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 4.37°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.

39.9

°F

April 7, 15:18

Trend:

increasing

Yesterday:

39.6°F

Tomorrow:

40.0°F

Sunrise:

06:05

Sunset:

19:44

Day Length:

13 h. 39 min.

Petersburg in April

Minimum:

39.5°F

Average:

41.3°F

Maximum:

43.0°F

Sea water temperature in Petersburg today

As of now, in Petersburg, the water temperature is 39.9°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 1.3°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

The water temperature today is above average for the last two weeks, showing a small increase in temperature. It is also close to the historical minimum temperature for this date. The maximum temperature recorded for this date was 43.8°F on 2016, while the historical minimum was 40.2°F on 2020.

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 40.0°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
Mar 24	39.7°F	41.3°F	40.8°F
Mar 25	39.1°F	41.1°F	40.7°F
Mar 26	39.1°F	41.1°F	40.7°F
Mar 27	39.1°F	40.0°F	40.5°F
Mar 28	39.1°F	40.7°F	40.6°F
Mar 29	39.0°F	40.4°F	40.5°F
Mar 30	38.6°F	41.0°F	40.6°F
Mar 31	38.8°F	40.6°F	40.6°F
Apr 1	39.1°F	40.7°F	40.8°F
Apr 2	39.5°F	40.7°F	41.0°F
Apr 3	39.4°F	41.3°F	41.0°F
Apr 4	39.5°F	41.3°F	41.0°F
Apr 5	39.6°F	40.9°F	40.9°F
Apr 6	39.6°F	41.0°F	41.0°F
Apr 7	39.9°F	41.1°F	41.2°F
Apr 8	40.0°F	41.2°F	41.3°F
Apr 9	40.0°F	41.2°F	41.3°F
Apr 10	40.0°F	41.2°F	41.4°F
Apr 11	39.9°F	41.4°F	41.2°F
Apr 12	40.0°F	41.5°F	41.4°F
Apr 13	40.1°F	41.5°F	41.4°F
Apr 14	40.4°F	41.7°F	41.7°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 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.