Days 1-16 are a real forecast from global weather models. Days 17-30 are season-typical values based on DWD climate normals 1991-2020 — good for planning, NOT an exact forecast that far ahead.
30 days — Aachen
14 real + 16 synthesised
Tue · Today Partly cloudy
+33°+19°0,7 mm
Wed · Tomorrow Clear
+31°+17°3%
Thursday 6/8 Clear
+26°+11°2%
Friday 7/8 Clear
+25°+10°3%
Saturday 8/8 Clear
+30°+11°1%
Sunday 9/8 Clear
+30°+13°1%
Monday 10/8 Clear
+32°+13°2%
Tuesday 11/8 Showers
+32°+17°1,7 mm
Wednesday 12/8 Clear
+33°+18°9,1 mm
Thursday 13/8 Partly cloudy
+28°+15°14,0 mm
Friday 14/8 Showers
+16°+11°7,4 mm
Saturday 15/8 Showers
+16°+13°12,3 mm
Sunday 16/8 Showers
+19°+11°0,4 mm
Monday 17/8 Clear
+25°+12°5%
Tuesday 18/8 Showers
+23°+14°4,1 mm
Wednesday 19/8 Heavy rain
+23°+14°1,1 mm
Thursday 20/8 Partly cloudy (climate normal)
+26°+14°20%
Friday 21/8 Rain (climate normal)
+25°+13°9,3 mm
Saturday 22/8 Partly cloudy (climate normal)
+23°+12°20%
Sunday 23/8 Partly cloudy (climate normal)
+22°+11°20%
Monday 24/8 Rain (climate normal)
+22°+11°10,1 mm
Tuesday 25/8 Partly cloudy (climate normal)
+22°+11°20%
Wednesday 26/8 Partly cloudy (climate normal)
+26°+14°20%
Thursday 27/8 Rain (climate normal)
+25°+13°9,3 mm
Friday 28/8 Partly cloudy (climate normal)
+23°+12°20%
Saturday 29/8 Partly cloudy (climate normal)
+21°+11°20%
Sunday 30/8 Rain (climate normal)
+21°+11°6,9 mm
Monday 31/8 Partly cloudy (climate normal)
+20°+10°20%
Tuesday 1/9 Partly cloudy (climate normal)
+18°+9°20%
Wednesday 2/9 Rain (climate normal)
+20°+9°6,8 mm
Long-range forecast · Aachen
Aachen — 30-day analysis
Across the 30-day trend for Aachen, highs and lows span 9° to 33°, cooling down later in the month. The first 16 days are a real forecast, with rain on about 7 of them; the rest is based on the 1991–2020 climate normals.
How does the long-range forecast work?
Days 1-16 are a real forecast from global models (ICON, ECMWF, GFS): days 1-3 are almost always right, uncertainty grows afterwards, and from day 11 these are tendencies rather than exact values.
From day 17 a serious day-by-day forecast is physically impossible. We therefore show the 1991-2020 climate normals (monthly mean Tmax/Tmin) directly for Aachen, with mild weekly variation — the typical weather for the season, not a daily prediction.
Rule of thumb: good for “how warm is it usually in late July?”, not for “will it rain on the 27th?”.