Saint-Julien-en-Genevois Weather in September

September in Saint-Julien-en-Genevois averages 20°C (68°F) during the day and 10°C (50°F) at night. Quite a bit of rainfall is typical this month, with around 127 mm (5 in) on average. An umbrella is a good idea.

Rainfall in Saint-Julien-en-Genevois in September

Historically, September sees about 12 days of rain, with a monthly average of 127 mm (5 in). The rain this month tends to fall in heavier spells rather than light drizzle. When it rains, showers can be significant.

Temperature in Saint-Julien-en-Genevois in September

If you're visiting Saint-Julien-en-Genevois in September, expect highs of 20°C (68°F) and overnight lows around 10°C (50°F). Even when the weather is stable, mornings and evenings can still feel distinctly cool. At 10°C (50°F) overnight, it gets properly cold after dark. On the bright side, cold nights tend to make for excellent sleeping conditions.

Sunshine in Saint-Julien-en-Genevois in September

The area experiences a moderate amount of sunshine, with approximately 183 hours of sunlight expected. This means a decent mix of sun and overcast.

Average water temperature in September

The water sits at 20°C (68°F), which is a nice temperature for swimming. Not too cold, not too warm — most visitors are happy to spend time in the water.

If you favor pleasant temperatures and minimal rainfall, September is one of the best months to visit Saint-Julien-en-Genevois.

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

Saint-Julien-en-Genevois Temperature in September

Min Temperature 10°C (50°F)  

Max Temperature 20°C (68°F)  

Water Temperature 20°C (68°F) *  

Chance of Rain 40%  

Precipitation 127 mm (5 in)  

Rainy days 12 days  

Humidity 74% *  

Sunshine 183 hours *  

Percentage Sunshine 55% *  

* Data from: Geneva, Switzerland (8 KM, 5 Miles).

What to Wear in Saint-Julien-en-Genevois in September

For Saint-Julien-en-Genevois 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. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. Expect water temperatures of around 20°C (68°F), which is ideal for taking a refreshing dip. Bring swimwear and consider packing a towel for drying off. Sunglasses could come in handy during the sunnier parts of your trip.

What To Do in Saint-Julien-en-Genevois 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

3/10

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-Julien-en-Genevois's climate page.

More climate data for Saint-Julien-en-Genevois

Temperature Rainfall Sunshine Humidity Water Temp

See the full Saint-Julien-en-Genevois climate overview or explore weather in France.