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 — Le Mans
14 real + 16 synthesised
Tue · Today Partly cloudy
+27°+15°5%
Wed · Tomorrow Clear
+31°+14°3%
Thursday 18/6 Clear
+35°+15°4%
Friday 19/6 Showers
+36°+18°0,3 mm
Saturday 20/6 Clear
+36°+17°4%
Sunday 21/6 Partly cloudy
+39°+22°0,2 mm
Monday 22/6 Clear
+36°+18°2%
Tuesday 23/6 Clear
+31°+17°1%
Wednesday 24/6 Clear
+31°+13°1%
Thursday 25/6 Clear
+32°+13°1%
Friday 26/6 Clear
+33°+14°1%
Saturday 27/6 Clear
+36°+15°0%
Sunday 28/6 Clear
+40°+18°1%
Monday 29/6 Clear
+42°+21°1%
Tuesday 30/6 Rain (climate normal)
+23°+12°8,0 mm
Wednesday 1/7 Partly cloudy (climate normal)
+27°+14°20%
Thursday 2/7 Partly cloudy (climate normal)
+29°+16°20%
Friday 3/7 Rain (climate normal)
+28°+15°4,2 mm
Saturday 4/7 Partly cloudy (climate normal)
+25°+13°20%
Sunday 5/7 Partly cloudy (climate normal)
+22°+11°20%
Monday 6/7 Rain (climate normal)
+23°+12°4,2 mm
Tuesday 7/7 Partly cloudy (climate normal)
+25°+13°20%
Wednesday 8/7 Partly cloudy (climate normal)
+29°+16°20%
Thursday 9/7 Rain (climate normal)
+29°+16°6,2 mm
Friday 10/7 Partly cloudy (climate normal)
+28°+15°20%
Saturday 11/7 Partly cloudy (climate normal)
+26°+14°20%
Sunday 12/7 Rain (climate normal)
+25°+13°3,1 mm
Monday 13/7 Partly cloudy (climate normal)
+23°+12°20%
Tuesday 14/7 Partly cloudy (climate normal)
+25°+13°20%
Wednesday 15/7 Rain (climate normal)
+29°+16°2,8 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 (Paris baseline with latitude correction for Le Mans), 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