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Portimão Weather in September
Portimão in September averages 26°C (79°F) during the day and 18°C (64°F) at night. This is part of the summer season. Some rainfall is to be expected.
Rainfall in Portimão in September
You can expect rain on around 3 days based on historical patterns, with 22 mm (0.9 in) average for the month. Although rain is not especially frequent, individual showers can still be quite heavy.
Temperature in Portimão in September
September tends to be one of the excellent months in Portimão, with 26°C (79°F) in the afternoon and 18°C (64°F) overnight. September is part of summer. Overall, the month follows a fairly predictable daily temperature pattern. With overnight lows of 18°C (64°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.
Sunshine in Portimão in September
With approximately 266 hours of sunshine, the days are filled with clear skies. It makes it a perfect month for being outside.If you're inclined towards comfortable temperatures and drier conditions, September is a good time to visit Portimão.
Portimão Temperature in September
Min Temperature
18°C (64°F)
Max Temperature
26°C (79°F)
Chance of Rain
9%
Precipitation
22 mm (0.9 in)
Rainy days
3 days
Sunshine
266 hours
Percentage Sunshine
Portimão Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Portimão - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Portimão typically stay consistent throughout September, with daily highs averaging around 26°C (79°F). Nights are pleasant, with lows around 18°C (64°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather records for Portimão in September
Browse day-by-day weather records for Portimão spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Portimão historical weather extremes in September
Our historical data for Portimão spans 1976 to 2026, revealing these weather extremes.
- On September 27, 1983, temperatures climbed to 37°C (99°F), marking the warmest September day on record.
- The coldest September day was on September 22, 1994, with a maximum of 19°C (66°F).
- Nighttime temperatures dropped to 11°C (52°F) on September 26, 1982, marking the coldest September night on record.
Best Places in Portugal in September
Find out more about the weather in Portugal and which places have the best travel conditions in this month. See all of Portugal in September →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Portimão in September
Warm but pleasant conditions in Portimão in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. Light rain is possible, so consider bringing a small umbrella or rain jacket. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.
What To Do in Portimão in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming10/10 -
Cycling8/10 -
Walking8/10 -
Barbeque10/10 -
Camping10/10 -
Outdoor sports8/10
Portimão 3-Day Forecast
More climate data for Portimão
See the full Portimão climate overview or explore weather in Portugal.
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Where to go in September - average daytime high across popular destinations.
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