Dinan

Brittany Weather in September

Average temperatures, rainfall, sunshine and the best places to visit in Brittany, France in September.

Planning a trip to Brittany, France this September? Here's what you need to know about the weather:

What to Expect in Brittany in September

Brittany, France is a region in France. September in Brittany generally has temperatures that range from mild to warm, with moderate precipitation. The month of September is in the summer season.

Temperatures

Based on our climate data spanning from 1990-2020, the average maximum temperature is mild in Porspoder at 18°C (64°F) to warm in Varennes at 23°C (73°F). Nighttime temperatures generally drop to 12°C (54°F) in Varennes and 15°C (59°F) in Porspoder.

For a closer look at conditions across Brittany, France, refer to the map below.

Precipitation

In September, precipitation varies across different areas. From moderate rainfall in Sixt-sur-Aff with an average of 53 mm (2.1 in) to moderate rainfall in Cancale with 85 mm (3.3 in).

Average sunshine

Sunshine is moderately available across various locations. In Saint Malo, you can expect around 169 hours of sunlight in September, which gives a pleasant combination of sun and shade. For those who want maximum sunshine, our weather planner can point you toward the sunniest places on Earth.

Explore Brittany by month

Pick a month to see the average temperature, rainfall and sunshine in Brittany — and find the best time to visit. (based on Saint Malo)

Best Places to Visit in Brittany in September

Click on a destination dot for more details. Toggle the map to compare temperatures or precipitation across Brittany.

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).

Popular Destinations in Brittany

What is the weather like in September for some of the most popular destinations in Brittany, France?

Temperature range in Brittany (September)

Precipitation variation in Brittany (September)

Saint Malo

In September Saint Malo generally has pleasant temperatures with maximum daytime temperatures around 20°C (68°F), minimum nighttime temperatures around 14°C (57°F) and moderate monthly rainfall. So on average the conditions are perfect that month.

August
September
October
Max temperature
22°C (72°F)
20°C (68°F)
17°C (63°F)
Min temperature
16°C (61°F)
14°C (57°F)
12°C (54°F)
Monthly sun hours
199 hours
169 hours
115 hours
Monthly rainfall
63 mm (2.5 in)
76 mm (3 in)
99 mm (3.9 in)
Monthly rainy days
12 days
13 days
15 days
Weather conditions

Carnac

In September Carnac generally has pleasant temperatures with maximum daytime temperatures around 20°C (68°F), minimum nighttime temperatures around 14°C (57°F) and moderate monthly rainfall. So on average the conditions are perfect that month.

August
September
October
Max temperature
22°C (72°F)
20°C (68°F)
17°C (63°F)
Min temperature
16°C (61°F)
14°C (57°F)
12°C (54°F)
Monthly rainfall
49 mm (1.9 in)
59 mm (2.3 in)
95 mm (3.7 in)
Monthly rainy days
13 days
14 days
16 days
Weather conditions

Rennes

In September Rennes generally has high temperatures with maximum daytime temperatures around 22°C (72°F), minimum nighttime temperatures around 11°C (52°F) and moderate monthly rainfall. So on average the conditions are perfect that month.

August
September
October
Max temperature
25°C (77°F)
22°C (72°F)
17°C (63°F)
Min temperature
14°C (57°F)
11°C (52°F)
9°C (48°F)
Monthly sun hours
205 hours
177 hours
119 hours
Monthly rainfall
54 mm (2.1 in)
57 mm (2.2 in)
75 mm (3 in)
Monthly rainy days
12 days
12 days
15 days
Weather conditions

Brest

In September Brest generally has pleasant temperatures with maximum daytime temperatures around 19°C (66°F), minimum nighttime temperatures around 13°C (55°F) and moderate monthly rainfall. So on average the conditions are pleasant that month.

August
September
October
Max temperature
21°C (70°F)
19°C (66°F)
17°C (63°F)
Min temperature
14°C (57°F)
13°C (55°F)
11°C (52°F)
Monthly sun hours
206 hours
168 hours
124 hours
Monthly rainfall
63 mm (2.5 in)
64 mm (2.5 in)
104 mm (4.1 in)
Monthly rainy days
15 days
15 days
18 days
Weather conditions

Dinan

In September Dinan generally has pleasant temperatures with maximum daytime temperatures around 21°C (70°F), minimum nighttime temperatures around 12°C (54°F) and moderate monthly rainfall. So on average the conditions are perfect that month.

August
September
October
Max temperature
24°C (75°F)
21°C (70°F)
17°C (63°F)
Min temperature
14°C (57°F)
12°C (54°F)
10°C (50°F)
Monthly sun hours
199 hours
169 hours
115 hours
Monthly rainfall
59 mm (2.3 in)
61 mm (2.4 in)
76 mm (3 in)
Monthly rainy days
12 days
13 days
15 days
Weather conditions

Is your destination not in the list? Have a look at all destinations in Brittany, in France.

Popular cities in September

Day & night temperatures, rainfall and average weather in Brittany in September.

City Weather Day temp Night temp Rainfall
Saint Malo 20°C (68°F) 14°C (57°F) 76 mm (3 in)
Carnac 20°C (68°F) 14°C (57°F) 59 mm (2.3 in)
Rennes 22°C (72°F) 11°C (52°F) 57 mm (2.2 in)
Brest 19°C (66°F) 13°C (55°F) 64 mm (2.5 in)
Dinan 21°C (70°F) 12°C (54°F) 61 mm (2.4 in)
Perros-Guirec 19°C (66°F) 14°C (57°F) 61 mm (2.4 in)

Brittany weather in September: frequently asked questions

What is the weather like in Brittany, France in September?

Expect perfect weather across Brittany, France in September. The popular destination of Saint Malo averages 20°C (68°F) by day and 14°C (57°F) at night during this summer month.

What is the average temperature in Brittany, France in September?

Daytime temperatures in Saint Malo peak at roughly 20°C (68°F) in September, dropping to about 14°C (57°F) overnight.

Does Brittany, France get a lot of rain in September?

September is on the drier side in Brittany, France. Saint Malo averages only about 76 mm (3 in), with most days staying dry.

Is September a Good Time to Visit Brittany, France?

We believe that September is one of the best times to visit Brittany, France with overall perfect weather in Saint Malo. It's worth noting that weather conditions might differ depending on the location you visit.

Generally speaking, July, August and September provide perfect weather in Saint Malo. The weather in January and December, on the other hand, tends to be poor.

Interested in more climate information?

We have much more information about the climate in Brittany.

Weather and climate has detailed information for every country in the world. Are you going to France? Get detailed historical weather averages for many cities in France.

Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.

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