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