yearsofweather

Lisbon in September:
comfortably warm, little rain

Lisbon, Portugal · Records from 2006 to 2025. Not a forecast.

Mean high27°Hottest day 35.2° (2016)
Mean low18°Coldest night 13.6° (2024)
Rain days4 days0-14 by year
Rainfall36mmDaylight 13.0 → 11.8 h
Lisbon's 12 months iBest: May to July
Trip types Beach Poorcool seaSightseeing on foot Goodmild and mostly dry
Sea temperature18.9°17.3-20.2° by year (last 6)
Sunrise / sunset (15th)07:17 / 19:46Daylight 13.0 → 11.8 h

Lisbon in September

Summer warmth lingers while beach crowds thin out. The sea is among its warmest of the year, which makes swimming pleasant. Rain is still uncommon. You begin to want a layer in the evening.

September in Lisbon was on the warm side, averaging 27°C by day and 18°C at night. Out of 30 days, an average of 4 saw rain. In 2010, September had no rain day at all; in 2014 it had 14.

About 3 days a month still climbed past 30°C, the ones where you looked for shade.

Hurricanes i

1 of the last 20 years had a tropical storm pass within 300 km this month.

  • Alpha (2020), 95 km away tropical storm
1 2 3 4 5 6 7 8 19 110 11 12

Date by date i

‹ August September 2027 October ›
Sun
Mon
Tue
Wed
Thu
Fri
Sat
Week
1-4rain on 5% of days27° 18°
5-11rain on 5% of days27° 18°
12-18rain on 15% of days27° 18°
19-25rain on 16% of days26° 18°
26-30rain on 15% of days26° 17°

0-5/206-8/209-11/2012-20/20

1-4rain on 5% of days27° 18°
5-11rain on 5% of days27° 18°
12-18rain on 15% of days27° 18°
19-25rain on 16% of days26° 18°
26-30rain on 15% of days26° 17°
Tap another date to change

200635mm
20073mm
20083mm
2009none
2010none
2011none
2012none
2013none
20142mm
2015none
2016none
2017none
2018none
201910mm
2020none
2021none
2022none
20232mm
2024none
2025none
Holidays in September (2027)
  • September 6 Labor Day

1 US holidays (flights fill up)

Your trip dates, the past 20 years

Trip dates ~

You can also click two dates on the axis. Hover a cell to see that day's rain.
Trip rain days Month rain days
2006
0 d 5 d
2007
0 d 6 d
2008
1 d 5 d
2009
0 d 1 d
2010
0 d 0 d
2011
0 d 1 d
2012
0 d 4 d
2013
0 d 5 d
2014
3 d 14 d
2015
0 d 1 d
2016
0 d 1 d
2017
0 d 0 d
2018
0 d 1 d
2019
0 d 2 d
2020
0 d 3 d
2021
0 d 4 d
2022
0 d 5 d
2023
2 d 7 d
2024
0 d 3 d
2025
1 d 2 d
Years with rain
Tap a date to start, tap another to end. Each cell is that date in one year.
'06'07'08'09'10'11'12'13'14'15'16'17'18'19'20'21'22'23'24'25
of 20
1
0
1
2
1
1
2
1
1
1
0
1
5
3
3
4
3
2
3
4
6
1
5
1
3
2
3
3
4
3
Rain days on trip
00100000300000000201

No rain1-9 mm10 mm or more Dates outside your trip are dimmed.

One row per year, one cell per day. 2010 had 0 rain days, 2014 had 14.

Lisbon through the year

MonthHighLowRain daysRainfallSea
January 15°9°10 days91mm 16°
February 16°10°9 days83mm 15°
March 18°11°8 days90mm 15°
April 21°13°8 days73mm 16°
MayGood 24°15°4 days45mm 17°
JuneGood 26°17°3 days15mm 18°
JulyGood 28°18°1 day2mm 18°
August 29°19°1 day4mm 18°
September 27°18°4 days36mm 19°
October 23°16°8 days98mm 18°
November 18°12°10 days132mm 18°
December 16°10°9 days102mm 16°

Common questions

Does it rain a lot in Lisbon in September?

Over the past 20 years September averaged 4 rain days (1 mm or more) out of 30. Individual years ran from 0 in the driest to 14 in the wettest.

What should I wear in Lisbon in September?

Days averaged 27°C and nights 18°C. Pack T-shirts, a light layer for the evenings, and sunscreen plus a hat.

Can you swim in Lisbon in September?

Sea surface temperature averaged 18.9°C in September, more for a paddle than a swim. Year to year it ranged 17.3-20.2°C. Check local flags for waves and jellyfish on the day.

Is September a good time to visit Lisbon?

On warmth and rain days alone, Lisbon's easiest months were May to July. September ranked 4 of 12.