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