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