Fīrūzkūh weather in September

In September, Fīrūzkūh sees average daytime highs of 21°C and overnight lows near 11°C, with 32 mm of precipitation across 8.2 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 22°C in the first days to 18°C by the end. The sky is clear or mostly clear about 72% 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 Fīrūzkūh's 1st-clearest and 7th-windiest month. For the whole year in context, see Fīrūzkūh's year-round climate.

Daytime high: 21°; 4th warmest
Overnight low: 11°; 9th coldest
Precipitation: 32 mm; 8.2 wet days
Daylight: 12 h 12 min; 5:47 AM – 6:00 PM
Cloud cover: 25%; 1st clearest
Wind: 5 km/h; 7th windiest
Solar energy: 5.2 kWh/m²
Travel score: 7.3; out of 10

Fīrūzkūh is city in Tehran Province, Iran.

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

← August Fīrūzkūh 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 22°C in the first days to 18°C by the end.

A typical September day in Fīrūzkūh reaches about 21°C in the afternoon and slips back to 11°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 16°C and 25°C. Set against its neighbours, September runs about 3°C cooler than August and about 6°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)	23	23	23	22	22	22	22	22	22	22	22	21	21	21	21	21	21	20	20	20	20	20	19	19	19	19	19	18	18	18
Avg low (°C)	13	13	13	13	13	13	13	13	13	12	12	12	12	12	12	11	11	11	11	11	11	10	10	10	10	10	9	9	9	9

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

How September really feels in Fīrūzkūh

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.

Fīrūzkūh 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	-2° / -8°	27	6.5	7.4	9.9	0.0
Feb	-1° / -7°	36	7.3	7.9	10.6	0.0
Mar	4° / -3°	53	9.4	7.8	11.7	0.2
Apr	11° / 3°	63	11.9	3.4	12.9	2.5
May	17° / 8°	63	13.7	0.5	13.9	5.0
Jun	22° / 12°	43	10.7	0	14.4	6.9
Jul	25° / 15°	38	8.8	0	14.2	7.7
Aug	24° / 15°	33	7.7	0	13.4	8.0
Sep	21° / 11°	32	8.2	0	12.2	7.3
Oct	14° / 6°	36	8.7	1.2	11.1	4.7
Nov	7° / -1°	35	7.6	5.9	10.1	0.9
Dec	1° / -6°	27	6.4	6.7	9.6	0.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 72% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 18% of September, with mostly cloudy or overcast conditions the remaining 11%.

	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 (%)	93	93	93	93	93	93	92	92	92	91	91	91	90	90	90	90	90	89	89	89	89	88	87	87	87	86	85	85	84	83
Cloudier (%)	7	7	7	7	7	7	8	8	8	9	9	9	10	10	10	10	10	11	11	11	11	12	13	13	13	14	15	15	16	17

	Clearer (%)	Cloudier (%)
1	93	7
2	93	7
3	93	7
4	93	7
5	93	7
6	93	7
7	92	8
8	92	8
9	92	8
10	91	9
11	91	9
12	91	9
13	90	10
14	90	10
15	90	10
16	90	10
17	90	10
18	89	11
19	89	11
20	89	11
21	89	11
22	88	12
23	87	13
24	87	13
25	87	13
26	86	14
27	85	15
28	85	15
29	84	16
30	83	17

Chance of precipitation in September

Any precipitationSnow

Fīrūzkūh gets around 32 mm of rain and snow over 8.2 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 28% and peaks near 29% 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 (%)	27	27	27	27	27	27	28	28	28	28	29	29	29	29	29	29	28	28	28	28	28	27	27	27	27	26	26	27	27	27
Snow chance (%)	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1	1	1	1	2	2

	Rain chance (%)	Snow chance (%)
1	27	0
2	27	0
3	27	0
4	27	0
5	27	0
6	27	0
7	28	0
8	28	0
9	28	0
10	28	0
11	29	0
12	29	0
13	29	0
14	29	0
15	29	0
16	29	0
17	28	0
18	28	0
19	28	0
20	28	0
21	28	0
22	27	0
23	27	0
24	27	0
25	27	1
26	26	1
27	26	1
28	27	1
29	27	2
30	27	2

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 5 km/h in September.

Across September, daily wind ranges from about 5 km/h on the calmest days to 5 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)	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5
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	5	calm
2	5	calm
3	5	calm
4	5	calm
5	5	calm
6	5	calm
7	5	calm
8	5	calm
9	5	calm
10	5	calm
11	5	calm
12	5	calm
13	5	calm
14	5	calm
15	5	calm
16	5	calm
17	5	calm
18	5	calm
19	5	calm
20	5	calm
21	5	calm
22	5	calm
23	5	calm
24	5	calm
25	5	calm
26	5	calm
27	5	calm
28	5	calm
29	5	calm
30	5	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 5:35 AM to 5:58 AM, and sunset from 6:22 PM to 5:39 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)	5:35	5:36	5:36	5:37	5:38	5:39	5:40	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	5:51	5:51	5:52	5:53	5:54	5:55	5:55	5:56	5:57	5:58
Sunset (PM)	6:22	6:21	6:20	6:18	6:17	6:15	6:14	6:12	6:11	6:09	6:08	6:06	6:05	6:03	6:01	6:00	5:58	5:57	5:55	5:54	5:52	5:51	5:49	5:48	5:46	5:45	5:43	5:42	5:40	5:39

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.8	5:35	6:22
2	12.8	5:36	6:21
3	12.7	5:36	6:20
4	12.7	5:37	6:18
5	12.6	5:38	6:17
6	12.6	5:39	6:15
7	12.6	5:40	6:14
8	12.5	5:40	6:12
9	12.5	5:41	6:11
10	12.5	5:42	6:09
11	12.4	5:43	6:08
12	12.4	5:43	6:06
13	12.3	5:44	6:05
14	12.3	5:45	6:03
15	12.3	5:46	6:01
16	12.2	5:47	6:00
17	12.2	5:47	5:58
18	12.1	5:48	5:57
19	12.1	5:49	5:55
20	12.1	5:50	5:54
21	12.0	5:51	5:52
22	12.0	5:51	5:51
23	12.0	5:52	5:49
24	11.9	5:53	5:48
25	11.9	5:54	5:46
26	11.8	5:55	5:45
27	11.8	5:55	5:43
28	11.8	5:56	5:42
29	11.7	5:57	5:40
30	11.7	5:58	5:39

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.2 kWh/m².

For context, solar energy here swings from a low near 2.92 kWh/m² to a high of 6.7 kWh/m² in June across the year — September's 5.2 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)	5.8	5.7	5.7	5.7	5.6	5.6	5.5	5.5	5.4	5.4	5.3	5.3	5.3	5.2	5.2	5.1	5.1	5.1	5.0	5.0	5.0	5.0	4.9	4.9	4.8	4.8	4.8	4.8	4.7	4.7
Level	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	5.8	Bright
2	5.7	Bright
3	5.7	Bright
4	5.7	Bright
5	5.6	Bright
6	5.6	Bright
7	5.5	Bright
8	5.5	Bright
9	5.4	Bright
10	5.4	Bright
11	5.3	Bright
12	5.3	Bright
13	5.3	Bright
14	5.2	Bright
15	5.2	Bright
16	5.1	Bright
17	5.1	Bright
18	5.1	Bright
19	5.0	Bright
20	5.0	Bright
21	5.0	Bright
22	5.0	Bright
23	4.9	Bright
24	4.9	Bright
25	4.8	Bright
26	4.8	Bright
27	4.8	Bright
28	4.8	Bright
29	4.7	Bright
30	4.7	Bright

Planning a trip in September

Is September a good time to visit Fīrūzkūh?

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

7.3

Sightseeing

3rd-best month of the year

4.1

Beach & pool

4th-best month of the year

September is one of the better times to visit Fīrūzkūh for general sightseeing.

What to pack for Fīrūzkūh in September

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

In September, Fīrūzkūh sees daytime highs around 21°C and nights near 11°C. Worth packing: rain gear and sun protection. About 8 days see rain.

rain gearsun protection

UV index in Fīrūzkūh 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 Fīrūzkūh peaks around July 19 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near January 11 at about 3 (moderate).

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	3	5	5	8	10	10	11	11	8	6	4	3
Level	Moderate	High	Moderate	Very high	Very high	Very high	Extreme	Extreme	Very high	High	Moderate	Moderate

	UV index (midday)	Level
Jan	3	Moderate
Feb	5	High
Mar	5	Moderate
Apr	8	Very high
May	10	Very high
Jun	10	Very high
Jul	11	Extreme
Aug	11	Extreme
Sep	8	Very high
Oct	6	High
Nov	4	Moderate
Dec	3	Moderate

Air quality in Fīrūzkūh 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 Fīrūzkūh is worst in December — around 97 µg/m³ PM2.5 (unhealthy), about 3.0× the cleanest month (July, 33 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
PM2.5 (µg/m³)	95	88	76	68	57	42	33	38	51	67	83	97
Level	Unhealthy	Unhealthy	Unhealthy	Unhealthy	Unhealthy	Poor	Moderate	Poor	Poor	Unhealthy	Unhealthy	Unhealthy

	PM2.5 (µg/m³)	Level
Jan	95	Unhealthy
Feb	88	Unhealthy
Mar	76	Unhealthy
Apr	68	Unhealthy
May	57	Unhealthy
Jun	42	Poor
Jul	33	Moderate
Aug	38	Poor
Sep	51	Poor
Oct	67	Unhealthy
Nov	83	Unhealthy
Dec	97	Unhealthy

Location & terrain

Where is Fīrūzkūh?

Fīrūzkūh sits at 35.8°N, 52.8°E, 1,943 m above sea level, in Iran. The nearest listed city is Zīr Āb, 50 km away.

Topography around Fīrūzkūh

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

Within 3 km, the terrain around Fīrūzkūh has significant variations in elevation — a maximum elevation change of 555 m around an average of 2,025 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,550 m; within 80 km, extreme variations in elevation — a maximum elevation change of 5,587 m.

The land around Fīrūzkūh is covered by grassland (47%) and bare terrain (21%) within 3 km, grassland (67%) and bare terrain (20%) within 16 km, and grassland (37%), bare terrain (37%) and trees (20%) within 80 km.

3 km

555 m

grassland 47%

16 km

1,550 m

grassland 67%

80 km

5,587 m

grassland 37%

treesgrasslandcroplandartificial surfacesbare terrain

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

September weather nearby: Zīr Āb 50 km · Mahdishahr 53 km · Semnan 60 km · Damāvand 63 km · Garmsār 71 km · Īstgāh-e Rāh Āhan-e Garmsār 72 km · Rūdehen 78 km · Qā’em Shahr 79 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 Fīrūzkūh (35.7567°, 52.7706°, elevation 1,943 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	23	13
2	23	13
3	23	13
4	22	13
5	22	13
6	22	13
7	22	13
8	22	13
9	22	13
10	22	12
11	22	12
12	21	12
13	21	12
14	21	12
15	21	12
16	21	11
17	21	11
18	20	11
19	20	11
20	20	11
21	20	11
22	20	10
23	19	10
24	19	10
25	19	10
26	19	10
27	19	9
28	18	9
29	18	9
30	18	9

	Clearer (%)	Cloudier (%)
1	93	7
2	93	7
3	93	7
4	93	7
5	93	7
6	93	7
7	92	8
8	92	8
9	92	8
10	91	9
11	91	9
12	91	9
13	90	10
14	90	10
15	90	10
16	90	10
17	90	10
18	89	11
19	89	11
20	89	11
21	89	11
22	88	12
23	87	13
24	87	13
25	87	13
26	86	14
27	85	15
28	85	15
29	84	16
30	83	17

	Rain chance (%)	Snow chance (%)
1	27	0
2	27	0
3	27	0
4	27	0
5	27	0
6	27	0
7	28	0
8	28	0
9	28	0
10	28	0
11	29	0
12	29	0
13	29	0
14	29	0
15	29	0
16	29	0
17	28	0
18	28	0
19	28	0
20	28	0
21	28	0
22	27	0
23	27	0
24	27	0
25	27	1
26	26	1
27	26	1
28	27	1
29	27	2
30	27	2

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

	Clearer (%)	Cloudier (%)
1	93	7
2	93	7
3	93	7
4	93	7
5	93	7
6	93	7
7	92	8
8	92	8
9	92	8
10	91	9
11	91	9
12	91	9
13	90	10
14	90	10
15	90	10
16	90	10
17	90	10
18	89	11
19	89	11
20	89	11
21	89	11
22	88	12
23	87	13
24	87	13
25	87	13
26	86	14
27	85	15
28	85	15
29	84	16
30	83	17

	Rain chance (%)	Snow chance (%)
1	27	0
2	27	0
3	27	0
4	27	0
5	27	0
6	27	0
7	28	0
8	28	0
9	28	0
10	28	0
11	29	0
12	29	0
13	29	0
14	29	0
15	29	0
16	29	0
17	28	0
18	28	0
19	28	0
20	28	0
21	28	0
22	27	0
23	27	0
24	27	0
25	27	1
26	26	1
27	26	1
28	27	1
29	27	2
30	27	2

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

	Clearer (%)	Cloudier (%)
1	93	7
2	93	7
3	93	7
4	93	7
5	93	7
6	93	7
7	92	8
8	92	8
9	92	8
10	91	9
11	91	9
12	91	9
13	90	10
14	90	10
15	90	10
16	90	10
17	90	10
18	89	11
19	89	11
20	89	11
21	89	11
22	88	12
23	87	13
24	87	13
25	87	13
26	86	14
27	85	15
28	85	15
29	84	16
30	83	17

	Rain chance (%)	Snow chance (%)
1	27	0
2	27	0
3	27	0
4	27	0
5	27	0
6	27	0
7	28	0
8	28	0
9	28	0
10	28	0
11	29	0
12	29	0
13	29	0
14	29	0
15	29	0
16	29	0
17	28	0
18	28	0
19	28	0
20	28	0
21	28	0
22	27	0
23	27	0
24	27	0
25	27	1
26	26	1
27	26	1
28	27	1
29	27	2
30	27	2

	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