Zanjan climate

Name: Zanjan
Address: IR

Zanjan is warmest in August, with average highs of 29 °C, and coldest in January, when nights average -7.5 °C. April is the wettest month (74 mm) and August the driest (5.6 mm). Figures are 1991–2020 climate normals.

Across a full year Zanjan averages 450 mm of rain, 100 days above 25 °C and 125 days below freezing.

Iran · population 357,471 · 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 August 29 °C
Coldest month January -7.5 °C
Driest month August 6 mm
Wettest month April 74 mm
Least cloud August 29 % cloud
Hottest on record July 38 °C
Coldest on record February -24 °C

What to expectZanjan through the year

Zanjan has a clear annual cycle: average daily highs run from 2.1 °C in January to 29 °C in August, a swing of 24 °C in mean temperature across the year.

Counted across a normal year, 100 days a year reach 25 °C, 38 of them reach 30 °C, 125 nights drop below freezing. The warmest reading in the 1991–2020 record is 38 °C, in July.

Rain is strongly seasonal. April averages 74 mm against 6 mm in August — 13 times as much. Planning around the dry months matters more here than planning around temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	2.1 °C	41 mm	53 %
February	4.0 °C	51 mm	53 %
March	10.1 °C	67 mm	54 %
April	16.5 °C	74 mm	54 %
May	21.7 °C	55 mm	46 %
June	26.6 °C	15 mm	30 %
July	28.7 °C	9 mm	30 %
August	29.4 °C	6 mm	29 %
September	25.7 °C	7 mm	31 %
October	19.2 °C	33 mm	43 %
November	10.4 °C	52 mm	51 %
December	4.9 °C	40 mm	52 %

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	2.1 °C	-7.5 °C	-3.1 °C	14.6 °C	-23.8 °C	0	0	30
February	4.0 °C	-6.4 °C	-1.4 °C	17.5 °C	-24.3 °C	0	0	27
March	10.1 °C	-1.8 °C	4.1 °C	25.9 °C	-15.9 °C	0	0	21
April	16.5 °C	3.4 °C	10.0 °C	29.1 °C	-14.0 °C	1	0	4
May	21.7 °C	8.2 °C	15.0 °C	33.3 °C	-5.2 °C	6	0	0
June	26.6 °C	12.0 °C	19.1 °C	36.8 °C	3.3 °C	20	6	0
July	28.7 °C	13.9 °C	20.8 °C	38.0 °C	8.5 °C	25	12	0
August	29.4 °C	14.4 °C	21.3 °C	37.6 °C	6.9 °C	26	15	0
September	25.7 °C	11.7 °C	18.2 °C	36.0 °C	4.6 °C	19	4	0
October	19.2 °C	6.9 °C	12.6 °C	28.6 °C	-2.2 °C	3	0	0
November	10.4 °C	0.2 °C	4.9 °C	21.7 °C	-17.5 °C	0	0	14
December	4.9 °C	-4.7 °C	-0.3 °C	17.7 °C	-24.3 °C	0	0	28

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind
January	41 mm	8	9.9 h/day	53 %	74 %	13 km/h
February	51 mm	10	11 h/day	53 %	72 %	14 km/h
March	67 mm	12	12 h/day	54 %	66 %	17 km/h
April	74 mm	13	13 h/day	54 %	62 %	18 km/h
May	55 mm	11	14 h/day	46 %	59 %	16 km/h
June	15 mm	4	15 h/day	30 %	55 %	16 km/h
July	9 mm	2	14 h/day	30 %	59 %	17 km/h
August	6 mm	2	14 h/day	29 %	57 %	17 km/h
September	7 mm	2	12 h/day	31 %	56 %	15 km/h
October	33 mm	6	11 h/day	43 %	59 %	15 km/h
November	52 mm	8	10 h/day	51 %	68 %	13 km/h
December	40 mm	8	9.7 h/day	52 %	72 %	13 km/h

How Zanjan 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
Zanjan	29 °C	-7.5 °C	450 mm	100
Rasht · Iran	28 °C	2.2 °C	1,534 mm	99
Qazvin · Iran	33 °C	-4.0 °C	428 mm	134
Ardabīl · Iran	26 °C	-6.8 °C	470 mm	56
Sanandaj · Iran	35 °C	-7.1 °C	428 mm	140
Saqqez · Iran	34 °C	-6.8 °C	413 mm	130
Naz̧arābād · Iran	35 °C	-4.1 °C	356 mm	145

Where Zanjan ranks

Ranking	Position	Value
Places with the best weather in Asia in June	21st of 50	90/100
Places with the best weather in Asia in July	24th of 50	85/100

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

QuestionsCommon questions about Zanjan’s climate

When is the best time to visit Zanjan?

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

How hot does Zanjan get?

In August, the warmest month, daily highs average 29 °C. About 38 days a year pass 30 °C. The highest value in the 1991–2020 record is 38 °C.

How cold does it get in winter?

Nights average -7.5 °C in January, the coldest month. A normal year has 125 nights below freezing.

Which month is wettest in Zanjan?

April, averaging 74 mm over 13 days with rain. The driest month is August with 6 mm. The year as a whole averages 450 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 Zanjan 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
Data point: 36.676°, 48.496° (the coordinates the reanalysis values are taken for)
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.