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 2.49°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.

36.5

°F

January 24, 12:26

Trend:

stable

Yesterday:

36.9°F

Tomorrow:

36.6°F

Sunrise:

08:05

Sunset:

16:04

Day Length:

7 h. 59 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 36.5°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 4.0°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 stay about the same.

Recent sea temperature and forecast

Today's water temperature is considerably 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 42.2°F on 2016, while the historical minimum was 39.4°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. Over the next week, the forecast shows a steady trend, with temperatures staying close to the average of 36.6°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 10	39.3°F	40.1°F	40.6°F
Jan 11	39.4°F	40.2°F	40.6°F
Jan 12	39.6°F	40.2°F	40.5°F
Jan 13	39.7°F	40.0°F	40.4°F
Jan 14	39.7°F	40.1°F	40.2°F
Jan 15	39.8°F	40.2°F	40.2°F
Jan 16	39.8°F	40.2°F	40.3°F
Jan 17	39.3°F	40.2°F	40.3°F
Jan 18	39.1°F	40.2°F	40.2°F
Jan 19	38.6°F	40.2°F	40.0°F
Jan 20	38.3°F	40.3°F	40.1°F
Jan 21	38.1°F	40.4°F	40.2°F
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	40.5°F
Jan 25	36.6°F	40.7°F	40.6°F
Jan 26	36.6°F	40.5°F	40.6°F
Jan 27	36.6°F	40.4°F	40.7°F
Jan 28	36.5°F	40.6°F	40.6°F
Jan 29	36.5°F	40.7°F	40.6°F
Jan 30	36.7°F	40.8°F	40.7°F
Jan 31	36.8°F	40.9°F	40.8°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 23, 2026, dipping to 36.9°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.