Tehran climate

Name: Tehran
Address: IR

Tehran is warmest in July, with average highs of 36 °C, and coldest in January, when nights average -5.0 °C. March is the wettest month (61 mm) and July the driest (4.0 mm). Figures are 1991–2020 climate normals.

Across a full year Tehran averages 346 mm of rain, 156 days above 25 °C and 87 days below freezing.

Iran · population 7,153,309 · 1991–2020 normals

Temperature below 0 °C to above 30 °C Rain band height is that month’s share of the wettest month

Warmest month July 36 °C
Coldest month January -5.0 °C
Driest month July 4 mm
Wettest month March 61 mm
Least cloud September 8 % cloud
Hottest on record July 42 °C
Coldest on record January -23 °C

What to expectTehran through the year

Tehran has a clear annual cycle: average daily highs run from 5.7 °C in January to 36 °C in July, a swing of 31 °C in mean temperature across the year.

Counted across a normal year, 156 days a year reach 25 °C, 111 of them reach 30 °C, 87 nights drop below freezing. The warmest reading in the 1991–2020 record is 42 °C, in July.

Rain is strongly seasonal. March averages 61 mm against 4 mm in July — 15 times as much. Planning around the dry months matters more here than planning around temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	5.7 °C	41 mm	41 %
February	7.8 °C	47 mm	42 %
March	13.6 °C	61 mm	44 %
April	20.3 °C	48 mm	45 %
May	26.9 °C	21 mm	35 %
June	33.1 °C	6 mm	15 %
July	35.8 °C	4 mm	12 %
August	34.8 °C	4 mm	9 %
September	30.1 °C	4 mm	8 %
October	22.8 °C	21 mm	25 %
November	13.6 °C	46 mm	40 %
December	7.9 °C	43 mm	42 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C	Days below 0 °C
January	5.7 °C	-5.0 °C	0.2 °C	15.6 °C	-22.7 °C	0	0	27
February	7.8 °C	-3.3 °C	2.3 °C	20.8 °C	-16.7 °C	0	0	22
March	13.6 °C	1.7 °C	8.0 °C	31.5 °C	-19.5 °C	1	0	10
April	20.3 °C	7.9 °C	14.6 °C	31.4 °C	-4.7 °C	4	0	1
May	26.9 °C	14.0 °C	21.3 °C	37.4 °C	0.1 °C	22	7	0
June	33.1 °C	20.3 °C	27.6 °C	41.0 °C	11.4 °C	30	26	0
July	35.8 °C	24.4 °C	30.8 °C	42.0 °C	15.9 °C	31	30	0
August	34.8 °C	23.2 °C	29.7 °C	41.7 °C	10.7 °C	31	30	0
September	30.1 °C	18.5 °C	24.8 °C	38.5 °C	10.2 °C	28	17	0
October	22.8 °C	11.9 °C	17.7 °C	32.6 °C	3.1 °C	10	0	0
November	13.6 °C	3.8 °C	8.8 °C	25.3 °C	-12.3 °C	0	0	6
December	7.9 °C	-2.1 °C	2.9 °C	20.3 °C	-17.8 °C	0	0	21

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind
January	41 mm	7	10 h/day	41 %	61 %	9.7 km/h
February	47 mm	8	11 h/day	42 %	62 %	10.0 km/h
March	61 mm	9	12 h/day	44 %	58 %	10 km/h
April	48 mm	9	13 h/day	45 %	51 %	11 km/h
May	21 mm	5	14 h/day	35 %	36 %	13 km/h
June	6 mm	2	15 h/day	15 %	25 %	14 km/h
July	4 mm	1	14 h/day	12 %	24 %	13 km/h
August	4 mm	1	14 h/day	9 %	24 %	13 km/h
September	4 mm	1	12 h/day	8 %	27 %	12 km/h
October	21 mm	4	11 h/day	25 %	39 %	10 km/h
November	46 mm	7	10 h/day	40 %	57 %	8.7 km/h
December	43 mm	7	9.8 h/day	42 %	62 %	8.9 km/h

How Tehran compares

The same four figures for nearby destinations, so the numbers above have something to be read against. Summer high is the warmest month's average high; winter low is the coldest month's average low.

Destination	Summer high	Winter low	Rain per year	Days above 25 °C
Tehran	36 °C	-5.0 °C	346 mm	156
Eslamshahr · Iran	37 °C	-3.5 °C	313 mm	168
Golestān · Iran	37 °C	-3.2 °C	302 mm	171
Qarchak · Iran	38 °C	-2.5 °C	278 mm	176
Shahrīār · Iran	36 °C	-4.8 °C	291 mm	157
Pākdasht · Iran	37 °C	-2.1 °C	237 mm	171
Fardīs · Iran	35 °C	-5.6 °C	290 mm	151

Where Tehran ranks

Ranking	Position	Value
Places with the best weather in Asia in October	2ndof 50	98/100
Places with the best weather in the world in October	2ndof 50	98/100

Planning a trip? See the best time to visit Tehran.

QuestionsCommon questions about Tehran’s climate

When is the best time to visit Tehran?

That depends on what you want, so the honest answer is a comparison rather than a single month. May, September, October sit closest to 20 °C on average, July is the warmest month and July the driest. The month-by-month table above has the full picture.

How hot does Tehran get?

In July, the warmest month, daily highs average 36 °C. About 111 days a year pass 30 °C. The highest value in the 1991–2020 record is 42 °C.

How cold does it get in winter?

Nights average -5.0 °C in January, the coldest month. A normal year has 87 nights below freezing.

Which month is wettest in Tehran?

March, averaging 61 mm over 9 days with rain. The driest month is July with 4 mm. The year as a whole averages 346 mm.

Are these figures a forecast?

No. They are 1991–2020 climate normals: the average of thirty years, which describes what a month is usually like in Tehran rather than what any particular week will bring. Individual years can differ substantially from the normal.

Data sources and method

ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
Open-Meteo — Open-Meteo.com. CC BY 4.0
NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
GeoNames — GeoNames.org. CC BY 4.0

Normal period: 1991–2020
Dataset version: era5-1991-2020-scores1.1
Last processed: 1 August 2026

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: monthly rankings, daylight hours, beach and comfort scores. Full formulas are on the methodology page.

Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.