San José del Castillo weather in September

In September, San José del Castillo sees average daytime highs of 26°C and overnight lows near 17°C, with 130 mm of rain across 19.2 wet days and about 12.1 hours of daylight. It is the 7th-warmest and 3rd-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 13% of the time in September, and the air most often feels humid.

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 José del Castillo's 12th-clearest and 10th-windiest month. For the whole year in context, see San José del Castillo's year-round climate.

Daytime high
26°
7th warmest
Overnight low
17°
9th coldest
Rainfall
130 mm
19.2 wet days
Daylight
12 h 06 min
6:44 AM – 6:51 PM
Cloud cover
71%
12th clearest
Wind
5 km/h
10th windiest
Solar energy
5.32 kWh/m²
Travel score
5.1
out of 10

San José del Castillo is town in El Salto Municipality, State of Jalisco, 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 26°C through the month.

A typical September day in San José del Castillo reaches about 26°C in the afternoon and slips back to 17°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 28°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)
12617
22617
32617
42617
52617
62617
72617
82617
92617
102617
112617
122617
132617
142617
152617
162617
172617
182617
192617
202617
212617
222617
232617
242617
252617
262617
272617
282617
292617
302617

San José del Castillo weather by month

How September compares with the rest of the year at a glance. September is the 7th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan24° / 10°171.910.98.6
Feb26° / 12°111.711.38.5
Mar28° / 13°71.111.97.6
Apr31° / 15°41.212.55.9
May32° / 17°174.4134.9
Jun29° / 18°11318.113.24.2
Jul27° / 17°16724.613.14.4
Aug27° / 17°14522.912.74.6
Sep26° / 17°13019.212.15.1
Oct26° / 15°438.211.57.0
Nov26° / 13°122.1118.4
Dec24° / 11°61.210.88.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 13% of the time in September, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 20% of September, with mostly cloudy or overcast conditions the remaining 67%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
12872
22773
32773
42773
52773
62971
72971
82971
93169
103070
113169
123268
133367
143367
153565
163565
173565
183565
193565
203565
213664
223664
233664
243763
253862
263862
273862
283961
293961
304060

Chance of precipitation in September

Any precipitation

San José del Castillo gets around 130 mm of rain over 19.2 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 63% and peaks near 75% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%151015202530
Rain chance (%)
175
275
375
474
574
674
773
872
971
1070
1169
1268
1366
1465
1564
1663
1761
1860
1959
2058
2157
2256
2354
2453
2552
2650
2749
2848
2947
3046

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the humid band about 71% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1117811
2117811
3117811
4117811
5118801
6118801
7119791
8119791
9120781
10221761
11221761
12222751
13222751
14223741
15223741
16324721
17324721
18325711
19425701
20426691
21527671
22627661
23728641
24828640
25929620
261029610
271130590
281230580
291331560
301432540

Wind in September

Winds average 5 km/h in September.

Across September, daily wind ranges from about 5 km/h on the calmest days to 6 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm

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 6:40 AM to 6:47 AM, and sunset from 7:05 PM to 6:37 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.46:407:05
212.46:417:04
312.46:417:03
412.46:417:02
512.36:417:01
612.36:427:00
712.36:426:59
812.36:426:58
912.36:426:58
1012.26:426:57
1112.26:436:56
1212.26:436:55
1312.26:436:54
1412.26:436:53
1512.16:446:52
1612.16:446:51
1712.16:446:50
1812.16:446:49
1912.16:446:48
2012.06:456:47
2112.06:456:46
2212.06:456:45
2312.06:456:44
2412.06:466:43
2511.96:466:42
2611.96:466:41
2711.96:466:40
2811.96:476:39
2911.96:476:38
3011.86:476:37

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.32 kWh/m².

For context, solar energy here swings from a low near 4.76 kWh/m² to a high of 7.58 kWh/m² in April across the year — September's 5.32 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.5Bright
25.5Bright
35.4Bright
45.4Bright
55.4Bright
65.4Bright
75.4Bright
85.4Bright
95.4Bright
105.4Bright
115.4Bright
125.4Bright
135.4Bright
145.4Bright
155.4Bright
165.3Bright
175.3Bright
185.3Bright
195.3Bright
205.3Bright
215.3Bright
225.3Bright
235.3Bright
245.3Bright
255.3Bright
265.3Bright
275.3Bright
285.3Bright
295.3Bright
305.3Bright
Planning a trip in September

Hazard calendar for San José del Castillo

In seasonPeak

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

San José del Castillo'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 José del Castillo?

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

5.1
Sightseeing
8th-best month of the year
5.0
Beach & pool
10th-best month of the year

September is a reasonable time to visit San José del Castillo for sightseeing.

What to pack for San José del Castillo in September

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

In September, San José del Castillo sees daytime highs around 26°C and nights near 17°C. Pack rain gear. Worth having: light clothes and sun protection. About 19 days see rain.

rain gearlight clothessun protection

UV index in San José del Castillo 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 José del Castillo peaks around May 13 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 16 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 13UV 14Dec 16UV 7
UV index (midday)Level
Jan8Very high
Feb11Extreme
Mar13Extreme
Apr13Extreme
May14Extreme
Jun13Extreme
Jul12Extreme
Aug13Extreme
Sep12Extreme
Oct10Very high
Nov8Very high
Dec7High

Air quality in San José del Castillo 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 José del Castillo is worst in May — around 44 µg/m³ PM2.5 (poor), about 3.2× the cleanest month (July, 14 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorModerateMay 1342 µg/m³Jul 2114 µg/m³
PM2.5 (µg/m³)Level
Jan20Moderate
Feb18Moderate
Mar20Moderate
Apr33Moderate
May44Poor
Jun17Moderate
Jul14Moderate
Aug15Moderate
Sep17Moderate
Oct17Moderate
Nov18Moderate
Dec21Moderate
Location & terrain

Where is San José del Castillo?

San José del Castillo sits at 20.5°N, 103.2°W, 1,569 m above sea level, in Mexico. The nearest listed city is San José del Quince, 6.0 km away.

Topography around San José del Castillo

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of San José del Castillo.

Within 3 km, the terrain around San José del Castillo has only modest variations in elevation — a maximum elevation change of 222 m around an average of 1,551 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 824 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,364 m.

The land around San José del Castillo is covered by artificial surfaces (36%), cropland (25%) and grassland (23%) within 3 km, cropland (31%) and artificial surfaces (26%) within 16 km, and trees (32%) and cropland (25%) within 80 km.

3 km
222 m
16 km
824 m
80 km
2,364 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: San José del Quince 6.0 km · Las Pintitas 9.0 km · Las Pintas de Arriba 12 km · Tonalá 12 km · Hacienda Santa Fe 15 km · Tlaquepaque 16 km · Coyula 17 km · Lomas del Sur 19 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 José del Castillo (20.5117°, -103.2369°, elevation 1,569 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).