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Saint-Louis Weather in September
Saint-Louis in September averages 21°C (70°F) during the day and 10°C (50°F) at night. Keep in mind that quite a bit of rainfall is expected this month.
Rainfall in Saint-Louis in September
Historically, September sees about 12 days of rain, with a monthly average of 95 mm (3.7 in). When it rains this month, it tends to come down fairly heavily. Showers can be substantial even if they don't last all day.
Temperature in Saint-Louis in September
If you're visiting Saint-Louis in September, expect excellent temperatures with highs of 21°C (70°F) and overnight lows of 10°C (50°F). This creates a mild day-to-night pattern that is generally easy to manage with the right clothing. At 10°C (50°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 Saint-Louis in September
The area experiences a moderate amount of sunshine, with approximately 162 hours of sunlight expected. This means a decent mix of sun and overcast.If you're a fan of comfortable temperatures and drier conditions, September is a great time to visit.
Saint-Louis Temperature in September
Min Temperature
10°C (50°F)
Max Temperature
21°C (70°F)
Chance of Rain
41%
Precipitation
95 mm (3.7 in)
Rainy days
12 days
Humidity
77% *
Sunshine
162 hours *
Percentage Sunshine
47% *
* Data from: Basel, Switzerland (3 KM, 2 Miles).
Saint-Louis Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Saint-Louis - and find the best time to visit.
Best Places in France in September
Find out more about the weather in France and which places have the best travel conditions in this month. See all of France 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 Saint-Louis in September
Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Prepare for significant rainfall with proper waterproof clothing and shoes. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.
What To Do in Saint-Louis in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming6/10 -
Cycling9/10 -
Walking9/10 -
Camping8/10 -
Outdoor sports9/10
Saint-Louis 3-Day Forecast
More climate data for Saint-Louis
Temperature Rainfall Sunshine Humidity
See the full Saint-Louis climate overview or explore weather in France.
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Where to go in September - average daytime high across popular destinations.
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The 10 most charming villages in France
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