San José del Valle weather in September

In September, San José del Valle sees average daytime highs of 29°C and overnight lows near 24°C, with 336 mm of rain across 27.7 wet days and about 12.1 hours of daylight. It is the 4th-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 29°C through the month. The sky is clear or mostly clear about 5% of the time in September, and the air most often feels oppressive.

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 Valle's 12th-clearest and 11th-windiest month. For the whole year in context, see San José del Valle's year-round climate.

Daytime high
29°
4th warmest
Overnight low
24°
10th coldest
Rainfall
336 mm
27.7 wet days
Daylight
12 h 06 min
5:52 AM – 5:59 PM
Cloud cover
82%
12th clearest
Wind
4 km/h
11th windiest
Solar energy
4.4 kWh/m²
Travel score
3.1
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 29°C through the month.

A typical September day in San José del Valle reaches about 29°C in the afternoon and slips back to 24°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 30°C. Set against its neighbours, September runs on par with August and on par with October.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12924
22924
32924
42924
52924
62924
72924
82924
92924
102924
112924
122924
132924
142924
152924
162924
172924
182924
192924
202924
212924
222924
232924
242924
252924
262924
272924
282924
292924
302924

How September really feels in San José del Valle

Once humidity and wind are folded in, September averages 30 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
30
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 José del Valle weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan25° / 18°272.710.98.3
Feb25° / 18°20211.38.5
Mar26° / 18°9111.98.6
Apr27° / 19°20.412.58.4
May28° / 22°71.4137.4
Jun29° / 24°17015.513.24.8
Jul29° / 24°25125.613.13.3
Aug29° / 24°33828.212.73.1
Sep29° / 24°33627.712.13.1
Oct29° / 23°14416.911.54.8
Nov28° / 21°304.7117.4
Dec26° / 19°222.510.88.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 5% of the time in September, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 11% of September, with mostly cloudy or overcast conditions the remaining 84%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
11189
21189
31189
41090
51189
61189
71288
81288
91288
101387
111387
121387
131486
141486
151486
161486
171486
181585
191585
201585
211585
221783
231882
241981
252080
262278
272476
282575
292773
302971

Chance of precipitation in September

Any precipitation

San José del Valle gets around 336 mm of rain over 27.7 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 91% and peaks near 93% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%100%151015202530
Rain chance (%)
193
293
393
493
593
693
793
893
993
1092
1192
1292
1392
1492
1592
1692
1792
1892
1992
2092
2192
2291
2391
2490
2589
2688
2787
2886
2985
3083

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the oppressive band about 67% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Oppressive (%)Miserable (%)
17030
27129
37129
47228
57228
67228
77228
87228
97228
107129
117129
127129
137030
146931
156832
166733
176733
186634
196535
206535
216436
226436
236337
246337
256238
266238
276238
286238
296238
306238

Wind in September

Winds average 4 km/h in September.

Across September, daily wind ranges from about 4 km/h on the calmest days to 5 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
275calm
285calm
295calm
305calm

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 5:48 AM to 5:55 AM, and sunset from 6:13 PM to 5:45 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.45:486:13
212.45:486:12
312.45:496:11
412.45:496:10
512.35:496:09
612.35:496:08
712.35:506:08
812.35:506:07
912.35:506:06
1012.25:506:05
1112.25:516:04
1212.25:516:03
1312.25:516:02
1412.25:516:01
1512.15:516:00
1612.15:525:59
1712.15:525:58
1812.15:525:57
1912.15:525:56
2012.05:535:55
2112.05:535:54
2212.05:535:53
2312.05:535:52
2412.05:545:51
2511.95:545:50
2611.95:545:49
2711.95:545:48
2811.95:555:47
2911.95:555:46
3011.85:555:45

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.4 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 4.4 kWh/m² to a high of 7.33 kWh/m² in May across the year — September's 4.4 kWh/m² sits near the bottom.

024151015202530
Solar energy (kWh/m²)Level
14.5Bright
24.5Bright
34.5Bright
44.5Bright
54.5Bright
64.5Bright
74.5Bright
84.5Bright
94.5Bright
104.5Bright
114.5Bright
124.5Bright
134.5Bright
144.4Bright
154.4Bright
164.4Bright
174.4Bright
184.4Bright
194.4Bright
204.4Bright
214.4Bright
224.4Bright
234.4Bright
244.4Bright
254.4Bright
264.4Bright
274.4Bright
284.5Bright
294.5Bright
304.5Bright
Planning a trip in September

Hazard calendar for San José del Valle

In seasonPeak

In September, San José del Valle sits inside its pacific hurricane and monsoon season. The full year is below, with each hazard's peak months called out.

San José del Valle sits in the eastern Pacific hurricane zone; the season peaks August–September.

San José del Valle's monsoon runs June–September, when most of the year's rain falls.

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

Is September a good time to visit San José del Valle?

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

3.1
Sightseeing
11th-best month of the year
4.0
Beach & pool
11th-best month of the year

September is a weaker month for outdoor sightseeing in San José del Valle.

What to pack for San José del Valle in September

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

In September, San José del Valle sees daytime highs around 29°C and nights near 24°C. Pack light clothes and rain gear. About 28 days see rain.

light clothesrain gear

Sea temperature near San José del Valle in September

The nearest coast averages about 30°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 20 km away) is warmest in August at about 30°C and coldest in March near 24°C.

The water stays above 20°C all year — warm enough for a swim any month.

22°24°26°28°30°32°JanFebMarAprMayJunJulAugSepOctNovDecrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan25Warm
Feb25Warm
Mar24Warm
Apr25Warm
May27Warm
Jun28Tropical
Jul30Tropical
Aug30Tropical
Sep30Tropical
Oct30Tropical
Nov28Tropical
Dec26Warm

UV index in San José del Valle 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 Valle peaks around May 11 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 16 at about 6 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highHighMay 11UV 13Dec 16UV 6
UV index (midday)Level
Jan7High
Feb10Very high
Mar11Extreme
Apr12Extreme
May13Extreme
Jun11Extreme
Jul12Extreme
Aug11Extreme
Sep12Extreme
Oct10Very high
Nov7High
Dec6High

Air quality in San José del Valle 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 Valle is worst in May — around 24 µg/m³ PM2.5 (moderate), about 3.2× the cleanest month (February, 8 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodMay 1823 µg/m³Feb 158 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb8Good
Mar8Good
Apr11Good
May24Moderate
Jun15Moderate
Jul10Good
Aug10Good
Sep9Good
Oct9Good
Nov8Good
Dec8Good
Location & terrain

Where is San José del Valle?

San José del Valle sits at 20.8°N, 105.2°W, 24 m above sea level, in Mexico. The nearest listed city is Ixtapa, 6.0 km away.

Topography around San José del Valle

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

Within 3 km, the terrain around San José del Valle has only modest variations in elevation — a maximum elevation change of 55 m around an average of 22 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,205 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,708 m.

The land around San José del Valle is covered by cropland (53%) and trees (20%) within 3 km, trees (55%) within 16 km, and trees (58%) and water (31%) within 80 km.

3 km
55 m
16 km
1,205 m
80 km
2,708 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Ixtapa 6.0 km · Mezcales 7.0 km · Bucerías 11 km · Puerto Vallarta 16 km · Sayulita 25 km · Compostela 63 km · Xalisco 83 km · El Salto 90 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 Valle (20.7638°, -105.2281°, elevation 24 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).