Zīr Āb weather in September

In September, Zīr Āb sees average daytime highs of 24°C and overnight lows near 16°C, with 153 mm of rain across 14 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 1st-wettest month of the year here.

Highs ease over the month, from about 26°C in the first days to 23°C by the end. The sky is clear or mostly clear about 36% of the time in September, and the air most often feels humid.

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 Zīr Āb's 7th-clearest and 10th-windiest month. For the whole year in context, see Zīr Āb's year-round climate.

Daytime high
24°
4th warmest
Overnight low
16°
9th coldest
Rainfall
153 mm
14 wet days
Daylight
12 h 12 min
5:46 AM – 5:59 PM
Cloud cover
55%
7th clearest
Wind
5 km/h
10th windiest
Solar energy
4.34 kWh/m²
Travel score
6.2
out of 10

Zīr Āb is city in Mazandaran Province, Iran.

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 26°C in the first days to 23°C by the end.

A typical September day in Zīr Āb reaches about 24°C in the afternoon and slips back to 16°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 20°C and 28°C. Set against its neighbours, September runs about 3°C cooler than August and about 4°C warmer than October.

10°15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12618
22618
32618
42618
52618
62618
72618
82518
92517
102517
112517
122517
132517
142517
152517
162416
172416
182416
192416
202416
212416
222415
232415
242315
252315
262315
272314
282314
292314
302214

How September really feels in Zīr Āb

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.

Zīr Āb weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -1°719.769.82.0
Feb10° / -0°79116.310.62.2
Mar13° / 10014.34.511.73.4
Apr17° / 9815.10.912.94.8
May21° / 13°10516013.95.6
Jun25° / 17°7511.8014.46.5
Jul27° / 19°7312.8014.26.2
Aug27° / 19°8312.3013.46.2
Sep24° / 16°15314012.26.2
Oct20° / 11°12412.6011.16.1
Nov15° / 10511.91.810.14.4
Dec11° / 699.349.62.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 36% 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 52%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15347
25248
35248
45149
55149
64951
74951
84852
94753
104654
114654
124654
134456
144456
154555
164654
174654
184654
194654
204753
214852
224852
234951
244951
255050
265050
275050
285050
295050
305050

Chance of precipitation in September

Any precipitation

Zīr Āb gets around 153 mm of rain over 14 wet days in September, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 47% and peaks near 50% on the wettest days.

0%20%40%60%151015202530
Rain chance (%)
144
245
345
446
547
648
748
849
949
1049
1150
1250
1350
1450
1549
1649
1748
1848
1947
2047
2146
2245
2345
2444
2544
2644
2744
2844
2944
3044

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the humid band about 35% of days. Sticky, muggy-or-worse air turns up on roughly 32% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
131428506
231429495
331429495
431530485
531530484
631631474
731632463
831633453
931734443
1031735423
1131836402
1241937392
1342038372
1452038352
1552239331
1662340301
1772440281
1872540261
1982741241
2092941210
21103040190
22113240170
23133339150
24143538130
25163636120
26173735100
2719383490
2821393280
2923403170
3025402960

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.

0246810151015202530
Wind speed (km/h)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm

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 5:34 AM to 5:57 AM, and sunset from 6:22 PM to 5:38 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:346:22
212.85:346:21
312.75:356:19
412.75:366:18
512.75:376:16
612.65:386:15
712.65:386:13
812.55:396:12
912.55:406:10
1012.55:416:08
1112.45:426:07
1212.45:426:05
1312.35:436:04
1412.35:446:02
1512.35:456:01
1612.25:465:59
1712.25:465:58
1812.15:475:56
1912.15:485:55
2012.15:495:53
2112.05:505:51
2212.05:515:50
2312.05:515:48
2411.95:525:47
2511.95:535:45
2611.85:545:44
2711.85:555:42
2811.85:555:41
2911.75:565:39
3011.75:575:38

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.34 kWh/m².

For context, solar energy here swings from a low near 2.45 kWh/m² to a high of 5.67 kWh/m² in June across the year — September's 4.34 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.9Bright
24.9Bright
34.8Bright
44.8Bright
54.7Bright
64.7Bright
74.6Bright
84.6Bright
94.5Bright
104.5Bright
114.5Bright
124.4Bright
134.4Bright
144.3Bright
154.3Bright
164.3Bright
174.2Bright
184.2Bright
194.2Bright
204.2Bright
214.1Bright
224.1Bright
234.1Bright
244.1Bright
254.0Bright
264.0Bright
274.0Moderate
284.0Moderate
293.9Moderate
303.9Moderate
Planning a trip in September

Is September a good time to visit Zīr Āb?

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

6.2
Sightseeing
2nd-best month of the year
5.4
Beach & pool
4th-best month of the year

September is a reasonable time to visit Zīr Āb for sightseeing.

What to pack for Zīr Āb in September

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

In September, Zīr Āb sees daytime highs around 24°C and nights near 16°C. Pack rain gear. Worth having: light clothes. About 14 days see rain.

rain gearlight clothes

UV index in Zīr Āb 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 Zīr Āb peaks around July 21 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near January 12 at about 3 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highHighModerateJul 21UV 11Jan 12UV 3
UV index (midday)Level
Jan3Moderate
Feb5Moderate
Mar5High
Apr8Very high
May10Very high
Jun9Very high
Jul11Extreme
Aug10Extreme
Sep8Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in Zīr Āb 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 Zīr Āb is worst in December — around 45 µg/m³ PM2.5 (poor), about 2.1× the cleanest month (July, 22 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecPoorModeratePoorDec 1944 µg/m³Jul 1822 µg/m³
PM2.5 (µg/m³)Level
Jan43Poor
Feb41Poor
Mar39Poor
Apr38Poor
May33Moderate
Jun25Moderate
Jul22Moderate
Aug24Moderate
Sep31Moderate
Oct36Poor
Nov41Poor
Dec45Poor
Location & terrain

Where is Zīr Āb?

Zīr Āb sits at 36.2°N, 53.0°E, 398 m above sea level, in Iran. The nearest listed city is Qā’em Shahr, 33 km away.

Topography around Zīr Āb

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

Within 3 km, the terrain around Zīr Āb has large variations in elevation — a maximum elevation change of 760 m around an average of 648 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 2,045 m; within 80 km, extreme variations in elevation — a maximum elevation change of 5,024 m.

The land around Zīr Āb is covered by trees (81%) within 3 km, trees (89%) within 16 km, and trees (32%) and grassland (32%) within 80 km.

3 km
760 m
16 km
2,045 m
80 km
5,024 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Qā’em Shahr 33 km · Sari 43 km · Bābol 49 km · Fīrūzkūh 50 km · Jūybār 52 km · Amīr Kolā 54 km · Nekā 60 km · Mahdishahr 62 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 Zīr Āb (36.1797°, 52.9735°, elevation 398 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).