boots.
- + Optional 3mm boots
Recommendation tuned for Long Bay's current water temperature. Individual tolerance, wind chill, and session length all matter — when in doubt, size up.
Long Bay swimming conditions summary
- Water temperature
- 13.6°C
- Water feels
- Bracing
- Swimmable today
- Only with thermal protection
- Swim conditions score
- 51/100 · Fair
- Wetsuit needed
- 4/3mm fullsuit
- Air temperature
- —
- Waves
- —
- Wind
- —
- UV index
- —
- Average sea temperature (September)
- 14.0 °C
- Warmest months to swim
- January, February, March
At 13.6°C you need a 4/3mm fullsuit, and many surfers add neoprene boots. Model estimate. Water, wave, wind and UV values are Open-Meteo marine/weather model estimates, refreshed hourly — not buoy measurements.
Frequently asked questions
Can I swim at Long Bay right now?
The sea at Long Bay is currently 13.6°C — cold swimming conditions. Most swimmers will find the water comfortable when it's above 22°C; below 18°C feels fresh and a wetsuit is recommended.
What will the sea temperature be at Long Bay next week?
Based on long-term September averages and the latest marine model, expect the sea around Long Bay to sit close to 14.7°C over the next 7 days. Check the live 7-day chart above for the exact daily outlook.
When is the best month to swim at Long Bay?
January – February – March are typically the warmest months to swim at Long Bay, with sea temperatures at their seasonal peak.
Do I need a wetsuit at Long Bay?
With water currently at 13.6°C: above 22°C no wetsuit needed; 18–22°C a shorty is comfortable for long swims; 14–18°C a 3/2mm full suit; below 14°C a 4/3mm or thicker.
Can I swim at Long Bay today?
The sea is currently 13.6°C — fair swimming conditions. Acclimatised swimmers will be most comfortable.
- • Located in North Island, New Zealand (Tasman Sea).
- • Family friendly with calm, accessible water.
- • Live data refreshed hourly from Open-Meteo Marine.
Monthly sea temperature averages
Tap any month to see what to expect — based on regional climatology.
Best time to swim in Long Bay
The sea in Long Bay peaks in January, when the water averages around 20°C.
The main swimming season runs from January – February, when surface temperatures stay comfortable for extended sessions.
On average, 2 months a year sit above 20°C — the threshold most swimmers describe as pleasant without a wetsuit.
Shoulder months like December and March are noticeably cooler but often quieter, with fewer crowds and steadier weather.
Outside peak season the water drops toward 13°C, so a 3/2mm shorty or full wetsuit makes long swims much more comfortable.
The coldest month is typically August at around 13°C, when cold-water swimmers dominate the coast.
Long Bay sits in the Southern Hemisphere, so the warmest sea coincides with the December–February summer and the coolest with July–August.
Long Bay sea temperature history
Long-term climatology for Long Bay shows an annual mean sea temperature of 17°C, ranging from 13°C in winter to 20°C at the summer peak.
The seasonal swing is roughly 7°C between the coldest and warmest month — a useful yardstick when comparing years or checking whether the current sea is running above or below average.
Recent decades have trended slightly warmer at Long Bay, in line with regional sea-surface temperature records for the wider basin.
Monthly averages below are drawn from multi-decadal climatology and are updated as new observations arrive.
Long Bay sea temperature: frequently asked questions
What is the warmest month to swim in Long Bay?
January is the warmest month in Long Bay, when the sea averages about 20°C. Late-season warmth often persists a few weeks after peak.
When is the sea coldest in Long Bay?
The coldest month in Long Bay is typically August, when the water averages around 13°C. Cold-water swimmers and surfers dominate this period.
When can you swim in Long Bay without a wetsuit?
The main swimming season in Long Bay runs from January – February — about 2 months a year when the sea sits above 20°C, the level most swimmers describe as pleasant without a wetsuit.
Do I need a wetsuit in Long Bay?
Outside peak summer the water in Long Bay drops toward 13°C, so a 3/2mm shorty or full wetsuit makes long swims much more comfortable. In peak months most swimmers go without.
What is the average sea temperature in Long Bay?
The long-term annual mean sea temperature in Long Bay is about 17°C, based on multi-decadal climatology of the surrounding waters.
How do I check the current sea temperature in Long Bay?
The live reading at the top of this page shows the current sea temperature in Long Bay, updated hourly from marine buoy and satellite data. The 7-day forecast covers water, air, waves, wind and UV for the week ahead.
Year-round sea temperature
Best swim months: Jan – Feb
| Month | Sea | Comfort |
|---|---|---|
| Jan ⭐ | 20°C | Pleasant |
| Feb | 20°C | Pleasant |
| Mar | 19°C | Pleasant |
| Apr | 18°C | Pleasant |
| May | 16°C | Bracing |
| Jun | 15°C | Bracing |
| Jul | 14°C | Bracing |
| Aug | 13°C | Cold |
| Sep | 14°C | Bracing |
| Oct | 15°C | Bracing |
| Nov | 17°C | Bracing |
| Dec | 19°C | Pleasant |
Nearby beaches
The closest coastline, with live water temperatures.