Lisbon — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lisbon, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lisbon today is 23.6°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 75°F (23°C) to 79°F (26°C). This is a very comfortable temperature for swimming, and many people can enjoy prolonged stays in the water without feeling cold. The water is pleasantly warm, making it ideal for relaxation and water sports. This temperature range is particularly popular among tourists, as it combines comfort and safety for health. 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 |
|---|---|---|---|
| AUG 4 | 22.5°C | 24.0°C | |
| AUG 5 | 22.6°C | 24.0°C | |
| AUG 6 | 22.5°C | 24.0°C | |
| AUG 7 | 22.6°C | 24.0°C | |
| AUG 8 | 22.6°C | 24.0°C | |
| AUG 9 | 22.6°C | 24.0°C | |
| AUG 10 | 23.4°C | 24.0°C | |
| AUG 11 | 23.6°C | 24.0°C | |
| AUG 12 | 24.0°C | 23.6°C | |
| AUG 13 | 24.0°C | 23.6°C | |
| AUG 14 | 24.0°C | 23.7°C | |
| AUG 15 | 24.0°C | 23.7°C | |
| AUG 16 | 24.0°C | 23.7°C | |
| AUG 17 | 24.0°C | 23.7°C | |
| AUG 18 | 24.0°C | 23.7°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 | 6°C | 9°C | 12°C |
| February | 6°C | 9°C | 13°C |
| March | 6°C | 10°C | 15°C |
| April | 9°C | 13°C | 17°C |
| May | 13°C | 18°C | 22°C |
| June | 17°C | 21°C | 26°C |
| July | 18°C | 23°C | 27°C |
| August | 19°C | 24°C | 28°C |
| September | 18°C | 22°C | 27°C |
| October | 12°C | 16°C | 18°C |
| November | 9°C | 13°C | 16°C |
| December | 8°C | 11°C | 15°C |
Lisbon: Weather Forecast
August 12
August 13
August 14
August 15
Location & Local Information
Lisbon (Portuguese: Lisboa), at the heart of the Lisbon metropolitan area, sits beside the Tagus estuary rather than a large natural lake, but there are several nearby reservoirs and freshwater “lakes” used for recreation. Water temperature in those inland bodies typically follows a seasonal pattern: in summer surface temperatures commonly reach about 20–26 °C (68–79 °F), spring and autumn often range from roughly 14–19 °C (57–66 °F), and winter surface temperatures can fall to around 8–13 °C (46–55 °F). The tidal Tagus estuary and coastal waters are a bit cooler on average, with summer sea temperatures near Lisbon around 18–22 °C (64–72 °F) and winter values near 14–16 °C (57–61 °F). Actual temperatures vary with wind, depth and recent weather.
Swimming in the Lisbon area is permitted in many designated freshwater and coastal spots, but it depends on local rules and water quality. Reservoirs that supply drinking water may have restricted zones, and some areas are closed for safety because of boat traffic, steep banks or poor water quality after heavy rain. Coastal beaches and monitored river beaches tend to be the safer options during summer when lifeguards are present and water quality is regularly checked. Always follow local signage and advisories before entering the water.