Onyar River — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in the Onyar River, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in the Onyar River today is 20.5°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 68°F (20°C) to 74°F (23°C). The water is warm and pleasant for swimming, and in this range, one can stay in the water for extended periods without the risk of hypothermia. This is the ideal temperature for relaxation, swimming, and water sports. Families with children, as well as outdoor enthusiasts, will enjoy swimming and time spent in the water. For most people, this is the optimal temperature for a comfortable beach experience. 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 | 21.2°C | 19.0°C | |
| SEP 14 | 20.4°C | 19.0°C | |
| SEP 15 | 20.7°C | 19.0°C | |
| SEP 16 | 20.5°C | 19.0°C | |
| SEP 17 | 21.1°C | 19.0°C | |
| SEP 18 | 20.5°C | 19.0°C | |
| SEP 19 | 21.0°C | 19.0°C | |
| SEP 20 | 20.5°C | 19.0°C | |
| SEP 21 | 19.0°C | 20.4°C | |
| SEP 22 | 19.0°C | 20.4°C | |
| SEP 23 | 19.0°C | 20.3°C | |
| SEP 24 | 19.0°C | 20.2°C | |
| SEP 25 | 19.0°C | 20.1°C | |
| SEP 26 | 19.0°C | 20.1°C | |
| SEP 27 | 19.0°C | 20.0°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 | 11°C |
Onyar River: Water Temperature by Location
Onyar River: Weather Forecast
September 21
September 22
September 23
September 24
September 25
September 26
Location & Local Information
The Onyar (Spanish: Río Onyar) flows through Girona and the surrounding Girona province in Catalonia. Water temperatures vary with season and local conditions: in winter the river commonly cools to roughly 6–12 °C (43–54 °F), while spring sees a gradual rise to around 10–16 °C (50–61 °F). Summer is when the warmest, shallower sections can reach approximately 18–24 °C (64–75 °F), though shaded or faster-flowing stretches may remain cooler. Autumn temperatures generally fall back to about 12–18 °C (54–64 °F). These ranges are approximate and depend on recent weather, flow from upstream reservoirs, and urban runoff; short-term spikes or drops can occur after heatwaves or heavy rains.
Swimming opportunities on the Onyar are limited and context-dependent. In the urban portions that cross Girona the river is narrow, sometimes shallow and has variable water quality and underwater hazards, so public authorities and local custom typically discourage bathing there. Upstream rural pools and slower meanders may be used for informal swimming in warm months where water is accessible and clean, but this depends on local rules, private land, and current monitoring of contamination and flow safety. Anyone considering swimming should check local advisories, respect posted prohibitions, and be aware of currents, submerged obstacles, and water quality.