Days 1-14 are a real forecast from global weather models. Days 15-30 are season-typical values based on Météo-France climate normals 1991-2020 — good for planning, NOT an exact forecast that far ahead.
30 days — Grenoble
14 real + 16 synthesised
Tue · Today Clear
+29°+8°3%
Wed · Tomorrow Clear
+31°+10°2%
Thursday 18/6 Showers
+33°+12°1,8 mm
Friday 19/6 Showers
+32°+12°4,7 mm
Saturday 20/6 Clear
+34°+11°1%
Sunday 21/6 Clear
+35°+14°1%
Monday 22/6 Clear
+36°+15°1%
Tuesday 23/6 Clear
+35°+15°2%
Wednesday 24/6 Clear
+35°+16°17%
Thursday 25/6 Clear
+36°+14°17%
Friday 26/6 Partly cloudy
+34°+15°0,2 mm
Saturday 27/6 Partly cloudy
+30°+14°10%
Sunday 28/6 Clear
+32°+12°4%
Monday 29/6 Clear
+34°+14°3%
Tuesday 30/6 Rain (climate normal)
+25°+14°6,7 mm
Wednesday 1/7 Partly cloudy (climate normal)
+30°+17°20%
Thursday 2/7 Partly cloudy (climate normal)
+30°+17°20%
Friday 3/7 Rain (climate normal)
+30°+17°8,4 mm
Saturday 4/7 Partly cloudy (climate normal)
+27°+15°20%
Sunday 5/7 Partly cloudy (climate normal)
+25°+14°20%
Monday 6/7 Rain (climate normal)
+26°+15°7,7 mm
Tuesday 7/7 Partly cloudy (climate normal)
+28°+16°20%
Wednesday 8/7 Partly cloudy (climate normal)
+31°+18°20%
Thursday 9/7 Rain (climate normal)
+30°+17°5,1 mm
Friday 10/7 Partly cloudy (climate normal)
+29°+17°20%
Saturday 11/7 Partly cloudy (climate normal)
+28°+16°20%
Sunday 12/7 Rain (climate normal)
+25°+14°8,9 mm
Monday 13/7 Partly cloudy (climate normal)
+27°+16°20%
Tuesday 14/7 Partly cloudy (climate normal)
+27°+15°20%
Wednesday 15/7 Rain (climate normal)
+29°+17°7,9 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 Météo-France climate normals 1991-2020 directly for Grenoble, with mild weekly variation.
Use: "Roughly how warm is it usually in Paris in the last week of July?" — a good question for days 15-30. "Will it rain on 27 May?" — no serious forecast can say.
Official weather data from Météo-France (French Meteorological and Hydrological Institute) · Météo-France · French Museum of Natural History · Bison Futé