Weather in Porto Alegre: September
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Average day temperature: | 70.5°F |
| Average night temperature: | 60.2°F | |
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Sea water temperature: | 64.4°F |
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Number of sunny days: | 11 days |
| Day length: | 11.5 - 12.4 hours | |
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Number of rainy days: | 5 days |
| Precipitation totals: | 2.9 in. | |
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forecast
| Porto Alegre |
temperature
| Porto Alegre |
Air temperature in September, °F
The highest day temperature during September of 2025 was 82°F. At the same time the lowest night temperature was 49°F. Daily and nightly averages during September were 69.8°F and 58.3°F.
Sea water temperature in Porto Alegre in September, °F
The average sea water temperature in September of 2025 was 64.3°F. The highest and lowest sea temperatures during the month were 65.8°F and 62.4°F.
Number of sunny, partly cloudy and cloudy days in September is almost equal.
Precipitation total in September, in.
Precipitation total value in Porto Alegre in September is 2.9 in. Other months of the year show relatively similar values.
The average wind speed value in September is 6.3 mph
This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in September is: 6.4.
Best time for vacation in Porto Alegre
Porto Alegre on a weather map
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