See exactly when rain will start and stop with a minute-by-minute precipitation nowcast for the next hour.
20°
Overcast
Feels Like: 20°
Min: 17°
Max: 21°
The next few hours will be overcast, with today reaching 21°C and dropping to 15°C. The coming days will be partly cloudy
Compare today's weather with yesterday's data and track temperature trends over time.
Hourly Forecast
Daylight Hours
07:58
Sunrise
19:24
Sunset
Moon
Waning Gibbous
20:55
Moonrise
12:46
Moonset
Daily Forecast
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Thursday
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View stargazing scoreWeather in Saint-Arnoult-en-Yvelines today, September 30, 2026
Saint-Arnoult-en-Yvelines looks damp on September 30, 2026, so plan for wet spells during the day. Early travel and outdoor time should assume rain can arrive quickly. The morning carries the wetter risk, with rain chances near 38% and the highest odds around 10:00. Cloud is also thick early on, peaking near 100% around 05:00.
Expect highs of 21°C and cooler readings close to 17°C. Moisture in the air spans 70%-96%, with the highest values around 22:00. Airflow remains manageable, reaching about 4.2 km/h around 16:00.
Afternoon showers stay in play, peaking near 98% around 18:00. Skies remain cluttered, with cover about 100% by 12:00. Visibility holds near 24.4 km, though it can fall to 0.7 km. Expect sunrise at 07:58, sunset at 19:24, and 11 hours 25 minutes of sunlight today overall.
Taken together, Saint-Arnoult-en-Yvelines looks wet enough on September 30, 2026 that flexible outdoor plans work best, with temperatures peaking near 21°C.
Frequently asked questions about weather in Saint-Arnoult-en-Yvelines
How warm does it get in Saint-Arnoult-en-Yvelines?
The warmest month in Saint-Arnoult-en-Yvelines is July, with average high temperatures of 26°C. The average temperature during this period is around 20°C.
How cold does it get in Saint-Arnoult-en-Yvelines?
The coldest month in Saint-Arnoult-en-Yvelines is January, with average low temperatures of 2°C. The average temperature during this period is around 5°C.
What is the wettest time of year in Saint-Arnoult-en-Yvelines?
The wettest month in Saint-Arnoult-en-Yvelines is October, with an average of 80mm of precipitation.
What is the driest time of year in Saint-Arnoult-en-Yvelines?
The driest month in Saint-Arnoult-en-Yvelines is July, with an average of 44mm of precipitation.
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