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15-day forecast for Monthey

Right now

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From 27 Sep to 12 Oct in Monthey: 1 day(s) of clear skies expected, highs from 7 to 21 °C and 89.4 mm of precipitation in total. Day-by-day table (Open-Meteo model).

DayWeatherMinMaxPrecip.WindConfidence
Todaypartly cloudy12 °C21 °C0.0 mm10 km/hhigh
Tomorrowovercast12 °C21 °C0.0 mm6 km/hhigh
Tue 29 Sepshowers12 °C19 °C0.7 mm7 km/hmedium
Wed 30 Seplight rain13 °C16 °C4.2 mm6 km/hmedium
Thu 1 Octshowers10 °C14 °C11.6 mm5 km/hmedium
Fri 2 Octfog9 °C14 °C0.0 mm7 km/hmedium
Sat 3 Octthunderstorms8 °C15 °C3.9 mm6 km/hmedium
DayWeatherMinMaxPrecip.WindConfidence
Sun 4 Octshowers8 °C14 °C27.6 mm8 km/h
Mon 5 Octshowers5 °C9 °C24.6 mm6 km/h
Tue 6 Octlight drizzle2 °C8 °C1.8 mm10 km/h
Wed 7 Octpartly cloudy1 °C10 °C0.0 mm5 km/h
Thu 8 Octlight drizzle2 °C10 °C1.8 mm8 km/h
Fri 9 Octlight drizzle3 °C11 °C1.2 mm7 km/h
Sat 10 Octdrizzle2 °C7 °C5.4 mm11 km/h
Sun 11 Octsnow showers2 °C10 °C6.6 mm9 km/h
Mon 12 Octovercast– °C– °C– mm– km/h

Confidence index: agreement of 4 independent models (ICON, GFS, IFS, ARPEGE) on the daily high and on rain. High = highs within 2 °C and the same rain verdict; low = more than 4 °C apart or models split on rain.

And at 20, 25 or 30 days? No model seriously forecasts that far: beyond two weeks, only the local climatology gives a reliable trend.

Frequently asked questions

Are these 15-day forecasts reliable?

Reliability decreases with the horizon: excellent at 3 days, good up to 7, indicative beyond 10. Each passing day sharpens the rest.

Can the weather be forecast a month ahead?

No, not day by day. That is why this page completes the 16 forecast days with the MeteoSwiss monthly norms for Monthey: the most honest estimate beyond two weeks.

meteo-ch.ch · Open-Meteo data, MeteoSwiss norms 1991–2020