Masterton – current water temperature and swimming conditions
This page provides information about the current water temperature at Masterton 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 Ruamāhanga River at Masterton today is 16°C.
Water Temperature in Ruamāhanga River at Masterton: Daily Trends, Historical Records, and Forecast
⚠️ A river temperature of 15 to 20°C is generally considered cool to comfortable for swimming in Australia. On warm, calm days, this range allows for relaxed swimming and longer time in the water. Comfort depends heavily on air temperature and sunshine, as cooler weather can still make the water feel chilly. This range is popular for river swimming during spring and early autumn.
Water Temperature Over the Last 30 Days
Water temperatures in Masterton have been on a steady rise over the past month and have continued to climb over the last week.
According to our forecast, the water temperature in Masterton will be 17.3°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 |
|---|---|---|---|
| Mar 21 | 15.4°C | 17.5°C | |
| Mar 22 | 15.4°C | 17.5°C | |
| Mar 23 | 15.4°C | 17.5°C | |
| Mar 24 | 15.4°C | 17.5°C | |
| Mar 25 | 15.5°C | 17.5°C | |
| Mar 26 | 15.5°C | 17.5°C | |
| Mar 27 | 15.9°C | 17.5°C | |
| Mar 28 | 16.0°C | 17.5°C | |
| Mar 29 | 16.1°C | 17.5°C | 16.1°C |
| Mar 30 | 17.5°C | 16.3°C | |
| Mar 31 | 17.5°C | 16.5°C | |
| Apr 1 | 17.5°C | 16.6°C | |
| Apr 2 | 17.5°C | 16.8°C | |
| Apr 3 | 17.5°C | 17.0°C | |
| Apr 4 | 17.5°C | 17.2°C | |
| Apr 5 | 17.5°C | 17.3°C |
* Current - Actual water temperature value
** Average - Average water temperature on this day in recent years
*** Forecast - Our water temperature forecast
Actual river water temperatures may vary by several degrees from the reported values, particularly after heavy rainfall or periods of changing weather. Rainfall, river flow rates, and runoff from cooler upstream areas can significantly affect water temperature, especially in flowing sections and shaded stretches. Air temperature and cloud cover also play an important role, with warm, sunny conditions helping rivers warm up more quickly. As a result, noticeable temperature differences can occur along the same river.
Our forecast is based on a proprietary mathematical model that takes into account real-time river temperature changes, historical data, seasonal patterns, river flow conditions, recent rainfall, and local air temperature. We also factor in broader weather conditions specific to each region of Australia to improve accuracy.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Today | Yesterday | A Week Ago |
|---|---|---|---|
| January | 15°C | 20°C | 25°C |
| February | 14°C | 20°C | 25°C |
| March | 12°C | 18°C | 23°C |
| April | 9°C | 14°C | 19°C |
| May | 7°C | 11°C | 15°C |
| June | 6°C | 10°C | 14°C |
| July | 5°C | 8°C | 11°C |
| August | 6°C | 10°C | 13°C |
| September | 6°C | 12°C | 17°C |
| October | 7°C | 13°C | 18°C |
| November | 9°C | 16°C | 23°C |
| December | 11°C | 17°C | 22°C |
Masterton: Weather Forecast
March 30
March 31
April 1
April 2
April 3
April 4
Location & Local Information
Masterton, located in the Wairarapa of the Wellington Region, sits close to the middle reaches of the Ruamāhanga River. In this lowland section, water temperatures reflect seasonal air conditions rather than alpine snowmelt. During winter, the river near Masterton is generally cool, with temperatures around 8–12°C. In spring, readings typically rise to between 12 and 16°C as days become milder. Over summer, especially in January and February, calmer pools and wider stretches can warm to approximately 18–23°C on settled, sunny days. By autumn, temperatures usually ease back to around 13–17°C. Heavy rainfall in the Tararua Ranges can temporarily lower temperatures and increase river flow.
Swimming Conditions
Swimming is allowed in suitable parts of the Ruamāhanga River near Masterton, and locals often visit established swimming spots during the warmer months. The most comfortable conditions are generally in mid to late summer when water temperatures approach or exceed 18°C and river levels are steady. However, swimmers should be aware of changing depths, submerged debris and moderate currents in some sections. It is advisable to avoid entering the river after significant rainfall, when flows can rise quickly and water clarity may decrease. Checking regional water quality information before swimming is recommended to ensure safe conditions.