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 10.81°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.

United States > Petersburg

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.

51.5

°F

August 15, 07:24

Trend:

decreasing

Yesterday:

52.4°F

Tomorrow:

51.1°F

Sunrise:

05:20

Sunset:

20:32

Day Length:

15 h. 12 min.

Petersburg in August

Minimum:

39.4°F

Average:

41.0°F

Maximum:

42.6°F

Sea water temperature in Petersburg today

As of now, in Petersburg, the water temperature is 51.5°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 3.3°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 fall 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 is also close to the historical minimum temperature for this date. The maximum temperature recorded for this date was 56.2°F on 2017, while the historical minimum was 53.3°F on 2022.

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. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 50.8°F, the minimum temperature may reach 50.3°F, and the maximum might stay at 51.1°F.

Daily water temperature in Petersburg

Date	Current Year actual* / forecast**	last year	10 years average
Aug 1	52.7°F	54.4°F	54.1°F
Aug 2	52.2°F	54.8°F	54.4°F
Aug 3	53.0°F	54.6°F	54.6°F
Aug 4	53.2°F	54.7°F	54.4°F
Aug 5	52.2°F	54.8°F	54.2°F
Aug 6	50.1°F	54.4°F	54.2°F
Aug 7	49.9°F	54.4°F	54.6°F
Aug 8	50.8°F	55.4°F	55.1°F
Aug 9	51.0°F	55.6°F	55.3°F
Aug 10	51.8°F	55.6°F	55.3°F
Aug 11	52.1°F	55.1°F	54.8°F
Aug 12	50.4°F	55.1°F	54.9°F
Aug 13	53.0°F	55.1°F	55.2°F
Aug 14	52.4°F	53.7°F	54.7°F
Aug 15	51.5°F	53.6°F	54.8°F
Aug 16	51.1°F	53.5°F	54.4°F
Aug 17	50.9°F	53.3°F	54.2°F
Aug 18	50.9°F	53.3°F	54.2°F
Aug 19	50.8°F	52.8°F	54.1°F
Aug 20	50.9°F	52.9°F	54.2°F
Aug 21	50.9°F	53.0°F	54.2°F
Aug 22	50.3°F	51.6°F	53.6°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, 42.9°F in Spring, 52.9°F in Summer, and 46.3°F in Autumn.