Loma Bonita weather in September

In September, Loma Bonita sees average daytime highs of 31°C and overnight lows near 24°C, with 403 mm of rain across 26.5 wet days and about 12.1 hours of daylight. It is the 6th-warmest and 1st-wettest month of the year here.

Day-to-day highs hold fairly steady near 31°C through the month. The sky is clear or mostly clear about 11% 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 54 min by month's end. Set against the rest of the year, September is Loma Bonita's 12th-clearest and 12th-windiest month. For the whole year in context, see Loma Bonita's year-round climate.

Daytime high
31°
6th warmest
Overnight low
24°
8th coldest
Rainfall
403 mm
26.5 wet days
Daylight
12 h 06 min
6:15 AM – 6:21 PM
Cloud cover
78%
12th clearest
Wind
5 km/h
12th windiest
Solar energy
4.71 kWh/m²
Travel score
2.6
out of 10

Loma Bonita is municipal seat of Loma Bonita, State of Oaxaca, 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 31°C through the month.

A typical September day in Loma Bonita reaches about 31°C in the afternoon and slips back to 24°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 34°C. Set against its neighbours, September runs on par with August and about 1°C warmer than October.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
13224
23224
33224
43224
53224
63224
73224
83224
93224
103224
113224
123224
133224
143224
153224
163224
173224
183124
193124
203124
213124
223124
233124
243124
253124
263124
273124
283124
293124
303124

How September really feels in Loma Bonita

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.

Loma Bonita weather by month

How September compares with the rest of the year at a glance. September is the 6th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan26° / 18°507.9117.1
Feb28° / 19°356.311.46.7
Mar31° / 21°325.711.95.2
Apr34° / 23°426.312.43.5
May34° / 25°11013.212.82.7
Jun33° / 25°32124.113.12.3
Jul32° / 24°34126.6132.5
Aug32° / 24°36027.112.62.4
Sep31° / 24°40326.512.12.6
Oct30° / 23°24819.111.63.8
Nov28° / 21°11312.311.15.7
Dec27° / 19°548.810.96.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 11% of the time in September, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 14% of September, with mostly cloudy or overcast conditions the remaining 76%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
12674
22674
32575
42575
52575
62575
72575
82575
92575
102575
112476
122476
132476
142476
152476
162476
172476
182476
192476
202377
212377
222377
232476
242476
252476
262476
272575
282575
292575
302575

Chance of precipitation in September

Any precipitation

Loma Bonita gets around 403 mm of rain over 26.5 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 87% and peaks near 92% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%100%151015202530
Rain chance (%)
192
292
392
492
592
692
792
892
992
1091
1191
1290
1390
1489
1588
1687
1787
1886
1986
2085
2185
2284
2383
2482
2581
2681
2780
2879
2978
3077

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 61% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1006040
2006040
3015940
4015940
5015940
6015940
7015940
8015940
9015940
10015940
11015940
12015940
13015940
14015940
15016039
16016039
17016039
18016138
19016237
20026236
21026335
22036334
23046333
24156232
25166231
26176329
27186328
28196327
291106326
301106425

Wind in September

Winds average 5 km/h in September, the calmest month.

Across September, daily wind ranges from about 5 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
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
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 54 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 30 minutes over September. Sunrise moves from 6:12 AM to 6:17 AM, and sunset from 6:34 PM to 6:08 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.46:126:34
212.36:136:33
312.36:136:32
412.36:136:31
512.36:136:31
612.36:136:30
712.36:136:29
812.26:146:28
912.26:146:27
1012.26:146:26
1112.26:146:25
1212.26:146:24
1312.26:146:24
1412.16:156:23
1512.16:156:22
1612.16:156:21
1712.16:156:20
1812.16:156:19
1912.06:156:18
2012.06:156:17
2112.06:166:16
2212.06:166:15
2312.06:166:15
2412.06:166:14
2511.96:166:13
2611.96:166:12
2711.96:176:11
2811.96:176:10
2911.96:176:09
3011.96:176:08

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.71 kWh/m².

For context, solar energy here swings from a low near 3.44 kWh/m² to a high of 6.31 kWh/m² in May across the year — September's 4.71 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.2Bright
25.1Bright
35.1Bright
45.1Bright
55.0Bright
65.0Bright
75.0Bright
84.9Bright
94.9Bright
104.9Bright
114.9Bright
124.8Bright
134.8Bright
144.8Bright
154.8Bright
164.7Bright
174.7Bright
184.7Bright
194.7Bright
204.6Bright
214.6Bright
224.6Bright
234.5Bright
244.5Bright
254.5Bright
264.5Bright
274.4Bright
284.4Bright
294.4Bright
304.4Bright
Planning a trip in September

Hazard calendar for Loma Bonita

In seasonPeak

In September, Loma Bonita sits inside its monsoon season. The full year is below, with each hazard's peak months called out.

Loma Bonita's monsoon runs June–October, when most of the year's rain falls.

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

Is September a good time to visit Loma Bonita?

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

2.6
Sightseeing
9th-best month of the year
4.0
Beach & pool
11th-best month of the year

September is a weaker month for outdoor sightseeing in Loma Bonita.

What to pack for Loma Bonita in September

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

In September, Loma Bonita sees daytime highs around 31°C and nights near 24°C. Pack light clothes and rain gear. Worth having: sun protection. About 27 days see rain.

light clothesrain gearsun protection

UV index in Loma Bonita in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Loma Bonita peaks around August 17 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 18 at about 7 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highExtremeVery highAug 17UV 12Dec 18UV 7
UV index (midday)Level
Jan8Very high
Feb10Extreme
Mar10Extreme
Apr12Extreme
May8Very high
Jun12Extreme
Jul11Extreme
Aug13Extreme
Sep11Extreme
Oct10Very high
Nov8Very high
Dec7High

Air quality in Loma Bonita 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 Loma Bonita is worst in May — around 49 µg/m³ PM2.5 (poor), about 3.7× the cleanest month (January, 13 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorModerateMay 1647 µg/m³Jan 1513 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb15Moderate
Mar20Moderate
Apr31Moderate
May49Poor
Jun28Moderate
Jul31Moderate
Aug24Moderate
Sep21Moderate
Oct15Moderate
Nov14Moderate
Dec15Moderate
Location & terrain

Where is Loma Bonita?

Loma Bonita sits at 18.1°N, 95.9°W, 25 m above sea level, in Mexico. The nearest listed city is Tuxtepec, 26 km away.

Topography around Loma Bonita

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

Within 3 km, the terrain around Loma Bonita has only modest variations in elevation — a maximum elevation change of 41 m around an average of 22 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 119 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,715 m.

The land around Loma Bonita is covered by grassland (52%) and trees (27%) within 3 km, grassland (44%) and trees (34%) within 16 km, and trees (40%) and grassland (36%) within 80 km.

3 km
41 m
16 km
119 m
80 km
2,715 m
treesgrasslandcroplandartificial surfaceswaterwetlandmangroves
September weather nearby: Tuxtepec 26 km · Cosamaloapan 30 km · Tres Valles 31 km · Carlos A. Carrillo 33 km · Isla 38 km · Tlacotalpan 61 km · La Isla 62 km · Tierra Blanca 63 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 Loma Bonita (18.1077°, -95.8805°, elevation 25 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).