Portugal Porto Weather in September — Climate Guide
September in Porto is very-high
Porto Weather in September — Quick Answer
As of 2026- Avg temp
- 24° / 14°
- Rainfall
- 60mm · 6 days
- Crowds
- Very busy
As of 2026, Porto in September averages a high of 24°C and low of 14°C with 60mm of rain over about 6 days. Pleasant. T-shirt + light jacket evening.
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
Planning a September trip to Porto?
You've checked the weather — next come the budget and the route.
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.