Cromwell – current water temperature and swimming conditions
This page provides information about the current water temperature at Cromwell in Otago 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 Clutha River at Cromwell today is 6°C.
Water Temperature in Clutha River at Cromwell: Daily Trends, Historical Records, and Forecast
❌ River water below 10°C is very cold and generally unsuitable for swimming for most people. Even on a warm day, rivers at this temperature can quickly cause cold shock and numbness due to flowing water and shaded banks. Swimming is usually limited to brief cold dips or experienced cold-water swimmers. Overcast weather or cool air temperatures make river swimming especially uncomfortable and potentially unsafe.
Water Temperature Over the Last 30 Days
Water temperatures in Cromwell 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 Cromwell will be 9.8°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 |
|---|---|---|---|
| Aug 19 | 13.2°C | 10.3°C | |
| Aug 20 | 13.3°C | 10.3°C | |
| Aug 21 | 13.4°C | 10.3°C | |
| Aug 22 | 12.5°C | 10.3°C | |
| Aug 23 | 12.6°C | 10.3°C | |
| Aug 24 | 12.6°C | 10.3°C | |
| Aug 25 | 6.1°C | 10.3°C | |
| Aug 26 | 6.1°C | 10.3°C | |
| Aug 27 | 6.1°C | 10.3°C | 6.1°C |
| Aug 28 | 10.3°C | 6.6°C | |
| Aug 29 | 10.3°C | 7.2°C | |
| Aug 30 | 10.3°C | 7.7°C | |
| Aug 31 | 10.3°C | 8.2°C | |
| Sep 1 | 10.3°C | 8.7°C | |
| Sep 2 | 10.3°C | 9.3°C | |
| Sep 3 | 10.3°C | 9.8°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 | 12°C | 17°C | 21°C |
| February | 12°C | 16°C | 20°C |
| March | 11°C | 15°C | 19°C |
| April | 10°C | 13°C | 16°C |
| May | 8°C | 11°C | 14°C |
| June | 6°C | 9°C | 12°C |
| July | 4°C | 7°C | 10°C |
| August | 5°C | 8°C | 10°C |
| September | 6°C | 9°C | 12°C |
| October | 7°C | 11°C | 14°C |
| November | 8°C | 12°C | 16°C |
| December | 10°C | 15°C | 19°C |
Cromwell: Weather Forecast
August 28
August 29
August 30
August 31
September 1
Location & Local Information
Cromwell is located where the Clutha River flows out of Lake Dunstan, giving the area a more settled, lake-influenced feel compared with faster river sections upstream and downstream. Water temperatures here reflect Central Otago’s dry climate and the moderating effect of the lake. In summer, the Clutha River around Cromwell typically reaches about 16–20 °C, sometimes feeling warmer in sheltered edges and slower-moving areas. During spring and autumn, temperatures usually range from around 11–15 °C. In winter, the water cools significantly, often sitting near 6–9 °C, which feels very cold and limits water contact.
Swimming Conditions
Swimming in the Clutha River near Cromwell is allowed and is most common during the summer months, when temperatures are at their highest and conditions are more predictable. Compared with other parts of the river, flows here are generally calmer due to the influence of Lake Dunstan, making certain areas suitable for casual swimming and cooling off. Even so, the river remains cold by nature, and currents can still be present, particularly away from the shoreline. After heavy rain, water levels and clarity can change quickly. For these reasons, swimming is best enjoyed in warm, settled weather and in known, calm locations. Outside summer, cold water temperatures make swimming brief or uncommon, with the river better suited to scenic enjoyment than regular swimming.