San Nicolás de los Garza weather in September

In September, San Nicolás de los Garza sees average daytime highs of 30°C and overnight lows near 21°C, with 117 mm of rain across 10.4 wet days and about 12.2 hours of daylight. It is the 5th-warmest and 1st-wettest month of the year here.

Highs ease over the month, from about 32°C in the first days to 29°C by the end. The sky is clear or mostly clear about 43% of the time in September, and the air most often feels muggy.

Daylight stretches from about 12 h 30 min at the start of September to 11 h 48 min by month's end. Set against the rest of the year, September is San Nicolás de los Garza's 12th-clearest and 10th-windiest month. For the whole year in context, see San Nicolás de los Garza's year-round climate.

Daytime high
30°
5th warmest
Overnight low
21°
9th coldest
Rainfall
117 mm
10.4 wet days
Daylight
12 h 06 min
6:31 AM – 6:40 PM
Cloud cover
50%
12th clearest
Wind
7 km/h
10th windiest
Solar energy
5.26 kWh/m²
Travel score
4.9
out of 10

San Nicolás de los Garza is municipal seat of San Nicolás, State of Nuevo León, Mexico.

Density
6,870/km²
people per km²
Founded
1597

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 32°C in the first days to 29°C by the end.

A typical September day in San Nicolás de los Garza reaches about 30°C in the afternoon and slips back to 21°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 26°C and 35°C. Set against its neighbours, September runs about 3°C cooler than August and about 3°C warmer than October.

15°20°25°30°35°40°151015202530
Avg high (°C)Avg low (°C)
13222
23222
33222
43222
53222
63122
73122
83122
93122
103121
113121
123121
133121
143121
153021
163021
173021
183021
193021
203021
213020
223020
233020
243020
253020
262920
272920
282920
292919
302919

How September really feels in San Nicolás de los Garza

Once humidity and wind are folded in, September averages 15 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
15
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

San Nicolás de los Garza weather by month

How September compares with the rest of the year at a glance. September is the 5th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan20° / 376.310.67.0
Feb23° / 11°335.711.17.6
Mar26° / 14°467.111.87.5
Apr29° / 17°466.712.66.1
May31° / 20°527.713.24.7
Jun33° / 22°395.413.63.9
Jul34° / 23°414.713.43.6
Aug34° / 23°314.512.93.6
Sep30° / 21°11710.412.24.9
Oct27° / 17°597.211.47.0
Nov23° / 13°386.310.77.7
Dec20° / 10°325.710.47.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 43% of the time in September, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 16% of September, with mostly cloudy or overcast conditions the remaining 41%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16040
26040
35941
45842
55743
65644
75545
85545
95446
105446
115446
125446
135446
145545
155545
165545
175644
185743
195842
205941
216040
226238
236337
246535
256535
266733
276832
286832
297030
307030

Chance of precipitation in September

Any precipitation

San Nicolás de los Garza gets around 117 mm of rain over 10.4 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 33% and peaks near 38% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
132
233
334
435
536
637
737
838
938
1038
1138
1237
1337
1437
1536
1636
1735
1835
1934
2033
2132
2231
2330
2429
2528
2627
2727
2826
2926
3026

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 49% of days. Sticky, muggy-or-worse air turns up on roughly 72% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
113205422
213205323
314195224
424195124
524185125
624175225
724175126
824165226
924165226
1024155227
1124155227
1224155227
1325145227
1425145326
1526155126
1626155225
1727155224
1828155223
1939165023
2039164922
21410174821
22411174721
23512184620
24612194419
25613194418
26713204317
27813204216
28814214215
29914214214
301014214214

Wind in September

Winds average 7 km/h in September.

Across September, daily wind ranges from about 7 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
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 30 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 42 minutes over September. Sunrise moves from 6:25 AM to 6:37 AM, and sunset from 6:57 PM to 6:24 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.56:256:57
212.56:256:56
312.56:266:55
412.56:266:54
512.46:276:52
612.46:276:51
712.46:276:50
812.46:286:49
912.36:286:48
1012.36:296:47
1112.36:296:46
1212.36:296:45
1312.26:306:43
1412.26:306:42
1512.26:316:41
1612.16:316:40
1712.16:316:39
1812.16:326:38
1912.16:326:37
2012.06:336:35
2112.06:336:34
2212.06:346:33
2312.06:346:32
2411.96:346:31
2511.96:356:30
2611.96:356:29
2711.96:366:27
2811.86:366:26
2911.86:366:25
3011.86:376:24

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.26 kWh/m².

For context, solar energy here swings from a low near 3.66 kWh/m² to a high of 6.78 kWh/m² in June across the year — September's 5.26 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.7Bright
25.7Bright
35.6Bright
45.6Bright
55.5Bright
65.5Bright
75.4Bright
85.4Bright
95.4Bright
105.3Bright
115.3Bright
125.3Bright
135.3Bright
145.2Bright
155.2Bright
165.2Bright
175.2Bright
185.2Bright
195.2Bright
205.2Bright
215.2Bright
225.2Bright
235.2Bright
245.2Bright
255.2Bright
265.2Bright
275.2Bright
285.2Bright
295.2Bright
305.2Bright
Planning a trip in September

Is September a good time to visit San Nicolás de los Garza?

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

4.9
Sightseeing
8th-best month of the year
6.9
Beach & pool
8th-best month of the year

September is a reasonable time to visit San Nicolás de los Garza for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for San Nicolás de los Garza in September

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

In September, San Nicolás de los Garza sees daytime highs around 30°C and nights near 21°C. Pack light clothes. Worth having: rain gear and sun protection. About 10 days see rain.

light clothesrain gearsun protection

UV index in San Nicolás de los Garza 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 San Nicolás de los Garza peaks around June 17 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 18 at about 5 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecHighVery highExtremeVery highHighJun 17UV 12Dec 18UV 5
UV index (midday)Level
Jan6High
Feb8Very high
Mar10Very high
Apr12Extreme
May12Extreme
Jun12Extreme
Jul12Extreme
Aug12Extreme
Sep11Extreme
Oct8Very high
Nov6High
Dec5High

Air quality in San Nicolás de los Garza 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 San Nicolás de los Garza is worst in December — around 24 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateDec 1724 µg/m³Aug 1518 µg/m³
PM2.5 (µg/m³)Level
Jan23Moderate
Feb21Moderate
Mar24Moderate
Apr21Moderate
May22Moderate
Jun20Moderate
Jul19Moderate
Aug18Moderate
Sep20Moderate
Oct20Moderate
Nov22Moderate
Dec24Moderate
Location & terrain

Where is San Nicolás de los Garza?

San Nicolás de los Garza sits at 25.7°N, 100.3°W, 510 m above sea level, in Mexico. The nearest listed city is Ciudad General Escobedo, 6.0 km away.

Topography around San Nicolás de los Garza

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of San Nicolás de los Garza.

Within 3 km, the terrain around San Nicolás de los Garza has significant variations in elevation — a maximum elevation change of 399 m around an average of 518 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,549 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,524 m.

The land around San Nicolás de los Garza is covered by artificial surfaces (87%) within 3 km, artificial surfaces (58%) and trees (20%) within 16 km, and shrubs (57%) and trees (29%) within 80 km.

3 km
399 m
16 km
1,549 m
80 km
3,524 m
treesshrubsgrasslandcroplandartificial surfacesbare terrain
September weather nearby: Ciudad General Escobedo 6.0 km · Monterrey 7.0 km · Guadalupe 8.0 km · Ciudad Apodaca 12 km · Mitras Poniente 13 km · San Pedro Garza García 13 km · Parque Industrial Ciudad Mitras 15 km · Jardines de la Silla 17 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 San Nicolás de los Garza (25.7417°, -100.3022°, elevation 510 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).