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 6.34°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.

43.4

°F

May 1, 15:58

Trend:

increasing

Yesterday:

42.9°F

Tomorrow:

43.5°F

Sunrise:

05:05

Sunset:

20:34

Day Length:

15 h. 29 min.

Petersburg in May

Minimum:

39.5°F

Average:

41.3°F

Maximum:

43.3°F

Sea water temperature in Petersburg today

As of now, in Petersburg, the water temperature is 43.4°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 0.7°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

Today's water temperature is notably higher than the average recorded over the past two weeks, indicating a significant warming trend. It is also close to the historical minimum temperature for this date. The maximum temperature recorded for this date was 45.1°F on 2024, while the historical minimum was 43.1°F on 2018.

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 suggests a gradual increase. The average temperature is expected to rise up to 44.0°F, with minimum temperature starting at 43.5°F, while the maximum might reach 44.3°F.

Daily water temperature in Petersburg

Date	Current Year actual* / forecast**	last year	10 years average
Apr 17	41.5°F	41.8°F	41.8°F
Apr 18	41.8°F	42.0°F	42.1°F
Apr 19	41.7°F	42.3°F	42.5°F
Apr 20	42.0°F	42.4°F	42.9°F
Apr 21	42.6°F	41.9°F	43.2°F
Apr 22	41.9°F	42.1°F	43.4°F
Apr 23	42.2°F	42.4°F	43.6°F
Apr 24	42.2°F	42.5°F	43.6°F
Apr 25	41.7°F	42.6°F	43.7°F
Apr 26	42.0°F	42.7°F	43.7°F
Apr 27	42.4°F	43.3°F	43.8°F
Apr 28	43.0°F	43.6°F	44.0°F
Apr 29	42.9°F	43.7°F	44.0°F
Apr 30	42.9°F	43.8°F	44.0°F
May 1	43.4°F	43.8°F	44.1°F
May 2	43.5°F	43.8°F	44.2°F
May 3	43.6°F	43.9°F	44.3°F
May 4	43.9°F	44.0°F	44.6°F
May 5	44.2°F	44.1°F	44.9°F
May 6	44.2°F	44.1°F	44.9°F
May 7	44.2°F	44.2°F	44.9°F
May 8	44.3°F	44.3°F	45.0°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.