What is the current water temperature in Petersburg?

Q: What is the current water temperature in Petersburg?

As of now, in Petersburg, the water temperature is 4.0°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.

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Water temperature in Petersburg

Detailed information about the current water temperature in Petersburg. 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.

39.2

°F

March 17, 17:26

Trend:

increasing

Yesterday:

38.3°F

Tomorrow:

39.4°F

Sunrise:

07:02

Sunset:

18:59

Day Length:

11 h. 57 min.

Petersburg in March

Minimum:

39.2°F

Average:

41.3°F

Maximum:

42.9°F

Sea water temperature in Petersburg today

As of now, in Petersburg, the water temperature is 39.2°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 0.5°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 a bit.

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 42.6°F on 2016, while the historical minimum was 38.2°F on 2023.

latest data

last year

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 minimum recorded over the past years. The forecast for the upcoming week suggests a gradual increase. The average temperature is expected to rise up to 40.1°F, with minimum temperature starting at 39.4°F, while the maximum might reach 40.5°F.

Daily water temperature in Petersburg

Date	Current Year actual* / forecast**	last year	10 years average
Mar 3	39.0°F	39.6°F	39.9°F
Mar 4	39.6°F	39.8°F	40.1°F
Mar 5	39.5°F	39.8°F	40.1°F
Mar 6	40.3°F	40.0°F	40.1°F
Mar 7	41.0°F	40.3°F	40.2°F
Mar 8	40.8°F	40.5°F	40.3°F
Mar 9	39.7°F	40.6°F	40.2°F
Mar 10	39.7°F	40.4°F	40.0°F
Mar 11	39.6°F	40.2°F	39.8°F
Mar 12	39.5°F	40.0°F	39.7°F
Mar 13	38.8°F	39.8°F	39.5°F
Mar 14	38.5°F	39.9°F	39.5°F
Mar 15	38.1°F	39.6°F	39.3°F
Mar 16	38.3°F	39.7°F	39.3°F
Mar 17	39.2°F	39.6°F	39.7°F
Mar 18	39.4°F	39.8°F	39.9°F
Mar 19	39.8°F	40.2°F	40.3°F
Mar 20	40.0°F	40.6°F	40.5°F
Mar 21	40.3°F	40.9°F	40.8°F
Mar 22	40.4°F	41.2°F	40.9°F
Mar 23	40.5°F	41.4°F	41.0°F
Mar 24	40.4°F	41.3°F	40.9°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 Petersburg by month

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

The warmest water in Petersburg was recorded on July 7, 2019, reaching a 60.2°F. While the coldest temperature occurred on January 24, 2026, dipping to 36.5°F. The average readings by season are 40.9°F in Winter, 43.0°F in Spring, 53.0°F in Summer, and 46.3°F in Autumn.