See exactly when rain will start and stop with a minute-by-minute precipitation nowcast for the next hour.
21°
Overcast
Feels Like: 21°
Min: 12°
Max: 24°
The next few hours will be partly cloudy, with tomorrow reaching 23°C and dropping to 11°C. The coming days will be mostly cloudy
Compare today's weather with yesterday's data and track temperature trends over time.
Hourly Forecast
Daylight Hours
07:42
Sunrise
19:43
Sunset
Moon
Waxing Gibbous
17:22
Moonrise
01:14
Moonset
Daily Forecast
Today
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
Monday
Tuesday
Air Quality Data Available
Upgrade to access real-time air quality data for Grigny.
Resources
UV Index
Humidity
Current stargazing conditions?
See sky darkness, moon phase, and the best viewing window for Grigny.
View stargazing scoreWeather in Grigny tomorrow, September 21, 2026
Grigny starts September 21, 2026 under largely sunny skies, with bright spells setting the tone from the outset. Outdoor plans should enjoy long stretches of open sky as the day unfolds. Cloud leads the morning, peaking close to 100% near 04:00. Sunshine has little room until later in the day.
The temperature range runs from about 12°C up to 23°C. Expect humidity between 34% and 92%, most humid near 08:00. Winds stay light, near 3.2 km/h by 17:00, so the day feels still more than breezy.
Expect persistent cloud later on, with amounts around 88% by 12:00. Sunshine remains the exception, not the rule. Visibility stays generally good near 34.2 km on average, though it can drop toward 19.2 km in thicker cloud or showers. The sun rises at 07:43 and sets at 19:41, for a total of 11 hours 58 minutes of sunlight today.
Overall, Grigny on September 21, 2026 favours outdoor plans under mostly open skies, with a comfortable high near 23°C.
Frequently asked questions about weather in Grigny
How warm does it get in Grigny?
The warmest month in Grigny is July, with average high temperatures of 26°C. The average temperature during this period is around 21°C.
How cold does it get in Grigny?
The coldest month in Grigny 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 Grigny?
The wettest month in Grigny is October, with an average of 82mm of precipitation.
What is the driest time of year in Grigny?
The driest month in Grigny is April, with an average of 51mm of precipitation.
Explore more weather forecasts
- Ris-Orangis, Île-de-France
- Paris, Île-de-France
- Viry-Châtillon, Île-de-France
- Marseille, Provence-Alpes-Côte d'Azur
- Morsang-sur-Orge, Île-de-France
- Lyon, Auvergne-Rhône-Alpes
- Juvisy-sur-Orge, Île-de-France
- Toulouse, Occitanie
- Draveil, Île-de-France
- Nice, Provence-Alpes-Côte d'Azur
- Savigny-sur-Orge, Île-de-France
- Nantes, Pays de la Loire
- Évry, Île-de-France
- Marne La Vallée, Île-de-France
- Courcouronnes, Île-de-France
- Strasbourg, Grand Est
