See exactly when rain will start and stop with a minute-by-minute precipitation nowcast for the next hour.
10°
Drizzle
Feels Like: 8°
Min: 9°
Max: 14°
The next few hours will be overcast, with today reaching 14°C and dropping to 9°C. The coming days will be mostly clear
Compare today's weather with yesterday's data and track temperature trends over time.
Hourly Forecast
Daylight Hours
07:11
Sunrise
19:09
Sunset
Moon
Waxing Gibbous
17:34
Moonrise
01:36
Moonset
Daily Forecast
Today
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
Monday
Tuesday
Wednesday
Air Quality Data Available
Upgrade to access real-time air quality data for Altenau.
Resources
UV Index
Humidity
Current stargazing conditions?
See sky darkness, moon phase, and the best viewing window for Altenau.
View stargazing scoreWeather in Altenau today, September 21, 2026
Rain features in Altenau on September 21, 2026, so keep waterproofs handy through the day. The damp theme is strongest where shower chances rise. Early hours look the most unsettled, with rain probability near 66% by 09:00. The thickest cloud arrives around 10:00, reaching about 100%.
Temperatures climb from an overnight low near 9°C toward a daytime high of about 14°C. Expect humidity between 59% and 88%, most humid near 23:00. Airflow remains manageable, reaching about 5.1 km/h around 13:00.
Afternoon showers stay in play, peaking near 36% around 21:00. Skies remain cluttered, with cover about 100% by 12:00. Expect visibility near 32.9 km, with poorer spells close to 18.9 km. Expect sunrise at 07:11, sunset at 19:09, and 11 hours 57 minutes of sunlight today overall.
Taken together, Altenau looks wet enough on September 21, 2026 that flexible outdoor plans work best, with temperatures peaking near 14°C.
Frequently asked questions about weather in Altenau
How warm does it get in Altenau?
The warmest month in Altenau is August, with average high temperatures of 23°C. The average temperature during this period is around 18°C.
How cold does it get in Altenau?
The coldest month in Altenau is January, with average low temperatures of -2°C. The average temperature during this period is around 1°C.
What is the wettest time of year in Altenau?
The wettest month in Altenau is January, with an average of 86mm of precipitation.
What is the driest time of year in Altenau?
The driest month in Altenau is April, with an average of 52mm of precipitation.
Explore more weather forecasts
- Clausthal-Zellerfeld, Lower Saxony
- Berlin, Land Berlin
- Goslar, Lower Saxony
- Hamburg, Free and Hanseatic City of Hamburg
- Bad Harzburg, Lower Saxony
- Munich, Bavaria
- Langelsheim, Lower Saxony
- Köln, Nordrhein-Westfalen
- Herzberg am Harz, Lower Saxony
- Frankfurt am Main, Hessen
- Bad Lauterberg im Harz, Lower Saxony
- Stuttgart, Baden-Württemberg
- Seesen, Lower Saxony
- Düsseldorf, Nordrhein-Westfalen
- Bad Gandersheim, Lower Saxony
- Essen, Nordrhein-Westfalen
