Portugal Porto Weather in September — Climate Guide
September in Porto is very-high
September is very-high for Porto.
BEST MONTH — Douro grape harvest active + ideal weather + post-summer crowds. Magical for cellars + Douro Valley.
Travel score
Porto September Weather Stats
Avg High
24°C
Avg Low
14°C
Rainy Days
6
60mm total
Sunshine
8h
Daily avg
Humidity
73%
moderate
UV Index
7
High
Wind
9 km/h
Gusts 22
Sea Temp
18°C
swimming
Crowds
Very busy
At attractions
September Sunrise & Sunset
Air Quality
PM2.5
13 μg/m³
PM10
23 μg/m³
Status
good
Feels-Like Temperature & Wind
Feels like
Daytime
24°C
Nighttime
14°C
Humidity and wind affect how the actual temperature feels.
Wind
9 km/h
Max gust 22 km/h
Activities Recommended for September
September Travel Pros & Cons
Pros
- Douro grape harvest magical
- 24°C ideal
- Post-summer reduced crowds
- Cellars + foot-treading
Cons
- September quinta visits book ahead 1-2 months
September Events & Festivals
- Douro Grape Harvest Sept 15-Oct 15
Porto in September — Full Picture
BEST MONTH — Douro grape harvest active + ideal weather + post-summer crowds. Magical for cellars + Douro Valley.
What to Wear & What to Pack
Pleasant. T-shirt + light jacket evening.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
18.3°C
9.3°C
10.3/mo
Summer (Jun·Jul·Aug)
24.7°C
14.3°C
4/mo
Autumn (Sep·Oct·Nov)
Current20.7°C
11.7°C
9.7/mo
Winter (Dec·Jan·Feb)
14.3°C
6.3°C
12.7/mo
Porto Monthly Weather Comparison
| Month | High | Low | Rain | Sun | Humid | UV | Crowd | Price |
|---|---|---|---|---|---|---|---|---|
| 14° | 6° | 13d·150mm | 4h | 80% | 2 | Quiet | Low season | |
| 15° | 6° | 12d·110mm | 5h | 78% | 3 | Quiet | Low season | |
| 17° | 8° | 11d·90mm | 6h | 75% | 5 | Moderate | Shoulder | |
| April (Best) | 18° | 9° | 11d·90mm | 7h | 73% | 6 | Busy | Peak |
| May (Best) | 20° | 11° | 9d·80mm | 8h | 70% | 7 | Busy | Peak |
| June (Best) | 23° | 13° | 6d·40mm | 9h | 70% | 8 | Very busy | Peak |
| July (Best) | 25° | 15° | 3d·20mm | 10h | 70% | 9 | Very busy | Peak |
| August (Best) | 26° | 15° | 3d·25mm | 9h | 70% | 9 | Very busy | Peak |
| September (Best) | 24° | 14° | 6d·60mm | 8h | 73% | 7 | Very busy | Peak |
| 21° | 12° | 11d·100mm | 6h | 78% | 5 | Moderate | Shoulder | |
| 17° | 9° | 12d·130mm | 4h | 80% | 3 | Quiet | Low season | |
| 14° | 7° | 13d·150mm | 4h | 80% | 2 | Moderate | Shoulder |
View Other Months
Porto September Hotel Picks
Frequently Asked Questions
Is September a good time to visit Porto?
Porto in September is very-high. Tourist crowds are very busy and flight/hotel prices are peak.
What's the average temperature in Porto in September?
Porto September averages a high of 24°C and a low of 14°C.
Does it rain much in Porto in September?
Porto September averages 60mm of rainfall over about 6 rainy days.
What should I wear in Porto in September?
Pleasant. T-shirt + light jacket evening.
What time are sunrise and sunset in Porto in September?
Porto September sunrise is 07:25 and sunset is 19:35, with 12h 10min of daylight.
What's the air quality like in Porto in September?
Porto September air quality (AQI) averages 38, rated Good. PM2.5 averages 13μg/m³.
What activities are recommended in Porto in September?
In September, Porto is great for Douro grape harvest (foot-treading), Cellars, Ribeira.
Is September peak season in Porto?
Porto September crowds are very busy and prices are peak. Advance reservations are strongly recommended.
Best Months to Visit Porto
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.