Early September 1 September
75°F
Typical afternoon high
36% historical wet-day frequency
Switzerland · Countryside
Basel & northwest Switzerland
in September.
Is September a good time?
Warm days.
A steady visitor season.
September averages 71°F afternoons, with about 11 rain days. Later September is typically cooler.
- Afternoons
- 71°F
- Rain days
- 11
- Visitor demand
- 93%of June peak
Historical Nordwestschweiz regional averages, not a forecast or a measure of queues. Overnight demand compares average stays per day. Covers Basel; conditions vary within the region.
Overall match
6.5/10 · scores & prioritiesWhat matters most?
Weather 50% · Crowds 30% · Cost 20%
#1 of 12 months here · Balanced mix
Weather8.4/10Very good
CrowdsSteady all yearsimilar all year; overnight stays do not measure queuesFor its size, quieter than most of Europe this month
CostExpensivefor Europe; Switzerland-wide price level
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 71°F (22°C): T-shirt weather; nights around 51°F (10°C): a sweater and a light jacket. Bring rain gear: about 11 days with at least 1 mm of rain. About 13 hours of daylight.
A typical day: temperatures & daylightAfternoons, nights & daylight Show detailsHide details
About 13 hours of daylight.
The sun rises about 07:04 and sets about 19:43 (local time, mid-month). Mornings start around 51°F (10°C); afternoons reach about 71°F (22°C). Expect rain on about 11 days in a typical September.
Typical afternoon
71°F (22°C)
average daily high, 15 recent Septembers
Night low
51°F (10°C)
average daily minimum
Daylight
12h 39m
on the 15th, computed from latitude
Early, middle or late?
Early or late September?
Early September is typically warmer. The afternoon high averages 75°F on the 1st, versus 66°F on the 30th. Historical wet-day frequency rises from 36% to 41% between those dates.
Mid September 15 September
71°F
Typical afternoon high
38% historical wet-day frequency
Late September 30 September
66°F
Typical afternoon high
41% 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 |
|---|---|---|---|---|---|---|
| 175° | 275° | 375° | 474° | 574° | ||
| 674° | 774° | 873° | 973° | 1073° | 1173° | 1272° |
| 1372° | 1472° | 1571° | 1671° | 1770° | 1870° | 1970° |
| 2069° | 2169° | 2269° | 2368° | 2468° | 2568° | 2667° |
| 2767° | 2867° | 2967° | 3066° |
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 74°F (24°C) in the first week to 67°F (20°C) in the last. The chance of a wet day runs 35–41%.
Crowds and cost
Visitor season
Will it be busy?
Steady all year. September averages 93% of June's overnight stays per day. Overnight demand varies little across the year.
Overnight stays across Nordwestschweiz do not measure queues, day visitors or congestion at individual sights. For its size, quieter than most of Europe this month.
Hotel price season
Will it be cheaper?
About usual. Estimated from national hotel prices and local visitor demand; no measured regional room rate is available.
Fewer overnight stays do not automatically mean cheaper rooms. Check actual quotes for your trip.
Switzerland as a whole
Well above EU average
2024 restaurants and hotels price level: 171 where the EU average is 100. A relative index, not a room rate.
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 66°F (19°C) and 78°F (26°C); in 9 of them they were within 3°F (1.5°C) of the typical 71°F (22°C). Rain days ranged from 5 to 17; half the years had 8–15.
Rain days in each September
Rain days
11
at least 1 mm, typical year; about 16 in a wet year
Mostly sunny days
6 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
22 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 | 74°F | 11 |
| 2012 | 69°F | 11 |
| 2013 | 69°F | 15 |
| 2014 | 71°F | 11 |
| 2015 | 67°F | 11 |
| 2016 | 74°F | 8 |
| 2017 | 66°F | 12 |
| 2018 | 75°F | 7 |
| 2019 | 71°F | 10 |
| 2020 | 73°F | 9 |
| 2021 | 72°F | 6 |
| 2022 | 69°F | 17 |
| 2023 | 78°F | 5 |
| 2024 | 68°F | 15 |
| 2025 | 69°F | 17 |
Checked against 7 local weather stations. How we check
Compare dates
August, September
or October?
| Typical conditions | Aug | Sep | Oct |
|---|---|---|---|
| Afternoons | 79°F | 71°F | 62°F |
| Rain days | 11 | 11 | 11 |
| Overnight demand | 97% | 93% | 86% |
August: Warmer afternoons than September. August guide →
October: Cooler afternoons than September. October guide →
Overnight demand measures accommodation stays, not queues.
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.
Hotel stays vary little through the year. No other scored month has a Weather score at least 1.0 point higher than September.
Your comparison
September or August?
Overnight stays vary little through the year.
National hotel prices and local visitor demand suggest about usual. No measured regional room rate is available.
Read the August guide →| Typical conditions | September | August |
|---|---|---|
| Afternoons | 71°F | 79°F |
| Nights | 51°F | 57°F |
| Rain days | 11 | 11 |
| Visitor season | Steady all year | Steady all year |
| Overall / 10 | 6.5 | 6.4 |
| Month rank | #1 | #3 |
Every month, in detail Show detailsHide details
| Month | Overall | Rank | High | Low | Rain days | Weather | Visitor season |
|---|---|---|---|---|---|---|---|
| January | 4.3 | #12 | 43°F | 30°F | 15 | 4.0 | Steady all year |
| February | 4.9 | #9 | 47°F | 30°F | 9 | 5.0 | Steady all year |
| March | 5.4 | #8 | 55°F | 35°F | 11 | 6.1 | Steady all year |
| April | 5.9 | #6 | 62°F | 41°F | 10 | 7.1 | Steady all year |
| May | 6.0 | #5 | 68°F | 48°F | 15 | 7.4 | Steady all year |
| June | 6.3 | #4 | 77°F | 56°F | 13 | 8.0 | Steady all year |
| July | 6.4 | #2 | 79°F | 58°F | 13 | 8.0 | Steady all year |
| August | 6.4 | #3 | 79°F | 57°F | 11 | 7.9 | Steady all year |
| September | 6.5 | #1 | 71°F | 51°F | 11 | 8.4 | Steady all year |
| October | 5.8 | #7 | 62°F | 44°F | 11 | 7.0 | Steady all year |
| November | 4.8 | #10 | 51°F | 36°F | 12 | 5.0 | Steady all year |
| December | 4.4 | #11 | 45°F | 32°F | 16 | 4.2 | Steady all year |
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.
ZurichSwitzerland · about 30 miles
Balanced Overall 6.5 · Very good weather, 70°F (21°C) · Steady all year · Cost expensive
Lucerne & central Switzerlandabout 40 miles
Balanced Overall 6.0 · Very good weather, 69°F (21°C) · Busy season · Cost expensive
Milan, Lake Como & LombardyItaly · about 150 miles
Balanced Overall 7.2 · Excellent weather, 76°F (25°C) · Busy season · Cost pricey
TyrolInnsbruck · Austria · about 160 miles
Balanced Overall 7.1 · Very good weather, 68°F (20°C) · Moderate season · Cost pricey
Munich & Upper BavariaGermany · about 180 miles
Balanced Overall 6.8 · Very good weather, 69°F (20°C) · Busy season · Cost pricey
Elsewhere in Europe
Better September weather than Basel & northwest Switzerland
Basel & northwest Switzerland's weather ranks 101 of 117 countryside regions this month. These countryside regions outside Switzerland have clearly better weather on your dates, nearest first, each compared with Basel & northwest Switzerland.
PiedmontItaly · about 160 miles
Excellent weather (9.4): 5°F warmer afternoons, 4 fewer rain days, cheaper
Castile and LeónSpain · about 740 miles
Excellent weather (9.8): 7°F warmer afternoons, 6 fewer rain days, cheaper
OlteniaRomania · about 770 miles
Excellent weather (9.4): 7°F warmer afternoons, 7 fewer rain days, cheaper
Southern MunteniaRomania · about 880 miles
Excellent weather (9.6): 6°F warmer afternoons, 7 fewer rain days, cheaper
Veliko Tarnovo & north-central Bulgariaabout 910 miles
Excellent weather (9.4): 8°F warmer afternoons, 7 fewer rain days, cheaper
How we knowSources, regional scope & scoring method Show detailsHide details
Hotel stays are steady all year here: this month is 93% of the busiest and 13% above average. That counts overnight stays, not how busy the sights are. That means about 9,400 overnight visitors on a typical September night across the region, 47% of them from Switzerland itself. Rentals booked through Airbnb, Booking, Expedia and Tripadvisor add up to 1,000 more: 11 for every 100 counted above. Some are the same properties counted twice.
| Climate suitability (HCI:Urban, 0–100) | 77 |
| How our weather was checked | 7 open weather stations in this region, January and July: afternoon highs typically within 2°F (0.9°C), night lows within 1°F (0.3°C). |
| Tourist nights per 1,000 residents per day | 8 |
| Busiest month here | June · 8 |
| Visitors as share of people present | 0.8% |
| Rank among Europe's regions this month | 20th percentile |
| Domestic share of nights | 47% |
| Platform rental nights per 100 counted nights | 11 |
| Visitor share if every platform night were extra | 0.8% |
| National hotel-price season | Switzerland historical 2024–2025 index: About usual (+2% vs its average month). Not a local room quote. |
| Population used | 1.2 million |
| Statistical region | CH03 · Nordwestschweiz |
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. Full method · this region's data.