See exactly when rain will start and stop with a minute-by-minute precipitation nowcast for the next hour.
Compare today's weather with yesterday's data and track temperature trends over time.
Hourly Forecast
Daylight Hours
07:41
Sunrise
19:10
Sunset
Moon
Waning Gibbous
20:55
Moonrise
12:15
Moonset
Daily Forecast
Today
Thursday
Friday
Saturday
Sunday
Monday
Tuesday
Wednesday
Thursday
Friday
Air Quality Data Available
Upgrade to access real-time air quality data for Saint-Ismier.
UV Index
Humidity
Current stargazing conditions?
See sky darkness, moon phase, and the best viewing window for Saint-Ismier.
View stargazing scoreWeather in Saint-Ismier today, September 30, 2026
Saint-Ismier 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 first half of the day looks overcast, as cloud amounts reach about 100% around 09:00. Brighter weather, if it comes, waits until later.
The day peaks near 26°C and cools toward 18°C. Moisture in the air spans 29%-63%, with the highest values around 23:00. Winds stay light, near 2.9 km/h by 14:00, so the day feels still more than breezy.
Through the afternoon cloud remains the main feature, with cover near 100% around 15:00. Bright spells should stay limited even as the day wears on. Horizontal visibility sits around 44.3 km, briefly nearer 40.2 km. The sun rises at 07:41 and sets at 19:10, for a total of 11 hours 29 minutes of sunlight today.
In short, treat September 30, 2026 in Saint-Ismier as a damp day: pack covers, watch the wetter hours, and expect a high near 26°C.
Frequently asked questions about weather in Saint-Ismier
How warm does it get in Saint-Ismier?
The warmest month in Saint-Ismier is July, with average high temperatures of 24°C. The average temperature during this period is around 19°C.
How cold does it get in Saint-Ismier?
The coldest month in Saint-Ismier is January, with average low temperatures of -3°C. The average temperature during this period is around 0°C.
What is the wettest time of year in Saint-Ismier?
The wettest month in Saint-Ismier is May, with an average of 175mm of precipitation.
What is the driest time of year in Saint-Ismier?
The driest month in Saint-Ismier is February, with an average of 97mm of precipitation.
Explore more weather forecasts
- Meylan, Auvergne-Rhône-Alpes
- Paris, Île-de-France
- Saint-Martin-d'Hères, Auvergne-Rhône-Alpes
- Marseille, Provence-Alpes-Côte d'Azur
- Saint-Égrève, Auvergne-Rhône-Alpes
- Lyon, Auvergne-Rhône-Alpes
- Grenoble, Auvergne-Rhône-Alpes
- Toulouse, Occitanie
- Fontaine, Auvergne-Rhône-Alpes
- Nice, Provence-Alpes-Côte d'Azur
- Eybens, Auvergne-Rhône-Alpes
- Nantes, Pays de la Loire
- Seyssinet-Pariset, Auvergne-Rhône-Alpes
- Marne La Vallée, Île-de-France
- Sassenage, Auvergne-Rhône-Alpes
- Strasbourg, Grand Est
