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 — Metz
14 real + 16 synthesised
Fri · Today Showers
+20°+11°1,8 mm
Sat · Tomorrow Clear
+22°+12°9%
Sunday 14/6 Clear
+22°+9°6%
Monday 15/6 Clear
+21°+7°5%
Tuesday 16/6 Partly cloudy
+24°+6°5%
Wednesday 17/6 Clear
+29°+13°3%
Thursday 18/6 Clear
+33°+15°4%
Friday 19/6 Showers
+31°+18°1,5 mm
Saturday 20/6 Showers
+30°+15°0,6 mm
Sunday 21/6 Showers
+35°+16°0,4 mm
Monday 22/6 Showers
+34°+18°1,2 mm
Tuesday 23/6 Clear
+27°+16°5%
Wednesday 24/6 Clear
+29°+14°3%
Thursday 25/6 Clear
+25°+13°4%
Friday 26/6 Rain (climate normal)
+23°+11°3,5 mm
Saturday 27/6 Partly cloudy (climate normal)
+22°+11°20%
Sunday 28/6 Partly cloudy (climate normal)
+22°+11°20%
Monday 29/6 Rain (climate normal)
+24°+12°5,2 mm
Tuesday 30/6 Partly cloudy (climate normal)
+22°+11°20%
Wednesday 1/7 Partly cloudy (climate normal)
+23°+11°20%
Thursday 2/7 Rain (climate normal)
+23°+12°5,9 mm
Friday 3/7 Partly cloudy (climate normal)
+25°+13°20%
Saturday 4/7 Partly cloudy (climate normal)
+27°+14°20%
Sunday 5/7 Rain (climate normal)
+27°+14°5,7 mm
Monday 6/7 Partly cloudy (climate normal)
+26°+13°20%
Tuesday 7/7 Partly cloudy (climate normal)
+22°+11°20%
Wednesday 8/7 Rain (climate normal)
+22°+11°3,1 mm
Thursday 9/7 Partly cloudy (climate normal)
+24°+12°20%
Friday 10/7 Partly cloudy (climate normal)
+25°+13°20%
Saturday 11/7 Rain (climate normal)
+27°+14°3,9 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 (Paris baseline with latitude correction for Metz), 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