Grilly Weather in September

September in Grilly 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 129 mm (5.1 in) on average. An umbrella is a good idea.

Rainfall in Grilly in September

Typically, you can expect about 12 days of rain this month, with 129 mm (5.1 in) on average. Individual showers can be quite heavy this month. A proper umbrella or rain jacket is worth having.

Temperature in Grilly in September

Expect highs of 20°C (68°F) in Grilly in September, with nights dropping to around 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 Grilly in September

You can expect a moderate amount of sunlight, with approximately 183 hours. This means a pleasant 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 your ideal day consists of dry skies and pleasant temperatures, June, July, August and September typically offer the best circumstances for Grilly.

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

Grilly Temperature in September

Min Temperature 10°C (50°F)  

Max Temperature 20°C (68°F)  

Water Temperature 20°C (68°F) *  

Chance of Rain 41%  

Precipitation 129 mm (5.1 in)  

Rainy days 12 days  

Humidity 74% *  

Sunshine 183 hours *  

Percentage Sunshine 55% *  

* Data from: Geneva, Switzerland (13 KM, 8 Miles).

What to Wear in Grilly 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. 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. Bring sunglasses since you'll have some sunny periods throughout the month

What To Do in Grilly 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

6/10

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 Grilly's climate page.

More climate data for Grilly

Temperature Rainfall Sunshine Humidity Water Temp

See the full Grilly climate overview or explore weather in France.