Jackson Bay – current water temperature and swimming conditions
This page shows the current water temperature at Jackson Bay in West Coast Region. You can view recent sea temperature trends on a 30-day chart, check typical monthly water temperature ranges, and compare today’s reading with historical averages for this date. The page also includes a 7-day water temperature forecast, nearby beaches with similar conditions, local weather information, and a summary of swimming conditions to help you assess how suitable the water is for swimming.
Current Sea Water Temperature
The average sea water temperature today in Jackson Bay is about 13°C.
Water Temperature in Jackson Bay: Daily Trends, Historical Records, and Forecast
❌ Water at this temperature feels cold and is generally suitable only for brief immersion. Swimming without a wetsuit can quickly become uncomfortable, and exposure time is usually short. These conditions are mainly suitable for experienced swimmers or those using proper thermal gear.
It’s important to note that these swimming tips and recommendations apply only in settled weather. When air temperatures drop below 20°C — and sometimes even below 25°C — swimming can feel uncomfortable, even when water temperatures are relatively high.
Water Temperature Over the Last 30 Days
Water temperatures in Jackson Bay have been gradually cooling over the past month, with a further drop recorded during the last week.
According to our forecast, Sea water temperature in Jackson Bay will be 11.7°C in the next 7 days. See the table below for daily data for the upcoming week.
Table of Daily Sea Temperature Data
| Date | Current | Average | Forecast |
|---|---|---|---|
| Jul 2 | 13.3°C | 11.3°C | |
| Jul 3 | 13.2°C | 11.5°C | |
| Jul 4 | 13.5°C | 11.0°C | |
| Jul 5 | 13.5°C | 11.0°C | |
| Jul 6 | 13.6°C | 11.0°C | |
| Jul 7 | 13.6°C | 11.0°C | |
| Jul 8 | 13.7°C | 11.0°C | |
| Jul 9 | 13.5°C | 10.8°C | |
| Jul 10 | 13.4°C | 10.8°C | 13.4°C |
| Jul 11 | 10.0°C | 13.2°C | |
| Jul 12 | 10.0°C | 12.9°C | |
| Jul 13 | 10.0°C | 12.7°C | |
| Jul 14 | 10.0°C | 12.4°C | |
| Jul 15 | 10.0°C | 12.2°C | |
| Jul 16 | 11.0°C | 12.0°C | |
| Jul 17 | 10.0°C | 11.7°C |
* Current - Actual water temperature value
** Average - Average water temperature on this day in recent years
*** Forecast - Our water temperature forecast
Actual near-shore water temperatures in Jackson Bay can vary by several degrees from the values shown, particularly after heavy rain, strong southerlies, or prolonged windy conditions. Certain wind patterns can trigger upwelling, where cooler, deeper water is pushed to the surface and replaces the warmer top layer, leading to noticeable short-term changes in water temperature.
Our water temperature forecast is produced using a proprietary mathematical model that combines real-time measurements with long-term historical patterns, local weather conditions, wind strength and direction, and air temperature specific to each coastal region. To improve accuracy, we cross-check data from nearby locations and use multiple sources, including offshore buoys, satellite-based sea surface maps, and observations provided by local authorities.
Annual Water Temperature Overview by Month
Monthly Water Temp Ranges
Annual Water Temperature Trend
Jackson Bay, at the southern tip of the West Coast Region, opens into the Tasman Sea and is surrounded by steep bush-clad hills and remote wilderness. Sea temperatures here reflect the cool southern waters typical of this part of the South Island. In winter, from June to August, the water generally ranges between 10–13°C, which feels properly cold and is usually only comfortable for hardy swimmers or those wearing full wetsuits. Through spring, temperatures gradually lift to around 12–15°C. Summer, from December to March, brings the mildest conditions, with sea temperatures commonly sitting between 15–18°C during settled spells. Early autumn can still see 14–17°C before cooling again as winter approaches.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Min | Avg | Max |
|---|---|---|---|
| January | 13°C | 16°C | 19°C |
| February | 13°C | 17°C | 20°C |
| March | 13°C | 16°C | 19°C |
| April | 12°C | 15°C | 17°C |
| May | 10°C | 13°C | 16°C |
| June | 8°C | 11°C | 14°C |
| July | 7°C | 10°C | 12°C |
| August | 8°C | 10°C | 11°C |
| September | 8°C | 10°C | 12°C |
| October | 9°C | 12°C | 15°C |
| November | 10°C | 13°C | 16°C |
| December | 12°C | 15°C | 18°C |
* Click on a month to view detailed water temperature data.
Jackson Bay: Weather Forecast
July 11
July 12
July 13
Local Water Conditions and Nearby Spots
Swimming Conditions
Swimming is allowed in Jackson Bay, particularly in the more sheltered parts of the bay where the headlands offer some protection from the full force of the Tasman Sea. Even so, conditions can change quickly depending on wind and offshore weather systems. Swells and currents may still be present, and there are no regular lifeguard patrols, so swimmers need to assess the sea carefully before entering. On calm summer days the water can be clear and refreshing, making short swims enjoyable for confident swimmers. Outside the warmer months, cooler temperatures mean thermal gear is strongly recommended. Jackson Bay offers a remote and scenic ocean setting, but the water environment demands respect year-round.