Grimstad — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Grimstad, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Grimstad today is 4.1°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 | 4.0°C | 7.0°C | |
| APR 12 | 4.1°C | 7.0°C | |
| APR 13 | 3.9°C | 7.0°C | |
| APR 14 | 3.9°C | 7.0°C | |
| APR 15 | 4.1°C | 7.0°C | |
| APR 16 | 4.3°C | 7.0°C | |
| APR 17 | 4.1°C | 7.0°C | |
| APR 18 | 4.1°C | 7.0°C | |
| APR 19 | 7.0°C | 4.2°C | |
| APR 20 | 7.0°C | 4.4°C | |
| APR 21 | 7.0°C | 4.5°C | |
| APR 22 | 7.0°C | 4.7°C | |
| APR 23 | 7.0°C | 4.8°C | |
| APR 24 | 7.0°C | 5.0°C | |
| APR 25 | 7.0°C | 5.1°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 |
Grimstad: Weather Forecast
April 19
April 20
April 21
April 22
April 23
April 24
Location & Local Information
Grimstad, in Agder County, has a range of inland lake temperatures that follow the Norwegian seasonal cycle. Typical lake water temperatures in spring sit around 4–12 °C (39–54 °F) as ice melts and the sun warms shallow bays. In summer, July and early August are the warmest months, with many lakes commonly reaching 15–22 °C (59–72 °F) on sunny days; sheltered, shallow spots can be a bit warmer in heatwaves. By autumn the water cools to roughly 8–14 °C (46–57 °F) as air temperatures drop, and in winter lakes hover near freezing, often 0–4 °C (32–39 °F) where ice may form.
Swimming in Grimstad’s lakes is generally allowed and widely practiced, supported by Norway’s public access traditions and many informal bathing spots. Summer months offer the most comfortable conditions for casual swimming, while spring and autumn waters are brisk and require more caution. Water quality is usually good, but local advisories or signage can restrict access near intakes or private properties, and designated beaches are safer because they may have clearer access and emergency information. Winter ice swimming is practiced by some, but it requires experience, safe ice conditions and appropriate precautions.