Leiria — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Leiria, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Leiria today is 18.6°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 |
|---|---|---|---|
| SEP 13 | 18.7°C | 22.0°C | |
| SEP 14 | 18.5°C | 22.0°C | |
| SEP 15 | 19.5°C | 22.0°C | |
| SEP 16 | 19.4°C | 22.0°C | |
| SEP 17 | 19.7°C | 22.0°C | |
| SEP 18 | 19.5°C | 22.0°C | |
| SEP 19 | 17.8°C | 22.0°C | |
| SEP 20 | 18.1°C | 22.0°C | |
| SEP 21 | 22.0°C | 18.8°C | |
| SEP 22 | 22.0°C | 18.9°C | |
| SEP 23 | 22.0°C | 19.1°C | |
| SEP 24 | 22.0°C | 19.3°C | |
| SEP 25 | 22.0°C | 19.5°C | |
| SEP 26 | 22.0°C | 19.6°C | |
| SEP 27 | 22.0°C | 19.8°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 | 6°C | 9°C | 12°C |
| February | 6°C | 9°C | 13°C |
| March | 9°C | 12°C | 15°C |
| April | 9°C | 13°C | 17°C |
| May | 10°C | 15°C | 21°C |
| June | 16°C | 20°C | 25°C |
| July | 18°C | 23°C | 27°C |
| August | 18°C | 23°C | 27°C |
| September | 18°C | 22°C | 27°C |
| October | 14°C | 18°C | 20°C |
| November | 11°C | 15°C | 18°C |
| December | 8°C | 11°C | 14°C |
Leiria: Weather Forecast
September 21
September 22
September 23
September 24
September 25
September 26
Location & Local Information
Leiria, in the central coastal region of Portugal, sits near several inland lakes and reservoirs where water temperature varies with season, depth and local weather. Surface temperatures in these bodies of water typically run from about 8–12 °C (46–54 °F) in winter, rise to roughly 12–18 °C (54–64 °F) in spring, reach common summertime ranges of 18–25 °C (64–77 °F) in shallow, sheltered areas, and fall to around 14–20 °C (57–68 °F) in autumn. Deeper or shaded parts of reservoirs remain colder year-round, while exposed shallows warm fastest on sunny days, so actual readings at any given spot can differ from the regional averages.
Swimming is commonly possible in recreational lakes and designated bathing areas around Leiria during warmer months, and local authorities often mark safe zones and sometimes provide lifeguards. However, some reservoirs serve as drinking-water sources or have boating and steep-drop hazards, and swimming there is restricted or banned for safety and water-quality reasons. Before entering any lake near Leiria it is advisable to check signage, local rules and recent water-quality reports; seasonal algal blooms, currents, submerged obstacles and sudden depth changes are the main reasons access may be limited even when temperatures are inviting.