Sīāhkal weather in September

In September, Sīāhkal sees average daytime highs of 26°C and overnight lows near 19°C, with 169 mm of rain across 13.8 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 3rd-wettest month of the year here.

Highs ease over the month, from about 28°C in the first days to 25°C by the end. The sky is clear or mostly clear about 30% of the time in September, and the air most often feels muggy.

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 Sīāhkal's 8th-clearest and 10th-windiest month. For the whole year in context, see Sīāhkal's year-round climate.

Daytime high
26°
4th warmest
Overnight low
19°
9th coldest
Rainfall
169 mm
13.8 wet days
Daylight
12 h 12 min
5:58 AM – 6:12 PM
Cloud cover
60%
8th clearest
Wind
7 km/h
10th windiest
Solar energy
4.13 kWh/m²
Travel score
6.0
out of 10

Sīāhkal is city in Gilan 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 28°C in the first days to 25°C by the end.

A typical September day in Sīāhkal reaches about 26°C in the afternoon and slips back to 19°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 22°C and 30°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)
12821
22820
32820
42820
52820
62820
72720
82720
92720
102719
112719
122719
132719
142719
152619
162619
172618
182618
192618
202618
212618
222518
232518
242517
252517
262517
272517
282517
292417
302417

How September really feels in Sīāhkal

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.

Sīāhkal weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan12° / 11611.21.69.73.0
Feb12° / 11711.62.210.63.0
Mar15° / 10913.10.411.74.3
Apr19° / 11°7710.6012.95.9
May24° / 15°478.50147.0
Jun28° / 19°667.7014.56.7
Jul30° / 22°768.7014.35.4
Aug30° / 22°9610.6013.45.2
Sep26° / 19°16913.8012.36.0
Oct22° / 14°18814.60116.0
Nov17° / 10°17813.20.3105.0
Dec14° / 12511.30.69.53.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 30% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 14% of September, with mostly cloudy or overcast conditions the remaining 56%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14852
24753
34753
44852
54753
64654
74654
84753
94654
104654
114654
124654
134555
144654
154456
164555
174357
184357
194456
204258
214258
224258
234258
244357
254357
264357
274357
284258
294258
304258

Chance of precipitation in September

Any precipitation

Sīāhkal gets around 169 mm of rain over 13.8 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 46% and peaks near 50% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
141
242
342
443
543
644
744
844
945
1045
1145
1245
1345
1445
1546
1646
1746
1846
1947
2047
2147
2247
2348
2448
2548
2649
2749
2849
2950
3050

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the muggy band about 50% of days. Sticky, muggy-or-worse air turns up on roughly 70% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1011149337
2011249326
3011348326
4011548315
5011648305
6011748294
7011849284
8011949273
9012051262
10012151252
11012253231
12012353221
13012453211
14022454191
15022555180
16022557160
17032656150
18032756140
19032757130
20042856120
21053054110
22063153100
2307325290
2408335180
2509354970
26110364760
27111384460
28112394250
29214403950
30215423640

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
206calm
216calm
226calm
236calm
246calm
257calm
267calm
277calm
287calm
297calm
307calm

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 5:45 AM to 6:10 AM, and sunset from 6:35 PM to 5:50 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:456:35
212.85:466:34
312.85:476:32
412.75:486:31
512.75:496:29
612.65:496:28
712.65:506:26
812.65:516:25
912.55:526:23
1012.55:536:21
1112.45:546:20
1212.45:546:18
1312.45:556:17
1412.35:566:15
1512.35:576:13
1612.25:586:12
1712.25:596:10
1812.26:006:09
1912.16:006:07
2012.16:016:05
2112.06:026:04
2212.06:036:02
2311.96:046:01
2411.96:055:59
2511.96:065:58
2611.86:065:56
2711.86:075:54
2811.76:085:53
2911.76:095:51
3011.76:105:50

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.13 kWh/m².

For context, solar energy here swings from a low near 2.07 kWh/m² to a high of 6.29 kWh/m² in June across the year — September's 4.13 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.8Bright
24.7Bright
34.7Bright
44.6Bright
54.6Bright
64.5Bright
74.5Bright
84.4Bright
94.4Bright
104.3Bright
114.3Bright
124.3Bright
134.2Bright
144.2Bright
154.1Bright
164.1Bright
174.0Bright
184.0Bright
194.0Moderate
204.0Moderate
213.9Moderate
223.9Moderate
233.9Moderate
243.8Moderate
253.8Moderate
263.8Moderate
273.7Moderate
283.7Moderate
293.7Moderate
303.6Moderate
Planning a trip in September

Is September a good time to visit Sīāhkal?

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

6.0
Sightseeing
3rd-best month of the year
5.9
Beach & pool
4th-best month of the year

September is a reasonable time to visit Sīāhkal for sightseeing.

What to pack for Sīāhkal in September

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

In September, Sīāhkal sees daytime highs around 26°C and nights near 19°C. Pack rain gear. Worth having: light clothes. About 14 days see rain.

rain gearlight clothes

Sea temperature near Sīāhkal in September

The nearest coast averages about 26°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 33 km away) is warmest in August at about 28°C and coldest in February near 10°C.

It's comfortable for a long swim from May 24 to Nov 4 — about 5.4 months when the water holds above 20°C.

10°20°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan12Bracing
Feb10Bracing
Mar11Bracing
Apr13Bracing
May19Cool
Jun24Warm
Jul27Warm
Aug28Warm
Sep26Warm
Oct23Refreshing
Nov19Cool
Dec15Bracing

UV index in Sīāhkal in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Sīāhkal peaks around July 17 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 11 at about 2 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateJul 17UV 9Jan 11UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar4Moderate
Apr6High
May8Very high
Jun8Very high
Jul9Very high
Aug8Very high
Sep6High
Oct5Moderate
Nov3Moderate
Dec2Moderate

Air quality in Sīāhkal 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 Sīāhkal is worst in March — around 27 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (July, 14 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateMar 1826 µg/m³Jul 1315 µg/m³
PM2.5 (µg/m³)Level
Jan21Moderate
Feb21Moderate
Mar27Moderate
Apr23Moderate
May21Moderate
Jun17Moderate
Jul14Moderate
Aug20Moderate
Sep25Moderate
Oct23Moderate
Nov21Moderate
Dec20Moderate
Location & terrain

Where is Sīāhkal?

Sīāhkal sits at 37.2°N, 49.9°E, 47 m above sea level, in Iran. The nearest listed city is Lāhījān, 13 km away.

Topography around Sīāhkal

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

Within 3 km, the terrain around Sīāhkal has only modest variations in elevation — a maximum elevation change of 148 m around an average of 44 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,255 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,710 m.

The land around Sīāhkal is covered by trees (40%) and cropland (39%) within 3 km, trees (56%) and cropland (34%) within 16 km, and water (35%), trees (25%) and grassland (25%) within 80 km.

3 km
148 m
16 km
1,255 m
80 km
3,710 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: Lāhījān 13 km · Āstāneh-ye Ashrafīyeh 14 km · Langarūd 25 km · Rasht 29 km · Amlash 29 km · Khomām 32 km · Rūdsar 37 km · Fūman 50 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 Sīāhkal (37.1533°, 49.8714°, elevation 47 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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).