Lavāsān weather in September

In September, Lavāsān sees average daytime highs of 24°C and overnight lows near 16°C, with 6 mm of rain across 1.3 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 26°C in the first days to 21°C by the end. The sky is clear or mostly clear about 92% 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 Lavāsān's 1st-clearest and 5th-windiest month. For the whole year in context, see Lavāsān's year-round climate.

Daytime high: 24°; 4th warmest
Overnight low: 16°; 9th coldest
Rainfall: 6 mm; 1.3 wet days
Daylight: 12 h 12 min; 5:51 AM – 6:04 PM
Cloud cover: 10%; 1st clearest
Wind: 7 km/h; 5th windiest
Solar energy: 5.9 kWh/m²
Travel score: 9.1; out of 10

Lavāsān is city in Tehran Province, Iran.

Air quality: Elevated; PM2.5 24.7 µg/m³ · 2016

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

← August Lavāsān 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 26°C in the first days to 21°C by the end.

A typical September day in Lavāsān 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 21°C and 27°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)	27	26	26	26	26	26	26	26	25	25	25	25	25	24	24	24	24	24	23	23	23	23	23	22	22	22	22	21	21	21
Avg low (°C)	18	18	18	18	18	17	17	17	17	17	17	17	16	16	16	16	16	15	15	15	15	15	14	14	14	14	14	13	13	13

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

How September really feels in Lavāsān

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.

Lavāsān 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	-0° / -8°	36	6.9	6.8	9.8	0.0
Feb	1° / -6°	44	7.7	7.4	10.6	0.0
Mar	7° / -1°	59	9.4	6.1	11.7	0.8
Apr	13° / 6°	50	9.7	1.2	12.9	3.9
May	20° / 12°	24	5.2	0.2	13.9	7.3
Jun	27° / 18°	7	1.7	0	14.4	8.6
Jul	30° / 21°	5	1.3	0	14.2	7.0
Aug	28° / 20°	5	1.1	0	13.4	7.9
Sep	24° / 16°	6	1.3	0	12.2	9.1
Oct	17° / 9°	20	4	0.1	11.1	6.7
Nov	8° / 1°	40	6.9	3.5	10.1	1.8
Dec	3° / -6°	36	6.9	6.2	9.6	0.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 92% 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%.

	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	98	98	98	98	98	98	98	98	98	98	98	98	97	97	97	97	96	96	96	95	95	94
Cloudier (%)	1	1	1	1	1	1	1	1	2	2	2	2	2	2	2	2	2	2	2	2	3	3	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	98	2
10	98	2
11	98	2
12	98	2
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	97	3
22	97	3
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

Lavāsān gets around 6 mm of rain over 1.3 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 5% and peaks near 7% 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 (%)	5	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	5	5	5	5	5	5	5	5	5	5	6	6	6	7

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

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 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.

	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)	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	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	7	calm
2	7	calm
3	7	calm
4	7	calm
5	7	calm
6	7	calm
7	7	calm
8	7	calm
9	7	calm
10	7	calm
11	7	calm
12	7	calm
13	7	calm
14	7	calm
15	7	calm
16	7	calm
17	7	calm
18	7	calm
19	7	calm
20	7	calm
21	7	calm
22	7	calm
23	7	calm
24	7	calm
25	7	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 5:39 AM to 6:02 AM, and sunset from 6:27 PM to 5:43 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)	5:39	5:40	5:41	5:42	5:42	5:43	5:44	5:45	5:46	5:46	5:47	5:48	5:49	5:49	5:50	5:51	5:52	5:53	5:53	5:54	5:55	5:56	5:57	5:57	5:58	5:59	6:00	6:01	6:01	6:02
Sunset (PM)	6:27	6:26	6:24	6:23	6:21	6:20	6:18	6:17	6:15	6:14	6:12	6:11	6:09	6:08	6:06	6:04	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

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.8	5:39	6:27
2	12.8	5:40	6:26
3	12.7	5:41	6:24
4	12.7	5:42	6:23
5	12.6	5:42	6:21
6	12.6	5:43	6:20
7	12.6	5:44	6:18
8	12.5	5:45	6:17
9	12.5	5:46	6:15
10	12.5	5:46	6:14
11	12.4	5:47	6:12
12	12.4	5:48	6:11
13	12.3	5:49	6:09
14	12.3	5:49	6:08
15	12.3	5:50	6:06
16	12.2	5:51	6:04
17	12.2	5:52	6:03
18	12.1	5:53	6:01
19	12.1	5:53	6:00
20	12.1	5:54	5:58
21	12.0	5:55	5:57
22	12.0	5:56	5:55
23	12.0	5:57	5:54
24	11.9	5:57	5:52
25	11.9	5:58	5:51
26	11.8	5:59	5:49
27	11.8	6:00	5:48
28	11.8	6:01	5:46
29	11.7	6:01	5:45
30	11.7	6:02	5:43

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.9 kWh/m².

For context, solar energy here swings from a low near 2.94 kWh/m² to a high of 7.6 kWh/m² in June across the year — September's 5.9 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	6.4	6.4	6.4	6.3	6.3	6.3	6.2	6.2	6.1	6.1	6.0	6.0	6.0	5.9	5.9	5.8	5.8	5.7	5.7	5.7	5.6	5.6	5.5	5.5	5.4	5.4	5.3	5.3	5.2
Level	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	Bright

	Solar energy (kWh/m²)	Level
1	6.5	Intense
2	6.4	Intense
3	6.4	Intense
4	6.4	Intense
5	6.3	Intense
6	6.3	Intense
7	6.3	Intense
8	6.2	Intense
9	6.2	Intense
10	6.1	Intense
11	6.1	Intense
12	6.0	Intense
13	6.0	Intense
14	6.0	Bright
15	5.9	Bright
16	5.9	Bright
17	5.8	Bright
18	5.8	Bright
19	5.7	Bright
20	5.7	Bright
21	5.7	Bright
22	5.6	Bright
23	5.6	Bright
24	5.5	Bright
25	5.5	Bright
26	5.4	Bright
27	5.4	Bright
28	5.3	Bright
29	5.3	Bright
30	5.2	Bright

Planning a trip in September

Is September a good time to visit Lavāsān?

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

9.1

Sightseeing

1st-best month of the year

7.4

Beach & pool

4th-best month of the year

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

What to pack for Lavāsān in September

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

In September, Lavāsān sees daytime highs around 24°C and nights near 16°C. Worth packing: light clothes and sun protection.

light clothessun protection

UV index in Lavāsān 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 Lavāsān peaks around July 19 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 4 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	4	5	6	8	10	10	12	11	8	6	4	4
Level	Moderate	High	High	Very high	Extreme	Extreme	Extreme	Extreme	Very high	High	Moderate	Moderate

	UV index (midday)	Level
Jan	4	Moderate
Feb	5	High
Mar	6	High
Apr	8	Very high
May	10	Extreme
Jun	10	Extreme
Jul	12	Extreme
Aug	11	Extreme
Sep	8	Very high
Oct	6	High
Nov	4	Moderate
Dec	4	Moderate

Air quality in Lavāsān 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 Lavāsān is worst in January — around 37 µg/m³ PM2.5 (poor), about 3.1× the cleanest month (July, 12 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Lavāsān's WHO annual average of 24.7 µg/m³.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
PM2.5 (µg/m³)	37	34	28	25	21	16	12	14	19	25	30	36
Level	Poor	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Poor

	PM2.5 (µg/m³)	Level
Jan	37	Poor
Feb	34	Moderate
Mar	28	Moderate
Apr	25	Moderate
May	21	Moderate
Jun	16	Moderate
Jul	12	Moderate
Aug	14	Moderate
Sep	19	Moderate
Oct	25	Moderate
Nov	30	Moderate
Dec	36	Poor

Location & terrain

Where is Lavāsān?

Lavāsān sits at 35.8°N, 51.6°E, 1,681 m above sea level, in Iran. The nearest listed city is Pardīs, 17 km away.

Topography around Lavāsān

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

Within 3 km, the terrain around Lavāsān has large variations in elevation — a maximum elevation change of 782 m around an average of 1,780 m above sea level; within 16 km, extreme variations in elevation — a maximum elevation change of 2,600 m; within 80 km, extreme variations in elevation — a maximum elevation change of 5,452 m.

The land around Lavāsān is covered by grassland (44%) within 3 km, grassland (61%) within 16 km, and grassland (44%) and bare terrain (28%) within 80 km.

3 km

782 m

grassland 44%

16 km

2,600 m

grassland 61%

80 km

5,452 m

grassland 44%

treesshrubsgrasslandcroplandartificial surfacesbare terrainwater

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

September weather nearby: Pardīs 17 km · Vaḩīdīyeh 20 km · Tajrīsh 20 km · Būmahen 23 km · Tehran 25 km · Shahrak-e Qods 25 km · Rūdehen 26 km · Shahrak-e ‘Alā’īn 32 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 Lavāsān (35.8216°, 51.6444°, elevation 1,681 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	27	18
2	26	18
3	26	18
4	26	18
5	26	18
6	26	17
7	26	17
8	26	17
9	25	17
10	25	17
11	25	17
12	25	17
13	25	16
14	24	16
15	24	16
16	24	16
17	24	16
18	24	15
19	23	15
20	23	15
21	23	15
22	23	15
23	23	14
24	22	14
25	22	14
26	22	14
27	22	14
28	21	13
29	21	13
30	21	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	98	2
10	98	2
11	98	2
12	98	2
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	97	3
22	97	3
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	5
2	4
3	4
4	4
5	4
6	4
7	4
8	4
9	4
10	4
11	4
12	4
13	4
14	4
15	4
16	4
17	5
18	5
19	5
20	5
21	5
22	5
23	5
24	5
25	5
26	5
27	6
28	6
29	6
30	7

	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	27	18
2	26	18
3	26	18
4	26	18
5	26	18
6	26	17
7	26	17
8	26	17
9	25	17
10	25	17
11	25	17
12	25	17
13	25	16
14	24	16
15	24	16
16	24	16
17	24	16
18	24	15
19	23	15
20	23	15
21	23	15
22	23	15
23	23	14
24	22	14
25	22	14
26	22	14
27	22	14
28	21	13
29	21	13
30	21	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	98	2
10	98	2
11	98	2
12	98	2
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	97	3
22	97	3
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	5
2	4
3	4
4	4
5	4
6	4
7	4
8	4
9	4
10	4
11	4
12	4
13	4
14	4
15	4
16	4
17	5
18	5
19	5
20	5
21	5
22	5
23	5
24	5
25	5
26	5
27	6
28	6
29	6
30	7

	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	27	18
2	26	18
3	26	18
4	26	18
5	26	18
6	26	17
7	26	17
8	26	17
9	25	17
10	25	17
11	25	17
12	25	17
13	25	16
14	24	16
15	24	16
16	24	16
17	24	16
18	24	15
19	23	15
20	23	15
21	23	15
22	23	15
23	23	14
24	22	14
25	22	14
26	22	14
27	22	14
28	21	13
29	21	13
30	21	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	98	2
10	98	2
11	98	2
12	98	2
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	97	3
22	97	3
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	5
2	4
3	4
4	4
5	4
6	4
7	4
8	4
9	4
10	4
11	4
12	4
13	4
14	4
15	4
16	4
17	5
18	5
19	5
20	5
21	5
22	5
23	5
24	5
25	5
26	5
27	6
28	6
29	6
30	7

	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