Arendal — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Arendal, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Arendal today is 3.8°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
❌ As of today, the minimum water temperature ranges less than 41°F (5°C). Such water is extremely cold and not recommended for swimming without proper preparation. In these conditions, the risk of hypothermia is very high, and prolonged exposure to the water can be hazardous to your health. If you decide to swim, it is important to have the appropriate gear, such as a wetsuit. Typically, only experienced swimmers or those who practice winter swimming venture into such waters. 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 |
|---|---|---|---|
| APR 11 | 3.7°C | 7.0°C | |
| APR 12 | 3.8°C | 7.0°C | |
| APR 13 | 3.6°C | 7.0°C | |
| APR 14 | 3.6°C | 7.0°C | |
| APR 15 | 3.6°C | 7.0°C | |
| APR 16 | 3.8°C | 7.0°C | |
| APR 17 | 3.8°C | 7.0°C | |
| APR 18 | 3.8°C | 7.0°C | |
| APR 19 | 7.0°C | 4.0°C | |
| APR 20 | 7.0°C | 4.1°C | |
| APR 21 | 7.0°C | 4.3°C | |
| APR 22 | 7.0°C | 4.4°C | |
| APR 23 | 7.0°C | 4.6°C | |
| APR 24 | 7.0°C | 4.8°C | |
| APR 25 | 7.0°C | 4.9°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 | 0°C | 2°C | 5°C |
| February | 0°C | 2°C | 5°C |
| March | 0°C | 3°C | 6°C |
| April | 3°C | 7°C | 9°C |
| May | 7°C | 11°C | 16°C |
| June | 11°C | 16°C | 20°C |
| July | 13°C | 18°C | 22°C |
| August | 12°C | 17°C | 21°C |
| September | 9°C | 14°C | 18°C |
| October | 5°C | 9°C | 11°C |
| November | 2°C | 6°C | 9°C |
| December | 0°C | 3°C | 6°C |
Arendal: Weather Forecast
April 19
April 20
April 21
April 22
April 23
April 24
Location & Local Information
Arendal (in Norwegian - Arendal) in Agder County is a coastal municipality with numerous inland lakes and sheltered bathing spots. Water temperatures in local lakes vary seasonally: in spring (April–May) lake surfaces commonly range from about 2–10 °C (36–50 °F) as they warm after ice melt; summer (June–August) temperatures typically sit between 16–22 °C (61–72 °F), with shallow, sun-exposed ponds sometimes reaching 23–25 °C (73–77 °F) during hot spells; autumn (September–November) sees a decline to roughly 8–14 °C (46–57 °F); and winter (December–March) often brings surface temperatures near 0–4 °C (32–39 °F), with some smaller lakes freezing over. These ranges depend on lake depth, shelter from wind, and recent weather.
Swimming in Arendal’s lakes is generally allowed and common, supported by Norway’s tradition of public access and often good bathing water quality. Recreational swimming is most popular in summer when temperatures are comfortable; winter swimming or ice bathing is practiced by some but requires careful safety measures. Visitors should heed local signs, be aware that lifeguards are not always present, and consider variations in depth, underwater terrain and occasional algal blooms when planning to swim.