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Monte Carlo Weather in September
During September, Monte Carlo experiences high daytime temperatures of 23°C (73°F) and cooler nights around 18°C (64°F). Expect quite a bit of rainfall. Around 76 mm (3 in) is typical.
Rainfall in Monte Carlo in September
Expect around 7 days of rain based on historical data, with 76 mm (3 in) average. Individual showers can be quite heavy this month. A proper umbrella or rain jacket is worth having.
Temperature in Monte Carlo in September
September tends to be one of the excellent months in Monte Carlo, with 23°C (73°F) in the afternoon and 18°C (64°F) overnight. The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. At 18°C (64°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping.
Sunshine in Monte Carlo in September
There are approximately 242 hours of sunshine this month, resulting in mostly clear days.
Average water temperature in September
With water at 22°C (72°F), you can expect warm, pleasant conditions for any water activity. There's no adjustment period, it feels comfortable straight away.If you're inclined towards comfortable temperatures and drier conditions, September is a good time to visit Monte Carlo.
Monte Carlo Temperature in September
Min Temperature
18°C (64°F)
Max Temperature
23°C (73°F)
Water Temperature
22°C (72°F)
Chance of Rain
25%
Precipitation
76 mm (3 in)
Rainy days
7 days
Sunshine
242 hours
Percentage Sunshine
67%
Monte Carlo Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Monte Carlo - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Monte Carlo typically stay consistent throughout September, with daily highs averaging around 23°C (73°F). Nights are pleasant, with lows typically ranging from 16°C (61°F) to 19°C (66°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather records for Monte Carlo in September
Browse day-by-day weather records for Monte Carlo spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Monte Carlo historical weather extremes in September
Based on weather observations in Monte Carlo between 1976 and 2026, these are the recorded extremes during September.
- The hottest September day on record in Monte Carlo reached 33°C (91°F) (September 4, 2009).
- On September 25, 2025, Monte Carlo saw its coldest September day with temperatures maxing out at 14°C (57°F).
- Nighttime temperatures dropped to 7°C (45°F) on September 25, 2025, marking the coldest September night on record.
Best Places in Monaco in September
Find out more about the weather in Monaco and which places have the best travel conditions in this month. See all of Monaco in September →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Monte Carlo in September
For Monte Carlo in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. Rain is likely on several days, so bring a good rain jacket. The water temperature sits at about 22°C (72°F), making it perfect for swimming and water activities. Don't forget to pack your favorite swimwear and perhaps some snorkel gear. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.
What To Do in Monte Carlo in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Cycling9/10 -
Walking9/10 -
Barbeque8/10 -
Camping8/10 -
Outdoor sports9/10
Monte Carlo 3-Day Forecast
More climate data for Monte Carlo
Temperature Rainfall Sunshine Water Temp
See the full Monte Carlo climate overview or explore weather in Monaco.
Popular in September
Where to go in September - average daytime high across popular destinations.
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