Portimão, Algarve weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Excellent
Best time to visit: June – September
What is the weather like in Portimão, Algarve in September?
In September, Portimão, Algarve is hot: daytime highs average 27 °C, and nights cool down to about 18 °C. The sea averages 19.9 °C – bracing, so a wetsuit helps for longer swims. With around 10 hours of sunshine a day, there is plenty of sun. Rain is rare: about 3 days bring 21 mm in total. On about 6 days the thermometer climbs to 30 °C or more. All in all, September is an excellent month for a holiday in Portimão, Algarve.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 85 | 85 | 66 |
| Day | 30° | 27° | 24° |
| Night | 19° | 18° | 16° |
| Sea | 20° | 20° | 20° |
| Sun | 11 h | 10 h | 8 h |
| Rain days | 0 | 3 | 8 |
More details for September
- Daylight
- 12 h 29 min07:15 – 19:44
- UV index
- 7 · highclear sky, noon (estimate)
- Muggy days
- 2 daysdew point 18 °C or more
- Wind
- 20 km/haverage daily peak
- Cloud cover
- 34 %on average
- Hot days
- 6 days30 °C or more
- Time zone
- UTC+1Europe/Lisbon
How the score comes together
- Temperatureweight 35 %100 %
- Seaweight 25 %41 %
- Sunshineweight 20 %100 %
- Few rainy daysweight 20 %100 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in September
- Wetsuit for longer swims
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
Portimão, Algarve in September: quick answers
Is Portimão, Algarve hot in September?
Yes. In September, Portimão, Algarve is hot: daytime highs average 27 °C and nights stay around 18 °C. On about 6 days the thermometer climbs to 30 °C or more.
Can you swim in Portimão, Algarve in September?
Only if you don't mind cold water: in September the sea averages just 19.9 °C. Comfortable swimming temperatures are not reached at any time of year.
Does it rain much in Portimão, Algarve in September?
Rain is rare: about 3 days bring 21 mm in total.
Portimão, Algarve month by month
The whole year in Portimão, AlgarveAll destinations: Portugal
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, GeoNames (CC BY 4.0)