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