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 — Hamburg
14 real + 16 synthesised
Sat · Today Rain
+29°+17°10,4 mm
Sun · Tomorrow Clear
+25°+14°7%
Monday 22/6 Clear
+24°+12°5%
Tuesday 23/6 Clear
+27°+12°3%
Wednesday 24/6 Clear
+30°+14°4%
Thursday 25/6 Clear
+21°+11°5%
Friday 26/6 Clear
+25°+10°8%
Saturday 27/6 Clear
+25°+11°4%
Sunday 28/6 Showers
+23°+13°1,2 mm
Monday 29/6 Showers
+22°+13°0,6 mm
Tuesday 30/6 Partly cloudy
+22°+9°9%
Wednesday 1/7 Showers
+16°+13°2,2 mm
Thursday 2/7 Partly cloudy
+20°+12°0,3 mm
Friday 3/7 Showers
+20°+10°1,5 mm
Saturday 4/7 Showers
+22°+13°1,7 mm
Sunday 5/7 Showers
+22°+14°3,7 mm
Monday 6/7 Partly cloudy (climate normal)
+24°+14°20%
Tuesday 7/7 Rain (climate normal)
+23°+13°5,8 mm
Wednesday 8/7 Partly cloudy (climate normal)
+23°+13°20%
Thursday 9/7 Partly cloudy (climate normal)
+22°+12°20%
Friday 10/7 Rain (climate normal)
+21°+12°5,5 mm
Saturday 11/7 Partly cloudy (climate normal)
+23°+13°20%
Sunday 12/7 Partly cloudy (climate normal)
+24°+13°20%
Monday 13/7 Rain (climate normal)
+27°+15°5,3 mm
Tuesday 14/7 Partly cloudy (climate normal)
+24°+13°20%
Wednesday 15/7 Partly cloudy (climate normal)
+23°+13°20%
Thursday 16/7 Rain (climate normal)
+21°+12°4,2 mm
Friday 17/7 Partly cloudy (climate normal)
+20°+11°20%
Saturday 18/7 Partly cloudy (climate normal)
+23°+13°20%
Sunday 19/7 Rain (climate normal)
+24°+14°8,2 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 Hamburg, 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.