September is an ideal time to visit Lisbon if you're seeking a destination with brilliant weather. Anticipate average maximum temperatures of +25°C and about 18 sunny days, ensuring you'll have ample opportunities to soak up the sunshine. It's worth noting, though, that there may be some rainfall, with approximately 34 mm of precipitation over an average of 5 rainy days. So, prepare your sunglasses, a beach towel, and great walking shoes, as it's most likely going to be amazing weather. Search flightsin one click on Avionero.
Average weather
☀️
+25°C
Avg. max. temperature
+13°C
Min.
+39°C
Max.
34 mm
Total precipitation
67%
Avg. humidity
3 m/s
Avg. wind
18 ☀️
Sunny Days
6 ⛅️
Cloudy
5 🌦
Rainy
Our opinion: Lisbon has great weather in September.
Average temperature in Lisbon in September
Here are the expected maximum, average and minimum temperatures in Lisbon for September based on the historical data.
Last Year
Historical Data
Going from a maximum of +34°C during the day to a minimum of +16°C during the night, the temperature in September averages around +26°C.
The average maximum temperature goes up 28% by the end of the month, compared with the beginning of the month, from +26°C to +31°C.
Is Lisbon warm or cold in September?
Lisbon is typically warm in September.
Maximum temperatures go down compared to the previous month from +27°C to +25°C. The minimum temperature also goes up from +18°C to +18°C.
It’s generally warm, but pack a long-sleeve shirt for evenings.
September is one of the warmest months in Lisbon, here is the comparison with other months:
Water temperature in Lisbon in September
Water in Lisbon in September is Fresh. It varies from +19°C to +21°C, with an average of +20°C.The air temperature averaging +25°C is higher than the water temperature.
The water temperature in September is one of the warmest of the entire year:
The warmest water temperatures in Lisbon are reached in October, when the average sea temperature rises to +20°C. The coldest water temperatures are in March, with an average of +15°C.
Can you swim in Lisbon in September?
Water temperature (+20°C) in Lisbon in September might be suited for short swims and acclimatized swimmers might find it refreshing.
🦭
Cold
Below +16°C
🏄♂️
Fresh
16°C - 21°C
🏊
Comfortable
21°C - 25°C
👙
Warm
25°C - 28°C
🔥
Very warm
+28°C and up
Think of bringing a full-body or shorty wetsuit (3mm-5mm thickness) to provide insulation and maintain body heat.
Climate in Lisbon in September
Lisbon weather looks like this, on average, in September and the surrounding months.
August
September
October
Avg. temperature
+27°C
+25°C
+22°C
Min. temperature
+15°C
+13°C
+9°C
Max. temperature
+41°C
+39°C
+34°C
Rainfall
4 mm
34 mm
93 mm
Wind
4 m/s
3 m/s
3 m/s
Avg. water temperature
+20°C
+20°C
+20°C
Humidity
65%
67%
73%
Air pressure
1016 HPa
1016 HPa
1016 HPa
Sunny days
22
18
14
Cloudy days
7
6
5
Rainy days
2
5
10
Snowy days
0
0
0
September weather is still as great as in August.It’s getting colder in September. From +27°C in the day, the average maximum temperature lowers to +25°C.Prepare for more rain. Average rainfall goes from 4 mm to 34 mm.Humidity rises from 65% to 67%.Winds are calmer in comparison to August, going down from 4 m/s to 3 m/s on average.The days becoming less sunny, going from 22 sunny days in August to 18 in September.
Next month (October) brings a further decline in the weather.
Wind speed in Lisbon in September based on historical data.
Last Year
Historical Data
The average wind speed is 5 m/s getting up to 13 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Lisbon is gradually decreasing during September, going from 5 m/s to 3 m/s over the course of the month.
Rain
Amount of rainfall in mm during September in Lisbon based on historical data.
Last Year
Historical Data
Typically, there is a 33% chance of rain on an average day in September, with total rainfall of approximately 194 mm. The maximum amount of rainfall per day is around 55 mm, which is considered heavy rain.September is a pretty wet month with over 10 rainy days, so don’t forget to pack an umbrella, raincoat, and a pair of galoshes.
Here’s how September is compared with other months in the amount of precipitation, total mm:
Lisbon wettest month is December, where a typical day has a 42% chance of precipitation and 122 mm of rainfall per day. July, on the other hand, is the driest month with a mere 6% chance of precipitation and 2 mm of rainfall per day.
How was the weather last September in Lisbon?
This is the weather in Lisbon in September 2023:
1 September
☀️
+26°C
2 September
☀️
+24°C
3 September
☀️
+25°C
4 September
🌧️
+22°C
5 September
☀️
+25°C
6 September
☀️
+25°C
7 September
☁️
+27°C
8 September
☁️
+25°C
9 September
☀️
+25°C
10 September
☀️
+24°C
11 September
☀️
+25°C
12 September
☀️
+26°C
13 September
☀️
+29°C
14 September
☀️
+30°C
15 September
☀️
+25°C
16 September
☀️
+24°C
17 September
☀️
+23°C
18 September
☀️
+23°C
19 September
☀️
+26°C
20 September
☀️
+23°C
21 September
☀️
+23°C
22 September
☀️
+23°C
23 September
☀️
+26°C
24 September
☀️
+29°C
25 September
☀️
+30°C
26 September
☀️
+29°C
27 September
☀️
+28°C
28 September
☀️
+29°C
29 September
☀️
+34°C
30 September
☀️
+31°C
In September 2023 Lisbon had 27 sunny days, 2 cloudy days, and 1 rainy days. The average maximum temperature was +26°C, with an absolute maximum of +34°C and a minimum of +22°C. The average humidity was 81%, with a maximum of 100% and a minimum of 40%. The average wind speed was 5 m/s, with a maximum of 25 m/s and a minimum of 0 m/s.
Are you planning a trip in September?
Climate Change over Years
This is how Lisbon climate have been changing during last 43 years period.
The climate in Lisbon in September has not changed much over the last 43 years.
The average temperature was the lowest in 1979 (+18°C) and the highest in 2017 (+22°C). The driest year was 1992 with only 298 mm of rainfall, and the wettest year was 2022 with 2338 mm.
FAQ
Frequently asked questions about the weather in Lisbon in September:
Is September a good time to visit Lisbon?
Yes, September is a great time to go to Lisbon, the weather couldn’t be better. Be ready to get outside, explore and enjoy. Check what other months that are a good time to visit Lisbon.
Can you sunbathe in Lisbon in September?
September is warm in Lisbon. You may enjoy some beach or pool time in the day, but pack something a tad warmer for the evening.
Can you swim in Lisbon in September?
In general, you can swim in Lisbon in September, if you want to, at an average water temperature of +20°C. But it will feel quite cool, and some precautions are necessary to ensure your comfort and safety.
Is Lisbon rainy in September?
Lisbon is usually dry in September. Plan your packing around outdoor activities and exploring.
Is it sunny in Lisbon in September?
The amount of sunny days in Lisbon during September varies; prepare for a mix of clouds and sun.
Other cities in Portugal
Check out the weather for other cities in Portugal.
For this page, we’ve looked at the typical weather in Lisbon, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.
