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Sesimbra Weather in September
With daytime temperatures of 23°C (73°F) and nighttime lows of 18°C (64°F), September in Sesimbra brings high temperatures during the day. The excellent weather makes it an appealing time to visit.
Rainfall in Sesimbra in September
Climate statistics over the past 30 years suggest around 5 days of rain, with 29 mm (1.1 in) average for the month. The odd shower may pass through, but it usually doesn't amount to much. A largely dry month overall.
Temperature in Sesimbra in September
September is a excellent month in Sesimbra, with 23°C (73°F) during the day and 18°C (64°F) at night. This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. With lows of 18°C (64°F), nights are cool. If you're out after dark, an extra layer will keep you comfortable. The cooler air at night is also great for getting a good rest.
Sunshine in Sesimbra in September
Expect sunny days throughout the month, with an estimated 280 hours of sunshine. This makes it a pleasant time to visit Sesimbra.So this is a great month to visit if you prefer dry days with pleasant temperatures.
Sesimbra Temperature in September
Min Temperature
18°C (64°F)
Max Temperature
23°C (73°F)
Chance of Rain
18%
Precipitation
29 mm (1.1 in)
Rainy days
5 days
Sunshine
280 hours *
Percentage Sunshine
75% *
* Data from: Lisbon, Portugal (30 KM, 18 Miles).
Sesimbra Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Sesimbra - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Sesimbra typically stay consistent throughout September, with daily highs averaging around 23°C (73°F). Nights are pleasant, with lows around 17°C (63°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 Sesimbra in September
Browse day-by-day weather records for Sesimbra spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Sesimbra historical weather extremes in September
Based on 50 years of weather observations in Sesimbra between 1976 and 2026, these are the recorded extremes.
- The warmest day in September was on September 5, 2016, with a maximum of 38°C (100°F).
- Sesimbra experienced its chilliest September day on September 26, 1992, reaching only 18°C (64°F).
- Sesimbra registered its coldest September night on September 23, 1979, with temperatures dropping to 11°C (52°F).
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 Sesimbra in September
For Sesimbra in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. Some rain is possible, so pack something to handle light showers. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.
What To Do in Sesimbra in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming10/10 -
Cycling10/10 -
Walking10/10 -
Barbeque9/10 -
Camping10/10 -
Outdoor sports10/10
Sesimbra 3-Day Forecast
More climate data for Sesimbra
See the full Sesimbra climate overview or explore weather in Portugal.
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