Ixtapan de la Sal weather in September

In September, Ixtapan de la Sal sees average daytime highs of 25°C and overnight lows near 15°C, with 237 mm of rain across 26.3 wet days and about 12.1 hours of daylight. It is the 10th-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 25°C through the month. The sky is clear or mostly clear about 6% of the time in September, and the air most often feels comfortable.

Daylight stretches from about 12 h 24 min at the start of September to 11 h 48 min by month's end. Set against the rest of the year, September is Ixtapan de la Sal's 12th-clearest and 12th-windiest month. For the whole year in context, see Ixtapan de la Sal's year-round climate.

Daytime high
25°
10th warmest
Overnight low
15°
8th coldest
Rainfall
237 mm
26.3 wet days
Daylight
12 h 06 min
6:30 AM – 6:36 PM
Cloud cover
79%
12th clearest
Wind
4 km/h
12th windiest
Solar energy
5.09 kWh/m²
Travel score
4.1
out of 10

Ixtapan de la Sal is municipal seat of Ixtapan de la Sal, State of México, Mexico.

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 25°C through the month.

A typical September day in Ixtapan de la Sal reaches about 25°C in the afternoon and slips back to 15°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 23°C and 26°C. Set against its neighbours, September runs about 1°C cooler than August and on par with October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12515
22515
32515
42515
52515
62515
72515
82515
92515
102515
112515
122515
132515
142515
152515
162515
172515
182515
192515
202515
212515
222515
232515
242515
252515
262515
272515
282515
292515
302515

Ixtapan de la Sal weather by month

How September compares with the rest of the year at a glance. September is the 10th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan24° / 10°152.3118.7
Feb26° / 11°122.211.48.5
Mar28° / 12°15311.97.8
Apr29° / 14°244.712.46.2
May29° / 15°1151512.95.1
Jun26° / 16°24725.113.14.2
Jul25° / 15°18623.3134.6
Aug25° / 15°22825.712.64.3
Sep25° / 15°23726.312.14.1
Oct25° / 14°1141911.65.4
Nov25° / 12°31711.17.7
Dec24° / 10°81.610.98.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 6% of the time in September, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 12% of September, with mostly cloudy or overcast conditions the remaining 82%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
11783
21585
31585
41585
51585
61585
71585
81585
91585
101585
111684
121783
131783
141783
151882
161882
171882
181882
191882
201882
211882
221981
232080
242080
252080
262080
272179
282179
292278
302377

Chance of precipitation in September

Any precipitation

Ixtapan de la Sal gets around 237 mm of rain over 26.3 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 87% and peaks near 91% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%100%151015202530
Rain chance (%)
190
290
390
491
591
690
790
890
989
1089
1189
1288
1388
1487
1587
1687
1787
1886
1986
2086
2186
2286
2385
2485
2584
2684
2783
2882
2982
3081

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the comfortable band about 55% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
145442
245442
335542
435542
535542
625642
725642
825642
925741
1025741
1135641
1235740
1335740
1435740
1535740
1635740
1735740
1835740
1945640
2045541
2145541
2245541
2355441
2455441
2565440
2665440
2775439
2875538
2985438
3095437

Wind in September

Winds average 4 km/h in September, the calmest month.

Across September, daily wind ranges from about 4 km/h on the calmest days to 4 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
14calm
24calm
34calm
44calm
54calm
64calm
74calm
84calm
94calm
104calm
114calm
124calm
134calm
144calm
154calm
164calm
174calm
184calm
194calm
204calm
214calm
224calm
234calm
244calm
254calm
264calm
274calm
284calm
294calm
304calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 24 min at the start of September to 11 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 36 minutes over September. Sunrise moves from 6:27 AM to 6:33 AM, and sunset from 6:50 PM to 6:23 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.46:276:50
212.46:276:49
312.36:286:48
412.36:286:47
512.36:286:46
612.36:286:45
712.36:286:44
812.36:286:44
912.26:296:43
1012.26:296:42
1112.26:296:41
1212.26:296:40
1312.26:296:39
1412.16:306:38
1512.16:306:37
1612.16:306:36
1712.16:306:35
1812.16:306:34
1912.16:306:33
2012.06:316:33
2112.06:316:32
2212.06:316:31
2312.06:316:30
2412.06:316:29
2511.96:326:28
2611.96:326:27
2711.96:326:26
2811.96:326:25
2911.96:326:24
3011.86:336:23

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.09 kWh/m².

For context, solar energy here swings from a low near 5.03 kWh/m² to a high of 7.47 kWh/m² in April across the year — September's 5.09 kWh/m² sits near the bottom.

0246151015202530
Solar energy (kWh/m²)Level
15.3Bright
25.3Bright
35.3Bright
45.3Bright
55.2Bright
65.2Bright
75.2Bright
85.2Bright
95.2Bright
105.2Bright
115.2Bright
125.2Bright
135.2Bright
145.2Bright
155.2Bright
165.1Bright
175.1Bright
185.1Bright
195.1Bright
205.1Bright
215.1Bright
225.1Bright
235.1Bright
245.0Bright
255.0Bright
265.0Bright
275.0Bright
285.0Bright
295.0Bright
305.0Bright
Planning a trip in September

Hazard calendar for Ixtapan de la Sal

In seasonPeak

In September, Ixtapan de la Sal sits inside its monsoon season. The full year is below, with each hazard's peak months called out.

Ixtapan de la Sal's monsoon runs May–October, when most of the year's rain falls.

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

Is September a good time to visit Ixtapan de la Sal?

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

4.1
Sightseeing
12th-best month of the year
3.7
Beach & pool
12th-best month of the year

September is a reasonable time to visit Ixtapan de la Sal for sightseeing.

What to pack for Ixtapan de la Sal in September

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

In September, Ixtapan de la Sal sees daytime highs around 25°C and nights near 15°C. Pack rain gear. Worth having: light clothes and sun protection. About 26 days see rain.

rain gearlight clothessun protection

UV index in Ixtapan de la Sal in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Ixtapan de la Sal peaks around April 9 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 14 at about 8 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highApr 9UV 14Dec 14UV 8
UV index (midday)Level
Jan9Very high
Feb12Extreme
Mar14Extreme
Apr14Extreme
May12Extreme
Jun13Extreme
Jul12Extreme
Aug12Extreme
Sep11Extreme
Oct10Very high
Nov8Very high
Dec7Very high

Air quality in Ixtapan de la Sal 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 Ixtapan de la Sal is worst in November — around 50 µg/m³ PM2.5 (poor), about 2.1× the cleanest month (March, 24 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecPoorModeratePoorModeratePoorNov 1150 µg/m³Mar 1725 µg/m³
PM2.5 (µg/m³)Level
Jan38Poor
Feb30Moderate
Mar24Moderate
Apr30Moderate
May42Poor
Jun33Moderate
Jul34Moderate
Aug36Poor
Sep43Poor
Oct49Poor
Nov50Poor
Dec47Poor
Location & terrain

Where is Ixtapan de la Sal?

Ixtapan de la Sal sits at 18.8°N, 99.7°W, 1,871 m above sea level, in Mexico. The nearest listed city is Tenango de Arista, 30 km away.

Topography around Ixtapan de la Sal

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Ixtapan de la Sal.

Within 3 km, the terrain around Ixtapan de la Sal has significant variations in elevation — a maximum elevation change of 477 m around an average of 1,871 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,331 m; within 80 km, extreme variations in elevation — a maximum elevation change of 4,208 m.

The land around Ixtapan de la Sal is covered by trees (50%) and grassland (20%) within 3 km, trees (55%) within 16 km, and trees (48%) and shrubs (22%) within 80 km.

3 km
477 m
16 km
1,331 m
80 km
4,208 m
treesshrubsgrasslandcroplandartificial surfaceswater
September weather nearby: Tenango de Arista 30 km · Taxco de Alarcón 33 km · Santiago Tlacotepec 43 km · Capulhuac de Mirafuentes 45 km · Puente de Ixtla 46 km · San Jorge Pueblo Nuevo 46 km · Xalatlaco 46 km · Metepec 47 km

Mexico travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type A / B
120 / 127 V · 60 Hz
Prices
≈ 54% of US
price level, 2025
GDP per capita
$13,889
2025
Happiness
7.0 / 10
World Happiness, 2025
Safe drinking water
43%
of population, 2024
Homicide rate
24.9
per 100k, 2023
Road deaths
12.8
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Very low
EF EPI 440
Religion
Catholic 78%no religion 11%other Evangelical Churches 8%Jehovah Witness 1%

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 Ixtapan de la Sal (18.8437°, -99.6767°, elevation 1,871 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).