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 — Lillehammer
14 real + 16 synthesised
Mon · Today Clear
+19°+2°3%
Tue · Tomorrow Partly cloudy
+18°+4°1,4 mm
Wednesday 5/8 Fog
+14°+10°8,8 mm
Thursday 6/8 Showers
+14°+6°1,8 mm
Friday 7/8 Showers
+18°+4°1,1 mm
Saturday 8/8 Showers
+18°+7°3,0 mm
Sunday 9/8 Showers
+13°+8°6,2 mm
Monday 10/8 Showers
+17°+7°9,1 mm
Tuesday 11/8 Showers
+19°+6°1,6 mm
Wednesday 12/8 Showers
+19°+6°0,7 mm
Thursday 13/8 Light rain
+11°+7°22,6 mm
Friday 14/8 Showers
+15°+10°7,9 mm
Saturday 15/8 Showers
+15°+8°4,3 mm
Sunday 16/8 Clear
+21°+6°12%
Monday 17/8 Rain (climate normal)
+16°+9°10,7 mm
Tuesday 18/8 Partly cloudy (climate normal)
+21°+12°20%
Wednesday 19/8 Partly cloudy (climate normal)
+21°+12°20%
Thursday 20/8 Rain (climate normal)
+20°+12°10,4 mm
Friday 21/8 Partly cloudy (climate normal)
+17°+10°20%
Saturday 22/8 Partly cloudy (climate normal)
+14°+8°20%
Sunday 23/8 Rain (climate normal)
+15°+9°4,8 mm
Monday 24/8 Partly cloudy (climate normal)
+17°+10°20%
Tuesday 25/8 Partly cloudy (climate normal)
+19°+11°20%
Wednesday 26/8 Rain (climate normal)
+19°+11°4,3 mm
Thursday 27/8 Partly cloudy (climate normal)
+17°+10°20%
Friday 28/8 Partly cloudy (climate normal)
+16°+9°20%
Saturday 29/8 Rain (climate normal)
+14°+8°9,6 mm
Sunday 30/8 Partly cloudy (climate normal)
+16°+10°20%
Monday 31/8 Partly cloudy (climate normal)
+16°+10°20%
Tuesday 1/9 Rain (climate normal)
+15°+7°6,2 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.