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Hourly Forecast
Daylight Hours
07:43
Sunrise
19:45
Sunset
Moon
Waxing Gibbous
17:25
Moonrise
01:14
Moonset
Daily Forecast
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View stargazing scoreWeather in Saint-Germain-en-Laye today, September 20, 2026
Expect a muted, overcast feel in Saint-Germain-en-Laye on September 20, 2026 as cloud persists. Brighter breaks, if they arrive, should stay brief.
Temperatures climb from an overnight low near 13°C toward a daytime high of about 23°C. The air stays humid, with relative humidity between 65% and 74% and the peak around 21:00. A lighter breeze peaks around 18:00 near 3.6 km/h.
Through the afternoon cloud remains the main feature, with cover near 100% around 20:00. Bright spells should stay limited even as the day wears on. Horizontal visibility sits around 37.0 km, briefly nearer 34.5 km. Expect sunrise at 07:43, sunset at 19:45, and 12 hours 1 minutes of sunlight today overall.
Overall, Saint-Germain-en-Laye on September 20, 2026 stays grey and muted, so outdoor plans may want a flexible backup even with a high near 23°C.
Frequently asked questions about weather in Saint-Germain-en-Laye
How warm does it get in Saint-Germain-en-Laye?
The warmest month in Saint-Germain-en-Laye is July, with average high temperatures of 25°C. The average temperature during this period is around 20°C.
How cold does it get in Saint-Germain-en-Laye?
The coldest month in Saint-Germain-en-Laye 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-Germain-en-Laye?
The wettest month in Saint-Germain-en-Laye is October, with an average of 79mm of precipitation.
What is the driest time of year in Saint-Germain-en-Laye?
The driest month in Saint-Germain-en-Laye is July, with an average of 49mm of precipitation.
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