Early September 1 September
78°F
Typical afternoon high
28% historical wet-day frequency
Spain · City
Basque Country
in September.
Is September a good time?
Warm days.
Fewer overnight stays than August.
September averages 76°F afternoons and 70°F seas, with about 8 rain days. Later September is typically cooler.
- Afternoons
- 76°F
- Sea
- 70°F
- Visitor demand
- 73%of August peak
Historical País Vasco regional averages, not a forecast or a measure of queues. Overnight demand compares average stays per day. Covers San Sebastián and Bilbao; conditions vary within the region.
Overall match
7.5/10 · scores & prioritiesWhat matters most?
Weather 50% · Crowds 30% · Cost 20%
#2 of 12 months here · Balanced mix
Weather8.9/10Very good
CrowdsBusy seasonvs its own year; overnight stays do not measure queues
CostPriceyfor 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 76°F (24°C): T-shirt weather; nights around 57°F (14°C): a sweater and a light jacket. Bring rain gear: about 8 days with at least 1 mm of rain. About 13 hours of daylight.
Can I swim in September?
The sea averages 70°F. Our swimming guide: comfortable for a swim. 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 07:49 and sets about 20:23 (local time, mid-month). Mornings start around 57°F (14°C); afternoons reach about 76°F (24°C). Expect rain on about 8 days in a typical September.
Typical afternoon
76°F (24°C)
average daily high, 15 recent Septembers
Night low
57°F (14°C)
average daily minimum
Sea
70°F (21°C)
comfortable; open water near the coast, NOAA satellite record 2011–2025
Daylight
12h 34m
on the 15th, computed from latitude
Early, middle or late?
Early or late September?
Early September is typically warmer. The afternoon high averages 78°F on the 1st, versus 73°F on the 30th. Historical wet-day frequency falls from 28% to 25% between those dates.
Mid September 15 September
76°F
Typical afternoon high
30% historical wet-day frequency
Late September 30 September
73°F
Typical afternoon high
25% 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 |
|---|---|---|---|---|---|---|
| 178° | 278° | 377° | 477° | 577° | ||
| 677° | 777° | 877° | 977° | 1077° | 1177° | 1276° |
| 1376° | 1476° | 1576° | 1676° | 1775° | 1875° | 1975° |
| 2075° | 2175° | 2274° | 2374° | 2474° | 2574° | 2674° |
| 2774° | 2873° | 2973° | 3073° |
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 77°F (25°C) in the first week to 74°F (23°C) in the last. The chance of a wet day runs 25–30%.
Crowds and cost
Visitor season
Will it be busy?
Busy season. September averages 73% of August's overnight stays per day. Fewer overnight stays than August.
Overnight stays across País Vasco do not measure queues, day visitors or congestion at individual sights.
Hotel price season
Will it be cheaper?
Well above usual. Historical regional hotel revenue (2024–2025 monthly average): €139 per occupied room-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
€139
2024–2025 monthly average; hotel revenue per occupied room-night; not a current booking quote. +23% vs this region's usual month.
Spain as a whole
Below EU average
2024 restaurants and hotels price level: 84 where the EU average is 100. A relative index, not a room rate.
The historical regional amount comes from INE Spain, EOH/IRSH table 2059: hotel average daily rate per occupied room; 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 71°F (22°C) and 80°F (27°C); in 11 of them they were within 3°F (1.5°C) of the typical 76°F (24°C). Rain days ranged from 4 to 14; half the years had 6–10.
Rain days in each September
Rain days
8
at least 1 mm, typical year; about 12 in a wet year
Mostly sunny days
4 of 30
cloud cover under 30%
Years with a 95°F+ day
0 of 15
no September in the last 15 years had a day at or above 95°F (35°C)
Good weather days
25 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 | 78°F | 5 |
| 2012 | 75°F | 8 |
| 2013 | 76°F | 10 |
| 2014 | 78°F | 5 |
| 2015 | 71°F | 9 |
| 2016 | 77°F | 8 |
| 2017 | 72°F | 12 |
| 2018 | 78°F | 4 |
| 2019 | 75°F | 6 |
| 2020 | 76°F | 6 |
| 2021 | 76°F | 12 |
| 2022 | 76°F | 7 |
| 2023 | 80°F | 10 |
| 2024 | 71°F | 14 |
| 2025 | 75°F | 9 |
Checked against 31 local weather stations. How we check
Compare dates
August, September
or October?
| Typical conditions | Aug | Sep | Oct |
|---|---|---|---|
| Afternoons | 80°F | 76°F | 70°F |
| Sea | 72°F | 70°F | 66°F |
| Rain days | 6 | 8 | 7 |
| Overnight demand | 100% | 73% | 62% |
August: Warmer afternoons, warmer sea and fewer rain days than September. More overnight demand. August guide →
October: Cooler afternoons and cooler sea 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): €152 per occupied room-night. An average, not a booking quote.
Read the August guide →| Typical conditions | September | August |
|---|---|---|
| Afternoons | 76°F | 80°F |
| Nights | 57°F | 60°F |
| Sea | 70°F | 72°F |
| Rain days | 8 | 6 |
| Visitor season | Busy season | Peak season |
| Overall / 10 | 7.5 | 6.6 |
| Month rank | #2 | #9 |
Every month, in detail Show detailsHide details
| Month | Overall | Rank | High | Low | Sea | Rain days | Weather | Visitor season |
|---|---|---|---|---|---|---|---|---|
| January | 6.0 | #12 | 54°F | 41°F | 56°F | 14 | 5.0 | Low season |
| February | 6.4 | #11 | 56°F | 42°F | 55°F | 12 | 5.4 | Moderate season |
| March | 7.2 | #6 | 60°F | 44°F | 55°F | 13 | 6.4 | Moderate season |
| April | 7.3 | #5 | 64°F | 47°F | 57°F | 11 | 7.3 | Moderate season |
| May | 7.4 | #4 | 69°F | 51°F | 61°F | 11 | 8.1 | Busy season |
| June | 7.5 | #3 | 75°F | 56°F | 66°F | 8 | 8.6 | Busy season |
| July | 7.1 | #7 | 78°F | 59°F | 71°F | 5 | 9.0 | Peak season |
| August | 6.6 | #9 | 80°F | 60°F | 72°F | 6 | 8.8 | Peak season |
| September | 7.5 | #2 | 76°F | 57°F | 70°F | 8 | 8.9 | Busy season |
| October | 7.8 | #1 | 70°F | 54°F | 66°F | 7 | 8.7 | Busy season |
| November | 7.0 | #8 | 60°F | 48°F | 62°F | 15 | 6.0 | Moderate season |
| December | 6.6 | #10 | 57°F | 44°F | 58°F | 12 | 5.6 | 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.
La RiojaSpain · about 50 miles
Balanced Overall 8.2 · Excellent weather, 79°F (26°C) · Busy season · Cost moderate
NavarreSpain · about 60 miles
Balanced Overall 8.2 · Excellent weather, 78°F (25°C) · Busy season · Cost cheap
Castile and LeónSpain · about 140 miles
Balanced Overall 8.5 · Excellent weather, 78°F (25°C) · Busy season · Cost cheap
Bordeaux & the Atlantic coastAquitaine · France · about 150 miles
Balanced Overall 7.7 · Very good weather, 78°F (25°C) · Low season · Cost pricey
MadridSpain · about 190 miles
Balanced Overall 7.9 · Excellent weather, 83°F (28°C) · Steady all year · Cost pricey
Elsewhere in Europe
Better September weather than Basque Country
Basque Country's weather ranks 13 of 41 city regions this month. These city regions outside Spain have clearly better weather on your dates, nearest first, each compared with Basque Country.
How we knowSources, regional scope & scoring method Show detailsHide details
It's busy season, 73% of the busiest month and 22% above its average month.The figures cover the whole País Vasco region, suburbs included. That means about 35,000 overnight visitors on a typical September night across the region, 46% of them from Spain itself. Rentals booked through Airbnb, Booking, Expedia and Tripadvisor add up to 9,900 more: 29 for every 100 counted above. Some are the same properties counted twice.
| Climate suitability (HCI:Urban, 0–100) | 79 |
| How our weather was checked | 31 open weather stations in this region, January and July: afternoon highs typically within 1°F (0.1°C), night lows within 1°F (0.4°C). |
| Tourist nights per 1,000 residents per day | 16 |
| Busiest month here | August · 21 |
| Visitors as share of people present | 1.5% |
| Rank among Europe's regions this month | 50th percentile |
| Domestic share of nights | 46% |
| Platform rental nights per 100 counted nights | 29 |
| Visitor share if every platform night were extra | 2.0% |
| Population used | 2.2 million |
| Statistical region | ES21 · País Vasco |
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 Spain, EOH/IRSH table 2059: hotel average daily rate per occupied room). Full method · this region's data.