Isfahan weather in September

In September, Isfahan sees average daytime highs of 32°C and overnight lows near 15°C, with 0 mm of rain across 0.1 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 10th-wettest month of the year here.

Highs ease over the month, from about 34°C in the first days to 30°C by the end. The sky is clear or mostly clear about 97% of the time in September, and the air most often feels dry.

Daylight stretches from about 12 h 42 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Isfahan's 1st-clearest and 8th-windiest month. For the whole year in context, see Isfahan's year-round climate.

Daytime high
32°
4th warmest
Overnight low
15°
9th coldest
Rainfall
0 mm
0.1 wet days
Daylight
12 h 12 min
5:52 AM – 6:04 PM
Cloud cover
7%
1st clearest
Wind
7 km/h
8th windiest
Solar energy
6.46 kWh/m²
Travel score
5.3
out of 10

Isfahan is city in Isfahan Province, Iran.

Air quality
High
PM2.5 29.9 µg/m³ · 2016
Density
3,133/km²
people per km²

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 34°C in the first days to 30°C by the end.

A typical September day in Isfahan reaches about 32°C in the afternoon and slips back to 15°C overnight — a 17°C spread between the day's warmth and the night's chill. On most days the high lands between 29°C and 35°C. Set against its neighbours, September runs about 4°C cooler than August and about 7°C warmer than October.

10°20°30°40°151015202530
Avg high (°C)Avg low (°C)
13518
23518
33417
43417
53417
63417
73417
83417
93416
103316
113316
123316
133316
143316
153315
163215
173215
183215
193215
203215
213115
223114
233114
243114
253114
263014
273014
283013
293013
302913

How September really feels in Isfahan

Once humidity and wind are folded in, September averages 18 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
18
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Isfahan weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan10° / -2°153.31.710.12.6
Feb13° / 122.70.410.84.7
Mar18° / 153.5011.87.1
Apr24° / 10°103012.88.1
May29° / 15°71.9013.76.6
Jun35° / 19°10.3014.13.4
Jul38° / 22°00013.91.7
Aug36° / 20°00013.22.6
Sep32° / 15°00.1012.25.3
Oct25° / 10°30.7011.28.7
Nov17° / 152.50.210.36.5
Dec11° / -0°1230.59.93.5

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 97% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 3% of September, with mostly cloudy or overcast conditions the remaining 1%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
11000
21000
31000
41000
51000
61000
71000
81000
91000
101000
111000
121000
131000
141000
151000
161000
171000
181000
191000
201000
211000
22991
23991
24991
25982
26982
27982
28973
29973
30973

Chance of precipitation in September

Any precipitation

Isfahan gets around 0 mm of rain over 0.1 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 0% and peaks near 1% on the wettest days.

0%10%20%30%151015202530
Rain chance (%)
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
210
220
230
240
250
260
270
280
291
301

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 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)
1100
2100
3100
4100
5100
6100
7100
8100
9100
10100
11100
12100
13100
14100
15100
16100
17100
18100
19100
20100
21100
22100
23100
24100
25100
26100
27100
28100
29100
30100

Wind in September

Winds average 7 km/h in September.

Across September, daily wind ranges from about 6 km/h on the calmest days to 7 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 42 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 60 minutes over September. Sunrise moves from 5:42 AM to 6:01 AM, and sunset from 6:24 PM to 5:44 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.75:426:24
212.75:426:23
312.65:436:22
412.65:446:20
512.65:446:19
612.55:456:17
712.55:466:16
812.55:466:15
912.45:476:13
1012.45:486:12
1112.45:486:11
1212.35:496:09
1312.35:506:08
1412.35:506:06
1512.25:516:05
1612.25:526:04
1712.25:526:02
1812.15:536:01
1912.15:545:59
2012.15:545:58
2112.05:555:57
2212.05:565:55
2312.05:565:54
2411.95:575:52
2511.95:585:51
2611.95:585:50
2711.85:595:48
2811.86:005:47
2911.86:005:45
3011.76:015:44

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.46 kWh/m².

For context, solar energy here swings from a low near 3.28 kWh/m² to a high of 8.05 kWh/m² in June across the year — September's 6.46 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
17.0Intense
27.0Intense
36.9Intense
46.9Intense
56.9Intense
66.8Intense
76.8Intense
86.8Intense
96.7Intense
106.7Intense
116.6Intense
126.6Intense
136.5Intense
146.5Intense
156.5Intense
166.4Intense
176.4Intense
186.3Intense
196.3Intense
206.3Intense
216.2Intense
226.2Intense
236.2Intense
246.1Intense
256.1Intense
266.0Intense
276.0Bright
285.9Bright
295.9Bright
305.8Bright
Planning a trip in September

Is September a good time to visit Isfahan?

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

5.3
Sightseeing
6th-best month of the year
8.6
Beach & pool
1st-best month of the year

September is a reasonable time to visit Isfahan for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Isfahan in September

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

In September, Isfahan sees daytime highs around 32°C and nights near 15°C. Pack light clothes and sun protection.

light clothessun protection

UV index in Isfahan in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Isfahan peaks around July 16 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highModerateJul 16UV 11Jan 1UV 3
UV index (midday)Level
Jan3Moderate
Feb5High
Mar6High
Apr8Very high
May10Extreme
Jun10Extreme
Jul11Extreme
Aug10Extreme
Sep8Very high
Oct7Very high
Nov4Moderate
Dec3Moderate

Air quality in Isfahan 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 Isfahan is worst in April — around 39 µg/m³ PM2.5 (poor), about 1.7× the cleanest month (August, 23 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Isfahan's WHO annual average of 29.9 µg/m³.

0204060JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorModerateApr 2038 µg/m³Aug 1924 µg/m³
PM2.5 (µg/m³)Level
Jan29Moderate
Feb31Moderate
Mar34Moderate
Apr39Poor
May37Poor
Jun27Moderate
Jul32Moderate
Aug23Moderate
Sep28Moderate
Oct27Moderate
Nov25Moderate
Dec27Moderate
Location & terrain

Where is Isfahan?

Isfahan sits at 32.7°N, 51.7°E, 1,578 m above sea level, in Iran. The nearest listed city is Rehnān, 8.0 km away.

Topography around Isfahan

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

Within 3 km, the terrain around Isfahan has only modest variations in elevation — a maximum elevation change of 38 m around an average of 1,575 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 684 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,808 m.

The land around Isfahan is covered by artificial surfaces (93%) within 3 km, bare terrain (38%), artificial surfaces (35%) and cropland (23%) within 16 km, and bare terrain (85%) within 80 km.

3 km
38 m
16 km
684 m
80 km
1,808 m
treesshrubsgrasslandcroplandartificial surfacesbare terrain
September weather nearby: Rehnān 8.0 km · Dorcheh Pīāz 12 km · Khomeynī Shahr 13 km · Khowrzūq 14 km · Abrīsham 14 km · Dowlatābād 16 km · Dastgerd 17 km · Gaz-e Borkhar 18 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 Isfahan (32.6525°, 51.6746°, elevation 1,578 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).