Monaco Monaco Weather in September — Climate Guide
September in Monaco is high
Monaco Weather in September — Quick Answer
As of 2026- Avg temp
- 25° / 19°
- Rainfall
- 65mm · 5 days
- Crowds
- Busy
As of 2026, Monaco in September averages a high of 25°C and low of 19°C with 65mm of rain over about 5 days. Warm, settled early autumn — around 25°C/19°C with a still-warm sea (~23°C). Summer clothing by day, a light layer for evenings, sunglasses and SPF. One of the best months.
September is high for Monaco.
September is one of the best months to visit — warm and settled at 25°C/19°C, with the sea still a balmy 23°C and the August crowds thinning out.
The marquee event is the Monaco Yacht Show (late September), the world's leading superyacht exhibition, which fills Port Hercule with the largest yachts afloat — spectacular to see, though it pushes hotel prices up that week.
Travel score
Monaco September Weather Stats
Avg High
25°C
Avg Low
19°C
Rainy Days
5
65mm total
Sunshine
8h
Daily avg
Humidity
70%
comfortable
UV Index
7
High
Wind
10 km/h
Gusts 20
Sea Temp
23°C
Avg water temp
Crowds
Busy
At attractions
September Sunrise & Sunset
Air Quality
PM2.5
18 μg/m³
PM10
33 μg/m³
Status
good
Feels-Like Temperature & Wind
Feels like
Daytime
26°C
Nighttime
20°C
Humidity and wind affect how the actual temperature feels.
Wind
10 km/h
Max gust 20 km/h
Activities Recommended for September
September Travel Pros & Cons
Pros
- Warm weather with thinner crowds
- Sea still warm for swimming (~23°C)
- Monaco Yacht Show spectacle
- Great for both beach and sightseeing
Cons
- Yacht Show week spikes prices
- Slightly more rain than summer
- Still high season pricing
September Events & Festivals
- Monaco Yacht Show (late September) — the world's premier superyacht show
- Warm sea continues — excellent late swimming
- Crowds ease after the August peak
Monaco in September — Full Picture
September is one of the best months to visit — warm and settled at 25°C/19°C, with the sea still a balmy 23°C and the August crowds thinning out.
The marquee event is the Monaco Yacht Show (late September), the world's leading superyacht exhibition, which fills Port Hercule with the largest yachts afloat — spectacular to see, though it pushes hotel prices up that week.
Otherwise it's ideal: warm enough to swim at Larvotto, comfortable for the old town and circuit walk, and pleasant for day trips to Èze, Menton, and Nice without summer's intensity. Rain ticks up slightly from the dry summer, but sunshine still dominates.
Note: book around the Yacht Show week, when accommodation gets scarce and pricey.
What to Wear & What to Pack
Warm, settled early autumn — around 25°C/19°C with a still-warm sea (~23°C). Summer clothing by day, a light layer for evenings, sunglasses and SPF. One of the best months.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
17.7°C
11.3°C
5.7/mo
Summer (Jun·Jul·Aug)
27°C
20.3°C
3/mo
Autumn (Sep·Oct·Nov)
Current21°C
15°C
6.3/mo
Winter (Dec·Jan·Feb)
13.3°C
8.3°C
6.3/mo
Monaco Monthly Weather Comparison
| Month | High | Low | Rain | Sun | Humid | UV | Crowd | Price |
|---|---|---|---|---|---|---|---|---|
| 13° | 8° | 7d·75mm | 5h | 70% | 2 | Quiet | Low season | |
| 13° | 8° | 6d·70mm | 6h | 70% | 2 | Quiet | Low season | |
| 15° | 9° | 6d·70mm | 6.5h | 68% | 4 | Moderate | Shoulder | |
| April (Best) | 17° | 11° | 6d·70mm | 7.5h | 68% | 5 | Busy | Peak |
| May (Best) | 21° | 14° | 5d·50mm | 8h | 70% | 7 | Busy | Peak |
| 25° | 18° | 4d·40mm | 9.5h | 70% | 9 | Very busy | Peak | |
| 28° | 21° | 2d·25mm | 10.5h | 70% | 10 | Very busy | Peak | |
| 28° | 22° | 3d·30mm | 10h | 70% | 9 | Very busy | Peak | |
| September (Best) | 25° | 19° | 5d·65mm | 8h | 70% | 7 | Busy | Peak |
| 21° | 15° | 7d·110mm | 6.5h | 72% | 4 | Moderate | Shoulder | |
| 17° | 11° | 7d·135mm | 5h | 73% | 2 | Quiet | Low season | |
| 14° | 9° | 6d·85mm | 5h | 71% | 2 | Moderate | Shoulder |
View Other Months
Monaco September Hotel Picks
Frequently Asked Questions
Is September a good time to visit Monaco?
Monaco in September is high. Tourist crowds are busy and flight/hotel prices are peak.
What's the average temperature in Monaco in September?
Monaco September averages a high of 25°C and a low of 19°C.
Does it rain much in Monaco in September?
Monaco September averages 65mm of rainfall over about 5 rainy days.
What should I wear in Monaco in September?
Warm, settled early autumn — around 25°C/19°C with a still-warm sea (~23°C). Summer clothing by day, a light layer for evenings, sunglasses and SPF. One of the best months.
What time are sunrise and sunset in Monaco in September?
Monaco September sunrise is 07:05 and sunset is 19:40, with 12h 35min of daylight.
What's the air quality like in Monaco in September?
Monaco September air quality (AQI) averages 47, rated Good. PM2.5 averages 18μg/m³.
What activities are recommended in Monaco in September?
In September, Monaco is great for Monaco Yacht Show (late September), Larvotto beach (warm sea), Casino, Oceanographic Museum, old town.
Is September peak season in Monaco?
Monaco September crowds are busy and prices are peak. Advance reservations are strongly recommended.
Best Months to Visit Monaco
View Other Months
Planning a September trip to Monaco?
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Why you can trust weather guide
Based in Chiang Mai for 8+ years, with 30+ countries visited across Southeast Asia, Japan, and Europe. Every detail in this guide is primary-source verified as of April 2026, with prices auto-refreshed via live exchange rate APIs. This isn't AI-generated boilerplate — it's written from the perspective of someone who has actually been there.