October
Best time
23.8°C / 13.3°C
7 rain days
warm
- comfortable temperatures (avg high 23.8°C / 75°F)
- manageable rain (7 days)
Best time to visit Tehran
Tehran, Iran — ranked month by month from data: temperature, rainfall, snow, and peak hazard seasons. The standouts: October, April, May.
Best · October & April
About Tehran
Tehran is the capital and largest city of Iran. It is also the capital of Tehran province and the administrative center for Tehran County and its Central District. With a population of around 9 million in the city, and 16.8 million in the metropolitan area, Tehran is the most populous city in Iran and West Asia, the largest metropolitan area in the Middle East and the 24th-most-populous metropolitan area in the world.
— condensed from Wikipedia
Best months to visit
April
Best time
22.8°C / 10.7°C
13 rain days
warm, rainy
- comfortable temperatures (avg high 22.8°C / 73°F)
May
Best time
29.5°C / 16.8°C
10 rain days
hot, rainy
- manageable rain (10 days)
- warm evenings without humidity overload
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OK — shoulder months
September
OK
31.9°C / 20.2°C
2 rain days
hot, dry
- very low rainfall (only 2 rain days)
- warm evenings without humidity overload
March
OK
16.7°C / 5.6°C
16 rain days
mild, very wet
November
OK
14.6°C / 5.4°C
11 rain days
cool, rainy
December
OK
10.4°C / 1.2°C
9 rain days
cool
- manageable rain (9 days)
February
OK
11.3°C / 0.6°C
11 rain days
cool, rainy
January
OK
8.5°C / -1°C
11 rain days
chilly, freezing nights, rainy
Months to skip
August
Skip
35.7°C / 23.9°C
1 rain days
hot, dry
- dangerously hot (avg high 35.7°C)
June
Skip
35.6°C / 22.7°C
2 rain days
hot, dry
- dangerously hot (avg high 35.6°C)
July
Skip
37.4°C / 25.7°C
2 rain days
hot, dry
- dangerously hot (avg high 37.4°C)
How we ranked these
Each month is scored on temperature comfort (18–27°C avg high is the sweet spot), rainfall (more rain days = lower score), snow days, and peak hazard seasons (hurricanes, monsoons, etc.). Green-tier months are within ideal range with no major issues. Yellow are workable but with trade-offs. Red has at least one significant problem — extreme heat or cold, heavy rain, or peak storm season.