River Shannon — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in the River Shannon, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in the River Shannon today is 19°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 65°F (18°C) to 68°F (20°C). This is already quite warm water, which is ideal for most people. Swimming becomes comfortable, and prolonged stays in the water do not cause discomfort. This temperature is perfect for family trips and for those who prefer warmer water. It is also comfortable for water sports such as surfing or swimming. 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 |
|---|---|---|---|
| JUL 16 | 20.2°C | 19.0°C | |
| JUL 17 | 20.3°C | 19.0°C | |
| JUL 18 | 20.4°C | 19.0°C | |
| JUL 19 | 20.3°C | 19.0°C | |
| JUL 20 | 20.2°C | 19.0°C | |
| JUL 21 | 19.8°C | 19.0°C | |
| JUL 22 | 19.3°C | 19.0°C | |
| JUL 23 | 19.0°C | 19.0°C | |
| JUL 24 | 19.0°C | 19.0°C | |
| JUL 25 | 19.0°C | 19.0°C | |
| JUL 26 | 19.0°C | 19.0°C | |
| JUL 27 | 19.0°C | 19.0°C | |
| JUL 28 | 19.0°C | 19.0°C | |
| JUL 29 | 19.0°C | 19.0°C | |
| JUL 30 | 19.0°C | 19.0°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 | 1°C | 5°C | 8°C |
| February | 1°C | 5°C | 8°C |
| March | 2°C | 6°C | 9°C |
| April | 6°C | 9°C | 12°C |
| May | 9°C | 14°C | 18°C |
| June | 13°C | 19°C | 23°C |
| July | 15°C | 19°C | 24°C |
| August | 14°C | 18°C | 23°C |
| September | 11°C | 16°C | 20°C |
| October | 9°C | 12°C | 15°C |
| November | 4°C | 7°C | 11°C |
| December | 1°C | 5°C | 8°C |
River Shannon: Water Temperature by Location
River Shannon: Weather Forecast
July 24
July 25
July 26
July 27
Location & Local Information
Source Shannon Pot
• location Glangevlin, Cuilcagh Mountain, County Cavan
• coordinates 54.235°N 7.92°W
• elevation 100
Mouth Shannon Estuary
• location Limerick
• coordinates 52.657°N 8.66°W
Length 360 kilometres (220 mi)
The River Shannon, Ireland’s longest river, flows for over 350 km from County Cavan to the Shannon Estuary in Limerick. Its temperature varies with the seasons and the section of the river, influenced by local climate and water depth. In winter, average surface temperatures are around 4–6°C (39–43°F), while in summer they typically rise to 15–18°C (59–64°F). Shallow stretches and backwaters can occasionally reach 19°C (66°F) during prolonged warm periods, but the main channel remains cooler due to continuous flow and depth. The Shannon’s wide, slow-moving waters create a mix of fresh and mild conditions ideal for boating, fishing, and other recreation during Ireland’s milder months.
Swimming is permitted along much of the River Shannon, though it is recommended only in safe, known areas due to varying currents and boat traffic. During summer, spots near Lanesborough, Athlone, and Killaloe attract swimmers and triathletes, with wetsuits common outside peak heat periods. Water quality is generally good, but swimmers should always be mindful of changing weather and river levels. Beyond swimming, the Shannon is renowned for cruising, kayaking, and wildlife watching, with towns like Athlone, Clonmacnoise, and Carrick-on-Shannon offering historic sites, walking trails, and riverside scenery that showcase the tranquil heart of Ireland.