Portugal Lisbon Weather in September — Climate Guide
September in Lisbon is Excellent
September is Excellent for Lisbon.
September is the sweet spot — late summer warmth + thinning crowds + dropping hotel rates. Daytime 26°C, nighttime 17°C, 12-hour daylight.
Beach still swimmable through September. Outdoor dining season continues. Pena Palace tickets easier than peak summer.
Travel score
Lisbon September Weather Stats
Avg High
26°C
Avg Low
17°C
Rainy Days
4
25mm total
Sunshine
9h
Daily avg
Humidity
65%
Comfortable
UV Index
7
High
Wind
11 km/h
Gusts 24
Sea Temp
20°C
Swimmable
Crowds
Busy
At attractions
September Sunrise & Sunset
Air Quality
PM2.5
11 μg/m³
PM10
20 μg/m³
Status
Good
Feels-Like Temperature & Wind
Feels like
Daytime
26°C
Nighttime
16°C
Humidity and wind affect how the actual temperature feels.
Wind
11 km/h
Max gust 24 km/h
Activities Recommended for September
September Travel Pros & Cons
Pros
- Best value-to-weather of the year
- Beach still warm
- Crowds thinning
Cons
- Days shortening (sunset 19:30 by month-end)
- Variable autumn weather possible
- Tourist sites still busy weekends
September Events & Festivals
- Hotel rates dropping from peak
- Beach still warm
- Crowds thinning
Lisbon in September — Full Picture
September is the sweet spot — late summer warmth + thinning crowds + dropping hotel rates. Daytime 26°C, nighttime 17°C, 12-hour daylight.
Beach still swimmable through September. Outdoor dining season continues. Pena Palace tickets easier than peak summer.
Best value-to-weather of the year.
What to Wear & What to Pack
T-shirts + light cardigan. Long pants for evenings. Sunglasses + sunscreen.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
19.3°C
12°C
8.7/mo
Summer (Jun·Jul·Aug)
27°C
17.7°C
1.7/mo
Autumn (Sep·Oct·Nov)
Current21.7°C
14°C
8/mo
Winter (Dec·Jan·Feb)
14.3°C
8.3°C
12.3/mo
Lisbon Monthly Weather Comparison
| Month | High | Low | Rain | Sun | Humid | UV | Crowd | Price |
|---|---|---|---|---|---|---|---|---|
| 14° | 8° | 14d·110mm | 4.6h | 76% | 2 | Quiet | Low season | |
| 15° | 8° | 11d·80mm | 5.9h | 73% | 3 | Quiet | Low season | |
| 17° | 10° | 10d·60mm | 6.9h | 70% | 4 | Moderate | Shoulder | |
| April (Best) | 19° | 12° | 9d·60mm | 8.1h | 67% | 5 | Busy | Peak |
| May (Best) | 22° | 14° | 7d·45mm | 9.6h | 64% | 7 | Busy | Peak |
| June (Best) | 25° | 17° | 3d·16mm | 11h | 64% | 8 | Very busy | Peak |
| July (Best) | 28° | 18° | 1d·4mm | 11.5h | 60% | 9 | Very busy | Peak |
| August (Best) | 28° | 18° | 1d·6mm | 11h | 60% | 9 | Very busy | Peak |
| September (Best) | 26° | 17° | 4d·25mm | 9h | 65% | 7 | Busy | Peak |
| 22° | 14° | 8d·80mm | 6.6h | 71% | 4 | Moderate | Shoulder | |
| 17° | 11° | 12d·130mm | 5h | 78% | 2 | Moderate | Shoulder | |
| 14° | 9° | 12d·110mm | 4.6h | 77% | 2 | Moderate | Peak |
View Other Months
Lisbon September Hotel Picks
Frequently Asked Questions
Is September a good time to visit Lisbon?
Lisbon in September is Excellent. Tourist crowds are busy and flight/hotel prices are peak.
What's the average temperature in Lisbon in September?
Lisbon September averages a high of 26°C and a low of 17°C.
Does it rain much in Lisbon in September?
Lisbon September averages 25mm of rainfall over about 4 rainy days.
What should I wear in Lisbon in September?
T-shirts + light cardigan. Long pants for evenings. Sunglasses + sunscreen.
What time are sunrise and sunset in Lisbon in September?
Lisbon September sunrise is 07:15 and sunset is 19:30, with 12h 15m of daylight.
What's the air quality like in Lisbon in September?
Lisbon September air quality (AQI) averages 34, rated Good. PM2.5 averages 11μg/m³.
What activities are recommended in Lisbon in September?
In September, Lisbon is great for Beach (still warm), Sintra Pena Palace, Outdoor terraces.
Is September peak season in Lisbon?
Lisbon September crowds are busy and prices are peak. Advance reservations are strongly recommended.
Best Months to Visit Lisbon
View Other Months
Why you can trust weather guide
Based in Chiang Mai for 8+ years, with 30+ countries visited across Southeast Asia, Japan, and Europe. Every detail in this guide is primary-source verified as of April 2026, with prices auto-refreshed via live exchange rate APIs. This isn't AI-generated boilerplate — it's written from the perspective of someone who has actually been there.