Coimbra — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Coimbra, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Coimbra today is 18.4°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 |
|---|---|---|---|
| OCT 9 | 18.9°C | 17.0°C | |
| OCT 10 | 18.7°C | 17.0°C | |
| OCT 11 | 18.6°C | 17.0°C | |
| OCT 12 | 18.8°C | 17.0°C | |
| OCT 13 | 18.3°C | 17.0°C | |
| OCT 14 | 18.2°C | 17.0°C | |
| OCT 15 | 18.0°C | 17.0°C | |
| OCT 16 | 18.4°C | 17.0°C | |
| OCT 17 | 17.0°C | 18.3°C | |
| OCT 18 | 17.0°C | 18.3°C | |
| OCT 19 | 17.0°C | 18.2°C | |
| OCT 20 | 17.0°C | 18.1°C | |
| OCT 21 | 17.0°C | 18.1°C | |
| OCT 22 | 17.0°C | 18.0°C | |
| OCT 23 | 17.0°C | 17.9°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 | 5°C | 9°C | 11°C |
| February | 7°C | 10°C | 13°C |
| March | 8°C | 11°C | 14°C |
| April | 9°C | 13°C | 18°C |
| May | 13°C | 18°C | 22°C |
| June | 17°C | 23°C | 28°C |
| July | 19°C | 24°C | 28°C |
| August | 20°C | 24°C | 28°C |
| September | 18°C | 23°C | 27°C |
| October | 13°C | 17°C | 19°C |
| November | 9°C | 13°C | 16°C |
| December | 8°C | 11°C | 14°C |
Coimbra: Weather Forecast
October 18
October 19
October 20
October 21
October 22
Location & Local Information
Coimbra, in the district of the same name in central Portugal, sits on the Mondego River and near several reservoirs and inland lakes where people swim in warmer months. Typical water temperatures in these inland bodies vary by season and by depth: winter surface temperatures commonly range from about 6–12 °C (43–54 °F), spring from roughly 10–18 °C (50–64 °F), summer often reaches 20–26 °C (68–79 °F) in shallower, sun-exposed areas, and autumn usually cools to about 12–18 °C (54–64 °F). Mountain-fed lagoons and deeper reservoirs stay colder year-round, while sheltered coves and slow-moving upper reaches warm fastest on hot summer days.
Swimming is possible in many lakes and reservoir zones around Coimbra, but it depends on local rules and conditions: designated bathing areas and monitored beaches are generally allowed because they meet water-quality and safety standards, while some dam shores and infrastructure zones remain off-limits for safety, navigation or water-supply protection. Visitors should follow posted signage and local guidance about lifeguards, bacteria or algal warnings, and sudden depth changes; even when permitted, colder temperatures and hidden currents mean caution is advised, especially outside peak summer months.