Your September weather guide
WarmWeather in Milan in September
September is a good time for Milan if you want warm city weather rather than intense heat, but rain is the catch. Average daytime highs are around 23°C, nights fall to 14°C, and there are about 9 rainy days during the month. For a UK traveller, that makes it a useful option for walking around in lighter clothes by day, provided you pack an evening layer and keep outdoor plans flexible.
Long-term climate averages for Milan, not a forecast · 1991-2020
Milan, month by month
Your snapshot
At a glance
The useful details for Milan.
- Average daytime high
- 22.8°C
- 9 in 10 days stay below 27°C
- Average night-time low
- 14.1°C
- coldest 10% of nights: 10°C or lower
- Compared with London
- +4.2°C
- London averages 18.6°C in September
- Sunshine per day (est.)
- 6.4h
- 52% of 12.3 h of daylight
- Rainy days (1 mm+)
- 9
- 118 mm over the month
- Humidity
- 72%
- Days over 25°C
- 26%
- 1% over 30°C
- Record high 1991-2020
- 31.7°C
- 2004-09-04
- Record low 1991-2020
- 5.4°C
- 2002-09-26
- Flight from London
- ≈ 1 h 54 min
- 937 km, short-haul (estimate for a direct flight)
Records are observed extremes within 1991-2020, not typical holiday conditions. Warm-day percentages are shares of days, not day counts.
How September compares
September is the 4th warmest month of the year in Milan and ranks 122nd of 134 destinations we compare for September - see where else is hot in September. Within Italy it is 12th of 16 (Italy in September). Against London's average high of 18.6°C in September, Milan is 4.2°C warmer by day and 2.9°C warmer at night.
Daytime and night-time in September
The typical September day in Milan peaks at 22.8°C, but that is an average: the warmest 10% of days reach 27.3°C or more. Roughly 1 in 4 days top 25°C and 1 in 111 pass 30°C. Nights average 14.1°C; one night in ten drops to 10.3°C or lower, so pack a layer for evenings - it is genuinely cool after dark. Between 1991 and 2020 the hottest September day here reached 31.7°C (2004-09-04) and the coldest night 5.4°C (2002-09-26).
Rain in September
Wet (more than 8 rainy days): about 9 days with 1 mm or more, 118 mm in total. Year to year it varies a lot - the wettest September was 1994 with 262 mm, the driest 1997 with 25 mm. Humidity averages 72%.
Sunshine and daylight
Around 6.4 hours of sunshine a day (estimated from cloud cover), 12.3 hours of daylight: the sun rises about 07:02 and sets about 19:35 local time in mid-September. Average cloud cover is 48%.
Is September a good time to visit Milan?
It is a reasonable choice: warm days but expect showers. The best months for Milan on our scoring are July, August, June; months averaging 25°C or more: Jun, Jul, Aug.
Warm days, with a noticeable evening cool-down
Milan in September suits travellers who enjoy warmth without needing consistently hot weather. A light outfit should work well around the average daytime high, though warmer spells can make a long walk at midday feel less comfortable. The warmest days reach around 27°C or more, so sunglasses and sun protection still belong in your bag. After sunset, plan to add a jumper or light jacket rather than relying on daytime clothing. The coldest nights can fall to around 10°C or below, making an extra layer useful if you expect to stay out late. Pack for that range rather than treating September as uninterrupted summer.
Allow room for rain in your plans
Rain is the main compromise, so September is less suitable if your trip depends on spending every day outdoors. About 9 days have measurable rain, but that does not mean those days are wet throughout. Equally, the monthly pattern cannot tell you which part of your stay will be dry. A compact umbrella, a light waterproof and shoes you are comfortable wearing in wet conditions are sensible choices. There is still about 6.4 hours of sunshine a day on average, within 12.3 hours of daylight, leaving scope for outdoor time. Keep indoor alternatives available and use the local forecast to decide when to take longer walks.
A little perspective
Milan through the year
September is highlighted. See how it compares with the rest of the year.
| Month | Day | Night | Sun/day | Rain mm | Rainy days | Days 25°C+ |
|---|---|---|---|---|---|---|
| January | 6.9°C | -1.0°C | 3.9 | 61 | 7 | 0% |
| February | 9.1°C | -0.3°C | 4.9 | 59 | 7 | 0% |
| March | 13.7°C | 3.2°C | 5.8 | 73 | 8 | 0% |
| April | 17.3°C | 7.1°C | 6.0 | 98 | 11 | 1% |
| May | 21.7°C | 11.7°C | 6.5 | 111 | 12 | 18% |
| Junebest | 26.0°C | 15.8°C | 7.8 | 101 | 11 | 60% |
| Julybest | 28.6°C | 18.3°C | 9.0 | 77 | 9 | 87% |
| Augustbest | 28.0°C | 18.4°C | 8.1 | 105 | 10 | 81% |
| SeptemberSelected | 22.8°C | 14.1°C | 6.4 | 118 | 9 | 26% |
| October | 17.2°C | 9.8°C | 4.2 | 127 | 10 | 1% |
| November | 11.4°C | 4.6°C | 3.3 | 141 | 11 | 0% |
| December | 7.0°C | -0.1°C | 3.5 | 73 | 7 | 0% |
Day = average daytime high, night = average night-time low, 1991-2020.Sun is hours per day; rainy days count 1 mm or more.
Day, night and sea
Monthly average temperatures, 1991-2020
- Day
- Night
Best months here
On warmth, low rainfall and sunshine, start with these.
Keep exploring
Similar in September
Closest matches on daytime temperature, sea temperature and sunshine, in other countries.
Croatia · 23°C by day · sea 23°C
Pula
Bulgaria · 23°C by day · sea 23°C
Sunny Beach
France · 24°C by day · sea 23°C
Nice
United States · 24°C by day · sea 21°C
New York
Portugal · 24°C by day · sea 18°C
Porto
A little more detail
Milan in September FAQs
Plain answers, grounded in the averages.
Is Milan hot in September?
Milan is warm in September: the average daytime high is 22.8°C and nights average 14.1°C. Roughly 1 in 4 September days reach 25°C.
How much does it rain in Milan in September?
Milan sees about 9 rainy days (1 mm or more) and 118 mm of rain in a typical September. The wettest September between 1991 and 2020 was 1994 (262 mm) and the driest was 1997 (25 mm).
How sunny is Milan in September?
Milan gets around 6.4 hours of sunshine a day in September out of 12.3 hours of daylight (estimated from average cloud cover).
How does Milan compare with the UK in September?
Milan is on average 4.2°C warmer than London by day in September (22.8°C against 18.6°C).
What is the hottest September on record in Milan?
Between 1991 and 2020 the hottest September day in Milan reached 31.7°C on 2004-09-04, and the coldest night dropped to 5.4°C on 2002-09-26.
Is Milan warmer than London in September?
Yes. Milan's average daytime high is 22.8°C, compared with 18.6°C in London, a difference of 4.2°C. That is a noticeable lift in daytime warmth, although Milan's cooler nights mean you should still bring a layer for evenings.
Will it be hot enough for summer clothes?
Summer clothes are useful for warmer afternoons, but not for every part of the day. Temperatures reach 25°C on 26% of days, while 30°C is reached on just 1%. Pack light daytime clothes alongside a jumper and rain protection.
About these averages
ERA5-Land climate reanalysis via Open-Meteo (11 km grid), 1991-2020
Averages computed from daily values at Milan. Sunshine hours are estimated from average cloud cover.Records are the highest and lowest daily values in that 30-year period, not all-time records. These are climate averages, not a forecast for your trip. How we measure holiday weather
- Hot · 25°C+
- Warm · 20°C to below 25°C
- Mild · 15°C to below 20°C
- Cool · below 15°C