Days 1-14 are a real forecast from global weather models. Days 15-30 are season-typical values based on climate normals 1991-2020 (MET) — good for planning, NOT an exact forecast that far ahead.
30 days — Stavanger
14 real + 16 synthesised
Fri · Today Showers
+16°+13°8,9 mm
Sat · Tomorrow Showers
+15°+14°16,8 mm
Sunday 6/9 Showers
+15°+13°4,0 mm
Monday 7/9 Cloudy
+18°+14°12,0 mm
Tuesday 8/9 Showers
+15°+12°16,3 mm
Wednesday 9/9 Showers
+14°+13°12,8 mm
Thursday 10/9 Showers
+14°+13°5,1 mm
Friday 11/9 Showers
+15°+11°5,6 mm
Saturday 12/9 Showers
+14°+13°0,8 mm
Sunday 13/9 Cloudy
+14°+13°17%
Monday 14/9 Cloudy
+15°+12°23,4 mm
Tuesday 15/9 Showers
+15°+13°2,1 mm
Wednesday 16/9 Showers
+15°+11°12,4 mm
Thursday 17/9 Showers
+15°+12°2,2 mm
Friday 18/9 Rain (climate normal)
+14°+10°14,0 mm
Saturday 19/9 Partly cloudy (climate normal)
+17°+11°20%
Sunday 20/9 Partly cloudy (climate normal)
+17°+11°20%
Monday 21/9 Rain (climate normal)
+16°+10°10,1 mm
Tuesday 22/9 Partly cloudy (climate normal)
+15°+10°20%
Wednesday 23/9 Partly cloudy (climate normal)
+14°+9°20%
Thursday 24/9 Rain (climate normal)
+14°+10°22,4 mm
Friday 25/9 Partly cloudy (climate normal)
+15°+10°20%
Saturday 26/9 Partly cloudy (climate normal)
+17°+11°20%
Sunday 27/9 Rain (climate normal)
+17°+11°18,5 mm
Monday 28/9 Partly cloudy (climate normal)
+17°+11°20%
Tuesday 29/9 Partly cloudy (climate normal)
+13°+9°20%
Wednesday 30/9 Rain (climate normal)
+12°+8°17,4 mm
Thursday 1/10 Partly cloudy (climate normal)
+10°+6°20%
Friday 2/10 Partly cloudy (climate normal)
+13°+8°20%
Saturday 3/10 Rain (climate normal)
+15°+9°11,6 mm
How does the long-range forecast work?
Days 1-14: Fetched live from global weather models (ECMWF, GFS) with statistical correction. Reliability about 85 % for days 1-3, about 60 % for days 7-10, about 45 % for days 11-14.
Days 15-30: A real forecast does not exist that far ahead (chaotic system). Instead we show season-typical values: the monthly average Tmax/Tmin from climate normals 1991-2020, with mild weekly variation.
Use: «About how warm is it usually in Oslo the last week of July?» — a good question for days 15-30. «Will it rain on 27 May?» — no serious forecast can answer that.