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