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Weather in Porto Alegre for September 2026

Your guide to Porto Alegre weather in September - trends and predictions

    Temperatures

  • In general, the average temperature in Porto Alegre at the beginning of September is 21.7 °C. As the month progressed, temperatures tended to moderately rise, reaching an average of 23.3 °C by the end of September.

    • Rain 🌧️

  • Porto Alegre experiences moderate rainfall in September, with an average of 8 rainy days and a total precipitation of 77.7 mm.

Average dry days
22
Dry days
Average rainy days
8
Rainy days
Average snowy days
0
Snow days
Average temperatures
25°/15°
Temperatures
Average wind speed
16 km/h
Avg max wind
Average humidity
73 %
Avg humidity

Porto Alegre Weather September

Move between months or click on a day
August
October
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Patchy rain possible
25°
2
Partly cloudy
24°
3
Sunny
25°
4
Light rain shower
22°
5
Patchy rain possible
14°
6
Overcast
19°
7
Sunny
23°
8
Partly cloudy
20°
9
Thundery outbreaks possible
25°
10
Sunny
29°
11
Sunny
29°
12
Patchy rain possible
20°
13
Light rain shower
22°
14
Light rain shower
22°
15
Patchy rain possible
20°
16
Patchy rain possible
22°
17
Sunny
25°
18
Cloudy
26°
19
Light rain shower
30°
20
Moderate rain
25°
21
Cloudy
24°
22
Sunny
26°
23
Sunny
28°
24
Partly cloudy
22°
25
Patchy rain possible
21°
26
Light rain shower
21°
27
Light rain shower
23°
28
Cloudy
22°
29
Sunny
26°
30
Overcast
28°

Temperatures trend during September in Porto Alegre

See the weather trend as well as the moving average line

September weather in Porto Alegre day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Patchy rain possible
Patchy rain possible
 25° /14° 0.1 mm 7
2 Sept. Partly cloudy
Partly cloudy
 24° /14° 0.2 mm 8
3 Sept. Sunny
Sunny
 25° /15° 1.4 mm 7
4 Sept. Light rain shower
Light rain shower
 22° /11° 19.5 mm 6
5 Sept. Patchy rain possible
Patchy rain possible
 14° /10° 14.5 mm 5
6 Sept. Overcast
Overcast
 19° /8° 0 mm 6
7 Sept. Sunny
Sunny
 23° /11° 0 mm 7
8 Sept. Partly cloudy
Partly cloudy
 20° /14° 12.8 mm 6
9 Sept. Thundery outbreaks possible
Thundery outbreaks possible
 25° /16° 5.9 mm 7
10 Sept. Sunny
Sunny
 29° /15° 0 mm 9
11 Sept. Sunny
Sunny
 29° /14° 0 mm 8
12 Sept. Patchy rain possible
Patchy rain possible
 20° /14° 0.4 mm 6
13 Sept. Light rain shower
Light rain shower
 22° /13° 3.4 mm 7
14 Sept. Light rain shower
Light rain shower
 22° /13° 0.7 mm 6
15 Sept. Patchy rain possible
Patchy rain possible
 20° /13° 2.1 mm 6
16 Sept. Patchy rain possible
Patchy rain possible
 22° /14° 0.2 mm 6
17 Sept. Sunny
Sunny
 25° /13° 0 mm 7
18 Sept. Cloudy
Cloudy
 26° /14° 0 mm 7
19 Sept. Light rain shower
Light rain shower
 30° /16° 2.1 mm 8
20 Sept. Moderate rain
Moderate rain
 25° /18° 16.4 mm 7
21 Sept. Cloudy
Cloudy
 24° /17° 27.4 mm 7
22 Sept. Sunny
Sunny
 26° /14° 13.4 mm 7
23 Sept. Sunny
Sunny
 28° /16° 0 mm 8
24 Sept. Partly cloudy
Partly cloudy
 22° /16° 0 mm 7
25 Sept. Patchy rain possible
Patchy rain possible
 21° /14° 0 mm 6
26 Sept. Light rain shower
Light rain shower
 21° /13° 4.9 mm 7
27 Sept. Light rain shower
Light rain shower
 23° /13° 4 mm 7
28 Sept. Cloudy
Cloudy
 22° /14° 3.4 mm 6
29 Sept. Sunny
Sunny
 26° /13° 0 mm 8
30 Sept. Overcast
Overcast
 28° /16° 1.1 mm 7
Next
Important Notice
Our weather forecast for Porto Alegre in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Porto Alegre forecast closer to your planned date for the most up-to-date weather information.
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Porto Alegre in September - FAQ

What are the expected maximum and minimum temperatures in Porto Alegre during September?

During September, expect a variety of temperatures with highs around 25° and lows near 15°, suitable for diverse activities and preferences.

How much rainfall should be expected in Porto Alegre during September?

Moderate rainfall is anticipated in Porto Alegre during September, with a total of 77.7 mm spread over approximately 8 days. Considering plans for rainy days is advisable.

What are the typical wind conditions in Porto Alegre during September?

The average wind speed in Porto Alegre during September is 16 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Porto Alegre

Explore the daily rainfall trends and prepare for Porto Alegres September weather 💧
Typically, Porto Alegre has 8 rainy days in September with a total of 77.7 mm of rainfall.

UV exposure in Porto Alegre during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

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Location coordinates Where is Porto Alegre?

Get accurate weather forecasts for Porto Alegre, located at latitude -30.033 and longitude -51.23. Stay updated with localized weather information tailored for Porto Alegre.

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