Weather in Isfahan

Rain is a year that totals only 164 mm of rain. The wettest month is March at 28 mm; the driest is August at 1 mm.

Isfahan is in Iran at 32.7°N. The 2001–2020 NASA POWER daily record describes a dry, semi-arid climate. July is the warmest month (average 28.8°C, high 37.5°C) and January is the coolest (average 3.8°C, low -2.6°C). On this site the months that score closest to a 22°C day, lighter rain, and moderate humidity are May, September, and October.

Hot and cool months in Isfahan

Monthly average highs run from 10.2°C in January to 37.5°C in July. Nights follow the same curve: -2.6°C in January and 20.1°C in July.

Across the year the mean afternoon high is 24.1°C. If you want the smallest day–night shock, look at months where the high and low sit close together; July nights still hold 20.1°C.

When Isfahan gets wet

Isfahan is dry. The whole year adds up to 164 mm. March is the “wet” month at 28 mm; August drops to 1 mm.

Humidity peaks near 59%. That usually lines up with the wetter months rather than the hottest ones.

Distinctive months in Isfahan

The year bottoms out in January. Plan for -2.6°C at night and 10.2°C in the afternoon. February stands apart from the months beside it: 12.9°C / -1.6°C and 20 mm. March is the wettest month — 28 mm and 5 rainy days, with 49% humidity. In April, Isfahan averages 22.9°C by day and 6.9°C at night, with 25 mm of rain. May: 29.3°C high, 12.5°C low, 10 mm rain, 33% humidity. June stands apart from the months beside it: 35.4°C / 17.4°C and 2 mm.

Peak heat arrives in July: 37.5°C by day, 20.1°C at night, and 17% humidity. August is the driest month, averaging only 1 mm across 0 rainy days. Highs sit near 36.0°C. September: 32.2°C high, 15.3°C low, 1 mm rain, 19% humidity. October brings 4 mm and 1 rainy days; temperatures run from 10.2°C to 25.6°C. November stands apart from the months beside it: 16.8°C / 2.8°C and 24 mm. December: 11.9°C high, -1.2°C low, 26 mm rain, 58% humidity.

When the score favours a visit

The three months with the highest comfort score are May, September, and October: May (20.9°C average, 10 mm, 33% humidity); September (23.8°C average, 1 mm, 19% humidity); October (17.9°C average, 4 mm, 29% humidity). They fall in calendar order. The score rewards averages near 22°C, lower rainfall, and humidity near 60%. It is a climate score, not a festival or price calendar.

If you prefer the hottest stretch, that is July. The coolest stretch is January.

Isfahan and other cities in Iran

Tehran is about 339 km away: Isfahan is 1.8°C cooler than Tehran in its hottest month and 146 mm drier over the year than Tehran. Tehran’s wettest month is November (45 mm) versus March here.

Shiraz is about 348 km away: Isfahan is about as warm as Shiraz at the hot peak and 109 mm drier over the year than Shiraz. Shiraz’s wettest month is January (53 mm) versus March here.

Karaj is about 359 km away: Isfahan is 8.2°C warmer than Karaj in its hottest month and 345 mm drier over the year than Karaj. Karaj’s wettest month is November (80 mm) versus March here.