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Hourly Forecast
Daylight Hours
07:26
Sunrise
19:24
Sunset
Moon
Waxing Gibbous
17:37
Moonrise
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View stargazing scoreWeather in Saarlouis today, September 21, 2026
Saarlouis could see fog on September 21, 2026, so early travel may need extra care. Visibility is the main watchpoint while the air stays still.
The day peaks near 19°C and cools toward 7°C. Expect humidity between 51% and 79%, most humid near 23:00. Winds stay light, near 2.6 km/h by 18:00, so the day feels still more than breezy.
The afternoon keeps an overcast feel, as cloud reaches about 100% around 16:00. Outdoor plans may still want a flexible backup. Expect visibility near 39.2 km, with poorer spells close to 35.5 km. Sunrise is at 07:26 and sunset at 19:24, giving 11 hours 58 minutes of sunlight today.
Overall, Saarlouis on September 21, 2026 needs patience with visibility, especially early, even as temperatures reach about 19°C.
Frequently asked questions about weather in Saarlouis
How warm does it get in Saarlouis?
The warmest month in Saarlouis is August, with average high temperatures of 25°C. The average temperature during this period is around 20°C.
How cold does it get in Saarlouis?
The coldest month in Saarlouis is January, with average low temperatures of 0°C. The average temperature during this period is around 3°C.
What is the wettest time of year in Saarlouis?
The wettest month in Saarlouis is January, with an average of 108mm of precipitation.
What is the driest time of year in Saarlouis?
The driest month in Saarlouis is August, with an average of 55mm of precipitation.
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