Days 1-14 are a real forecast from global weather models. Days 15-30 are season-typical values based on SMHI climate normals 1991-2020 — good for planning, NOT an exact forecast that far ahead.
30 days — Norrköping
14 real + 16 synthesised
Thu · Today Clear
+32°+16°4%
Fri · Tomorrow Clear
+23°+13°4,0 mm
Saturday 1/8 Clear
+22°+10°3%
Sunday 2/8 Partly cloudy
+21°+11°5%
Monday 3/8 Clear
+22°+10°3%
Tuesday 4/8 Clear
+24°+12°3%
Wednesday 5/8 Partly cloudy
+22°+13°8%
Thursday 6/8 Clear
+23°+13°1,9 mm
Friday 7/8 Partly cloudy
+24°+11°11,2 mm
Saturday 8/8 Fog
+16°+13°5,5 mm
Sunday 9/8 Partly cloudy
+21°+12°0,9 mm
Monday 10/8 Partly cloudy
+19°+10°4%
Tuesday 11/8 Partly cloudy
+18°+8°5%
Wednesday 12/8 Partly cloudy
+21°+10°3,6 mm
Thursday 13/8 Rain (climate normal)
+22°+12°6,6 mm
Friday 14/8 Partly cloudy (climate normal)
+25°+14°20%
Saturday 15/8 Partly cloudy (climate normal)
+24°+14°20%
Sunday 16/8 Rain (climate normal)
+23°+13°3,5 mm
Monday 17/8 Partly cloudy (climate normal)
+21°+12°20%
Tuesday 18/8 Partly cloudy (climate normal)
+22°+12°20%
Wednesday 19/8 Rain (climate normal)
+20°+11°7,3 mm
Thursday 20/8 Partly cloudy (climate normal)
+22°+12°20%
Friday 21/8 Partly cloudy (climate normal)
+24°+14°20%
Saturday 22/8 Rain (climate normal)
+26°+15°8,6 mm
Sunday 23/8 Partly cloudy (climate normal)
+25°+14°20%
Monday 24/8 Partly cloudy (climate normal)
+22°+12°20%
Tuesday 25/8 Rain (climate normal)
+19°+11°4,6 mm
Wednesday 26/8 Partly cloudy (climate normal)
+21°+11°20%
Thursday 27/8 Partly cloudy (climate normal)
+23°+13°20%
Friday 28/8 Rain (climate normal)
+24°+13°7,0 mm
How does the long-range forecast work?
Days 1-14: Fetched live from global weather models (ECMWF, GFS) with statistical correction. Reliability ~85% for days 1-3, ~60% for days 7-10, ~45% for days 11-14.
Days 15-30: 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 SMHI climate normals 1991-2020 (Stockholm baseline with latitude correction for Norrköping), with mild weekly variation.
Use: "Roughly how warm is it usually in Stockholm in the last week of July?" — a good question for days 15-30. "Will it rain on 27 May?" — no serious forecast can say.