Aparima River – current water temperature and swimming conditions
This page provides information about the current water temperature at Aparima River 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 Aparima River today is 12°C.
Water Temperature in Aparima River: Daily Trends, Historical Records, and Forecast
⚠️ River water between 10 and 15°C is cold but manageable for short swims, especially on sunny days with warm air temperatures. The moving nature of a river can make the water feel colder than the actual reading, particularly in shaded or deeper sections. Casual swimming is usually brief, with wetsuits often preferred. Windy or cool weather can significantly reduce comfort, even when the air temperature is mild.
Water Temperature Over the Last 30 Days
Over the past 30 days, water temperatures in Aparima River have generally increased, although a slight cooling trend has set in over the last week.
According to our forecast, the water temperature in Aparima River will be 9.9°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 |
|---|---|---|---|
| May 6 | 12.8°C | 9.5°C | |
| May 7 | 12.8°C | 9.5°C | |
| May 8 | 12.9°C | 9.5°C | |
| May 9 | 12.9°C | 9.5°C | |
| May 10 | 11.6°C | 9.5°C | |
| May 11 | 11.6°C | 9.5°C | |
| May 12 | 11.4°C | 9.5°C | |
| May 13 | 12.7°C | 9.5°C | |
| May 14 | 12.3°C | 9.5°C | 12.3°C |
| May 15 | 9.5°C | 12.0°C | |
| May 16 | 9.5°C | 11.6°C | |
| May 17 | 9.5°C | 11.3°C | |
| May 18 | 9.5°C | 10.9°C | |
| May 19 | 9.5°C | 10.6°C | |
| May 20 | 9.5°C | 10.2°C | |
| May 21 | 9.5°C | 9.9°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 New Zealand to improve accuracy.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Today | Yesterday | A Week Ago |
|---|---|---|---|
| January | 11°C | 17°C | 22°C |
| February | 11°C | 18°C | 24°C |
| March | 10°C | 15°C | 20°C |
| April | 6°C | 11°C | 16°C |
| May | 5°C | 10°C | 14°C |
| June | 1°C | 7°C | 12°C |
| July | 2°C | 6°C | 10°C |
| August | 2°C | 7°C | 11°C |
| September | 5°C | 10°C | 14°C |
| October | 7°C | 11°C | 15°C |
| November | 9°C | 14°C | 18°C |
| December | 11°C | 17°C | 22°C |
Aparima River: Water Temperature by Location
Otautau
Aparima River: Weather Forecast
May 15
May 16
May 17
May 18
May 19
Location & Local Information
The Aparima River in the Southland Region flows from the Takitimu Mountains south-westward to the Foveaux Strait near Riverton. With its origins in elevated country and a cool southern climate, the river’s water temperature remains relatively low for much of the year. In winter, temperatures are typically around 5–9°C, particularly in the upper reaches. During spring, snowmelt and regular rainfall keep the river brisk, generally between 7 and 12°C. In summer, especially in January and February, slower stretches and sheltered pools in the lower valley may warm to approximately 13–18°C on fine days. By autumn, temperatures usually ease back to around 8–14°C. Heavy rain in the catchment can quickly lower temperatures and increase river flow.
Swimming Conditions
Swimming is allowed in parts of the Aparima River, and some locals use calmer pools for a dip during settled summer weather. The most comfortable conditions are usually when water temperatures reach the mid to high teens and flows are steady. However, even in summer the river can feel cool, and currents may be stronger in narrower sections. Swimmers should avoid entering the river during high flows or shortly after heavy rain, when water levels rise and clarity may decrease. Checking local conditions before swimming helps ensure a safer experience.