Tehran weather in September

In September, Tehran sees average daytime highs of 26°C and overnight lows near 16°C, with 5 mm of rain across 0.9 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 28°C in the first days to 23°C by the end. The sky is clear or mostly clear about 93% 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 Tehran's 1st-clearest and 6th-windiest month. For the whole year in context, see Tehran's year-round climate.

Daytime high: 26°; 4th warmest
Overnight low: 16°; 9th coldest
Rainfall: 5 mm; 0.9 wet days
Daylight: 12 h 12 min; 5:52 AM – 6:05 PM
Cloud cover: 9%; 1st clearest
Wind: 6 km/h; 6th windiest
Solar energy: 5.97 kWh/m²
Travel score: 9.0; out of 10

Tehran is capital city of Iran.

Air quality: High; PM2.5 31.4 µg/m³ · 2020
Density: 10,428/km²; people per km²
Founded: 1794

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

← August Tehran year-round climate October →Best places to visit in September

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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 Tehran reaches about 26°C in the afternoon and slips back to 16°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 22°C and 29°C. Set against its neighbours, September runs about 4°C cooler than August and about 7°C warmer than October.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Avg high (°C)	28	28	28	28	28	28	28	27	27	27	27	27	26	26	26	26	26	25	25	25	25	25	24	24	24	24	23	23	23	23
Avg low (°C)	19	19	19	18	18	18	18	18	18	17	17	17	17	17	17	16	16	16	16	16	15	15	15	15	15	14	14	14	14	13

	Avg high (°C)	Avg low (°C)
1	28	19
2	28	19
3	28	19
4	28	18
5	28	18
6	28	18
7	28	18
8	27	18
9	27	18
10	27	17
11	27	17
12	27	17
13	26	17
14	26	17
15	26	17
16	26	16
17	26	16
18	25	16
19	25	16
20	25	16
21	25	15
22	25	15
23	24	15
24	24	15
25	24	15
26	24	14
27	23	14
28	23	14
29	23	14
30	23	13

How September really feels in Tehran

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

heat index over the day's high

Days feeling ≤ 0°C

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.

Tehran 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.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Snow days	Daylight (hours)	Travel score
Jan	1° / -7°	42	7.6	6.7	9.9	0.0
Feb	3° / -6°	48	8.4	6.8	10.6	0.0
Mar	8° / -0°	62	9.5	5.5	11.7	1.6
Apr	15° / 6°	51	9.5	1.1	12.9	4.8
May	22° / 13°	22	4.9	0.1	13.9	7.7
Jun	28° / 18°	6	1.6	0	14.4	7.7
Jul	31° / 22°	5	1.2	0	14.2	5.9
Aug	30° / 21°	4	0.8	0	13.3	6.7
Sep	26° / 16°	5	0.9	0	12.2	9.0
Oct	19° / 10°	21	4.1	0.1	11.1	7.3
Nov	10° / 2°	44	7.1	3	10.1	2.5
Dec	4° / -5°	43	7.7	5.9	9.6	0.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 93% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 5% of September, with mostly cloudy or overcast conditions the remaining 2%. Skies tend to cloud over as the month goes on.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Clearer (%)	99	99	99	99	99	99	99	99	99	99	99	99	98	98	98	98	98	98	98	98	98	98	97	97	96	96	96	95	95	94
Cloudier (%)	1	1	1	1	1	1	1	1	1	1	1	1	2	2	2	2	2	2	2	2	2	2	3	3	4	4	4	5	5	6

	Clearer (%)	Cloudier (%)
1	99	1
2	99	1
3	99	1
4	99	1
5	99	1
6	99	1
7	99	1
8	99	1
9	99	1
10	99	1
11	99	1
12	99	1
13	98	2
14	98	2
15	98	2
16	98	2
17	98	2
18	98	2
19	98	2
20	98	2
21	98	2
22	98	2
23	97	3
24	97	3
25	96	4
26	96	4
27	96	4
28	95	5
29	95	5
30	94	6

Chance of precipitation in September

Any precipitation

Tehran gets around 5 mm of rain over 0.9 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 3% and peaks near 6% on the wettest days.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Rain chance (%)	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	4	4	4	4	4	4	4	5	5	6

	Rain chance (%)
1	3
2	3
3	3
4	3
5	3
6	3
7	3
8	3
9	3
10	3
11	3
12	3
13	3
14	3
15	3
16	3
17	3
18	3
19	3
20	3
21	4
22	4
23	4
24	4
25	4
26	4
27	4
28	5
29	5
30	6

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.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Dry (%)	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100

Wind in September

Winds average 6 km/h in September.

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

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Wind speed (km/h)	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6
Feels	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm

	Wind speed (km/h)	Feels
1	6	calm
2	6	calm
3	6	calm
4	6	calm
5	6	calm
6	6	calm
7	6	calm
8	6	calm
9	6	calm
10	6	calm
11	6	calm
12	6	calm
13	6	calm
14	6	calm
15	6	calm
16	6	calm
17	6	calm
18	6	calm
19	6	calm
20	6	calm
21	6	calm
22	6	calm
23	6	calm
24	6	calm
25	6	calm
26	6	calm
27	6	calm
28	6	calm
29	6	calm
30	6	calm

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 5:40 AM to 6:03 AM, and sunset from 6:28 PM to 5:44 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Daylight (h)	12.8	12.8	12.7	12.7	12.6	12.6	12.6	12.5	12.5	12.5	12.4	12.4	12.3	12.3	12.3	12.2	12.2	12.1	12.1	12.1	12.0	12.0	12.0	11.9	11.9	11.8	11.8	11.8	11.7	11.7
Sunrise (AM)	5:40	5:41	5:42	5:43	5:43	5:44	5:45	5:46	5:47	5:47	5:48	5:49	5:50	5:50	5:51	5:52	5:53	5:54	5:54	5:55	5:56	5:57	5:58	5:58	5:59	6:00	6:01	6:02	6:02	6:03
Sunset (PM)	6:28	6:26	6:25	6:23	6:22	6:20	6:19	6:17	6:16	6:14	6:13	6:11	6:10	6:08	6:07	6:05	6:04	6:02	6:01	5:59	5:58	5:56	5:55	5:53	5:52	5:50	5:49	5:47	5:46	5:44

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.8	5:40	6:28
2	12.8	5:41	6:26
3	12.7	5:42	6:25
4	12.7	5:43	6:23
5	12.6	5:43	6:22
6	12.6	5:44	6:20
7	12.6	5:45	6:19
8	12.5	5:46	6:17
9	12.5	5:47	6:16
10	12.5	5:47	6:14
11	12.4	5:48	6:13
12	12.4	5:49	6:11
13	12.3	5:50	6:10
14	12.3	5:50	6:08
15	12.3	5:51	6:07
16	12.2	5:52	6:05
17	12.2	5:53	6:04
18	12.1	5:54	6:02
19	12.1	5:54	6:01
20	12.1	5:55	5:59
21	12.0	5:56	5:58
22	12.0	5:57	5:56
23	12.0	5:58	5:55
24	11.9	5:58	5:53
25	11.9	5:59	5:52
26	11.8	6:00	5:50
27	11.8	6:01	5:49
28	11.8	6:02	5:47
29	11.7	6:02	5:46
30	11.7	6:03	5:44

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.97 kWh/m².

For context, solar energy here swings from a low near 2.9 kWh/m² to a high of 7.69 kWh/m² in June across the year — September's 5.97 kWh/m² falls in the middle.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Solar energy (kWh/m²)	6.5	6.5	6.5	6.4	6.4	6.4	6.3	6.3	6.2	6.2	6.2	6.1	6.1	6.0	6.0	5.9	5.9	5.8	5.8	5.8	5.7	5.7	5.6	5.6	5.5	5.5	5.4	5.4	5.3	5.3
Level	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	6.5	Intense
2	6.5	Intense
3	6.5	Intense
4	6.4	Intense
5	6.4	Intense
6	6.4	Intense
7	6.3	Intense
8	6.3	Intense
9	6.2	Intense
10	6.2	Intense
11	6.2	Intense
12	6.1	Intense
13	6.1	Intense
14	6.0	Intense
15	6.0	Bright
16	5.9	Bright
17	5.9	Bright
18	5.8	Bright
19	5.8	Bright
20	5.8	Bright
21	5.7	Bright
22	5.7	Bright
23	5.6	Bright
24	5.6	Bright
25	5.5	Bright
26	5.5	Bright
27	5.4	Bright
28	5.4	Bright
29	5.3	Bright
30	5.3	Bright

Planning a trip in September

Is September a good time to visit Tehran?

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

9.0

Sightseeing

1st-best month of the year

8.3

Beach & pool

4th-best month of the year

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

What to pack for Tehran in September

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

In September, Tehran sees daytime highs around 26°C and nights near 16°C. Worth packing: light clothes and sun protection.

light clothessun protection

UV index in Tehran in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Tehran peaks around July 17 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	3	5	5	7	9	10	10	10	7	6	3	3
Level	Moderate	Moderate	Moderate	Very high	Very high	Very high	Extreme	Very high	Very high	High	Moderate	Moderate

	UV index (midday)	Level
Jan	3	Moderate
Feb	5	Moderate
Mar	5	Moderate
Apr	7	Very high
May	9	Very high
Jun	10	Very high
Jul	10	Extreme
Aug	10	Very high
Sep	7	Very high
Oct	6	High
Nov	3	Moderate
Dec	3	Moderate

Air quality in Tehran 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 Tehran is worst in January — around 47 µg/m³ PM2.5 (poor), about 3.1× the cleanest month (July, 15 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Tehran's WHO annual average of 31.4 µg/m³.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
PM2.5 (µg/m³)	47	43	35	31	26	20	15	18	24	32	38	46
Level	Poor	Poor	Poor	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Poor	Poor

	PM2.5 (µg/m³)	Level
Jan	47	Poor
Feb	43	Poor
Mar	35	Poor
Apr	31	Moderate
May	26	Moderate
Jun	20	Moderate
Jul	15	Moderate
Aug	18	Moderate
Sep	24	Moderate
Oct	32	Moderate
Nov	38	Poor
Dec	46	Poor

Location & terrain

Where is Tehran?

Tehran sits at 35.7°N, 51.4°E, 1,178 m above sea level, in Iran. The nearest listed city is Vaḩīdīyeh, 5.0 km away.

Topography around Tehran

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

Within 3 km, the terrain around Tehran has only modest variations in elevation — a maximum elevation change of 152 m around an average of 1,186 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,728 m; within 80 km, extreme variations in elevation — a maximum elevation change of 5,034 m.

The land around Tehran is covered by artificial surfaces (96%) within 3 km, artificial surfaces (60%) within 16 km, and bare terrain (38%) and grassland (37%) within 80 km.

3 km

152 m

artificial surfaces 96%

16 km

1,728 m

artificial surfaces 60%

80 km

5,034 m

bare terrain 38%

treesshrubsgrasslandcroplandartificial surfacesbare terrain

← August Tehran year-round climate October →Best places to visit in September

September weather nearby: Vaḩīdīyeh 5.0 km · Shahrak-e Qods 8.0 km · Morteẕá Gerd 12 km · Tajrīsh 12 km · Shahrak-e ‘Alā’īn 13 km · Andīsheh 14 km · Chahār Dangeh 14 km · Bāqershahr 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

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 Tehran (35.6944°, 51.4215°, elevation 1,178 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).

	Avg high (°C)	Avg low (°C)
1	28	19
2	28	19
3	28	19
4	28	18
5	28	18
6	28	18
7	28	18
8	27	18
9	27	18
10	27	17
11	27	17
12	27	17
13	26	17
14	26	17
15	26	17
16	26	16
17	26	16
18	25	16
19	25	16
20	25	16
21	25	15
22	25	15
23	24	15
24	24	15
25	24	15
26	24	14
27	23	14
28	23	14
29	23	14
30	23	13

	Clearer (%)	Cloudier (%)
1	99	1
2	99	1
3	99	1
4	99	1
5	99	1
6	99	1
7	99	1
8	99	1
9	99	1
10	99	1
11	99	1
12	99	1
13	98	2
14	98	2
15	98	2
16	98	2
17	98	2
18	98	2
19	98	2
20	98	2
21	98	2
22	98	2
23	97	3
24	97	3
25	96	4
26	96	4
27	96	4
28	95	5
29	95	5
30	94	6

	Rain chance (%)
1	3
2	3
3	3
4	3
5	3
6	3
7	3
8	3
9	3
10	3
11	3
12	3
13	3
14	3
15	3
16	3
17	3
18	3
19	3
20	3
21	4
22	4
23	4
24	4
25	4
26	4
27	4
28	5
29	5
30	6

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100

	Avg high (°C)	Avg low (°C)
1	28	19
2	28	19
3	28	19
4	28	18
5	28	18
6	28	18
7	28	18
8	27	18
9	27	18
10	27	17
11	27	17
12	27	17
13	26	17
14	26	17
15	26	17
16	26	16
17	26	16
18	25	16
19	25	16
20	25	16
21	25	15
22	25	15
23	24	15
24	24	15
25	24	15
26	24	14
27	23	14
28	23	14
29	23	14
30	23	13

	Clearer (%)	Cloudier (%)
1	99	1
2	99	1
3	99	1
4	99	1
5	99	1
6	99	1
7	99	1
8	99	1
9	99	1
10	99	1
11	99	1
12	99	1
13	98	2
14	98	2
15	98	2
16	98	2
17	98	2
18	98	2
19	98	2
20	98	2
21	98	2
22	98	2
23	97	3
24	97	3
25	96	4
26	96	4
27	96	4
28	95	5
29	95	5
30	94	6

	Rain chance (%)
1	3
2	3
3	3
4	3
5	3
6	3
7	3
8	3
9	3
10	3
11	3
12	3
13	3
14	3
15	3
16	3
17	3
18	3
19	3
20	3
21	4
22	4
23	4
24	4
25	4
26	4
27	4
28	5
29	5
30	6

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100

	Avg high (°C)	Avg low (°C)
1	28	19
2	28	19
3	28	19
4	28	18
5	28	18
6	28	18
7	28	18
8	27	18
9	27	18
10	27	17
11	27	17
12	27	17
13	26	17
14	26	17
15	26	17
16	26	16
17	26	16
18	25	16
19	25	16
20	25	16
21	25	15
22	25	15
23	24	15
24	24	15
25	24	15
26	24	14
27	23	14
28	23	14
29	23	14
30	23	13

	Clearer (%)	Cloudier (%)
1	99	1
2	99	1
3	99	1
4	99	1
5	99	1
6	99	1
7	99	1
8	99	1
9	99	1
10	99	1
11	99	1
12	99	1
13	98	2
14	98	2
15	98	2
16	98	2
17	98	2
18	98	2
19	98	2
20	98	2
21	98	2
22	98	2
23	97	3
24	97	3
25	96	4
26	96	4
27	96	4
28	95	5
29	95	5
30	94	6

	Rain chance (%)
1	3
2	3
3	3
4	3
5	3
6	3
7	3
8	3
9	3
10	3
11	3
12	3
13	3
14	3
15	3
16	3
17	3
18	3
19	3
20	3
21	4
22	4
23	4
24	4
25	4
26	4
27	4
28	5
29	5
30	6

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100