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 5.08°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.

41.1

°F

May 9, 18:23

Trend:

stable

Yesterday:

41.4°F

Tomorrow:

41.6°F

Sunrise:

05:18

Sunset:

21:30

Day Length:

16 h. 12 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 41.1°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 2.7°F lower than the average recorded on this particular day in recent years. The sea temperature remains approximately unchanged from yesterday. According to the forecast, we expect the temperature to rise a bit.

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 49.5°F on 2016, while the historical minimum was 40.2°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 43.4°F, with minimum temperature starting at 41.6°F, while the maximum might reach 45.4°F.

Daily water temperature in Ruhnu

Date	Current Year actual* / forecast**	last year	10 years average
Apr 25	39.7°F	41.1°F	39.1°F
Apr 26	39.1°F	41.1°F	39.5°F
Apr 27	38.2°F	40.8°F	39.4°F
Apr 28	37.8°F	41.0°F	39.8°F
Apr 29	37.5°F	40.6°F	39.9°F
Apr 30	37.5°F	41.2°F	39.9°F
May 1	38.6°F	41.0°F	40.6°F
May 2	40.3°F	41.3°F	40.9°F
May 3	40.1°F	41.4°F	41.2°F
May 4	39.4°F	41.8°F	41.3°F
May 5	40.6°F	42.1°F	42.0°F
May 6	40.6°F	41.5°F	42.1°F
May 7	40.6°F	41.7°F	42.7°F
May 8	41.4°F	41.2°F	42.6°F
May 9	41.1°F	41.0°F	43.9°F
May 10	41.6°F	41.5°F	44.3°F
May 11	42.4°F	42.2°F	45.1°F
May 12	42.8°F	42.7°F	45.5°F
May 13	43.3°F	43.2°F	46.0°F
May 14	44.0°F	43.2°F	46.7°F
May 15	44.8°F	43.7°F	47.5°F
May 16	45.4°F	44.1°F	48.1°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.