Lake Ōnoke – current water temperature and swimming conditions
This page provides information about the current water temperature at Lake Ōnoke in Wellington Region. Here you can view recent temperature trends on a 30-day chart, check typical monthly water temperature ranges, and compare today’s reading with historical averages for this date. A 7-day water temperature forecast, local weather conditions, and an overview of swimming suitability are also included.
Current Water Temperature
The water temperature in Lake Ōnoke today is 18°C.
Water Temperature in Lake Ōnoke: Daily Trends, Historical Records, and Forecast
⚠️ A lake temperature of 15 to 20°C is considered cool to comfortable for swimming in Australia. On warm days with light winds, this range allows for relaxed swimming, especially in shallow or sheltered areas. Comfort depends strongly on air temperature and sunshine, as cooler or overcast weather can still make the water feel chilly. This range is common during spring and early summer.
Water Temperature Over the Last 30 Days
While water temperatures in Lake Ōnoke declined overall during the past month, they have shown a noticeable rebound over the last week.
According to our forecast, the water temperature in Lake Ōnoke will be 15.8°C in the next 7 days. See the table below for daily data for the upcoming week.
Table of Daily Water Temperature Data
| Date | Current | Average | Forecast |
|---|---|---|---|
| Mar 22 | 17.4°C | 15.5°C | |
| Mar 23 | 17.4°C | 15.5°C | |
| Mar 24 | 17.3°C | 15.5°C | |
| Mar 25 | 17.3°C | 15.5°C | |
| Mar 26 | 17.5°C | 15.5°C | |
| Mar 27 | 17.5°C | 15.5°C | |
| Mar 28 | 17.7°C | 15.5°C | |
| Mar 29 | 17.7°C | 15.5°C | |
| Mar 30 | 18.0°C | 15.5°C | 18.0°C |
| Mar 31 | 15.5°C | 17.7°C | |
| Apr 1 | 15.5°C | 17.4°C | |
| Apr 2 | 15.5°C | 17.1°C | |
| Apr 3 | 15.5°C | 16.8°C | |
| Apr 4 | 15.5°C | 16.4°C | |
| Apr 5 | 15.5°C | 16.1°C | |
| Apr 6 | 15.5°C | 15.8°C |
* Current - Actual water temperature value
** Average - Average water temperature on this day in recent years
*** Forecast - Our water temperature forecast
Actual lake water temperatures may differ from the reported values by several degrees, particularly during periods of strong winds or rapid weather changes. Wind can mix surface and deeper layers in a lake, bringing cooler water to the surface, while shallow areas may warm more quickly under direct sunlight. Air temperature, sunshine, and cloud cover strongly influence how quickly a lake heats up or cools down. These factors can lead to noticeable temperature variations across different parts of the lake.
Our forecast is based on a proprietary mathematical model that considers real-time lake temperature observations, historical trends, seasonal cycles, wind strength and direction, and region-specific air temperature. To enhance accuracy, we also incorporate data from nearby monitored locations and comparable lakes within Australia.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Today | Yesterday | A Week Ago |
|---|---|---|---|
| January | 11°C | 17°C | 22°C |
| February | 12°C | 17°C | 22°C |
| March | 10°C | 16°C | 21°C |
| April | 8°C | 12°C | 16°C |
| May | 7°C | 11°C | 15°C |
| June | 5°C | 10°C | 14°C |
| July | 4°C | 8°C | 11°C |
| August | 5°C | 9°C | 12°C |
| September | 5°C | 10°C | 14°C |
| October | 6°C | 13°C | 19°C |
| November | 6°C | 12°C | 18°C |
| December | 9°C | 14°C | 19°C |
Lake Ōnoke: Weather Forecast
March 30
March 31
April 1
April 2
April 3
Location & Local Information
Lake Ōnoke, in the Wellington Region at the southern end of the Wairarapa, is a large coastal lagoon connected to Palliser Bay. It is shallow and strongly influenced by tides, wind and freshwater inflows from Lake Wairarapa. Water temperatures reflect seasonal air conditions and the mixing of fresh and salt water. In winter, surface temperatures are generally around 9–13°C. During spring, the lake gradually warms to approximately 13–17°C. In summer, particularly in January and February, shallow areas may reach about 18–23°C on warm, settled days, although tidal exchange can cause local variations. By autumn, temperatures usually ease back to between 13 and 17°C. Strong winds can quickly mix the water and affect comfort levels.
Swimming Conditions
Swimming is allowed at Lake Ōnoke, but it is not widely regarded as a prime swimming destination. While summer temperatures may feel comfortable when above 18°C, tidal currents near the outlet and variable water clarity require caution. The lake is more commonly used for boating, fishing and birdwatching. Anyone considering swimming should choose calm days, avoid the tidal channel and check local conditions beforehand. For most visitors, Lake Ōnoke is appreciated for its coastal scenery rather than recreational swimming.