TripPick Portugal Portugal

Porto Weather in September — Climate Guide

September in Porto is very-high

Avg High
24°C
Avg Low
14°C
Rainy Days
6
Sunshine
8h

September is very-high for Porto.

BEST MONTH — Douro grape harvest active + ideal weather + post-summer crowds. Magical for cellars + Douro Valley.

Crowds: Very busy Prices: Peak Sea temp: 18°C
10 /10

Travel score

Porto September Weather Stats

Avg High

24°C

-10°
40°
Temperature range

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

Sunrise
07:25
Day length
12h 10min
Sunset
19:35
00:0006:0012:0018:0024:00

Air Quality

38
AQI
Good
GoodModeratePoorVery poor

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

Douro grape harvest (foot-treading) Cellars Ribeira Foz beach (last warm) Aveiro

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

T-shirt + light jacket
Sweater evening
Sneakers
Sunglasses

Seasonal Weather Overview

Spring (Mar·Apr·May)

Avg High

18.3°C

Avg Low

9.3°C

Rainy days

10.3/mo

Busy Peak

Summer (Jun·Jul·Aug)

Avg High

24.7°C

Avg Low

14.3°C

Rainy days

4/mo

Very busy Peak

Autumn (Sep·Oct·Nov)

Current
Avg High

20.7°C

Avg Low

11.7°C

Rainy days

9.7/mo

Moderate Shoulder

Winter (Dec·Jan·Feb)

Avg High

14.3°C

Avg Low

6.3°C

Rainy days

12.7/mo

Quiet Low season

Porto Monthly Weather Comparison

Month High Low Rain Sun Humid UV Crowd Price
14° 13d·150mm 4h 80% 2 Quiet Low season
15° 12d·110mm 5h 78% 3 Quiet Low season
17° 11d·90mm 6h 75% 5 Moderate Shoulder
April (Best)
18° 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
24° 14° 6d·60mm 8h 73% 7 Very busy Peak
21° 12° 11d·100mm 6h 78% 5 Moderate Shoulder
17° 12d·130mm 4h 80% 3 Quiet Low season
14° 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

Jimmy Kong TripPick founder · Travel content creator

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.

8+ years analyzing travel data 30+ countries visited Live exchange rate verified
📅 Published: 🔄 Last updated: