River Test Water Temperature Today
River Test, a river swimming spot in Hampshire, United Kingdom. The water stays cool at its summer peak — good for a short, bracing swim, and is cold but ice-free in winter.
In August River Test averages about 17°C, peaking near 17°C in July, August, September and dropping to roughly 8°C at its coldest.
River and swimming-hole temperatures are modelled from long-term monthly averages and refined with live air temperature, wind and UV. Moving water reacts faster to the weather than a lake or the sea.
River Test water temperature by month
| Month | Average water temperature | Swimming |
|---|---|---|
| January | 8.6°C | cold |
| February | 8.0°C | cold |
| March | 8.6°C | cold |
| April | 10.3°C | cool |
| May | 12.5°C | cool |
| June | 14.8°C | cool |
| July | 16.4°C | mild |
| August | 17.0°C | mild |
| September | 16.4°C | mild |
| October | 14.8°C | cool |
| November | 12.5°C | cool |
| December | 10.3°C | cool |
River Test swim conditions FAQ
What is the water temperature in River Test right now?
In August the water in River Test averages about 17°C. We refine that long-term average with today's air temperature, because this river responds quickly to the weather.
When is the best time to swim in River Test?
Water here stays below 18°C all year, peaking near 17°C in July, August, September. Most swimmers use a wetsuit and keep swims short.
Can you swim in River Test in winter?
Yes, but winter temperatures drop to roughly 8°C. Below 12°C, cold-water shock is the main risk: enter slowly, never swim alone, and limit time in the water.
Is River Test safe for swimming?
Moving and inland water carries different risks from the sea: check flow after rain, avoid weirs and undercut banks, look for submerged rocks before jumping, and respect local access rules and water-quality notices.
Water safety tips
- Check the flow rate after heavy rain — inland water can rise and speed up within hours.
- Never jump before checking depth and submerged rocks; levels change through the season.
- Enter slowly to control cold-water shock, and get out before you start shivering.
- Swim with someone else and agree an exit point downstream before you start.
Swim season here: cold-water swimming all year.
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