Your September weather guide
HotWeather in Rome in September
Yes, September is a good time to visit Rome if you want warm days and can accept some rain. Average daytime highs of 25.4°C make light clothing sensible, while nights around 16.5°C call for a layer rather than a summer-only suitcase. The catch is about 9 rainy days, so this is not a reliably dry city break. It suits travellers who want warmth without depending on every day being clear.
Long-term climate averages for Rome, not a forecast · 1991-2020
Rome, month by month
Your snapshot
At a glance
The useful details for Rome.
- Average daytime high
- 25.4°C
- 9 in 10 days stay below 29°C
- Average night-time low
- 16.5°C
- coldest 10% of nights: 13°C or lower
- Compared with London
- +6.8°C
- London averages 18.6°C in September
- Sea temperature
- 23.9°C
- year to year: 23°C to 25°C
- Sunshine per day (est.)
- 7.5h
- 61% of 12.3 h of daylight
- Rainy days (1 mm+)
- 9
- 81 mm over the month
- Humidity
- 73%
- Days over 25°C
- 56%
- 7% over 30°C
- Record high 1991-2020
- 34.2°C
- 2020-09-13
- Record low 1991-2020
- 9.3°C
- 2018-09-27
- Flight from London
- ≈ 2 h 30 min
- 1411 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 Rome and ranks 85th of 134 destinations we compare for September - see where else is hot in September. Within Italy it is 3rd of 16 (Italy in September). Against London's average high of 18.6°C in September, Rome is 6.8°C warmer by day and 5.3°C warmer at night.
Daytime and night-time in September
The typical September day in Rome peaks at 25.4°C, but that is an average: the warmest 10% of days reach 29.3°C or more. About 56% of days top 25°C and 1 in 15 pass 30°C. Nights average 16.5°C; one night in ten drops to 13.2°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest September day here reached 34.2°C (2020-09-13) and the coldest night 9.3°C (2018-09-27).
Rain in September
Wet (more than 8 rainy days): about 9 days with 1 mm or more, 81 mm in total. Year to year it varies a lot - the wettest September was 1996 with 157 mm, the driest 2011 with 25 mm. Humidity averages 73%.
Sea temperature in September
The sea averages 23.9°C - warm enough to swim (22°c+). Depending on the year it ranges from 22.5°C to 25.0°C. For the warmest sea here, come in August (25.7°C).
Sunshine and daylight
Around 7.5 hours of sunshine a day (estimated from cloud cover), 12.3 hours of daylight: the sun rises about 06:50 and sets about 19:20 local time in mid-September. Average cloud cover is 39%.
Is September a good time to visit Rome?
Yes - it is one of the better months: hot days, manageable rain and long sunny days. The best months for Rome on our scoring are July, August, June; months averaging 25°C or more: Jun, Jul, Aug, Sep.
Warm days, with a cooler edge after dark
Expect warmth to shape your plans, but not relentless heat. Days reach 25°C on 56% of occasions, while 30°C is reached on just 7%, so very hot weather is possible rather than typical. Keep outdoor walking flexible and take a shaded break around midday if the heat feels tiring. Light, breathable clothes are a sensible daytime choice, with a jumper or light jacket for sitting outside after dark. The colder nights can fall to 13.2°C or below, so packing only for summer would be a mistake. September suits you if you enjoy warm afternoons but prefer some relief in the evening.
Make room for rain without writing off outdoor plans
Rain is the main compromise, and a waterproof layer deserves space in your bag. About 9 rainy days means you should have indoor alternatives, though it does not mean those days will be wet throughout. There is still about 7.5 hours of sunshine a day within 12.3 hours of daylight, leaving useful scope for outdoor time. Avoid making every part of your itinerary depend on dry weather, and use the forecast to decide when to spend longer outside. Humidity averages 73%, so breathable clothing is sensible when it is warm. This is a workable mix for a flexible city break, less so for anyone demanding dry skies.
A little perspective
Rome through the year
September is highlighted. See how it compares with the rest of the year.
| Month | Day | Night | Sea | Sun/day | Rain mm | Rainy days | Days 25°C+ |
|---|---|---|---|---|---|---|---|
| January | 11.6°C | 3.7°C | 14.7°C | 4.5 | 63 | 9 | 0% |
| February | 12.3°C | 3.7°C | 13.9°C | 5.4 | 72 | 9 | 0% |
| March | 15.2°C | 5.9°C | 13.9°C | 5.8 | 75 | 10 | 0% |
| April | 18.0°C | 8.6°C | 15.2°C | 6.5 | 78 | 11 | 1% |
| May | 22.4°C | 12.5°C | 18.4°C | 8.0 | 58 | 9 | 23% |
| Junebest | 27.0°C | 16.6°C | 22.1°C | 10.2 | 33 | 5 | 71% |
| Julybest | 30.2°C | 19.4°C | 24.7°C | 12.0 | 22 | 4 | 95% |
| Augustbest | 30.6°C | 20.1°C | 25.7°C | 10.7 | 22 | 4 | 96% |
| SeptemberSelected | 25.4°C | 16.5°C | 23.9°C | 7.5 | 81 | 9 | 56% |
| October | 21.0°C | 13.0°C | 21.5°C | 5.5 | 116 | 11 | 7% |
| November | 16.1°C | 9.0°C | 18.9°C | 4.3 | 130 | 12 | 0% |
| December | 12.4°C | 5.1°C | 16.3°C | 4.4 | 92 | 11 | 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
- Sea
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.
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Flic en Flac
Spain · 26°C by day · sea 24°C
Salou
Spain · 25°C by day · sea 23°C
Fuerteventura
Greece · 25°C by day · sea 25°C
Parga
Albania · 26°C by day · sea 24°C
Saranda
A little more detail
Rome in September FAQs
Plain answers, grounded in the averages.
Is Rome hot in September?
Rome is hot in September: the average daytime high is 25.4°C and nights average 16.5°C. About 56% of September days reach 25°C or more.
Can you swim in the sea in Rome in September?
The sea around Rome averages 23.9°C in September, which is warm enough for most people to swim comfortably. Between 1991 and 2020 it ranged from 23°C to 25°C depending on the year.
How much does it rain in Rome in September?
Rome sees about 9 rainy days (1 mm or more) and 81 mm of rain in a typical September. The wettest September between 1991 and 2020 was 1996 (157 mm) and the driest was 2011 (25 mm).
How sunny is Rome in September?
Rome gets around 7.5 hours of sunshine a day in September out of 12.3 hours of daylight (estimated from average cloud cover).
How does Rome compare with the UK in September?
Rome is on average 6.8°C warmer than London by day in September (25.4°C against 18.6°C).
What is the hottest September on record in Rome?
Between 1991 and 2020 the hottest September day in Rome reached 34.2°C on 2020-09-13, and the coldest night dropped to 9.3°C on 2018-09-27.
How much warmer is Rome than London in September?
Rome's average daytime high is 25.4°C, compared with 18.6°C in London, a difference of 6.8°C. That is a noticeable step up in warmth, so pack lighter daytime clothing rather than simply taking your usual September wardrobe.
Is the sea warm enough for swimming?
Yes, if you plan to include time by the sea. September's sea temperature averages 23.9°C, with a year-to-year range of 22°C to 25°C. That puts it in the swimming range, although your comfort will still depend on personal preference.
Is Rome a short flight from London?
Yes. The flight from London takes about 2 h 30 min, making Rome a short-haul option for September warmth. That is flight time rather than your full journey time, so allow separately for getting to and from the airports.
About these averages
ERA5-Land climate reanalysis via Open-Meteo (11 km grid) and NOAA Coral Reef Watch 5 km sea temperatures, 1991-2020
Averages computed from daily values at Rome. Sea temperature from the nearest 5 km sea cell, 26.6 km from that point. 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