Zanjan weather in September

In September, Zanjan sees average daytime highs of 25°C and overnight lows near 11°C, with 8 mm of rain across 2.2 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 11th-wettest month of the year here.

Highs ease over the month, from about 28°C in the first days to 23°C by the end. The sky is clear or mostly clear about 79% of the time in September, and the air most often feels dry.

Daylight stretches from about 12 h 48 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Zanjan's 3rd-clearest and 8th-windiest month. For the whole year in context, see Zanjan's year-round climate.

Daytime high
25°
4th warmest
Overnight low
11°
9th coldest
Rainfall
8 mm
2.2 wet days
Daylight
12 h 12 min
6:03 AM – 6:17 PM
Cloud cover
23%
3rd clearest
Wind
9 km/h
8th windiest
Solar energy
5.43 kWh/m²
Travel score
8.6
out of 10

Zanjan is city in Zanjan Province, Iran.

Air quality
Elevated
PM2.5 17.5 µg/m³ · 2020

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 28°C in the first days to 23°C by the end.

A typical September day in Zanjan reaches about 25°C in the afternoon and slips back to 11°C overnight — a 15°C spread between the day's warmth and the night's chill. On most days the high lands between 20°C and 30°C. Set against its neighbours, September runs about 4°C cooler than August and about 7°C warmer than October.

10°20°30°151015202530
Avg high (°C)Avg low (°C)
12813
22813
32812
42712
52712
62712
72712
82712
92712
102612
112611
122611
132611
142611
152611
162511
172511
182510
192510
202510
212510
222410
232410
242410
25249
26249
27239
28239
29239
30239

How September really feels in Zanjan

Once humidity and wind are folded in, September averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Zanjan weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -7°438.98.59.80.0
Feb / -6°539.98.110.60.2
Mar10° / -1°6812.76.811.72.2
Apr16° / 7613.31.512.94.5
May21° / 5812.50.113.96.4
Jun26° / 12°174.7014.58.0
Jul29° / 14°102.8014.37.4
Aug29° / 14°62.1013.47.2
Sep25° / 11°82.2012.28.6
Oct19° / 356.60.411.16.8
Nov10° / 558.83.6102.5
Dec / -4°407.86.59.50.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 79% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 12% of September, with mostly cloudy or overcast conditions the remaining 9%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1946
2946
3946
4946
5946
6946
7937
8928
9928
10928
11919
12919
13919
14919
15919
16919
17919
18919
19919
20919
219010
229010
239010
248911
258911
268812
278713
288614
298515
308416

Chance of precipitation in September

Any precipitation

Zanjan gets around 8 mm of rain over 2.2 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 8% and peaks near 12% on the wettest days.

0%10%20%30%151015202530
Rain chance (%)
18
28
38
48
57
67
77
87
97
107
117
127
137
147
157
167
177
187
197
207
218
228
238
249
259
2610
2710
2811
2911
3012

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the dry band about 97% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)
1928
2928
3937
4937
5946
6946
7955
8955
9964
10964
11964
12973
13973
14982
15982
16982
17982
18991
19991
20991
21991
221000
231000
241000
251000
261000
271000
281000
291000
301000

Wind in September

Winds average 9 km/h in September.

Across September, daily wind ranges from about 9 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
19calm
29calm
39calm
49calm
59calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 48 min at the start of September to 11 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 66 minutes over September. Sunrise moves from 5:51 AM to 6:15 AM, and sunset from 6:40 PM to 5:55 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:516:40
212.85:526:39
312.75:536:37
412.75:546:36
512.75:546:34
612.65:556:33
712.65:566:31
812.55:576:30
912.55:586:28
1012.55:586:27
1112.45:596:25
1212.46:006:24
1312.36:016:22
1412.36:026:20
1512.36:036:19
1612.26:036:17
1712.26:046:16
1812.26:056:14
1912.16:066:13
2012.16:076:11
2112.06:086:09
2212.06:086:08
2311.96:096:06
2411.96:106:05
2511.96:116:03
2611.86:126:02
2711.86:136:00
2811.76:145:58
2911.76:145:57
3011.76:155:55

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.43 kWh/m².

For context, solar energy here swings from a low near 2.51 kWh/m² to a high of 7.34 kWh/m² in June across the year — September's 5.43 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.1Intense
26.0Intense
36.0Bright
45.9Bright
55.9Bright
65.8Bright
75.8Bright
85.8Bright
95.7Bright
105.7Bright
115.6Bright
125.6Bright
135.5Bright
145.5Bright
155.4Bright
165.4Bright
175.3Bright
185.3Bright
195.3Bright
205.2Bright
215.2Bright
225.1Bright
235.1Bright
245.0Bright
255.0Bright
265.0Bright
274.9Bright
284.9Bright
294.8Bright
304.8Bright
Planning a trip in September

Is September a good time to visit Zanjan?

Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

8.6
Sightseeing
1st-best month of the year
7.8
Beach & pool
3rd-best month of the year

September is one of the better times to visit Zanjan for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Zanjan in September

From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In September, Zanjan sees daytime highs around 25°C and nights near 11°C. Worth packing: light clothes and sun protection.

light clothessun protection

UV index in Zanjan in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Zanjan peaks around July 18 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near January 13 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateVery highExtremeVery highHighModerateJul 18UV 11Jan 13UV 3
UV index (midday)Level
Jan3Moderate
Feb5Moderate
Mar5Moderate
Apr7Very high
May9Very high
Jun10Extreme
Jul11Extreme
Aug10Extreme
Sep8Very high
Oct5High
Nov3Moderate
Dec4Moderate

Air quality in Zanjan in September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.

Air quality in Zanjan is worst in April — around 25 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (July, 13 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Zanjan's WHO annual average of 17.5 µg/m³.

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateApr 1724 µg/m³Jul 2214 µg/m³
PM2.5 (µg/m³)Level
Jan16Moderate
Feb17Moderate
Mar23Moderate
Apr25Moderate
May23Moderate
Jun17Moderate
Jul13Moderate
Aug14Moderate
Sep15Moderate
Oct16Moderate
Nov16Moderate
Dec15Moderate
Location & terrain

Where is Zanjan?

Zanjan sits at 36.7°N, 48.5°E, 1,666 m above sea level, in Iran. The nearest listed city is Qīdar, 63 km away.

Şowme‘eh Sarā

Topography around Zanjan

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Zanjan.

Within 3 km, the terrain around Zanjan has only modest variations in elevation — a maximum elevation change of 175 m around an average of 1,672 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,155 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,101 m.

The land around Zanjan is covered by artificial surfaces (73%) within 3 km, grassland (51%) and cropland (30%) within 16 km, and grassland (53%) and cropland (36%) within 80 km.

3 km
175 m
16 km
1,155 m
80 km
3,101 m
treesgrasslandcroplandartificial surfacesbare terrain
September weather nearby: Qīdar 63 km · Manjīl 81 km · Khorramdarreh 81 km · Pādegān-e Manjīl 82 km · Abhar 87 km · Fūman 95 km · Māsāl 95 km · Şowme‘eh Sarā 101 km

Iran travel facts

Travel advisory
Level 4
Do Not Travel
Power plugs
Type C / F
220 V · 50 Hz
Prices
≈ 352% of US
price level, 2025
GDP per capita
$3,924
2025
Happiness
5.2 / 10
World Happiness, 2025
Safe drinking water
94%
of population, 2024
Homicide rate
2.4
per 100k, 2014
Road deaths
21.5
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Low
EF EPI 492
Religion
Muslim 99%Christian 1%Baha'i 0%agnostic 0%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Zanjan (36.6764°, 48.4963°, elevation 1,666 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).