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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.
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).
Saint-Julien-en-Genevois Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Saint-Julien-en-Genevois - 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-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.
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Swimming6/10 -
Cycling9/10 -
Walking9/10 -
Camping3/10 -
Outdoor sports9/10
Saint-Julien-en-Genevois 3-Day Forecast
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.
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