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 — Mannheim
14 real + 16 synthesised
Mon · Today Clear
+36°+22°3%
Tue · Tomorrow Clear
+34°+21°2%
Wednesday 24/6 Clear
+37°+23°2%
Thursday 25/6 Clear
+37°+24°2%
Friday 26/6 Clear
+38°+23°1%
Saturday 27/6 Clear
+38°+24°1%
Sunday 28/6 Clear
+38°+25°2%
Monday 29/6 Showers
+32°+22°3,1 mm
Tuesday 30/6 Showers
+21°+15°0,9 mm
Wednesday 1/7 Partly cloudy
+27°+15°0,2 mm
Thursday 2/7 Partly cloudy
+30°+16°4%
Friday 3/7 Showers
+33°+20°1,1 mm
Saturday 4/7 Showers
+31°+19°0,7 mm
Sunday 5/7 Clear
+33°+20°3%
Monday 6/7 Heavy rain
+26°+16°1,3 mm
Tuesday 7/7 Showers
+25°+15°1,9 mm
Wednesday 8/7 Partly cloudy (climate normal)
+29°+17°20%
Thursday 9/7 Rain (climate normal)
+27°+16°7,0 mm
Friday 10/7 Partly cloudy (climate normal)
+24°+14°20%
Saturday 11/7 Partly cloudy (climate normal)
+22°+13°20%
Sunday 12/7 Rain (climate normal)
+24°+14°8,6 mm
Monday 13/7 Partly cloudy (climate normal)
+25°+15°20%
Tuesday 14/7 Partly cloudy (climate normal)
+28°+16°20%
Wednesday 15/7 Rain (climate normal)
+27°+16°4,0 mm
Thursday 16/7 Partly cloudy (climate normal)
+26°+15°20%
Friday 17/7 Partly cloudy (climate normal)
+26°+15°20%
Saturday 18/7 Rain (climate normal)
+23°+13°4,0 mm
Sunday 19/7 Partly cloudy (climate normal)
+23°+13°20%
Monday 20/7 Partly cloudy (climate normal)
+26°+15°20%
Tuesday 21/7 Rain (climate normal)
+27°+16°5,3 mm
How does the long-range forecast work?
Days 1-16: Fetched live from global weather models (ECMWF, GFS, ICON) with statistical correction. Reliability ~85% for days 1-3, ~60% for days 7-10, ~45% for days 11-16.
Days 17-30: A real forecast does not exist that far ahead (a chaotic system). Instead we show season-typical values: the month’s average Tmax/Tmin from DWD climate normals 1991-2020 directly for Mannheim, with mild weekly variation.
Use: "Roughly how warm is it usually in Berlin in the last week of July?" — a good question for days 17-30. "Will it rain on 27 May?" — no serious forecast can say.