Porto in September
Find out everything about the water temperature in Porto in September. Average, minimum and maximum recorded temperatures as well as daily temperature in September for the last two years. Compare the current month's sea temperature data with other months of the year.
Water temperature in September
Minimum:
72.8 °F
Average:
77.7 °F
Maximum:
85.3 °F
Sea water temperature in Porto in September
In the city of Porto, the month of September is a great time for swimming. The minimum recorded temperature during this month was 72.8°F on September 30, 2018, with an average temperature being 77.7°F and a maximum temperature reaching 85.3°F on September 3, 2026.
| Date | 10 years average | 2026 | 2025 |
|---|---|---|---|
| Sep 1 | 80.4°F | 85.2°F | 80.2°F |
| Sep 2 | 80.2°F | 85.2°F | 80.2°F |
| Sep 3 | 80.2°F | 85.3°F | 80.0°F |
| Sep 4 | 79.9°F | 85.1°F | 79.2°F |
| Sep 5 | 79.6°F | 84.6°F | 79.6°F |
| Sep 6 | 79.4°F | 84.6°F | 79.5°F |
| Sep 7 | 79.2°F | 83.9°F | 80.0°F |
| Sep 8 | 79.1°F | 83.8°F | 79.2°F |
| Sep 9 | 79.0°F | 84.0°F | 79.6°F |
| Sep 10 | 78.9°F | 84.0°F | 79.3°F |
| Sep 11 | 78.7°F | 83.6°F | 78.8°F |
| Sep 12 | 78.6°F | 83.2°F | 79.1°F |
| Sep 13 | 78.4°F | 82.9°F | 78.8°F |
| Sep 14 | 78.2°F | 82.3°F | 79.2°F |
| Sep 15 | 78.0°F | 81.7°F | 78.9°F |
| Sep 16 | 77.7°F | 80.7°F | 79.0°F |
| Sep 17 | 77.6°F | 80.4°F | 79.3°F |
| Sep 18 | 77.5°F | 80.2°F | 78.9°F |
| Sep 19 | 77.1°F | 79.9°F | 78.1°F |
| Sep 20 | 77.1°F | 79.4°F | 78.3°F |
| Sep 21 | 76.6°F | 79.6°F | 78.2°F |
| Sep 22 | 76.3°F | 79.3°F | 78.0°F |
| Sep 23 | 76.2°F | 79.3°F | 78.2°F |
| Sep 24 | 76.1°F | 79.2°F | 77.8°F |
| Sep 25 | 76.0°F | 79.0°F | 77.7°F |
| Sep 26 | 75.6°F | 78.7°F | 77.2°F |
| Sep 27 | 75.2°F | 78.3°F | 77.1°F |
| Sep 28 | 74.9°F | 78.0°F | 76.5°F |
| Sep 29 | 74.8°F | 77.8°F | 76.3°F |
| Sep 30 | 74.7°F | 77.7°F | 75.8°F |
In Porto, the months June through September offer comfortable swimming conditions, which amounts to 119 swimming days.
The warmest water in Porto was recorded on July 25, 2023, reaching a 86.4°F. While the coldest temperature occurred on March 13, 2022, dipping to 56.0°F. The average readings by season are 60.5°F in Winter, 61.7°F in Spring, 78.7°F in Summer, and 72.5°F in Autumn.
September's average temperature is a slight drop from August's average of 81.3°F. In October, the temperature is expected to decrease further, potentially averaging around 72.1°F.
