Semnon River — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in the Semnon River, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in the Semnon River today is 16.6°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 60°F (15°C) to 65°F (18°C). The water is comfortable for most people, making it an ideal range for water sports enthusiasts. The temperature does not cause significant discomfort, and swimming will be pleasant for the majority. However, it's important to remember that prolonged exposure to the water can still lead to cooling, so it's essential to monitor the time spent in the water, especially for children or elderly people. It is important to note that these swimming tips and recommendations apply only in good weather. When the air temperature is below 68°F (20°C), and sometimes even below 77°F (25°C), swimming can be unpleasant even with relatively high water temperatures.
Water Temperature Chart Over the Last 30 Days
Table of Daily Sea Temperature Data
| Date | Current | Average | Forecast |
|---|---|---|---|
| SEP 13 | 17.9°C | 17.0°C | |
| SEP 14 | 17.9°C | 17.0°C | |
| SEP 15 | 18.1°C | 17.0°C | |
| SEP 16 | 18.0°C | 17.0°C | |
| SEP 17 | 17.1°C | 17.0°C | |
| SEP 18 | 17.0°C | 17.0°C | |
| SEP 19 | 16.8°C | 17.0°C | |
| SEP 20 | 16.5°C | 17.0°C | |
| SEP 21 | 17.0°C | 16.6°C | |
| SEP 22 | 17.0°C | 16.6°C | |
| SEP 23 | 17.0°C | 16.7°C | |
| SEP 24 | 17.0°C | 16.7°C | |
| SEP 25 | 17.0°C | 16.7°C | |
| SEP 26 | 17.0°C | 16.7°C | |
| SEP 27 | 17.0°C | 16.7°C |
* Current - Actual water temperature value
** Average - Average water temperature on this day in recent years
*** Forecast - Our water temperature forecast
Actual nearshore water temperatures may fluctuate by several degrees from the reported values, especially following heavy rainfall or extended periods of strong winds. Certain wind patterns can cause colder, deeper waters to rise and replace the sun-warmed surface water, leading to noticeable variations.
Our forecast is based on a proprietary mathematical model that considers real-time water temperature changes, historical trends, key weather patterns, wind strength and direction, and air temperature specific to each region. Additionally, we incorporate data from other resorts to enhance accuracy.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Min | Avg | Max |
|---|---|---|---|
| January | 2°C | 6°C | 9°C |
| February | 2°C | 6°C | 9°C |
| March | 5°C | 9°C | 11°C |
| April | 9°C | 12°C | 15°C |
| May | 10°C | 15°C | 19°C |
| June | 15°C | 19°C | 24°C |
| July | 16°C | 20°C | 25°C |
| August | 16°C | 20°C | 25°C |
| September | 12°C | 17°C | 21°C |
| October | 9°C | 13°C | 16°C |
| November | 5°C | 9°C | 12°C |
| December | 2°C | 6°C | 9°C |
Semnon River: Water Temperature by Location
Semnon River: Weather Forecast
September 21
September 22
September 23
September 24
September 25
September 26
Location & Local Information
Source:
• location Congrier
• coordinates 47°47′30″N 01°08′34″W
• elevation 90 m (300 ft)
Mouth:
• location Vilaine
• coordinates 47°53′59″N 01°45′25″W
• elevation 7 m (23 ft)
Length 73.3 km (45.5 mi)
Basin size 400 km2 (150 sq mi)
Discharge:
• average 2.8 m3/s (99 cu ft/s)
The Semnon River, winding through the Brittany region in France, is a calm waterway that supports local recreation and wildlife. In the summer, water temperatures in the Semnon generally range from 16°C to 20°C (61°F to 68°F), making it relatively cool but refreshing for outdoor activities. Swimming is possible in certain sections of the river, particularly where currents are gentle and access to the water is easier, though there aren’t any officially designated swimming spots along the river. This means that while locals occasionally take a quick dip, it’s recommended to exercise caution and check for any local advisories.
The Semnon River is ideal for light water activities like kayaking, fishing, and riverside picnicking, rather than extended swimming due to variable water quality and natural vegetation along its banks. Those looking to enjoy the water safely should prioritize checking local notices or speaking with nearby residents about water conditions, as the river’s environment can change with the seasons and rainfall levels.