Compostela weather in September

In September, Compostela sees average daytime highs of 28°C and overnight lows near 22°C, with 361 mm of rain across 29.1 wet days and about 12.1 hours of daylight. It is the 6th-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 28°C through the month. The sky is clear or mostly clear about 3% 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 Compostela's 12th-clearest and 12th-windiest month. For the whole year in context, see Compostela's year-round climate.

Daytime high
28°
6th warmest
Overnight low
22°
11th coldest
Rainfall
361 mm
29.1 wet days
Daylight
12 h 06 min
5:50 AM – 5:58 PM
Cloud cover
84%
12th clearest
Wind
4 km/h
12th windiest
Solar energy
4.53 kWh/m²
Travel score
3.1
out of 10

Compostela is municipal seat of Compostela, State of Nayarit, Mexico.

Founded
1540

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 28°C through the month.

A typical September day in Compostela reaches about 28°C in the afternoon and slips back to 22°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 26°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)
12822
22822
32822
42822
52822
62822
72822
82822
92822
102822
112822
122822
132822
142822
152822
162822
172822
182822
192822
202822
212822
222822
232822
242822
252822
262822
272822
282822
292822
302922

Compostela weather by month

How September compares with the rest of the year at a glance. September is the 6th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan25° / 14°222.410.98.3
Feb26° / 15°191.811.38.4
Mar27° / 15°81.311.88.4
Apr28° / 16°30.812.57.7
May29° / 18°153.6136.5
Jun29° / 21°19818.813.34.4
Jul28° / 22°34429.613.23.1
Aug28° / 22°41730.412.73.0
Sep28° / 22°36129.112.13.1
Oct28° / 21°13318.811.54.7
Nov27° / 18°224.5117.6
Dec26° / 15°212.110.78.3

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 3% 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 86%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1991
2991
3991
41090
51090
61090
71090
81189
91288
101288
111288
121288
131288
141288
151288
161288
171288
181288
191288
201288
211387
221486
231585
241684
251783
261981
272080
282377
292575
302674

Chance of precipitation in September

Any precipitation

Compostela gets around 361 mm of rain over 29.1 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 96% and peaks near 99% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%100%151015202530
Rain chance (%)
199
299
399
499
599
699
799
899
998
1098
1198
1298
1398
1498
1597
1697
1797
1897
1997
2096
2196
2296
2395
2494
2594
2693
2792
2891
2990
3089

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 91% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)Miserable (%)
15941
26931
36940
46940
56940
67930
77930
88920
98920
108920
119910
129910
139910
149910
159910
169910
179910
189910
1910900
2010900
2110900
2210900
2310900
2411890
2511890
2612880
2712880
2813870
2914860
3014860

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 5:46 AM to 5:54 AM, and sunset from 6:12 PM to 5:44 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.45:466:12
212.45:476:11
312.45:476:10
412.45:476:09
512.35:486:08
612.35:486:07
712.35:486:06
812.35:486:05
912.35:496:04
1012.25:496:03
1112.25:496:03
1212.25:496:02
1312.25:506:01
1412.25:506:00
1512.15:505:59
1612.15:505:58
1712.15:515:57
1812.15:515:56
1912.15:515:55
2012.05:515:54
2112.05:525:53
2212.05:525:52
2312.05:525:51
2412.05:525:50
2511.95:535:49
2611.95:535:48
2711.95:535:47
2811.95:535:46
2911.85:545:45
3011.85:545:44

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.53 kWh/m².

For context, solar energy here swings from a low near 4.48 kWh/m² to a high of 7.47 kWh/m² in May across the year — September's 4.53 kWh/m² sits near the bottom.

024151015202530
Solar energy (kWh/m²)Level
14.6Bright
24.6Bright
34.6Bright
44.6Bright
54.6Bright
64.6Bright
74.6Bright
84.6Bright
94.6Bright
104.6Bright
114.6Bright
124.6Bright
134.6Bright
144.6Bright
154.6Bright
164.5Bright
174.5Bright
184.5Bright
194.5Bright
204.5Bright
214.5Bright
224.5Bright
234.5Bright
244.5Bright
254.6Bright
264.6Bright
274.6Bright
284.6Bright
294.6Bright
304.6Bright
Planning a trip in September

Hazard calendar for Compostela

In seasonPeak

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

Compostela sits in the eastern Pacific hurricane zone; the season peaks August–September.

Compostela'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 Compostela?

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

3.1
Sightseeing
10th-best month of the year
3.7
Beach & pool
11th-best month of the year

September is a weaker month for outdoor sightseeing in Compostela.

What to pack for Compostela in September

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

In September, Compostela sees daytime highs around 28°C and nights near 22°C. Pack light clothes and rain gear. Worth having: sun protection. About 29 days see rain.

light clothesrain gearsun protection

Sea temperature near Compostela 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 51 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 Compostela 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 Compostela peaks around May 11 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 17 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 17UV 6
UV index (midday)Level
Jan7High
Feb10Very high
Mar12Extreme
Apr13Extreme
May13Extreme
Jun11Extreme
Jul12Extreme
Aug12Extreme
Sep12Extreme
Oct10Very high
Nov7High
Dec6High

Air quality in Compostela 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 Compostela 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 Compostela?

Compostela sits at 21.2°N, 104.9°W, 855 m above sea level, in Mexico. The nearest listed city is Xalisco, 23 km away.

Topography around Compostela

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Compostela.

Within 3 km, the terrain around Compostela has only modest variations in elevation — a maximum elevation change of 115 m around an average of 865 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,712 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,631 m.

The land around Compostela is covered by grassland (40%) and cropland (29%) within 3 km, trees (68%) within 16 km, and trees (63%) within 80 km.

3 km
115 m
16 km
1,712 m
80 km
2,631 m
treesshrubsgrasslandcroplandartificial surfaceswatermangroves
September weather nearby: Xalisco 23 km · Tepic 30 km · Ixtlán del Río 60 km · San José del Valle 63 km · Ixtapa 66 km · Mezcales 69 km · Sayulita 69 km · Bucerías 70 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 Compostela (21.2373°, -104.9006°, elevation 855 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).