Your September weather guide
WarmWeather in Paris in September
September is a good time to visit Paris if you want comfortable walking weather rather than dependable heat. Average daytime highs of 21°C suit being outdoors, but nights around 12°C call for a jacket. The catch is rain, with about 8 rainy days during the month, so keep your plans flexible. For a UK traveller, it offers a modest step up in warmth, not a reliably hot or dry holiday.
Long-term climate averages for Paris, not a forecast · 1991-2020
Paris, month by month
Your snapshot
At a glance
The useful details for Paris.
- Average daytime high
- 20.6°C
- 9 in 10 days stay below 26°C
- Average night-time low
- 12.0°C
- coldest 10% of nights: 8°C or lower
- Compared with London
- +2.0°C
- London averages 18.6°C in September
- Sunshine per day (est.)
- 5.1h
- 41% of 12.3 h of daylight
- Rainy days (1 mm+)
- 8
- 48 mm over the month
- Humidity
- 73%
- Days over 25°C
- 13%
- 1% over 30°C
- Record high 1991-2020
- 33.2°C
- 2020-09-15
- Record low 1991-2020
- 4.5°C
- 2018-09-30
- Flight from London
- ≈ 1 h 6 min
- 313 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 Paris and ranks 128th of 134 destinations we compare for September - see where else is hot in September. Within France it is 2nd of 2 (France in September). Against London's average high of 18.6°C in September, Paris is 2.0°C warmer by day and 0.8°C warmer at night.
Daytime and night-time in September
The typical September day in Paris peaks at 20.6°C, but that is an average: the warmest 10% of days reach 25.7°C or more. Roughly 1 in 8 days top 25°C and 1 in 111 pass 30°C. Nights average 12.0°C; one night in ten drops to 8.2°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 33.2°C (2020-09-15) and the coldest night 4.5°C (2018-09-30).
Rain in September
Wet (more than 8 rainy days): about 8 days with 1 mm or more, 48 mm in total. Year to year it varies a lot - the wettest September was 1999 with 122 mm, the driest 1997 with 12 mm. Humidity averages 73%.
Sunshine and daylight
Around 5.1 hours of sunshine a day (estimated from cloud cover), 12.3 hours of daylight: the sun rises about 07:27 and sets about 20:04 local time in mid-September. Average cloud cover is 59%.
Is September a good time to visit Paris?
September is not the strongest month here: warm days and frequent rain. The best months for Paris on our scoring are July, August, June.
Warm afternoons, cooler evenings
The daytime average makes September well suited to exploring on foot without planning your whole day around avoiding heat. A light top may be enough when it feels warm, but carry a layer rather than dressing for summer throughout the day. Nights can be noticeably chilly: the coldest 10% fall to 8°C or below, which matters if you plan to sit outside after dark. Pack a jumper and a jacket you will actually want to wear in the evening. September suits travellers who prefer moderate warmth; if heat is the main reason for going, July, August and June are better choices overall.
Allow for rain and mixed skies
Rain is a real planning consideration, though it need not rule September out. With about 8 rainy days, a water-resistant jacket and shoes that cope with wet pavements are sensible packing choices. Keep outdoor plans movable and have an indoor alternative rather than relying on every day staying dry. Sunshine averages 5.1 hours out of 12.3 hours of daylight, so there is useful daylight for being out, but sunshine is far from guaranteed throughout it. The practical approach is to dress in layers and check the forecast before committing to a long stretch outdoors. Choose September for manageable temperatures, not for dependable clear skies.
A little perspective
Paris 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 | 7.1°C | 1.9°C | 2.1 | 52 | 11 | 0% |
| February | 8.3°C | 1.7°C | 2.9 | 47 | 10 | 0% |
| March | 11.8°C | 3.6°C | 4.0 | 51 | 10 | 0% |
| April | 15.1°C | 5.9°C | 5.1 | 50 | 11 | 1% |
| May | 18.6°C | 9.5°C | 5.3 | 66 | 12 | 7% |
| Junebest | 21.8°C | 12.8°C | 6.1 | 58 | 11 | 20% |
| Julybest | 24.2°C | 14.9°C | 6.6 | 54 | 10 | 39% |
| Augustbest | 24.3°C | 14.8°C | 6.0 | 58 | 9 | 38% |
| SeptemberSelected | 20.6°C | 12.0°C | 5.1 | 48 | 8 | 13% |
| October | 16.1°C | 9.1°C | 3.3 | 61 | 11 | 1% |
| November | 10.7°C | 5.2°C | 2.3 | 58 | 12 | 0% |
| December | 7.5°C | 2.5°C | 2.0 | 68 | 13 | 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.
A little more detail
Paris in September FAQs
Plain answers, grounded in the averages.
Is Paris hot in September?
Paris is warm in September: the average daytime high is 20.6°C and nights average 12.0°C. Roughly 1 in 8 September days reach 25°C.
How much does it rain in Paris in September?
Paris sees about 8 rainy days (1 mm or more) and 48 mm of rain in a typical September. The wettest September between 1991 and 2020 was 1999 (122 mm) and the driest was 1997 (12 mm).
How sunny is Paris in September?
Paris gets around 5.1 hours of sunshine a day in September out of 12.3 hours of daylight (estimated from average cloud cover).
How does Paris compare with the UK in September?
Paris is on average 2.0°C warmer than London by day in September (20.6°C against 18.6°C).
What is the hottest September on record in Paris?
Between 1991 and 2020 the hottest September day in Paris reached 33.2°C on 2020-09-15, and the coldest night dropped to 4.5°C on 2018-09-30.
Is Paris warmer than London in September?
Yes, but the difference is modest. Paris has an average daytime high of 20.6°C, compared with London's 18.6°C. That extra 2°C can make afternoons more comfortable, but it is not a reason to leave your jacket or rain protection at home.
Can Paris still get hot in September?
Yes, although hot weather is not the norm. Around 13% of days reach 25°C, while just 1% reach 30°C. Pack something light for warmer afternoons, but plan mainly for mild days and cooler evenings rather than sustained heat.
About these averages
ERA5-Land climate reanalysis via Open-Meteo (11 km grid), 1991-2020
Averages computed from daily values at Paris. 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