Chālūs weather in September

In September, Chālūs sees average daytime highs of 25°C and overnight lows near 22°C, with 148 mm of rain across 14.6 wet days and about 12.2 hours of daylight. It is the 3rd-warmest and 4th-wettest month of the year here.

Highs ease over the month, from about 26°C in the first days to 24°C by the end. The sky is clear or mostly clear about 41% 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 Chālūs's 4th-clearest and 6th-windiest month. For the whole year in context, see Chālūs's year-round climate.

Daytime high
25°
3rd warmest
Overnight low
22°
10th coldest
Rainfall
148 mm
14.6 wet days
Daylight
12 h 12 min
5:52 AM – 6:06 PM
Cloud cover
49%
4th clearest
Wind
9 km/h
6th windiest
Solar energy
4.38 kWh/m²
Travel score
6.3
out of 10

Chālūs 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 24°C by the end.

A typical September day in Chālūs reaches about 25°C in the afternoon and slips back to 22°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 22°C and 28°C. Set against its neighbours, September runs about 2°C cooler than August and about 3°C warmer than October.

15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12724
22724
32624
42624
52623
62623
72623
82623
92623
102623
112623
122623
132523
142522
152522
162522
172522
182522
192522
202522
212522
222422
232421
242421
252421
262421
272421
282421
292421
302421

Chālūs weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan12° / 14215.20.79.82.6
Feb11° / 12314.1110.62.5
Mar13° / 10014.10.111.73.3
Apr17° / 13°6811.3012.95.1
May21° / 18°489.8013.96.6
Jun25° / 22°498.5014.57.4
Jul27° / 24°5910.8014.36.8
Aug27° / 25°6011.2013.46.6
Sep25° / 22°14814.6012.26.3
Oct22° / 19°20515.2011.15.9
Nov17° / 14°21915.80.1104.7
Dec14° / 11°15614.809.53.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 41% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 21% of September, with mostly cloudy or overcast conditions the remaining 38%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16535
26535
36535
46337
56337
66238
76238
86238
96139
106139
116139
126139
136139
146040
156139
166040
176139
186139
196139
206139
216238
226139
236238
246139
256238
266238
276139
286139
296139
306139

Chance of precipitation in September

Any precipitation

Chālūs gets around 148 mm of rain over 14.6 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 48% and peaks near 51% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
144
244
345
445
545
646
746
846
947
1047
1147
1248
1348
1448
1549
1649
1749
1849
1950
2050
2150
2250
2350
2450
2550
2650
2750
2851
2951
3051

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 36% of days. Sticky, muggy-or-worse air turns up on roughly 78% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1008284025
2008284024
3008294022
4019294021
5019304119
60110314118
70111324116
80111324114
90112334112
100113344111
11011435419
12021536408
13021536407
14021637395
15021738394
16021838383
17031939373
18032039372
19032139361
20032239351
21042339331
22042340330
23052439310
24062539290
25072639280
26172639260
27182739250
28192839230
292102839210
302112938200

Wind in September

Winds average 9 km/h in September.

Across September, daily wind ranges from about 9 km/h on the calmest days to 10 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
19calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm

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 5:39 AM to 6:04 AM, and sunset from 6:29 PM to 5:44 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:396:29
212.85:406:27
312.75:416:26
412.75:426:24
512.75:436:23
612.65:446:21
712.65:446:20
812.55:456:18
912.55:466:16
1012.55:476:15
1112.45:486:13
1212.45:486:12
1312.35:496:10
1412.35:506:09
1512.35:516:07
1612.25:526:06
1712.25:536:04
1812.25:536:02
1912.15:546:01
2012.15:555:59
2112.05:565:58
2212.05:575:56
2311.95:585:55
2411.95:585:53
2511.95:595:51
2611.86:005:50
2711.86:015:48
2811.86:025:47
2911.76:035:45
3011.76:045:44

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.38 kWh/m².

For context, solar energy here swings from a low near 2 kWh/m² to a high of 6.42 kWh/m² in June across the year — September's 4.38 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.0Bright
25.0Bright
34.9Bright
44.9Bright
54.8Bright
64.8Bright
74.7Bright
84.7Bright
94.6Bright
104.6Bright
114.5Bright
124.5Bright
134.5Bright
144.4Bright
154.4Bright
164.3Bright
174.3Bright
184.3Bright
194.2Bright
204.2Bright
214.2Bright
224.1Bright
234.1Bright
244.1Bright
254.0Bright
264.0Bright
274.0Moderate
283.9Moderate
293.9Moderate
303.9Moderate
Planning a trip in September

Hazard calendar for Chālūs

In seasonPeak

In September, Chālūs sits inside its rainy season season. The full year is below, with each hazard's peak months called out.

Chālūs's rainy season runs September–March, when most of the year's rain falls.

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

Is September a good time to visit Chālūs?

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

6.3
Sightseeing
5th-best month of the year
5.7
Beach & pool
4th-best month of the year

September is a reasonable time to visit Chālūs for sightseeing.

What to pack for Chālūs in September

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

In September, Chālūs sees daytime highs around 25°C and nights near 22°C. Pack rain gear. Worth having: light clothes. About 15 days see rain.

rain gearlight clothes

Sea temperature near Chālūs 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 19 km away) is warmest in August at about 28°C and coldest in February near 11°C.

It's comfortable for a long swim from May 21 to Nov 7 — about 5.6 months when the water holds above 20°C.

10°20°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan12Bracing
Feb11Bracing
Mar11Bracing
Apr14Bracing
May19Cool
Jun24Warm
Jul27Warm
Aug28Tropical
Sep26Warm
Oct23Refreshing
Nov19Cool
Dec15Cool

UV index in Chālūs 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 Chālūs peaks around July 17 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 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 1UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar4Moderate
Apr6High
May8Very high
Jun8Very high
Jul9Very high
Aug8Very high
Sep6High
Oct4Moderate
Nov3Moderate
Dec2Moderate

Air quality in Chālūs 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 Chālūs is worst in February — around 46 µg/m³ PM2.5 (poor), about 3.0× the cleanest month (July, 15 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecPoorModerateFeb 1545 µg/m³Jul 1716 µg/m³
PM2.5 (µg/m³)Level
Jan42Poor
Feb46Poor
Mar42Poor
Apr36Poor
May31Moderate
Jun21Moderate
Jul15Moderate
Aug20Moderate
Sep27Moderate
Oct30Moderate
Nov32Moderate
Dec36Poor
Location & terrain

Where is Chālūs?

Chālūs sits at 36.7°N, 51.4°E, 26 m above sea level, in Iran. The nearest listed city is Nowshahr, 7.0 km away.

Topography around Chālūs

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

Within 3 km, the terrain around Chālūs has significant variations in elevation — a maximum elevation change of 284 m around an average of 33 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,846 m; within 80 km, extreme variations in elevation — a maximum elevation change of 4,754 m.

The land around Chālūs is covered by artificial surfaces (40%) and trees (39%) within 3 km, trees (47%) and water (42%) within 16 km, and water (46%), grassland (26%) and trees (21%) within 80 km.

3 km
284 m
16 km
1,846 m
80 km
4,754 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Nowshahr 7.0 km · Tonekābon 52 km · Nūr 54 km · Katālem va Sādāt Shahr 70 km · Rāmsar 75 km · Maḩmūdābād 75 km · Āmol 86 km · Tajrīsh 95 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 Chālūs (36.655°, 51.4204°, elevation 26 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).