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 perfect 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.

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Check the conditions for any month of the year.

• January
• February
• March
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• May
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• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit France, check out our Saint-Louis's climate page.

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).

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.

Swimming

6/10

Cycling

9/10

Walking

9/10

Camping

8/10

Outdoor sports

9/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit France, check out our Saint-Louis's climate page.

More climate data for Saint-Louis

Temperature Rainfall Sunshine Humidity

See the full Saint-Louis climate overview or explore weather in France.