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
08:15
Sunrise
19:40
Sunset
Moon
Waning Gibbous
21:12
Moonrise
13:05
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-Cast-le-Guildo.
Resources
UV Index
Humidity
Current stargazing conditions?
See sky darkness, moon phase, and the best viewing window for Saint-Cast-le-Guildo.
View stargazing scoreWeather in Saint-Cast-le-Guildo today, September 30, 2026
Expect a muted, overcast feel in Saint-Cast-le-Guildo on September 30, 2026 as cloud persists. Brighter breaks, if they arrive, should stay brief. Cloud leads the morning, peaking close to 100% near 03:00. Sunshine has little room until later in the day.
Temperatures climb from an overnight low near 16°C toward a daytime high of about 22°C. Expect humidity between 54% and 86%, most humid near 23:00. A lighter breeze peaks around 15:00 near 6.1 km/h.
The afternoon keeps an overcast feel, as cloud reaches about 100% around 12:00. Outdoor plans may still want a flexible backup. Expect visibility near 34.4 km, with poorer spells close to 26.2 km. Daylight runs from 08:15 to 19:40, lasting 11 hours 25 minutes of sunlight today.
Taken together, overcast skies in Saint-Cast-le-Guildo on September 30, 2026 favour indoor or covered options, with temperatures near 22°C.
Frequently asked questions about weather in Saint-Cast-le-Guildo
How warm does it get in Saint-Cast-le-Guildo?
The warmest month in Saint-Cast-le-Guildo is August, with average high temperatures of 19°C. The average temperature during this period is around 18°C.
How cold does it get in Saint-Cast-le-Guildo?
The coldest month in Saint-Cast-le-Guildo is January, with average low temperatures of 7°C. The average temperature during this period is around 8°C.
What is the wettest time of year in Saint-Cast-le-Guildo?
The wettest month in Saint-Cast-le-Guildo is November, with an average of 127mm of precipitation.
What is the driest time of year in Saint-Cast-le-Guildo?
The driest month in Saint-Cast-le-Guildo is July, with an average of 45mm of precipitation.
Explore more weather forecasts
- Dinard, Bretagne
- Paris, Île-de-France
- Saint-Malo, Bretagne
- Marseille, Provence-Alpes-Côte d'Azur
- Dinan, Bretagne
- Lyon, Auvergne-Rhône-Alpes
- Lamballe, Bretagne
- Toulouse, Occitanie
- Plérin, Bretagne
- Nice, Provence-Alpes-Côte d'Azur
- Saint-Brieuc, Bretagne
- Nantes, Pays de la Loire
- Ploufragan, Bretagne
- Marne La Vallée, Île-de-France
- Loudéac, Bretagne
- Strasbourg, Grand Est
