Castletroy — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Castletroy, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Castletroy today is 19.4°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 | 20.9°C | 18.0°C | |
| JUL 17 | 20.9°C | 18.0°C | |
| JUL 18 | 20.9°C | 18.0°C | |
| JUL 19 | 20.5°C | 18.0°C | |
| JUL 20 | 20.4°C | 18.0°C | |
| JUL 21 | 20.2°C | 18.0°C | |
| JUL 22 | 19.8°C | 18.0°C | |
| JUL 23 | 19.7°C | 18.0°C | |
| JUL 24 | 18.0°C | 19.3°C | |
| JUL 25 | 18.0°C | 19.3°C | |
| JUL 26 | 18.0°C | 19.2°C | |
| JUL 27 | 18.0°C | 19.1°C | |
| JUL 28 | 18.0°C | 19.1°C | |
| JUL 29 | 18.0°C | 19.0°C | |
| JUL 30 | 18.0°C | 18.9°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 | 0°C | 3°C | 7°C |
| February | 0°C | 4°C | 9°C |
| March | 2°C | 6°C | 9°C |
| April | 6°C | 9°C | 12°C |
| May | 10°C | 15°C | 19°C |
| June | 13°C | 18°C | 22°C |
| July | 14°C | 18°C | 23°C |
| August | 14°C | 18°C | 23°C |
| September | 10°C | 15°C | 19°C |
| October | 8°C | 11°C | 14°C |
| November | 3°C | 7°C | 11°C |
| December | 3°C | 6°C | 9°C |
Castletroy: Weather Forecast
July 24
July 25
July 26
July 27
Location & Local Information
Castletroy is a suburb of Limerick city, situated near a stretch of the River Shannon that is generally considered non-tidal and upstream from the main urban center. Consequently, its water temperatures follow typical inland seasonal patterns. In winter, the river is cold, with temperatures dropping to around 6∘C to 9∘C (43∘F to 48∘F). During the height of summer, the river warms up, usually reaching between 16∘C and 20∘C (61∘F to 68∘F), making it more tolerable for swimmers.
While swimming is not officially managed at all points along the river near Castletroy, this stretch is considered generally safer for open-water activities than the tidal areas further downstream in the city. The presence of the University of Limerick (UL) on the riverbank means that kayaking and rowing are common, and informal swimming sometimes occurs near the university’s facilities, such as the UL Activity Centre which provides water-based instruction. Nearby attractions include the university's large, modern campus itself, which features extensive sports facilities and walking trails, and the picturesque village of Castleconnell just a short distance upstream.