Choose a city for the 30-day forecast. Days 1-14 come from global weather models; days 15-30 are synthesised from climate normals 1991-2020 (MET) — season-typical values with weekly variation, NOT an exact forecast that far ahead.
About synthesised forecasts
Climate normals 1991-2020 (MET)
Real weather forecasts have a horizon of about 14 days — beyond that the uncertainty becomes larger than the variation. For days 15-30 we show season-typical values: the monthly average Tmax and Tmin from climate normals 1991-2020, adjusted for the location latitude and with a mild weekly variation. Good for planning, but NOT an exact forecast for a specific day.