Waihi Beach – current water temperature and swimming conditions

This page shows the current water temperature at Waihi Beach in Bay of Plenty Region. You can view recent sea temperature trends on a 30-day chart, check typical monthly water temperature ranges, and compare today’s reading with historical averages for this date. The page also includes a 7-day water temperature forecast, nearby beaches with similar conditions, local weather information, and a summary of swimming conditions to help you assess how suitable the water is for swimming.

Current Sea Water Temperature

18.9°C

Today

18.9°C

Yesterday

19.0°C

A Week Ago

The average sea water temperature today in Waihi Beach is about 19°C.

Water Temperature in Waihi Beach: Daily Trends, Historical Records, and Forecast

⚠️ Water in this range feels cool but still manageable for many swimmers. Short to moderate swims are comfortable, especially in warm weather. Some people may prefer a wetsuit for longer stays, particularly when swimming actively or outside peak summer conditions.

It’s important to note that these swimming tips and recommendations apply only in settled weather. When air temperatures drop below 20°C — and sometimes even below 25°C — swimming can feel uncomfortable, even when water temperatures are relatively high.

Water Temperature Over the Last 30 Days

From April 14 to May 14

Water temperatures in Waihi Beach have been gradually cooling over the past month, with a further drop recorded during the last week.

According to our forecast, Sea water temperature in Waihi Beach will be 18.6°C in the next 7 days. See the table below for daily data for the upcoming week.

Table of Daily Sea Temperature Data

Date	Current	Average	Forecast
May 6	19.2°C	18.5°C
May 7	18.9°C	18.5°C
May 8	19.0°C	18.3°C
May 9	19.4°C	18.3°C
May 10	19.0°C	18.3°C
May 11	19.1°C	18.8°C
May 12	19.4°C	18.5°C
May 13	18.9°C	18.8°C
May 14	18.9°C	18.8°C	18.9°C
May 15		18.3°C	18.9°C
May 16		18.0°C	18.8°C
May 17		17.8°C	18.8°C
May 18		18.3°C	18.7°C
May 19		17.3°C	18.7°C
May 20		18.5°C	18.7°C
May 21		18.0°C	18.6°C

* Current - Actual water temperature value

** Average - Average water temperature on this day in recent years

*** Forecast - Our water temperature forecast

Actual near-shore water temperatures in Waihi Beach can vary by several degrees from the values shown, particularly after heavy rain, strong southerlies, or prolonged windy conditions. Certain wind patterns can trigger upwelling, where cooler, deeper water is pushed to the surface and replaces the warmer top layer, leading to noticeable short-term changes in water temperature.

Our water temperature forecast is produced using a proprietary mathematical model that combines real-time measurements with long-term historical patterns, local weather conditions, wind strength and direction, and air temperature specific to each coastal region. To improve accuracy, we cross-check data from nearby locations and use multiple sources, including offshore buoys, satellite-based sea surface maps, and observations provided by local authorities.

Annual Water Temperature Overview by Month

Monthly Water Temp Ranges

30°C

25°C

20°C

15°C

10°c

5°C

0°C

Annual Water Temperature Trend

Waihi Beach, on the western edge of the Bay of Plenty, faces the open Pacific Ocean and is known for its long sweep of sand and relatively mild sea temperatures by New Zealand standards. In mid to late summer, particularly from January to March, water temperatures usually range between 19–22°C. At this time of year, many locals and visitors are happy to swim without a wetsuit, especially on calm, sunny days. Through spring and autumn, the ocean generally sits around 16–19°C, which still allows for swimming, though it can feel a bit fresh at first. In winter, temperatures often drop to about 13–15°C, making the water noticeably chilly and better suited to surfers or keen swimmers with thermal gear.

Monthly Water Temperature Range (Min, Max & Average)

Month	Min	Avg	Max
January	18°C	21°C	24°C
February	19°C	22°C	24°C
March	18°C	21°C	23°C
April	18°C	20°C	22°C
May	16°C	18°C	21°C
June	14°C	17°C	19°C
July	13°C	15°C	17°C
August	13°C	15°C	16°C
September	12°C	15°C	17°C
October	13°C	15°C	18°C
November	15°C	17°C	20°C
December	16°C	19°C	22°C

* Click on a month to view detailed water temperature data.

Waihi Beach: Weather Forecast

May 15

9°C / 15°C

clear sky

humidity: 74% | wind: 4 kmh

May 16

8°C / 15°C

clear sky

humidity: 73% | wind: 4 kmh

May 17

10°C / 16°C

scattered clouds: 25-50%

humidity: 69% | wind: 11 kmh

Local Water Conditions and Nearby Spots

Swimming Conditions

Swimming is allowed and popular at Waihi Beach, particularly during the patrolled summer season when lifeguards monitor conditions. However, as with many surf beaches in Aotearoa, waves and rips can develop, especially when there’s a decent swell running. The combination of open-ocean exposure and shifting sandbanks means conditions can change from day to day. On settled days, the beach offers enjoyable swimming and bodyboarding, while warmer summer sea temperatures make longer dips far more comfortable than in the cooler months.