Aker River — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in the Aker River, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in the Aker River today is 12.6°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 54°F (12°C) to 60°F (15°C). The water is significantly warmer, and swimming becomes possible for most people. However, caution may still be required for prolonged stays in the water, as extended exposure can cause discomfort. This is a suitable temperature range for short swims and for those accustomed to cooler water. For more comfortable swimming, it is recommended to use proper gear. 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 | 13.4°C | 15.0°C | |
| SEP 14 | 12.8°C | 15.0°C | |
| SEP 15 | 13.0°C | 15.0°C | |
| SEP 16 | 12.9°C | 15.0°C | |
| SEP 17 | 12.9°C | 15.0°C | |
| SEP 18 | 12.7°C | 15.0°C | |
| SEP 19 | 12.8°C | 15.0°C | |
| SEP 20 | 12.6°C | 15.0°C | |
| SEP 21 | 15.0°C | 12.7°C | |
| SEP 22 | 15.0°C | 12.8°C | |
| SEP 23 | 15.0°C | 13.0°C | |
| SEP 24 | 15.0°C | 13.1°C | |
| SEP 25 | 15.0°C | 13.2°C | |
| SEP 26 | 15.0°C | 13.3°C | |
| SEP 27 | 15.0°C | 13.4°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 | 0°C | 2°C | 5°C |
| February | 0°C | 2°C | 5°C |
| March | 0°C | 3°C | 6°C |
| April | 1°C | 6°C | 9°C |
| May | 6°C | 10°C | 15°C |
| June | 9°C | 15°C | 20°C |
| July | 14°C | 18°C | 23°C |
| August | 14°C | 18°C | 23°C |
| September | 10°C | 15°C | 19°C |
| October | 6°C | 9°C | 12°C |
| November | 2°C | 6°C | 9°C |
| December | 0°C | 3°C | 6°C |
Aker River: Water Temperature by Location
Aker River: Weather Forecast
September 21
September 22
September 23
September 24
September 25
September 26
Location & Local Information
Source:
• location Maridalsvannet
• elevation 149 m (489 ft)
Mouth:
• location Paulsenkaien, Oslofjorden
• elevation 0 m (0 ft)
Length 9.8 km (6.1 mi)
The Aker River (in Norwegian Akerselva) is an urban watercourse running through Oslo and typically carries cool water year‑round. Typical winter surface temperatures range from about 0–4 °C (32–39 °F) and may approach freezing in sheltered pools; spring sees a rise into roughly 3–10 °C (37–50 °F) as snowmelt and warming air increase flows. In summer, temperatures are most variable but commonly lie in the 10–20 °C range (50–68 °F) in open stretches, with occasional warm spells pushing shallow, still sections toward 20–22 °C (68–72 °F). Autumn cooling usually brings water back to roughly 6–12 °C (43–54 °F). Temperatures depend on location along the river, flow rate and recent weather; heavy rain, freshets or heat waves can change values rapidly.
Swimming in Akerselva is possible in some local spots and is practiced by residents, but it is not universally promoted as a formal bathing area. There is no blanket legal prohibition across the entire river, yet safety and water quality considerations matter: strong currents, weirs, submerged debris and variable pollution after run‑off or heavy rain can make parts unsafe, and there are generally no lifeguards. For these reasons many people prefer designated public swimming facilities, lakes or fjord beaches in Oslo, while those who swim in the river do so at their own risk and with local caution.