Early September 1 September
75°F
Typical afternoon high
29% historical wet-day frequency
Switzerland · Mountains
Lake Geneva & Valais
in September.
Is September a good time?
Warm days.
Fewer overnight stays than August.
September averages 71°F afternoons, with about 9 rain days. Later September is typically cooler.
- Afternoons
- 71°F
- Rain days
- 9
- Visitor demand
- 68%of August peak
Historical Région lémanique regional averages, not a forecast or a measure of queues. Overnight demand compares average stays per day. Covers Geneva, Lausanne, Montreux, Zermatt and Verbier; conditions vary within the region.
Overall match
6.4/10 · scores & prioritiesThis weather score measures sightseeing comfort. Snow and ski conditions need a separate check.
What matters most?
Weather 50% · Crowds 30% · Cost 20%
#1 of 12 months here · Balanced mix
Weather8.3/10Very good
CrowdsBusy seasonvs its own year; overnight stays do not measure queuesFor its size, typical for 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 (11°C): a sweater and a light jacket. Bring rain gear: about 9 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 07:08 and sets about 19:45 (local time, mid-month). Mornings start around 51°F (11°C); afternoons reach about 71°F (22°C). Expect rain on about 9 days in a typical September.
Typical afternoon
71°F (22°C)
average daily high, 15 recent Septembers
Night low
51°F (11°C)
average daily minimum
Daylight
12h 38m
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 29% to 34% between those dates.
Mid September 15 September
71°F
Typical afternoon high
33% historical wet-day frequency
Late September 30 September
66°F
Typical afternoon high
34% 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° | 374° | 474° | 574° | ||
| 673° | 773° | 873° | 973° | 1073° | 1172° | 1272° |
| 1371° | 1471° | 1571° | 1671° | 1770° | 1870° | 1969° |
| 2069° | 2169° | 2269° | 2369° | 2468° | 2568° | 2668° |
| 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 (23°C) in the first week to 67°F (20°C) in the last. The chance of a wet day runs 29–35%.
Crowds, cost and getting there
Visitor season
Will it be busy?
Busy season. September averages 68% of August's overnight stays per day. Fewer overnight stays than August.
Overnight stays across Région lémanique 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?
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.
Recorded US nonstop flights · 2024
Recorded this month
from New York JFK, Washington Dulles and Newark; 2024 schedule, Eurostat
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 77°F (25°C); in 10 of them they were within 3°F (1.5°C) of the typical 71°F (22°C). Rain days ranged from 5 to 15; half the years had 7–11.
Rain days in each September
Rain days
9
at least 1 mm, typical year; about 14 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
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 | 73°F | 7 |
| 2012 | 69°F | 9 |
| 2013 | 70°F | 11 |
| 2014 | 70°F | 7 |
| 2015 | 67°F | 11 |
| 2016 | 73°F | 6 |
| 2017 | 66°F | 10 |
| 2018 | 75°F | 5 |
| 2019 | 71°F | 9 |
| 2020 | 72°F | 9 |
| 2021 | 72°F | 7 |
| 2022 | 69°F | 14 |
| 2023 | 77°F | 7 |
| 2024 | 67°F | 15 |
| 2025 | 69°F | 15 |
Checked against 23 local weather stations. How we check
Compare dates
August, September
or October?
| Typical conditions | Aug | Sep | Oct |
|---|---|---|---|
| Afternoons | 79°F | 71°F | 63°F |
| Rain days | 9 | 9 | 9 |
| Overnight demand | 100% | 68% | 49% |
August: Warmer afternoons than September. More overnight demand. August guide →
October: Cooler afternoons than September. Less overnight demand. 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.
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.
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 | 9 | 9 |
| Visitor season | Busy season | Peak season |
| Overall / 10 | 6.4 | 5.6 |
| Month rank | #1 | #8 |
Every month, in detail Show detailsHide details
| Month | Overall | Rank | High | Low | Rain days | Weather | Visitor season |
|---|---|---|---|---|---|---|---|
| January | 4.1 | #11 | 43°F | 28°F | 14 | 3.9 | Busy season |
| February | 3.8 | #12 | 47°F | 30°F | 8 | 4.8 | Peak season |
| March | 5.1 | #9 | 54°F | 35°F | 9 | 5.8 | Busy season |
| April | 6.2 | #5 | 61°F | 40°F | 9 | 6.8 | Moderate season |
| May | 6.4 | #3 | 66°F | 47°F | 12 | 7.1 | Moderate season |
| June | 6.4 | #2 | 75°F | 55°F | 11 | 8.2 | Busy season |
| July | 5.6 | #7 | 78°F | 58°F | 10 | 8.4 | Peak season |
| August | 5.6 | #8 | 79°F | 57°F | 9 | 8.4 | Peak season |
| September | 6.4 | #1 | 71°F | 51°F | 9 | 8.3 | Busy season |
| October | 6.4 | #4 | 63°F | 44°F | 9 | 7.0 | Moderate season |
| November | 5.9 | #6 | 51°F | 36°F | 11 | 5.0 | Moderate season |
| December | 4.4 | #10 | 44°F | 30°F | 14 | 4.0 | Busy 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.
Bern & the Bernese OberlandSwitzerland · about 40 miles
Balanced Overall 6.3 · Very good weather, 69°F (21°C) · Busy season · Cost expensive
Aosta ValleyItaly · about 40 miles
Balanced Overall 8.3 · Excellent weather, 72°F (22°C) · Low season · Cost moderate
Lyon & the French AlpsRhône-Alpes · France · about 110 miles
Balanced Overall 8.2 · Very good weather, 74°F (23°C) · Moderate season · Cost pricey
Milan, Lake Como & LombardyItaly · about 130 miles
Balanced Overall 7.2 · Excellent weather, 76°F (25°C) · Busy season · Cost pricey
French Riviera & ProvenceFrance · about 170 miles
Balanced Overall 7.9 · Excellent weather, 79°F (26°C) · Moderate season · Cost pricey
Elsewhere in Europe
Better September weather than Lake Geneva & Valais
Lake Geneva & Valais' weather ranks 16 of 28 mountain regions this month. These mountain regions outside Switzerland have clearly better weather on your dates, nearest first, each compared with Lake Geneva & Valais.
How we knowSources, regional scope & scoring method Show detailsHide details
It's busy season, 68% of the busiest month and about average for the year. That means about 44,000 overnight visitors on a typical September night across the region, 48% of them from Switzerland itself. Rentals booked through Airbnb, Booking, Expedia and Tripadvisor add up to 7,000 more: 16 for every 100 counted above. Some are the same properties counted twice.
| Climate suitability (HCI:Urban, 0–100) | 76 |
| How our weather was checked | 23 open weather stations in this region, January and July: afternoon highs typically within 1°F (0.7°C), night lows within 2°F (0.8°C). |
| Tourist nights per 1,000 residents per day | 25 |
| Busiest month here | August · 37 |
| Visitors as share of people present | 2.5% |
| Rank among Europe's regions this month | 73rd percentile |
| Domestic share of nights | 48% |
| Platform rental nights per 100 counted nights | 16 |
| Visitor share if every platform night were extra | 2.9% |
| National hotel-price season | Switzerland historical 2024–2025 index: About usual (+2% vs its average month). Not a local room quote. |
| Population used | 1.8 million |
| Statistical region | CH01 · Région lémanique |
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.