Early September 1 September
72°F
Typical afternoon high
38% historical wet-day frequency
Switzerland · Mountains
Eastern Switzerland & Graubünden
in September.
Is September a good time?
Mild days.
Fewer overnight stays than August.
September averages 68°F afternoons, with about 10 rain days. Later September is typically cooler.
- Afternoons
- 68°F
- Rain days
- 10
- Visitor demand
- 56%of February peak
Historical Ostschweiz regional averages, not a forecast or a measure of queues. Overnight demand compares average stays per day. Covers St. Moritz, Davos and St. Gallen; conditions vary within the region.
Overall match
6.3/10 · scores & prioritiesThis weather score measures sightseeing comfort. Snow and ski conditions need a separate check.
What matters most?
Weather 50% · Crowds 30% · Cost 20%
#4 of 12 months here · Balanced mix
Weather7.8/10Very good
CrowdsModerate 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 68°F (20°C): light layers; nights around 49°F (9°C): a sweater and a light jacket. Bring rain gear: about 10 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 06:58 and sets about 19:37 (local time, mid-month). Mornings start around 49°F (9°C); afternoons reach about 68°F (20°C). Expect rain on about 10 days in a typical September.
Typical afternoon
68°F (20°C)
average daily high, 15 recent Septembers
Night low
49°F (9°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 72°F on the 1st, versus 64°F on the 30th.
Mid September 15 September
69°F
Typical afternoon high
37% historical wet-day frequency
Late September 30 September
64°F
Typical afternoon high
38% 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 |
|---|---|---|---|---|---|---|
| 172° | 272° | 372° | 471° | 571° | ||
| 671° | 771° | 871° | 970° | 1070° | 1170° | 1269° |
| 1369° | 1469° | 1569° | 1668° | 1768° | 1867° | 1967° |
| 2067° | 2167° | 2266° | 2366° | 2466° | 2565° | 2665° |
| 2765° | 2865° | 2964° | 3064° |
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 71°F (22°C) in the first week to 65°F (18°C) in the last. The chance of a wet day runs 35–39%.
Crowds and cost
Visitor season
Will it be busy?
Moderate season. September averages 56% of February's overnight stays per day. Fewer overnight stays than August.
Overnight stays across Ostschweiz 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.
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 63°F (17°C) and 74°F (24°C); in 10 of them they were within 3°F (1.5°C) of the typical 68°F (20°C). Rain days ranged from 6 to 17; half the years had 8–14.
Rain days in each September
Rain days
10
at least 1 mm, typical year; about 15 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
20 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 | 71°F | 8 |
| 2012 | 67°F | 11 |
| 2013 | 67°F | 14 |
| 2014 | 68°F | 10 |
| 2015 | 64°F | 10 |
| 2016 | 71°F | 7 |
| 2017 | 63°F | 14 |
| 2018 | 71°F | 9 |
| 2019 | 67°F | 11 |
| 2020 | 69°F | 9 |
| 2021 | 70°F | 7 |
| 2022 | 66°F | 14 |
| 2023 | 74°F | 6 |
| 2024 | 66°F | 15 |
| 2025 | 67°F | 17 |
Checked against 25 local weather stations. How we check
Compare dates
August, September
or October?
| Typical conditions | Aug | Sep | Oct |
|---|---|---|---|
| Afternoons | 76°F | 68°F | 60°F |
| Rain days | 12 | 10 | 10 |
| Overnight demand | 86% | 56% | 43% |
August: Warmer afternoons and more rain days 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 86% 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 | 68°F | 76°F |
| Nights | 49°F | 55°F |
| Rain days | 10 | 12 |
| Visitor season | Moderate season | Peak season |
| Overall / 10 | 6.3 | 5.7 |
| Month rank | #4 | #8 |
Every month, in detail Show detailsHide details
| Month | Overall | Rank | High | Low | Rain days | Weather | Visitor season |
|---|---|---|---|---|---|---|---|
| January | 3.9 | #11 | 40°F | 26°F | 12 | 3.9 | Busy season |
| February | 3.7 | #12 | 44°F | 27°F | 8 | 4.6 | Peak season |
| March | 5.0 | #9 | 52°F | 32°F | 10 | 5.7 | Busy season |
| April | 6.4 | #3 | 59°F | 38°F | 10 | 6.5 | Low season |
| May | 6.5 | #1 | 65°F | 46°F | 14 | 6.8 | Low season |
| June | 6.4 | #2 | 74°F | 54°F | 13 | 7.8 | Moderate season |
| July | 5.8 | #7 | 76°F | 56°F | 14 | 8.1 | Busy season |
| August | 5.7 | #8 | 76°F | 55°F | 12 | 8.0 | Peak season |
| September | 6.3 | #4 | 68°F | 49°F | 10 | 7.8 | Moderate season |
| October | 6.0 | #5 | 60°F | 42°F | 10 | 6.5 | Moderate season |
| November | 5.9 | #6 | 49°F | 34°F | 10 | 4.9 | Low season |
| December | 4.6 | #10 | 42°F | 28°F | 14 | 4.2 | 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.
Liechtensteinabout 20 miles
Balanced Overall 7.3 · Very good weather, 70°F (21°C) · Busy season · Cost no data
VorarlbergAustria · about 30 miles
Balanced Overall 7.3 · Very good weather, 69°F (21°C) · Moderate season · Cost pricey
Milan, Lake Como & LombardyItaly · about 90 miles
Balanced Overall 7.2 · Excellent weather, 76°F (25°C) · Busy season · Cost pricey
Munich & Upper BavariaGermany · about 140 miles
Balanced Overall 6.8 · Very good weather, 69°F (20°C) · Busy season · Cost pricey
Venice & the VenetoItaly · about 140 miles
Balanced Overall 7.2 · Very good weather, 77°F (25°C) · Busy season · Cost pricey
Elsewhere in Europe
Better September weather than Eastern Switzerland & Graubünden
Eastern Switzerland & Graubünden's weather ranks 22 of 28 mountain regions this month. These mountain regions outside Switzerland have clearly better weather on your dates, nearest first, each compared with Eastern Switzerland & Graubünden.
TrentinoItaly · about 100 miles
Excellent weather (9.0): 5°F warmer afternoons, 4 fewer rain days, cheaper
Aosta ValleyItaly · about 130 miles
Excellent weather (9.0): 4°F warmer afternoons, 6 fewer rain days, quieter for its season (low season), cheaper
La RiojaSpain · about 670 miles
Excellent weather (9.2): 11°F warmer afternoons, 6 fewer rain days, cheaper
Brașov, Sibiu & central TransylvaniaRomania · about 730 miles
Excellent weather (9.2): 4°F warmer afternoons, 5 fewer rain days, busier for its season (busy season), cheaper
Western MacedoniaGreece · about 750 miles
Excellent weather (9.6): 11°F warmer afternoons, 6 fewer rain days, cheaper
How we knowSources, regional scope & scoring method Show detailsHide details
It's moderate season, 56% of the busiest month and about average for the year. That means about 33,000 overnight visitors on a typical September night across the region, 70% of them from Switzerland itself. Rentals booked through Airbnb, Booking, Expedia and Tripadvisor add up to 3,000 more: 9 for every 100 counted above. Some are the same properties counted twice.
| Climate suitability (HCI:Urban, 0–100) | 74 |
| How our weather was checked | 25 open weather stations in this region, January and July: afternoon highs typically within 2°F (0.9°C), night lows within 1°F (0.6°C). |
| Tourist nights per 1,000 residents per day | 26 |
| Busiest month here | February · 47 |
| Visitors as share of people present | 2.6% |
| Rank among Europe's regions this month | 74th percentile |
| Domestic share of nights | 70% |
| Platform rental nights per 100 counted nights | 9 |
| Visitor share if every platform night were extra | 2.8% |
| National hotel-price season | Switzerland historical 2024–2025 index: About usual (+2% vs its average month). Not a local room quote. |
| Population used | 1.3 million |
| Statistical region | CH05 · Ostschweiz |
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.