Early September 1 September
81°F
Typical afternoon high
14% historical wet-day frequency
Portugal · Beach
Porto & northern Portugal
in September.
Is September a good time?
Warm days.
Fewer overnight stays than August.
September averages 78°F afternoons and 63°F seas, with about 5 rain days. Later September is typically cooler.
- Afternoons
- 78°F
- Sea
- 63°F
- Visitor demand
- 77%of August peak
Historical Norte regional averages, not a forecast or a measure of queues. Overnight demand compares average stays per day. Covers Porto, Douro Valley and Braga; conditions vary within the region.
Overall match
7.8/10 · scores & prioritiesPlanning to sightsee in Porto? The weather score rates beach conditions. Sightseeing rates excellent (9.4/10).
What matters most?
Weather 50% · Crowds 30% · Cost 20%
#3 of 12 months here · Balanced mix
Weather9.1/10Excellent
CrowdsBusy seasonvs its own year; overnight stays do not measure queuesFor its size, typical for Europe this month
CostModeratefor Europe
Overall combines weather, overnight demand and cost. It does not include sea temperature.
Plan your September
What to expect.
What should I pack?
Afternoons around 78°F (26°C): T-shirt weather; nights around 57°F (14°C): a sweater and a light jacket. About 13 hours of daylight. About 5 rain days in a typical September.
Can I swim in September?
The sea averages 63°F. Our swimming guide: cold: short dips, or a wetsuit. Your comfort will vary. This is open water near the coast, not a beach-specific reading.
Monthly coastal averages from NOAA, 2011–2025. Sea temperature is separate from the weather and Overall scores.
A typical day: temperatures & daylightAfternoons, nights, sea temperature & daylight Show detailsHide details
About 13 hours of daylight.
The sun rises about 07:10 and sets about 19:42 (local time, mid-month). Mornings start around 57°F (14°C); afternoons reach about 78°F (26°C). Expect rain on about 5 days in a typical September.
Typical afternoon
78°F (26°C)
average daily high, 15 recent Septembers
Night low
57°F (14°C)
average daily minimum
Sea
63°F (17°C)
cold; open water near the coast, NOAA satellite record 2011–2025
Daylight
12h 33m
on the 15th, computed from latitude
Early, middle or late?
Early or late September?
Early September is typically warmer. The afternoon high averages 81°F on the 1st, versus 75°F on the 30th. Historical wet-day frequency rises from 14% to 20% between those dates.
Mid September 15 September
78°F
Typical afternoon high
20% historical wet-day frequency
Late September 30 September
75°F
Typical afternoon high
20% historical wet-day frequency
Historical daily averages from 2011–2025, smoothed over two weeks. A seasonal pattern, not a forecast. This does not establish which week has the lowest prices or fewest visitors.
Daily calendar & holiday datesSeptember 2027 · historical weather & dated holidays Show calendarHide calendar
September 2027 calendar
Weather shows historical patterns, not a forecast. Holidays and events use the dates shown for 2027.
| Mon | Tue | Wed | Thu | Fri | Sat | Sun |
|---|---|---|---|---|---|---|
| 181° | 281° | 380° | 480° | 580° | ||
| 680° | 780° | 880° | 980° | 1080° | 1179° | 1279° |
| 1379° | 1479° | 1578° | 1678° | 1778° | 1878° | 1977° |
| 2077° | 2177° | 2276° | 2376° | 2476° | 2576° | 2676° |
| 2776° | 2875° | 2975° | 3075° |
Afternoon high rain likely (25%+) local school holidays public holiday event
School-holiday dates for September 2027 aren't available in our data yet. A day without a school marker doesn't mean schools are open.
Afternoons cool from about 81°F (27°C) in the first week to 76°F (24°C) in the last. The chance of a wet day runs 14–23%.
Crowds, cost and getting there
Visitor season
Will it be busy?
Busy season. September averages 77% of August's overnight stays per day. Fewer overnight stays than August.
Overnight stays across Norte do not measure queues, day visitors or congestion at individual sights. For its size, typical for Europe this month.
Hotel price season
Will it be cheaper?
Well above usual. Historical regional hotel revenue (2024–2025 monthly average): €77 per guest-night. An average, not a booking quote.
Fewer overnight stays do not automatically mean cheaper rooms. Check actual quotes for your trip.
Historical hotel average
€77
2024–2025 monthly average; hotel revenue per guest-night; not a current booking quote. +25% vs this region's usual month.
Portugal as a whole
Well below EU average
2024 restaurants and hotels price level: 76 where the EU average is 100. A relative index, not a room rate.
Recorded US nonstop flights · 2024
Recorded this month
from Newark; 2024 schedule, Eurostat
The historical regional amount comes from INE Portugal, Inquérito à Permanência de Hóspedes: hotel room revenue per guest-night; the country price level is national. Hotel averages are not live booking quotes.
Year-to-year variation
How much does September vary?
Across the recorded years
In the 15 years from 2011 to 2025, the month's afternoons averaged between 76°F (24°C) and 83°F (28°C); in 13 of them they were within 3°F (1.5°C) of the typical 78°F (26°C). Rain days ranged from 1 to 13; half the years had 3–8.
Rain days in each September
Rain days
5
at least 1 mm, typical year; about 11 in a wet year
Mostly sunny days
11 of 30
cloud cover under 30%
Years with a 95°F+ day
1 of 15
of the last 15 Septembers had at least one day at or above 95°F (35°C)
Good weather days
24 of 30
rated very good or better
See every recorded SeptemberHistorical monthly averages, year by year Show detailsHide details
| Year | Afternoon high | Rain days |
|---|---|---|
| 2011 | 79°F | 3 |
| 2012 | 80°F | 4 |
| 2013 | 82°F | 5 |
| 2014 | 77°F | 13 |
| 2015 | 76°F | 4 |
| 2016 | 80°F | 4 |
| 2017 | 76°F | 1 |
| 2018 | 83°F | 2 |
| 2019 | 79°F | 3 |
| 2020 | 80°F | 6 |
| 2021 | 76°F | 10 |
| 2022 | 76°F | 8 |
| 2023 | 77°F | 11 |
| 2024 | 76°F | 5 |
| 2025 | 76°F | 6 |
Checked against official climate averages for Porto (Pedras Rubras). How we check
Compare dates
August, September
or October?
| Typical conditions | Aug | Sep | Oct |
|---|---|---|---|
| Afternoons | 83°F | 78°F | 71°F |
| Sea | 63°F | 63°F | 63°F |
| Rain days | 2 | 5 | 11 |
| Overnight demand | 100% | 77% | 64% |
August: Warmer afternoons and fewer rain days than September. More overnight demand. August guide →
October: Cooler afternoons and more rain days than September. Less overnight demand. October guide →
Overnight demand measures accommodation stays, not queues. Sea temperatures are monthly coastal averages.
Compare any of the 12 monthsChoose another month and compare it with September Show comparisonHide comparison
Yellow marks the top three months on the Balanced mix. September stays as your reference.
No other scored month has a Weather score at least 1.0 point higher than September.
Your comparison
September or August?
Overnight stays are 100% of the busiest month.
Historical regional hotel revenue (2024–2025 monthly average): €64 per guest-night. An average, not a booking quote.
Read the August guide →| Typical conditions | September | August |
|---|---|---|
| Afternoons | 78°F | 83°F |
| Nights | 57°F | 58°F |
| Sea | 63°F | 63°F |
| Rain days | 5 | 2 |
| Visitor season | Busy season | Peak season |
| Overall / 10 | 7.8 | 7.8 |
| Month rank | #3 | #2 |
Every month, in detail Show detailsHide details
| Month | Overall | Rank | High | Low | Sea | Rain days | Weather | Visitor season |
|---|---|---|---|---|---|---|---|---|
| January | 4.3 | #12 | 56°F | 42°F | 57°F | 11 | 2.3 | Low season |
| February | 5.1 | #10 | 58°F | 43°F | 56°F | 9 | 3.1 | Moderate season |
| March | 6.2 | #8 | 62°F | 45°F | 57°F | 10 | 4.2 | Moderate season |
| April | 6.5 | #7 | 67°F | 48°F | 59°F | 11 | 5.4 | Busy season |
| May | 7.2 | #5 | 72°F | 52°F | 60°F | 8 | 7.4 | Busy season |
| June | 7.7 | #4 | 77°F | 55°F | 62°F | 5 | 8.5 | Busy season |
| July | 8.3 | #1 | 83°F | 58°F | 63°F | 2 | 10.0 | Busy season |
| August | 7.8 | #2 | 83°F | 58°F | 63°F | 2 | 10.0 | Peak season |
| September | 7.8 | #3 | 78°F | 57°F | 63°F | 5 | 9.1 | Busy season |
| October | 6.8 | #6 | 71°F | 54°F | 63°F | 11 | 6.3 | Busy season |
| November | 5.7 | #9 | 61°F | 48°F | 61°F | 14 | 3.7 | Moderate season |
| December | 4.7 | #11 | 58°F | 44°F | 59°F | 13 | 2.7 | Moderate season |
Near here
Nearby places in September
Nearby regions, nearest first. Distances are centre to centre, as the crow flies; they are not road distances or journey times.
Central Portugalabout 80 miles
Balanced Overall 8.7 · Excellent weather, 80°F (27°C) · Moderate season · Cost cheap
GaliciaSpain · about 90 miles
Balanced Overall 7.7 · Very good weather, 75°F (24°C) · Moderate season · Cost cheap
Castile and LeónSpain · about 150 miles
Balanced Overall 8.5 · Excellent weather, 78°F (25°C) · Busy season · Cost cheap
AsturiasSpain · about 150 miles
Balanced Overall 7.6 · Very good weather, 74°F (23°C) · Moderate season · Cost cheap
Óbidos, Nazaré & the Tagus ValleyPortugal · about 160 miles
Balanced Overall 8.6 · Excellent weather, 82°F (28°C) · Busy season · Cost cheap
Elsewhere in Europe
As good as Porto & northern Portugal in September, but quieter
Porto & northern Portugal's weather ranks 37 of 77 beach regions this month. Porto & northern Portugal already has excellent weather in September; these beach regions outside Portugal are about as good and quieter for their season, nearest first.
Languedoc-RoussillonFrance · about 570 miles
Excellent weather (9.0): about as warm, quieter for its season (moderate season), pricier
French Riviera & ProvenceFrance · about 720 miles
Excellent weather (9.5): about as warm, quieter for its season (moderate season), pricier
CorsicaFrance · about 860 miles
Excellent weather (9.8): about as warm, quieter for its season (moderate season), pricier
MarcheItaly · about 1070 miles
Excellent weather (9.3): about as warm, 2 more rain days, quieter for its season (moderate season), pricier
AbruzzoItaly · about 1110 miles
Excellent weather (9.1): about as warm, quieter for its season (low season), pricier
How we knowSources, regional scope & scoring method Show detailsHide details
It's busy season, 77% of the busiest month and 27% above its average month. That means about 54,000 overnight visitors on a typical September night across the region, 34% of them from Portugal itself. Rentals booked through Airbnb, Booking, Expedia and Tripadvisor add up to 34,000 more: 63 for every 100 counted above. Some are the same properties counted twice.
| Climate suitability (HCI:Beach, 0–100) | 80 |
| How our weather was checked | Official climate averages for Porto (Pedras Rubras) from the national weather service, every month: afternoon highs typically within 3°F (1.5°C), night lows within 1°F (0.5°C). |
| Tourist nights per 1,000 residents per day | 15 |
| Busiest month here | August · 19 |
| Visitors as share of people present | 1.4% |
| Rank among Europe's regions this month | 45th percentile |
| Domestic share of nights | 34% |
| Platform rental nights per 100 counted nights | 63 |
| Visitor share if every platform night were extra | 2.3% |
| Population used | 3.7 million |
| Statistical region | PT11 · Norte |
Crowds: Eurostat nights spent at tourist accommodation, by month and NUTS 2 region, 2024–2025 average. Overnight visitors per night is the month's nights divided by its days; the per-1,000 figure is Eurostat's, against each year's population. Platform rentals: Eurostat nights booked via Airbnb, Booking, Expedia and Tripadvisor, 2024–2025 average, shown separately because some properties are in both counts. Weather: Holiday Climate Index computed from ERA5 reanalysis with daily highs, night lows and rain days corrected from open national weather-service station records, 2011–2025, population-weighted to the region; day-by-day figures are the same data averaged by date. Heat and rain odds are counted across those years. Sunrise and sunset: NOAA solar equations, local time. Prices: Eurostat price level index and HICP, national; the first figure is regional (INE Portugal, Inquérito à Permanência de Hóspedes: hotel room revenue per guest-night). Full method · this region's data.