Early September 1 September
76°F
Typical afternoon high
15% historical wet-day frequency
Italy · Mountains
Aosta Valley
in September.
Is September a good time?
Warm days.
Fewer overnight stays than August.
September averages 72°F afternoons, with about 5 rain days. Later September is typically cooler.
- Afternoons
- 72°F
- Rain days
- 5
- Visitor demand
- 29%of August peak
Historical Valle d’Aosta/Vallée d’Aoste regional averages, not a forecast or a measure of queues. Overnight demand compares average stays per day. Covers Courmayeur and Cervinia; conditions vary within the region.
Overall match
8.3/10 · scores & prioritiesThis weather score measures sightseeing comfort. Snow and ski conditions need a separate check.
What matters most?
Weather 50% · Crowds 30% · Cost 20%
#1 of 12 months here · Balanced mix
Weather9.0/10Excellent
CrowdsLow seasonvs its own year; overnight stays do not measure queuesFor its size, one of Europe's busiest this month
CostModeratefor Europe; Italy-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 72°F (22°C): T-shirt weather. About 13 hours of daylight. About 5 rain days in a typical September.
A typical day: temperatures & daylightAfternoons, nights & daylight Show detailsHide details
About 13 hours of daylight.
The sun rises about 07:07 and sets about 19:44 (local time, mid-month). Afternoons reach about 72°F (22°C). Expect rain on about 5 days in a typical September.
Typical afternoon
72°F (22°C)
average daily high, 15 recent Septembers
Night low
—
not shown here: our correction of the model data isn't accurate enough for night lows in this region
Daylight
12h 37m
on the 15th, computed from latitude
Early, middle or late?
Early or late September?
Early September is typically warmer. The afternoon high averages 76°F on the 1st, versus 67°F on the 30th.
Mid September 15 September
72°F
Typical afternoon high
14% historical wet-day frequency
Late September 30 September
67°F
Typical afternoon high
17% 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 |
|---|---|---|---|---|---|---|
| 176° | 276° | 375° | 475° | 575° | ||
| 674° | 774° | 874° | 974° | 1074° | 1173° | 1273° |
| 1373° | 1472° | 1572° | 1672° | 1771° | 1871° | 1971° |
| 2070° | 2170° | 2270° | 2369° | 2469° | 2569° | 2668° |
| 2768° | 2868° | 2967° | 3067° |
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 75°F (24°C) in the first week to 68°F (20°C) in the last. The chance of a wet day runs 13–17%.
Crowds and cost
Visitor season
Will it be busy?
Low season. September averages 29% of August's overnight stays per day. Fewer overnight stays than August.
Overnight stays across Valle d’Aosta/Vallée d’Aoste do not measure queues, day visitors or congestion at individual sights. For its size, one of Europe's busiest this month.
Hotel price season
Will it be cheaper?
About usual. The regional index has no room-rate baseline in euros.
Fewer overnight stays do not automatically mean cheaper rooms. Check actual quotes for your trip.
Italy as a whole
Above EU average
2024 restaurants and hotels price level: 107 where the EU average is 100. A relative index, not a room rate.
The hotel-season index is regional (ISTAT, NIC consumer price index for accommodation services (ECOICOP 112), by region); the country price level is national. Neither is a room quote.
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 67°F (20°C) and 77°F (25°C); in 9 of them they were within 3°F (1.5°C) of the typical 72°F (22°C). Rain days ranged from 1 to 9; half the years had 2–5.
Rain days in each September
Rain days
5
at least 1 mm, typical year; about 6 in a wet year
Mostly sunny days
3 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 | 75°F | 3 |
| 2012 | 71°F | 5 |
| 2013 | 72°F | 5 |
| 2014 | 70°F | 2 |
| 2015 | 68°F | 6 |
| 2016 | 74°F | 2 |
| 2017 | 67°F | 2 |
| 2018 | 75°F | 3 |
| 2019 | 73°F | 3 |
| 2020 | 72°F | 1 |
| 2021 | 73°F | 5 |
| 2022 | 70°F | 5 |
| 2023 | 77°F | 5 |
| 2024 | 67°F | 5 |
| 2025 | 71°F | 9 |
Checked against official climate averages for Aosta (Piazza Plouves). How we check
Compare dates
August, September
or October?
| Typical conditions | Aug | Sep | Oct |
|---|---|---|---|
| Afternoons | 80°F | 72°F | 62°F |
| Rain days | 4 | 5 | 6 |
| Overnight demand | 100% | 29% | 12% |
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.
Historical regional hotel-price season: well above usual. There is no room-rate baseline in euros.
Read the August guide →| Typical conditions | September | August |
|---|---|---|
| Afternoons | 72°F | 80°F |
| Nights | — | — |
| Rain days | 5 | 4 |
| Visitor season | Low season | Peak season |
| Overall / 10 | 8.3 | 6.6 |
| Month rank | #1 | #7 |
Every month, in detail Show detailsHide details
| Month | Overall | Rank | High | Low | Rain days | Weather | Visitor season |
|---|---|---|---|---|---|---|---|
| January | 5.3 | #12 | 38°F | — | 6 | 4.4 | Moderate season |
| February | 5.4 | #11 | 45°F | — | 5 | 5.1 | Busy season |
| March | 6.1 | #9 | 52°F | — | 6 | 5.6 | Moderate season |
| April | 7.2 | #6 | 59°F | — | 5 | 6.5 | Low season |
| May | 7.9 | #3 | 66°F | — | 6 | 7.3 | Low season |
| June | 8.2 | #2 | 76°F | — | 5 | 8.9 | Low season |
| July | 7.3 | #5 | 80°F | — | 4 | 9.3 | Busy season |
| August | 6.6 | #7 | 80°F | — | 4 | 9.2 | Peak season |
| September | 8.3 | #1 | 72°F | — | 5 | 9.0 | Low season |
| October | 7.4 | #4 | 62°F | — | 6 | 6.9 | Low season |
| November | 6.4 | #8 | 48°F | — | 7 | 4.8 | Low season |
| December | 5.6 | #10 | 39°F | — | 8 | 4.4 | 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.
Lake Geneva & ValaisSwitzerland · about 40 miles
Balanced Overall 6.4 · Very good weather, 71°F (22°C) · Busy season · Cost expensive
PiedmontItaly · about 50 miles
Balanced Overall 7.9 · Excellent weather, 76°F (24°C) · Busy season · Cost pricey
Lyon & the French AlpsRhône-Alpes · France · about 100 miles
Balanced Overall 8.2 · Very good weather, 74°F (23°C) · Moderate season · Cost pricey
Milan, Lake Como & LombardyItaly · about 110 miles
Balanced Overall 7.2 · Excellent weather, 76°F (25°C) · Busy season · Cost pricey
French Riviera & ProvenceFrance · about 140 miles
Balanced Overall 7.9 · Excellent weather, 79°F (26°C) · Moderate season · Cost pricey
Elsewhere in Europe
Same dates, elsewhere in Europe
Aosta Valley's weather ranks 6 of 28 mountain regions this month. We found no mountain regions outside Italy with similar weather and a quieter visitor season.
How we knowSources, regional scope & scoring method Show detailsHide details
It's low season, 29% of the busiest month and 35% below its average month. That means about 7,300 overnight visitors on a typical September night across the region, 55% of them from Italy itself. Rentals booked through Airbnb, Booking, Expedia and Tripadvisor add up to 1,800 more: 25 for every 100 counted above. Some are the same properties counted twice.
| Climate suitability (HCI:Urban, 0–100) | 80 |
| How our weather was checked | Official climate averages for Aosta (Piazza Plouves) from the national weather service, every month: afternoon highs typically within 2°F (1.3°C), night lows off by more than 4°F (2°C), so not shown. |
| Tourist nights per 1,000 residents per day | 60 |
| Busiest month here | August · 206 |
| Visitors as share of people present | 5.6% |
| Rank among Europe's regions this month | 92nd percentile |
| Domestic share of nights | 55% |
| Platform rental nights per 100 counted nights | 25 |
| Visitor share if every platform night were extra | 6.9% |
| Regional hotel-price season | About usual (−4% vs this region's average month). Historical index from ISTAT, NIC consumer price index for accommodation services (ECOICOP 112), by region; no euro room-rate baseline. |
| Population used | 123,000 |
| Statistical region | ITC2 · Valle d’Aosta/Vallée d’Aoste |
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 (ISTAT, NIC consumer price index for accommodation services (ECOICOP 112), by region). Full method · this region's data.