San Juan de los Lagos weather in September

In September, San Juan de los Lagos sees average daytime highs of 26°C and overnight lows near 15°C, with 111 mm of rain across 15.2 wet days and about 12.1 hours of daylight. It is the 8th-warmest and 4th-wettest month of the year here.

Day-to-day highs hold fairly steady near 26°C through the month. The sky is clear or mostly clear about 22% 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 San Juan de los Lagos's 12th-clearest and 10th-windiest month. For the whole year in context, see San Juan de los Lagos's year-round climate.

Daytime high
26°
8th warmest
Overnight low
15°
8th coldest
Rainfall
111 mm
15.2 wet days
Daylight
12 h 06 min
6:40 AM – 6:47 PM
Cloud cover
64%
12th clearest
Wind
8 km/h
10th windiest
Solar energy
5.67 kWh/m²
Travel score
5.7
out of 10

San Juan de los Lagos is municipal seat of San Juan, State of Jalisco, Mexico.

Density
56/km²
people per km²
Founded
1542

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 26°C through the month.

A typical September day in San Juan de los Lagos reaches about 26°C in the afternoon and slips back to 15°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 29°C. Set against its neighbours, September runs on par with August and on par with October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12616
22616
32616
42616
52616
62616
72616
82616
92616
102616
112616
122616
132616
142616
152615
162615
172615
182615
192615
202615
212615
222615
232615
242615
252615
262615
272615
282615
292615
302715

San Juan de los Lagos weather by month

How September compares with the rest of the year at a glance. September is the 8th-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan23° / 16210.98.5
Feb25° / 10°101.611.38.6
Mar28° / 12°71.111.87.9
Apr30° / 14°50.912.56.2
May31° / 17°245.1135.1
Jun30° / 17°11513.813.34.8
Jul27° / 16°15319.813.25.2
Aug27° / 16°13718.212.75.4
Sep26° / 15°11115.212.15.7
Oct27° / 14°406.711.57.3
Nov25° / 11°102.2118.5
Dec24° / 71.110.78.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 22% of the time in September, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 23% of September, with mostly cloudy or overcast conditions the remaining 55%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14654
24555
34456
44456
54357
64357
74357
84258
94258
104357
114456
124456
134456
144456
154456
164555
174555
184555
194555
204555
214555
224654
234654
244753
254753
264852
274852
284951
295149
305149

Chance of precipitation in September

Any precipitation

San Juan de los Lagos gets around 111 mm of rain over 15.2 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 50% and peaks near 60% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
160
260
359
459
559
658
758
857
957
1056
1155
1254
1354
1453
1552
1651
1750
1850
1949
2047
2146
2245
2344
2443
2541
2640
2739
2838
2937
3036

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 51% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
1166024
2165925
3175825
4175726
5185626
6185626
7195526
8195526
9205426
10215326
11225226
12225226
13235126
14245125
15255025
16255124
17265123
18275122
19285121
20295120
21315019
22334918
23344817
24364716
25384615
26404614
27424513
28444412
29464311
30474310

Wind in September

Winds average 8 km/h in September.

Across September, daily wind ranges from about 8 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
299calm
309calm

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 6:36 AM to 6:44 AM, and sunset from 7:02 PM to 6:33 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.46:367:02
212.46:367:01
312.46:377:00
412.46:376:59
512.36:376:58
612.36:386:57
712.36:386:56
812.36:386:55
912.36:386:54
1012.26:396:53
1112.26:396:52
1212.26:396:51
1312.26:396:50
1412.26:406:49
1512.16:406:48
1612.16:406:47
1712.16:406:46
1812.16:416:45
1912.16:416:44
2012.06:416:43
2112.06:416:42
2212.06:426:41
2312.06:426:40
2412.06:426:39
2511.96:426:38
2611.96:436:37
2711.96:436:36
2811.96:436:35
2911.86:446:34
3011.86:446:33

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.67 kWh/m².

For context, solar energy here swings from a low near 4.81 kWh/m² to a high of 7.7 kWh/m² in May across the year — September's 5.67 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.9Bright
25.9Bright
35.9Bright
45.8Bright
55.8Bright
65.8Bright
75.8Bright
85.8Bright
95.8Bright
105.8Bright
115.7Bright
125.7Bright
135.7Bright
145.7Bright
155.7Bright
165.7Bright
175.7Bright
185.7Bright
195.7Bright
205.7Bright
215.7Bright
225.6Bright
235.6Bright
245.6Bright
255.6Bright
265.6Bright
275.6Bright
285.6Bright
295.6Bright
305.6Bright
Planning a trip in September

Hazard calendar for San Juan de los Lagos

In seasonPeak

In September, San Juan de los Lagos sits inside its rainy season season. The full year is below, with each hazard's peak months called out.

San Juan de los Lagos's rainy season runs June–September, 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 San Juan de los Lagos?

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

5.7
Sightseeing
8th-best month of the year
5.6
Beach & pool
10th-best month of the year

September is a reasonable time to visit San Juan de los Lagos for sightseeing.

What to pack for San Juan de los Lagos in September

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

In September, San Juan de los Lagos sees daytime highs around 26°C and nights near 15°C. Pack rain gear. Worth having: light clothes and sun protection. About 15 days see rain.

rain gearlight clothessun protection

UV index in San Juan de los Lagos in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 12 (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 Juan de los Lagos peaks around May 14 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 7 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highMay 14UV 14Dec 15UV 7
UV index (midday)Level
Jan8Very high
Feb10Extreme
Mar13Extreme
Apr14Extreme
May14Extreme
Jun14Extreme
Jul13Extreme
Aug13Extreme
Sep12Extreme
Oct10Extreme
Nov8Very high
Dec7High

Air quality in San Juan de los Lagos 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 Juan de los Lagos is worst in May — around 21 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateMay 1420 µg/m³Oct 1814 µg/m³
PM2.5 (µg/m³)Level
Jan18Moderate
Feb17Moderate
Mar16Moderate
Apr17Moderate
May21Moderate
Jun15Moderate
Jul16Moderate
Aug15Moderate
Sep17Moderate
Oct14Moderate
Nov16Moderate
Dec20Moderate
Location & terrain

Where is San Juan de los Lagos?

San Juan de los Lagos sits at 21.2°N, 102.3°W, 1,749 m above sea level, in Mexico. The nearest listed city is Jalostotitlán, 16 km away.

Topography around San Juan de los Lagos

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

Within 3 km, the terrain around San Juan de los Lagos has only modest variations in elevation — a maximum elevation change of 175 m around an average of 1,767 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 356 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,615 m.

The land around San Juan de los Lagos is covered by artificial surfaces (31%), shrubs (24%) and cropland (20%) within 3 km, shrubs (40%) and cropland (40%) within 16 km, and shrubs (42%) and cropland (27%) within 80 km.

3 km
175 m
16 km
356 m
80 km
1,615 m
treesshrubsgrasslandcroplandartificial surfacesbare terrain
September weather nearby: Jalostotitlán 16 km · San Miguel el Alto 25 km · Encarnación de Díaz 32 km · Teocaltiche 33 km · Lagos de Moreno 43 km · Purísima de Bustos 53 km · Villa Hidalgo 54 km · Nochistlán de Mejía 55 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 Juan de los Lagos (21.2489°, -102.3304°, elevation 1,749 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).