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