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 4.78°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.

40.6

°F

February 5, 05:30

Trend:

increasing

Yesterday:

40.4°F

Tomorrow:

40.7°F

Sunrise:

07:42

Sunset:

16:31

Day Length:

8 h. 49 min.

Petersburg in February

Minimum:

38.7°F

Average:

41.2°F

Maximum:

42.7°F

Sea water temperature in Petersburg today

As of now, in Petersburg, the water temperature is 40.6°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 about the same as 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 notably higher than the average recorded over the past two weeks, indicating a significant warming 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 41.5°F on 2016, while the historical minimum was 39.2°F on 2025.

latest data

last year

Observations from the last two weeks indicate that the water temperature was in proximity to the lowest values recorded on those days in the past. Over the next week, the forecast shows a steady trend, with temperatures staying close to the average of 40.6°F. Both minimum and maximum temperatures expected to be close to the average, offering a week of stable water conditions.

Daily water temperature in Petersburg

Date	Current Year actual* / forecast**	last year	10 years average
Jan 22	37.3°F	40.5°F	40.1°F
Jan 23	36.9°F	40.6°F	40.2°F
Jan 24	36.5°F	40.7°F	40.2°F
Jan 25	37.9°F	40.7°F	40.4°F
Jan 26	38.0°F	40.5°F	40.4°F
Jan 27	38.5°F	40.4°F	40.5°F
Jan 28	39.2°F	40.6°F	40.4°F
Jan 29	39.6°F	40.7°F	40.5°F
Jan 30	39.8°F	40.8°F	40.6°F
Jan 31	39.8°F	40.9°F	40.7°F
Feb 1	39.0°F	41.0°F	40.7°F
Feb 2	39.7°F	39.5°F	40.6°F
Feb 3	39.9°F	39.5°F	40.6°F
Feb 4	40.4°F	39.6°F	40.5°F
Feb 5	40.6°F	39.2°F	40.6°F
Feb 6	40.7°F	39.0°F	40.7°F
Feb 7	40.7°F	39.3°F	40.8°F
Feb 8	40.8°F	39.1°F	40.8°F
Feb 9	40.7°F	38.8°F	40.8°F
Feb 10	40.6°F	39.0°F	40.6°F
Feb 11	40.4°F	39.1°F	40.5°F
Feb 12	40.1°F	38.8°F	40.1°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 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.