What is the weather like in Iran in 2026?

Along the southern Caspian shore, weather stays milder and more humid than the plateau, with greener landscapes and more frequent rain, especially toward autumn. That belt suits people who dislike dry desert air, then asks for mould awareness and cooler, damper winters than inland desert towns.

Tehran sits on the southern slopes of the Alborz. Summers are hot and dry; winters turn cold, and the semi-enclosed basin often traps pollution when winds are weak. Northern foothill neighbourhoods can feel a notch fresher than the southern flats, yet the capital still swings hard by season: Living in Tehran.

The central and southeastern plateau trends arid to hyperarid: strong sun, large day-night temperature gaps, and limited rainfall. Southwestern and southern coastal areas lean hot and semi-arid to extreme, with long summers that punish midday outdoor work. Northwestern highland towns run colder in winter than the Gulf coast. Isfahan and Shiraz sit in drier inland patterns with hot summers and cooler winters than the Caspian strip, still far from European oceanic mildness.

IRIMO (the Iran Meteorological Organization) is the live forecast source once you live here. Before signing a lease, visit in the difficult season for that city: a polluted Tehran winter week, a July midday in the south, or a humid Caspian stretch. Check cooling and heating at the flat, not only the view. Housing costs still track neighbourhood more than climate slogans: Tehran cost of living.

Dust haze can arrive from arid surrounds. Mountain weekends north of Tehran offer cleaner air escapes when the basin feels closed, then traffic returns you to the same valley. Social life shifts indoors during bad air or peak heat: Social life. City shortlist logic: Where to live in Iran and Best climate.