Arcos de Valdevez — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Arcos de Valdevez, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Arcos de Valdevez 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 |
|---|---|---|---|
| AUG 24 | 20.7°C | 22.0°C | |
| AUG 25 | 20.7°C | 22.0°C | |
| AUG 26 | 20.7°C | 22.0°C | |
| AUG 27 | 19.8°C | 22.0°C | |
| AUG 28 | 19.7°C | 22.0°C | |
| AUG 29 | 19.7°C | 22.0°C | |
| AUG 30 | 19.4°C | 22.0°C | |
| AUG 31 | 19.4°C | 22.0°C | |
| SEP 1 | 19.0°C | 19.4°C | |
| SEP 2 | 19.0°C | 19.4°C | |
| SEP 3 | 19.0°C | 19.3°C | |
| SEP 4 | 19.0°C | 19.3°C | |
| SEP 5 | 19.0°C | 19.3°C | |
| SEP 6 | 19.0°C | 19.3°C | |
| SEP 7 | 19.0°C | 19.3°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 | 5°C | 8°C | 12°C |
| March | 8°C | 11°C | 14°C |
| April | 10°C | 14°C | 17°C |
| May | 13°C | 18°C | 22°C |
| June | 15°C | 19°C | 24°C |
| July | 17°C | 21°C | 26°C |
| August | 18°C | 22°C | 27°C |
| September | 15°C | 19°C | 24°C |
| October | 12°C | 16°C | 18°C |
| November | 9°C | 13°C | 16°C |
| December | 5°C | 9°C | 13°C |
Arcos de Valdevez: Weather Forecast
September 1
September 2
September 3
September 4
September 5
Location & Local Information
Arcos de Valdevez, in the Viana do Castelo District, sits amid river valleys and small reservoirs that reflect the Atlantic-influenced climate of northern Portugal. Water temperatures in the local lakes and river beaches vary markedly by season and depth: in winter surface temperatures commonly range from about 6–12 °C (43–54 °F), in spring 10–16 °C (50–61 °F), in summer 18–26 °C (64–79 °F) with the warmest, shallowest spots occasionally reaching the upper 20s °C (80s °F) on hot spells, and in autumn 12–20 °C (54–68 °F). These figures are general guidelines—actual temperatures depend on recent weather, water depth, and flow from upstream sources, and deeper or fast-flowing stretches remain noticeably cooler year-round.
Swimming is generally permitted in designated river beaches and lake areas around Arcos de Valdevez, especially during the warmer months when local authorities monitor water quality and safety. Access may be restricted or discouraged during high flows, heavy rains, water treatment operations, or when authorities detect contamination or blue‑green algae, and lifeguard coverage is not guaranteed outside official bathing areas and peak season. Visitors should follow posted signs and local guidance: allowed swimming typically reflects acceptable water quality and manageable currents, while prohibitions are issued for public-safety or environmental reasons.