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 — Jönköping
14 real + 16 synthesised
Wed · Today Showers
+25°+15°3,1 mm
Thu · Tomorrow Showers
+21°+14°0,5 mm
Friday 7/8 Showers
+19°+11°0,9 mm
Saturday 8/8 Showers
+19°+10°0,3 mm
Sunday 9/8 Partly cloudy
+25°+11°6%
Monday 10/8 Showers
+20°+11°1,6 mm
Tuesday 11/8 Clear
+19°+9°4%
Wednesday 12/8 Clear
+21°+10°3%
Thursday 13/8 Partly cloudy
+23°+10°4%
Friday 14/8 Cloudy
+18°+13°18%
Saturday 15/8 Showers
+21°+14°2,9 mm
Sunday 16/8 Partly cloudy
+17°+14°8,7 mm
Monday 17/8 Partly cloudy
+20°+12°0,2 mm
Tuesday 18/8 Partly cloudy
+19°+12°0,2 mm
Wednesday 19/8 Rain (climate normal)
+22°+13°5,7 mm
Thursday 20/8 Partly cloudy (climate normal)
+26°+15°20%
Friday 21/8 Partly cloudy (climate normal)
+25°+14°20%
Saturday 22/8 Rain (climate normal)
+23°+13°7,7 mm
Sunday 23/8 Partly cloudy (climate normal)
+23°+13°20%
Monday 24/8 Partly cloudy (climate normal)
+22°+12°20%
Tuesday 25/8 Rain (climate normal)
+22°+12°7,3 mm
Wednesday 26/8 Partly cloudy (climate normal)
+24°+14°20%
Thursday 27/8 Partly cloudy (climate normal)
+24°+14°20%
Friday 28/8 Rain (climate normal)
+27°+15°5,7 mm
Saturday 29/8 Partly cloudy (climate normal)
+24°+14°20%
Sunday 30/8 Partly cloudy (climate normal)
+23°+13°20%
Monday 31/8 Rain (climate normal)
+21°+12°8,6 mm
Tuesday 1/9 Partly cloudy (climate normal)
+17°+9°20%
Wednesday 2/9 Partly cloudy (climate normal)
+19°+10°20%
Thursday 3/9 Rain (climate normal)
+22°+12°5,7 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 Jönköping), 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.