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