Loreto weather in September

In September, Loreto sees average daytime highs of 25°C and overnight lows near 14°C, with 81 mm of rain across 11 wet days and about 12.1 hours of daylight. It is the 7th-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 25°C through the month. The sky is clear or mostly clear about 27% of the time in September, and the air most often feels dry.

Daylight stretches from about 12 h 30 min at the start of September to 11 h 48 min by month's end. Set against the rest of the year, September is Loreto's 12th-clearest and 7th-windiest month. For the whole year in context, see Loreto's year-round climate.

Daytime high
25°
7th warmest
Overnight low
14°
9th coldest
Rainfall
81 mm
11 wet days
Daylight
12 h 06 min
6:38 AM – 6:46 PM
Cloud cover
61%
12th clearest
Wind
10 km/h
7th windiest
Solar energy
5.62 kWh/m²
Travel score
6.6
out of 10

Loreto is human settlement in Zacatecas, 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 25°C through the month.

A typical September day in Loreto reaches about 25°C in the afternoon and slips back to 14°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 22°C and 28°C. Set against its neighbours, September runs about 1°C cooler than August and on par with October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12515
22515
32515
42515
52515
62515
72514
82514
92514
102514
112514
122514
132514
142514
152514
162514
172514
182514
192514
202514
212514
222514
232514
242514
252514
262514
272513
282513
292513
302513

Loreto weather by month

How September compares with the rest of the year at a glance. September is the 7th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan21° / 142.110.87.9
Feb23° / 111.711.28.6
Mar25° / 61.311.88.6
Apr28° / 12°51.612.57.6
May29° / 14°224.913.16.4
Jun28° / 15°701013.36.1
Jul26° / 15°9512.113.26.4
Aug26° / 15°8011.112.86.5
Sep25° / 14°811112.16.6
Oct25° / 12°305.111.57.9
Nov23° / 101.810.98.6
Dec21° / 71.110.78.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 27% of the time in September, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 21% of September, with mostly cloudy or overcast conditions the remaining 52%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14753
24654
34555
44555
54456
64456
74456
84456
94456
104654
114654
124654
134753
144654
154654
164753
174852
184852
194852
204951
215050
225050
235050
245149
255248
265248
275446
285545
295545
305644

Chance of precipitation in September

Any precipitation

Loreto gets around 81 mm of rain over 11 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 36% and peaks near 42% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
142
242
342
442
542
642
741
841
941
1041
1141
1240
1340
1439
1539
1638
1737
1836
1935
2034
2133
2232
2331
2430
2529
2628
2727
2826
2925
3025

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the dry band about 66% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
163361
263361
362371
462371
562371
662371
761381
861381
962371
1062371
1162371
1262371
1363361
1463361
1564351
1664351
1765341
1865341
1966331
2067321
2168311
2269301
2370291
2472271
2573261
2675241
2776231
2877221
2979201
3081190

Wind in September

Winds average 10 km/h in September.

Across September, daily wind ranges from about 10 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 30 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 42 minutes over September. Sunrise moves from 6:34 AM to 6:43 AM, and sunset from 7:01 PM to 6:32 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.56:347:01
212.46:347:00
312.46:356:59
412.46:356:58
512.46:356:57
612.36:366:56
712.36:366:55
812.36:366:54
912.36:366:53
1012.36:376:52
1112.26:376:51
1212.26:376:50
1312.26:386:49
1412.26:386:48
1512.16:386:47
1612.16:386:46
1712.16:396:45
1812.16:396:44
1912.16:396:43
2012.06:406:42
2112.06:406:41
2212.06:406:40
2312.06:416:39
2412.06:416:38
2511.96:416:37
2611.96:416:36
2711.96:426:35
2811.96:426:34
2911.86:426:33
3011.86:436:32

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.62 kWh/m².

For context, solar energy here swings from a low near 4.68 kWh/m² to a high of 7.7 kWh/m² in May across the year — September's 5.62 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.9Bright
25.9Bright
35.9Bright
45.8Bright
55.8Bright
65.8Bright
75.8Bright
85.8Bright
95.7Bright
105.7Bright
115.7Bright
125.7Bright
135.7Bright
145.7Bright
155.7Bright
165.7Bright
175.7Bright
185.6Bright
195.6Bright
205.6Bright
215.6Bright
225.6Bright
235.6Bright
245.6Bright
255.6Bright
265.6Bright
275.5Bright
285.5Bright
295.5Bright
305.5Bright
Planning a trip in September

Is September a good time to visit Loreto?

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

6.6
Sightseeing
8th-best month of the year
6.0
Beach & pool
10th-best month of the year

September is a reasonable time to visit Loreto for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Loreto in September

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

In September, Loreto sees daytime highs around 25°C and nights near 14°C. Worth packing: light clothes, rain gear and sun protection. About 11 days see rain.

light clothesrain gearsun protection

UV index in Loreto in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Loreto peaks around May 24 at about 14 (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 highMay 24UV 14Dec 18UV 7
UV index (midday)Level
Jan7Very high
Feb10Extreme
Mar12Extreme
Apr14Extreme
May14Extreme
Jun14Extreme
Jul13Extreme
Aug14Extreme
Sep13Extreme
Oct10Extreme
Nov8Very high
Dec7High
Location & terrain

Where is Loreto?

Loreto sits at 22.3°N, 102.0°W, 2,065 m above sea level, in Mexico. The nearest listed city is Pabellón de Arteaga, 33 km away.

Topography around Loreto

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

Within 3 km, the terrain around Loreto has only modest variations in elevation — a maximum elevation change of 82 m around an average of 2,034 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 671 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,290 m.

The land around Loreto is covered by cropland (56%) within 3 km, shrubs (56%) and cropland (33%) within 16 km, and shrubs (55%) and cropland (30%) within 80 km.

3 km
82 m
16 km
671 m
80 km
1,290 m
treesshrubsgrasslandcroplandartificial surfacesbare terrain
September weather nearby: Pabellón de Arteaga 33 km · Rincón de Romos 35 km · San Francisco de los Romo 37 km · Salinas de Hidalgo 48 km · Jesús María 50 km · Aguascalientes 53 km · Guadalupe 76 km · Zacatecas 82 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 Loreto (22.2719°, -101.986°, elevation 2,065 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).