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