All data are in degrees Fahrenheit

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Water temperature in Porto Alegre

Detailed information about the current water temperature in Porto Alegre. 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.
Sea temperature in Porto Alegre now

70.9

°F

April 30, 12:00

Trend:

decreasing

Yesterday:

72.0°F

Tomorrow:

70.6°F

Sunrise:

06:53

Sunset:

17:51

Day Length:

10 h. 58 min.

Porto Alegre in May

Minimum:

76.8°F

Average:

79.4°F

Maximum:

81.0°F

Sea water temperature in Porto Alegre today

As of now, in Porto Alegre, the water temperature is 70.9°F. Swimming in water of this temperature is seen as relatively warm and enjoyable for some individuals, although many might find it slightly too cool. Today's reading is 0.5°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 considerably lower than the average registered over the last two weeks, indicating a slight cooling trend. It also aligns closely with the historical average temperature for this date, indicating a typical climate pattern. The maximum temperature recorded for this date was 76.5°F on 2018, while the historical minimum was 68.2°F on 2017.

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 maximum recorded over the past years. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 69.9°F, the minimum temperature may reach 69.4°F, and the maximum might stay at 70.6°F.

Daily water temperature in Porto Alegre

Date Current Year

actual* / forecast**

last year 10 years average
Apr 16 76.4°F 73.6°F 73.4°F
Apr 17 76.3°F 73.4°F 73.0°F
Apr 18 76.9°F 73.3°F 72.6°F
Apr 19 75.8°F 72.9°F 72.2°F
Apr 20 75.7°F 72.7°F 71.8°F
Apr 21 74.3°F 72.9°F 71.8°F
Apr 22 73.9°F 72.4°F 72.0°F
Apr 23 74.2°F 71.7°F 72.1°F
Apr 24 73.2°F 71.6°F 72.2°F
Apr 25 73.1°F 72.0°F 72.5°F
Apr 26 73.4°F 72.7°F 72.6°F
Apr 27 73.8°F 72.2°F 72.4°F
Apr 28 73.5°F 72.1°F 72.1°F
Apr 29 72.0°F 72.1°F 71.9°F
Apr 30 70.9°F 71.2°F 71.3°F
May 1 70.6°F 70.6°F 71.1°F
May 2 70.3°F 69.8°F 70.8°F
May 3 70.1°F 69.2°F 70.5°F
May 4 69.7°F 69.9°F 70.2°F
May 5 69.4°F 69.2°F 69.9°F
May 6 69.8°F 70.6°F 70.3°F
May 7 69.4°F 71.2°F 69.8°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 Porto Alegre by month

In Porto Alegre, the months December through April offer comfortable swimming conditions, which amounts to 152 swimming days.
The warmest water in Porto Alegre was recorded on March 5, 2025, reaching a 86.6°F. While the coldest temperature occurred on July 5, 2025, dipping to 54.7°F. The average readings by season are 79.3°F in Winter, 73.4°F in Spring, 60.7°F in Summer, and 68.9°F in Autumn.