All data are in degrees Fahrenheit

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Water temperature in Hafnarfjörður

Detailed information about the current water temperature in Hafnarfjörður. The trend over the last two weeks, daily averages, and precise forecast of the water temperature changes. Gain a deeper understanding of seasonal dynamics with monthly statistical analyses covering recent years.
Sea temperature in Hafnarfjörður now

51.9

°F

July 16, 14:08

Trend:

stable

Yesterday:

51.6°F

Tomorrow:

51.9°F

Sunrise:

03:44

Sunset:

23:22

Day Length:

19 h. 38 min.

Hafnarfjörður in July

Minimum:

34.1°F

Average:

37.6°F

Maximum:

40.2°F

Sea water temperature in Hafnarfjörður today

As of now, in Hafnarfjörður, the water temperature is 51.9°F. Swimming in water of this temperature is considered as extremely cold, and there's a substantial risk of hypothermia if exposed for more than a brief duration. Today's reading is 0.4°F lower than the average recorded on this particular day in recent years. Since yesterday, there was a slight increase in temperature. This indicates a warming trend over the past day. According to the forecast, we expect the temperature to stay about the same.

Recent sea temperature and forecast

Today's water temperature is slightly lower than the average registered over the last two weeks, indicating a slight cooling trend. It also falls within the range of the average temperature recorded for this date, suggesting a consistent weather trend. The maximum temperature recorded for this date was 53.6°F on 2025, while the historical minimum was 50.6°F on 2018.

The water temperature over the last two weeks displayed soome variability. While the two week average stayed close to the historical average, there were some days when the temperature was close to the maximum recorded over the past years. Over the next week, the forecast shows a steady trend, with temperatures staying close to the average of 52.1°F. Both minimum and maximum temperatures expected to be close to the average, offering a week of stable water conditions.

Daily water temperature in Hafnarfjörður

Date Current Year

actual* / forecast**

last year 10 years average
Jul 2 52.4°F 52.1°F 51.2°F
Jul 3 52.1°F 52.2°F 51.3°F
Jul 4 52.5°F 52.2°F 51.7°F
Jul 5 53.2°F 52.5°F 51.9°F
Jul 6 53.3°F 52.8°F 52.0°F
Jul 7 52.8°F 53.4°F 51.9°F
Jul 8 52.2°F 53.3°F 52.1°F
Jul 9 52.6°F 53.2°F 52.3°F
Jul 10 52.7°F 53.0°F 52.3°F
Jul 11 52.6°F 52.9°F 52.3°F
Jul 12 52.1°F 52.8°F 52.3°F
Jul 13 52.8°F 52.7°F 52.3°F
Jul 14 51.9°F 52.6°F 52.3°F
Jul 15 51.6°F 53.5°F 52.2°F
Jul 16 51.9°F 53.6°F 52.3°F
Jul 17 51.9°F 53.3°F 52.2°F
Jul 18 51.8°F 53.1°F 52.2°F
Jul 19 52.0°F 52.9°F 52.4°F
Jul 20 52.0°F 52.7°F 52.4°F
Jul 21 52.1°F 52.7°F 52.4°F
Jul 22 52.4°F 52.8°F 52.7°F
Jul 23 52.3°F 52.8°F 52.7°F

* actual - actual temperature values

** forecast - projected values for the next week

Real-time coastal temperatures could deviate by several degrees from the provided readings. These deviations often become evident following intense rainfall or strong winds.

Our forecasting methodology leverages a mathematical model, that uses current water and weather conditions, historical records, wind intensity and direction.

Sea water temperature in Hafnarfjörður by month

In an average year, Hafnarfjörður offers no days when the water temperature is warm enough to swim comfortably.
The warmest water in Hafnarfjörður was recorded on September 5, 2025, reaching a 56.4°F. While the coldest temperature occurred on January 24, 2023, dipping to 33.8°F. The average readings by season are 37.8°F in Winter, 40.8°F in Spring, 51.7°F in Summer, and 47.1°F in Autumn.

Popular neighboring cities and resorts

City Water temperature* Distance**
Kópavogur 52.1°F 3mi
Álftanes 51.8°F 3mi
Reykjavík 52.2°F 5mi
Akranes 51.6°F 18mi
Keflavík 51.0°F 19mi

* current water temperature in this city

** straight line distance from Hafnarfjörður