What is the current water temperature in Ruhnu?

Q: What is the current water temperature in Ruhnu?

As of now, in Ruhnu, the water temperature is 7.48°C. 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.

Estonia > Ruhnu

Water temperature in Ruhnu

Detailed information about the current water temperature in Ruhnu. 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.

45.5

°F

May 22, 19:03

Trend:

increasing

Yesterday:

44.9°F

Tomorrow:

46.5°F

Sunrise:

04:51

Sunset:

21:57

Day Length:

17 h. 6 min.

Ruhnu in May

Minimum:

36.9°F

Average:

38.8°F

Maximum:

41.4°F

Sea water temperature in Ruhnu today

As of now, in Ruhnu, the water temperature is 45.5°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 3.7°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 rise considerably.

Recent sea temperature and forecast

Today's water temperature is notably higher than the average recorded over the past two weeks, indicating a significant warming trend. It is also close to the historical minimum temperature for this date. The maximum temperature recorded for this date was 55.7°F on 2018, while the historical minimum was 45.3°F on 2021.

latest data

last year

Over the last two weeks, the water temperature has stayed slightly lower than historical averages for those days. The forecast for the upcoming week suggests a gradual increase. The average temperature is expected to rise up to 47.9°F, with minimum temperature starting at 46.5°F, while the maximum might reach 49.2°F.

Daily water temperature in Ruhnu

Date	Current Year actual* / forecast**	last year	10 years average
May 8	41.4°F	41.2°F	42.6°F
May 9	41.1°F	41.0°F	43.6°F
May 10	41.7°F	41.5°F	44.1°F
May 11	44.5°F	42.4°F	45.0°F
May 12	42.4°F	42.6°F	45.2°F
May 13	41.8°F	43.2°F	45.6°F
May 14	42.4°F	43.2°F	46.2°F
May 15	43.3°F	43.7°F	47.2°F
May 16	45.8°F	44.1°F	47.9°F
May 17	43.2°F	43.4°F	47.8°F
May 18	44.5°F	43.1°F	47.7°F
May 19	45.2°F	43.0°F	47.4°F
May 20	44.5°F	45.0°F	47.9°F
May 21	44.9°F	45.5°F	48.5°F
May 22	45.5°F	45.5°F	49.2°F
May 23	46.5°F	45.9°F	50.2°F
May 24	46.9°F	44.0°F	50.6°F
May 25	48.1°F	45.5°F	51.8°F
May 26	48.1°F	48.1°F	51.9°F
May 27	48.2°F	48.6°F	52.0°F
May 28	48.2°F	48.7°F	52.0°F
May 29	49.2°F	49.6°F	52.9°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 Ruhnu by month

In an average year, Ruhnu offers no days when the water temperature is warm enough to swim comfortably.

The warmest water in Ruhnu was recorded on July 17, 2021, reaching a 77.4°F. While the coldest temperature occurred on February 1, 2026, dipping to 32.0°F. The average readings by season are 37.7°F in Winter, 39.5°F in Spring, 63.7°F in Summer, and 54.6°F in Autumn.