Lake Monowai – current water temperature and swimming conditions
This page provides information about the current water temperature at Lake Monowai in Southland 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 Monowai today is 7°C.
Water Temperature in Lake Monowai: Daily Trends, Historical Records, and Forecast
❌ Lake water below 10°C is extremely cold and generally unsuitable for swimming for most people. Even during warm weather, deep lakes retain cold water, making entry uncomfortable and limiting time in the water. Swimming at this temperature is usually limited to quick dips or cold-water enthusiasts. Cool air temperatures or cloudy conditions can make lake swimming particularly harsh.
Water Temperature Over the Last 30 Days
Water temperatures in Lake Monowai have been gradually cooling over the past month, with a further drop recorded during the last week.
According to our forecast, the water temperature in Lake Monowai will be 9.3°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 |
|---|---|---|---|
| Aug 19 | 13.0°C | 9.6°C | |
| Aug 20 | 13.2°C | 9.6°C | |
| Aug 21 | 13.2°C | 9.6°C | |
| Aug 22 | 12.9°C | 9.6°C | |
| Aug 23 | 13.0°C | 9.6°C | |
| Aug 24 | 13.0°C | 9.6°C | |
| Aug 25 | 7.4°C | 9.6°C | |
| Aug 26 | 7.4°C | 9.6°C | |
| Aug 27 | 7.4°C | 9.6°C | 7.4°C |
| Aug 28 | 9.6°C | 7.7°C | |
| Aug 29 | 9.6°C | 8.0°C | |
| Aug 30 | 9.6°C | 8.2°C | |
| Aug 31 | 9.6°C | 8.5°C | |
| Sep 1 | 9.6°C | 8.8°C | |
| Sep 2 | 9.6°C | 9.1°C | |
| Sep 3 | 9.6°C | 9.3°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 New Zealand.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Today | Yesterday | A Week Ago |
|---|---|---|---|
| January | 13°C | 18°C | 23°C |
| February | 13°C | 18°C | 23°C |
| March | 11°C | 16°C | 20°C |
| April | 10°C | 14°C | 17°C |
| May | 9°C | 12°C | 15°C |
| June | 5°C | 9°C | 12°C |
| July | 5°C | 8°C | 10°C |
| August | 5°C | 8°C | 11°C |
| September | 6°C | 9°C | 12°C |
| October | 7°C | 11°C | 14°C |
| November | 9°C | 13°C | 16°C |
| December | 10°C | 15°C | 20°C |
Location & Local Information
Lake Monowai, in the Southland Region west of Tuatapere, is a long, narrow lake surrounded by forested hills and part of a hydro-electric scheme. Fed by rainfall and upland streams, its water temperature reflects the cool southern climate. In winter, surface temperatures are generally around 6–9°C. During spring, ongoing rain and snowmelt from nearby ranges keep the lake brisk, typically between 8 and 12°C. In summer, particularly in January and February, near-shore areas may warm to approximately 13–18°C on calm, sunny days, while deeper water remains colder. By autumn, temperatures usually ease back to between 9 and 14°C. Weather changes can quickly influence surface conditions.
Swimming Conditions
Swimming is allowed at Lake Monowai, though it is more commonly visited for boating and fishing. The most comfortable time for a swim is usually in mid to late summer when water temperatures approach the high teens and winds are light. Even then, the water can feel cool compared with northern lakes. Swimmers should choose sheltered shoreline areas and avoid entering the lake during strong winds, when conditions can become choppy. Checking weather conditions beforehand helps ensure a safer and more enjoyable freshwater experience.