Ometepec weather in September

In September, Ometepec sees average daytime highs of 30°C and overnight lows near 22°C, with 366 mm of rain across 28.8 wet days and about 12.1 hours of daylight. It is the 12th-warmest and 1st-wettest month of the year here.

Day-to-day highs hold fairly steady near 30°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 18 min at the start of September to 11 h 54 min by month's end. Set against the rest of the year, September is Ometepec's 12th-clearest and 12th-windiest month. For the whole year in context, see Ometepec's year-round climate.

Daytime high
30°
12th warmest
Overnight low
22°
8th coldest
Rainfall
366 mm
28.8 wet days
Daylight
12 h 06 min
6:25 AM – 6:31 PM
Cloud cover
84%
12th clearest
Wind
4 km/h
12th windiest
Solar energy
4.78 kWh/m²
Travel score
2.7
out of 10

Ometepec is municipal seat of Ometepec, State of Guerrero, 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 30°C through the month.

A typical September day in Ometepec reaches about 30°C in the afternoon and slips back to 22°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 32°C. Set against its neighbours, September runs about 1°C cooler than August and on par with October.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
13022
23022
33022
43022
53022
63022
73022
83022
93022
103022
113022
123022
133022
143022
153022
163022
173022
183022
193022
203022
213022
223022
233022
243022
253022
263022
273022
283022
293022
303022

How September really feels in Ometepec

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.

Ometepec weather by month

How September compares with the rest of the year at a glance. September is the 12th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan32° / 18°71.811.14.9
Feb33° / 19°40.811.44.4
Mar34° / 20°60.911.93.8
Apr35° / 21°61.212.43.1
May34° / 23°8912.312.82.7
Jun31° / 23°31725.6132.6
Jul31° / 22°27727.712.92.7
Aug31° / 22°34128.912.62.7
Sep30° / 22°36628.812.12.7
Oct30° / 21°23824.911.63.3
Nov31° / 20°619.511.24.7
Dec32° / 19°122.3115.1

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 10% of September, with mostly cloudy or overcast conditions the remaining 87%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
11585
21585
31585
41585
51387
61387
71387
81387
91387
101387
111189
121288
131288
141288
151288
161288
171288
181288
191189
201189
211288
221288
231288
241288
251387
261486
271585
281684
291783
301882

Chance of precipitation in September

Any precipitation

Ometepec gets around 366 mm of rain over 28.8 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 95% and peaks near 96% on the wettest days.

0%20%40%60%80%100%151015202530
Rain chance (%)
196
296
396
496
595
695
795
895
995
1095
1195
1295
1395
1496
1596
1696
1796
1896
1996
2096
2196
2296
2396
2496
2596
2695
2795
2894
2994
3093

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 99% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)Miserable (%)
11990
21990
301000
401000
501000
601000
701000
81990
91990
101990
111990
121990
131990
141990
151990
161990
171990
181990
191990
201990
211990
221990
231981
241981
251981
261981
272971
282971
292971
302971

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 18 min at the start of September to 11 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 24 minutes over September. Sunrise moves from 6:23 AM to 6:27 AM, and sunset from 6:43 PM to 6:19 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.36:236:43
212.36:246:42
312.36:246:42
412.36:246:41
512.36:246:40
612.36:246:39
712.26:246:38
812.26:246:38
912.26:246:37
1012.26:256:36
1112.26:256:35
1212.26:256:34
1312.16:256:33
1412.16:256:32
1512.16:256:32
1612.16:256:31
1712.16:256:30
1812.16:256:29
1912.06:266:28
2012.06:266:27
2112.06:266:26
2212.06:266:26
2312.06:266:25
2412.06:266:24
2511.96:266:23
2611.96:266:22
2711.96:266:21
2811.96:276:21
2911.96:276:20
3011.96:276:19

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.78 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 4.78 kWh/m² to a high of 7.1 kWh/m² in April across the year — September's 4.78 kWh/m² sits near the bottom.

0246151015202530
Solar energy (kWh/m²)Level
15.1Bright
25.0Bright
35.0Bright
45.0Bright
55.0Bright
65.0Bright
75.0Bright
85.0Bright
94.9Bright
104.9Bright
114.9Bright
124.9Bright
134.8Bright
144.8Bright
154.8Bright
164.8Bright
174.8Bright
184.8Bright
194.7Bright
204.7Bright
214.7Bright
224.7Bright
234.7Bright
244.7Bright
254.7Bright
264.7Bright
274.7Bright
284.7Bright
294.7Bright
304.7Bright
Planning a trip in September

Hazard calendar for Ometepec

In seasonPeak

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

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

Ometepec's monsoon runs June–October, 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 Ometepec?

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

2.7
Sightseeing
8th-best month of the year
3.7
Beach & pool
12th-best month of the year

September is a weaker month for outdoor sightseeing in Ometepec.

What to pack for Ometepec in September

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

In September, Ometepec sees daytime highs around 30°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 Ometepec 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 42 km away) is warmest in August at about 31°C and coldest in March near 28°C.

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

26°28°30°32°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan29Tropical
Feb28Tropical
Mar28Tropical
Apr28Tropical
May29Tropical
Jun30Tropical
Jul30Tropical
Aug31Tropical
Sep30Tropical
Oct30Tropical
Nov30Tropical
Dec29Tropical

UV index in Ometepec 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 Ometepec peaks around April 9 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 13 at about 8 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeExtremeVery highApr 9UV 13Dec 13UV 8
UV index (midday)Level
Jan9Very high
Feb12Extreme
Mar13Extreme
Apr13Extreme
May9Very high
Jun11Extreme
Jul12Extreme
Aug12Extreme
Sep12Extreme
Oct11Extreme
Nov8Very high
Dec8Very high

Air quality in Ometepec 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 Ometepec is worst in May — around 48 µg/m³ PM2.5 (poor), about 6.0× the cleanest month (January, 8 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecGoodModeratePoorModerateGoodMay 1446 µg/m³Jan 148 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb9Good
Mar19Moderate
Apr35Moderate
May48Poor
Jun17Moderate
Jul18Moderate
Aug16Moderate
Sep14Moderate
Oct11Good
Nov9Good
Dec9Good
Location & terrain

Where is Ometepec?

Ometepec sits at 16.7°N, 98.4°W, 334 m above sea level, in Mexico. The nearest listed city is Pinotepa Nacional, 54 km away.

Topography around Ometepec

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

Within 3 km, the terrain around Ometepec has significant variations in elevation — a maximum elevation change of 367 m around an average of 329 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,029 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,970 m.

The land around Ometepec is covered by grassland (52%) and trees (29%) within 3 km, trees (51%) and grassland (38%) within 16 km, and trees (60%) and water (20%) within 80 km.

3 km
367 m
16 km
1,029 m
80 km
2,970 m
treesshrubsgrasslandcroplandartificial surfaceswater
September weather nearby: Pinotepa Nacional 54 km · Ayutla de los Libres 79 km · Tlapa de Comonfort 97 km · Heroica Ciudad de Tlaxiaco 101 km · Chilapa de Álvarez 130 km · Ciudad de Huajuapan de León 141 km · Tixtla de Guerrero 143 km · Chilpancingo 151 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 Ometepec (16.6901°, -98.408°, elevation 334 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).