Guyancourt Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Guyancourt.
Climate overview of Guyancourt
Guyancourt, Ile de France, France, experiences significant temperature variation throughout the year. Summers bring daytime highs of 26°C (79°F) in July, while winters cool to 8°C (46°F) in February.
Guyancourt sees a moderate amount of rain/snowfall, totalling around 747 mm (29 in) per year. July is the sunniest month, averaging 7.5 hours of sunshine per day.
Guyancourt Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Guyancourt — and find the best time to visit.
Monthly Temperature in Guyancourt
Depending on the time of the year, temperatures range from comfortable to chilly in Guyancourt. Average maximum daytime temperatures range from a comfortable 26°C (79°F) in July, the warmest time of the year, to a chilly 8°C (46°F) during cooler months like February.
At night, you can expect temperatures ranging from 14°C (57°F) in July to around 2°C (36°F) during February.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Guyancourt
Generally, Guyancourt has a moderate amount of precipitation, averaging 747 mm (29 in) of rain/snowfall annually. Year-round, Guyancourt has a balanced climate with minimal variation in precipitation. The difference between the wettest month, December, with 74 mm (2.9 in), and the driest month, September, with 54 mm (2.1 in), is minimal. For more details, please visit our Guyancourt Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Guyancourt
Seasonal changes in sunshine hours are quite dramatic in Guyancourt. While July receives considerable daily sunshine with up to 7.5 hours, December marks the darkest time of the year, where sunshine is scarce with only 1.9 hours of sunlight per day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Humidity in Guyancourt by Month
The relative humidity is high throughout the year in Guyancourt.
The city experiences its highest humidity in November, reaching 84%. In April, the humidity drops to its lowest level at 69%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Guyancourt
Rainfall during this time ranges from 54 mm (2.1 in) in September to 71 mm (2.8 in) in May. This means you can expect a mix of sunny days and occasional showers. Looking for inspiration on where to travel this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.
Frequently asked questions about the climate in Guyancourt
What is the best time to visit Guyancourt?
May, June, July, August and September typically offer the most optimal weather in Guyancourt. In contrast, January, February and December tend to have less optimal conditions.
What temperatures can I expect in Guyancourt?
Daytime highs range from 8°C (46°F) in February to 26°C (79°F) in July. Nighttime lows range from 2°C (36°F) to 14°C (57°F). Temperatures vary considerably through the year.
How much rain does Guyancourt get?
Annual rainfall is around 747 mm (29 in). December is the wettest month with 74 mm (2.9 in), while September is the driest with 54 mm (2.1 in).
How sunny is Guyancourt?
Guyancourt receives around 1,725 hours of sunshine per year. July is the sunniest month with 224 hours, while December is the cloudiest with just 58 hours.
Guyancourt 3-Day Forecast
Guyancourt 3-Day Forecast
Guyancourt on the map
Guyancourt is highlighted — select any city to see its climate.
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Where to go in July — average daytime high across popular destinations.
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