Portugal
Lisbon in September
In September, Lisbon averages a daytime high of 26 °C and a night-time low of 17 °C, with about 36 mm of rain over the month. By the measure used here it is one of the most comfortable months to visit; they run March to September.
- Average high
- 26 °C
- Average low
- 17 °C
- Rain in the month
- 36 mm
- Daylight on 15 Sep
- 12 h 20 min
- Comfortable month
- Yes
- Places to stay
- 366
When to go
How September compares with the rest of the year in Lisbon
September is tied for the 3rd warmest month in Lisbon by average daytime high; across the year the highs run from 15 °C to 29 °C and the lows from 8 °C to 18 °C. By day, September is 2 °C cooler than August, and October is 4 °C cooler than September.
September brings 36 mm of rain, less than the monthly average of 65 mm (775 mm a year); it is the 9th wettest month.
On 15 September the sun is up for about 12 h 20 min, against 9 h 30 min at the shortest and 14 h 50 min at the longest point of the year (calculated from the latitude, sunrise to sunset).
| Month | High | Low | Rain | Comfortable |
|---|---|---|---|---|
| January | 15 °C | 8 °C | 97 mm | |
| February | 16 °C | 9 °C | 85 mm | |
| March | 19 °C | 11 °C | 79 mm | Yes |
| April | 20 °C | 12 °C | 69 mm | Yes |
| May | 23 °C | 14 °C | 53 mm | Yes |
| June | 26 °C | 16 °C | 14 mm | Yes |
| July | 28 °C | 18 °C | 4 mm | Yes |
| August | 29 °C | 18 °C | 7 mm | Yes |
| September | 26 °C | 17 °C | 36 mm | Yes |
| October | 23 °C | 15 °C | 109 mm | |
| November | 18 °C | 12 °C | 116 mm | |
| December | 16 °C | 10 °C | 106 mm |
Comfortable means average daytime high between 18 °C and 29 °C and under 80 mm of rain in the month. Averages for 1991–2020 over the surrounding area, a grid square about 50 km across, so a coast or a nearby mountain can make the town itself warmer or cooler. Data: CRU TS v4.10, Climatic Research Unit, University of East Anglia (Open Database License).
When to go
Is September a good time to visit Lisbon?
Yes, by the measure used here: in September the average high of 26 °C is between 18 °C and 29 °C and the 36 mm of rain is under 80 mm. The comfortable months in Lisbon are March to September.
The measure is about weather for a city stay only; it says nothing about events, school holidays or prices.
When to go
Destinations near Lisbon that are comfortable in September
Within 300 km, nearest first, by the same measure.
Where to stay
Where to stay in Lisbon
This guide lists 366 places to stay in Lisbon: 5 chain properties with their details and own websites, and 361 hotels recorded in Wikidata. By straight-line distance from the centre: under 1 km, 136; 1–3 km, 179; 3–10 km, 51.
Sources: climate from CRU TS v4.10 (Climatic Research Unit, University of East Anglia; Open Database License), 1991–2020 averages; day length calculated from the latitude; places to stay from each operator's own public pages and Wikidata. How this guide is made.