Iran weather

When is the best time to visit Iran?

Iran has a hot, dry climate characterized by long, hot, dry summers and short, cool winters. The climate is influenced by Iran’s location between the subtropical aridity of the Arabian desert areas and the subtropical humidity of the eastern Mediterranean area. January is the coldest month, with temperatures from 5°C to 10°C, and August is the hottest month at 20°C to 30°C or more.
Generally the best time to visit Iran is during the Spring and Autumn. March and May in Spring and late September till early November in Autumn are the most popular times for tourists.
You can also choose some regions of the country where have a mild weather during other seasons. For example during winter, west and northwest cities are freezing but if you travel to the southern cities of the country, the lowest temperature you can experience is 12°C .
Iran can be divided in at least four different climate zones, so you don’t have to be so worried about the time you’re gonna travel, cause there will be a destination with a pleasant weather for you in this vast country.

Spring

At March weather becomes better. Temperatures rise to somewhat comfortable range. In coastal areas averages of March are around 17°C, southern regions are bit warmer and in mountainous regions are cooler. 
At April temperatures are nicer. Precipitation decreases and falls mostly at midnight. Water in both Gulfs warm up and since second half of the month weather considered as most comfortable.
At May in flat lands rises to 31 °C and occasional rains are accompanied by thunder.

Summer

In most of the areas, summers are warm to hot with virtually continuous sunshine, but high humidity on the southern coastal areas of the Persian Gulf. Daily Temperatures can be very hot; on some days temperatures can reach easily 40°C or more, especially along the Persian Gulf and Oman Sea which causes a danger of heat exhaustion.
The temperature starts to fall in late September and in mountain regions you can see the first raindrops and that’s where you can say “Fall is here!“

Autumn

It begins to rain from late September, in October the monthly amount of raining is 215 mm. The nip starts from late November and in mountain regions you can see light snowing.
In my opinion Iran has the most pleasant weather in Autumn.

Winter

January is the coldest month and in some cities weather gets freezing, central and southern lands are much warmer and the lowest temperature is 10 -12°C in cities near the Persian gulf. February brings first signs of approaching spring. Temperatures are rising to about 13 °C except alpine regions where air is still cold.

Different cities climate:

As a traveler, I am keen to see a city in the most beautiful time of it, no matter if it is in freezing winter or hot summer.
The below chart shows Iran cities climate, compiled by Weather2Travel. For an explanation to the various measurements.
Take a look to figure out when is the best time for you to pack your bags.

Tabriz

Tehran

Isfahan

Kerman

Shiraz

Yazd

Chabahar

Bushehr

Bandar-e-Abbas