Best time to visit Iran

Iran in this dataset covers 6 cities with distinct NASA POWER grid cells (plus nearby cities that share a cell). Annual rainfall among those cities runs from 164 mm in Isfahan to 509 mm in Karaj. The monthly-average temperature swing is 23.2–26.4°C depending on the city.

Iran is not one climate: the cities here include a dry, semi-arid climate; a continental climate with a wide temperature swing.

Regional contrasts in Iran

The hottest peak in the sample is Tehran in July (30.6°C). The coldest monthly average is Karaj in January (-5.7°C). Karaj takes the most rain (509 mm a year, wettest in November); Isfahan takes the least (164 mm).

Warmest-month averages in the set range from 20.6°C to 30.6°C. Use the city pages for the month-by-month table; this page is the contrast between places.

Best months by region

Drier cities: typical hottest-month average 26.3°C and about 175 mm of rain a year. Best-scoring months — Isfahan (May, September, and October); Mashhad (June, July, and August).

In-between rainfall: typical hottest-month average 26.1°C and about 255 mm of rain a year. Best-scoring months — Tabriz (June, July, and August); Shiraz (May, September, and October).

Wetter cities: typical hottest-month average 25.6°C and about 410 mm of rain a year. Best-scoring months — Tehran (May, June, and September); Karaj (June, July, and August).

Isfahan in Iran

Isfahan sits at 32.65°, 51.67°. It is a dry, semi-arid climate. July is the warmest month at 28.8°C (high 37.5°C); January is the coolest at 3.8°C (low -2.6°C). The gap between those monthly averages is 25.0°C.

The year is dry: only 164 mm, with March the least-dry month at 28 mm. The three highest-scoring months for a visit are May, September, and October. That ranking uses the same 22°C / low-rain / 60% humidity score as the city pages. Population in the GeoNames record is 1,547,164. The wettest month is March (28 mm, 5 days with at least 1 mm); the driest is August (1 mm).

Karaj in Iran

Karaj sits at 35.83°, 50.99°. It is a continental climate with a wide temperature swing. July is the warmest month at 20.6°C (high 27.0°C); January is the coolest at -5.7°C (low -10.4°C). The gap between those monthly averages is 26.3°C.

The wet season runs from October to November. The three highest-scoring months for a visit are June, July, and August. That ranking uses the same 22°C / low-rain / 60% humidity score as the city pages. Population in the GeoNames record is 1,448,075. The wettest month is November (80 mm, 11 days with at least 1 mm); the driest is June (12 mm).

Mashhad in Iran

Mashhad sits at 36.30°, 59.61°. It is a dry, semi-arid climate. July is the warmest month at 23.7°C (high 31.4°C); January is the coolest at 0.5°C (low -5.0°C). The gap between those monthly averages is 23.2°C.

The year is dry: only 186 mm, with March the least-dry month at 42 mm. The three highest-scoring months for a visit are June, July, and August. That ranking uses the same 22°C / low-rain / 60% humidity score as the city pages. Population in the GeoNames record is 2,307,177. The wettest month is March (42 mm, 8 days with at least 1 mm); the driest is August (1 mm).

Shiraz in Iran

Shiraz sits at 29.61°, 52.53°. It is a continental climate with a wide temperature swing. July is the warmest month at 29.0°C (high 38.0°C); January is the coolest at 5.4°C (low -0.9°C). The gap between those monthly averages is 23.6°C.

The wet season runs from December to January. The three highest-scoring months for a visit are May, September, and October. That ranking uses the same 22°C / low-rain / 60% humidity score as the city pages. Population in the GeoNames record is 1,249,942. The wettest month is January (53 mm, 6 days with at least 1 mm); the driest is September (1 mm).

Tabriz in Iran

Tabriz sits at 38.08°, 46.29°. It is a dry, semi-arid climate. July is the warmest month at 23.2°C (high 32.0°C); January is the coolest at -2.9°C (low -7.3°C). The gap between those monthly averages is 26.1°C.

The year is dry: only 236 mm, with April the least-dry month at 44 mm. The three highest-scoring months for a visit are June, July, and August. That ranking uses the same 22°C / low-rain / 60% humidity score as the city pages. Population in the GeoNames record is 1,424,641. The wettest month is April (44 mm, 9 days with at least 1 mm); the driest is August (4 mm).

Tehran in Iran

Tehran sits at 35.69°, 51.42°. It is a continental climate with a wide temperature swing. July is the warmest month at 30.6°C (high 37.7°C); January is the coolest at 4.2°C (low -0.9°C). The gap between those monthly averages is 26.4°C.

Rainfall totals 311 mm, heaviest in November (45 mm) and lightest in June (6 mm). The three highest-scoring months for a visit are May, June, and September. That ranking uses the same 22°C / low-rain / 60% humidity score as the city pages. Population in the GeoNames record is 7,153,309. The wettest month is November (45 mm, 9 days with at least 1 mm); the driest is June (6 mm).