Monaco weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Excellent
Best time to visit: April – October
What is the weather like in Monaco in September?
In September, Monaco is warm: daytime highs average 24 °C, and nights cool down to about 18 °C. The sea averages 22.8 °C – refreshing for a swim. The sun shines for around 8 hours a day. Rain falls on about 8 days, adding up to 63 mm. All in all, September is an excellent month for a holiday in Monaco.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 88 | 88 | 80 |
| Day | 28° | 24° | 20° |
| Night | 21° | 18° | 14° |
| Sea | 25° | 23° | 20° |
| Sun | 10 h | 8 h | 6 h |
| Rain days | 7 | 8 | 9 |
More details for September
- Daylight
- 12 h 35 min07:08 – 19:43
- UV index
- 5 · moderateclear sky, noon (estimate)All months
- Muggy days
- 4 daysdew point 18 °C or more
- Wind
- 11 km/haverage daily peak
- Cloud cover
- 45 %on average
- Hot days
- 0 days30 °C or more
- Snow days
- 0 days1 cm or more of fresh snow
- Time zone
- UTC+2Europe/Monaco
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %88 %
- Few rainy daysweight 30 %69 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Rain jacket or umbrella
Monaco in September: quick answers
Is Monaco hot in September?
Warm rather than hot: in September, daytime highs in Monaco average 24 °C and nights cool to about 18 °C.
Can you swim in Monaco in September?
Yes. In September the sea averages 22.8 °C – refreshing for a swim.
Does it rain much in Monaco in September?
Rain falls on about 8 days, adding up to 63 mm.
Monaco month by month
The whole year in MonacoAll destinations: MonacoWhere to go in SeptemberSea temperature in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0)