Portimão weather in September
September in Portimão: warm, dry, with clean air — an excellent time to visit.
#4 of 12 months in Portimão · #140 of 897 destinations to visit in September · comfort 91/100 (tier S)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Portimão in September
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Portimão climate normals — September
| Daytime high | 27°C / 81°F | 🌤 warm |
|---|---|---|
| Nighttime low | 18°C / 65°F | |
| Rainfall | 19 mm / 0.7 in | ☀️ dry |
| Rainy days | 3 days | |
| Humidity | 73% | 💧 humid |
| Dew point | 16°C / 61°F | |
| Sunshine | 10.9 h/day | |
| Daylight | 12.4 h | |
| Wind | 18 km/h / 11 mph | |
| Air quality (US AQI) | 36 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Portimão in September — FAQ
- Is September a good time to visit Portimão?
- September in Portimão: warm, dry, with clean air — an excellent time to visit. It ranks #4 of 12 months for Portimão on SeasonMap's comfort score (91/100).
- What is the weather like in Portimão in September?
- In September, Portimão averages a daily high of 27.3°C and a low of 18.2°C, with about 18.5 mm of rain over roughly 2.6 rainy days.
- What is the air quality in Portimão in September?
- Portimão has a mean US Air Quality Index of about 36 in September.