Climate and average weather in Loreto

In Loreto, the summers are hot, fairly dry, and mostly clear and the winters are mild and mostly clear.

Best: early January to late April

Over the course of the year, the temperature in Loreto typically varies from 6°C to 29°C, and is rarely below 2°C or above 32°C. May is the hottest month of the year, while January is the coldest.

Based on the travel score, the best times of year to visit Loreto for warm-weather activities are from early January to late April and late September to late December.

Hottest
May
29°
Coldest
Jan
Wettest
Jul
95 mm
Driest
Apr
5 mm
Rain / yr
430 mm
64 wet days
Daylight
10.6–13.4 h
shortest–longest
Elevation
2,065 m
22.3°N
Clearest
Nov
34% cloud

Loreto is human settlement in Zacatecas, Mexico.

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Loreto weather by month, at a glance

The whole year in one picture — sky, rain, humidity, temperature and travel score. Click any band to jump to its full chart.

Each stripe is one measure across the whole year, stacked so a single day reads top to bottom. The sky band runs overcast grey on top down to clear blue at the base — more blue means sunnier — followed by the rainfall curve, the humidity band, a temperature strip that tints each stretch of the year by how warm its average high is, and the travel-score line at the foot. Scan straight down any date to read that day across every measure at once; the score climbs highest around early January to late April.

Temperature through the year

Average highAverage lowShaded bands: 10–90% of days

Daily average highs and lows in Loreto, from 1991–2020 of climate data. The shaded bands show the range most days fall in — 10th to 90th percentile.

The hot season lasts 2.6 months, from April 6 to June 23, with daily high temperatures above 27°C. The hottest month of the year in Loreto is May, with an average high of 29°C and low of 14°C.

The cool season lasts 2.3 months, from December 3 to February 9, with daily high temperatures below 22°C. The coldest month of the year in Loreto is January, with an average low of 6°C and high of 21°C.

Days typically run about 14°C warmer than nights, with the widest day–night swing (around 16°C) in April.

10°20°30°JanFebMarAprMayJunJulAugSepOctNovDec
Avg high (°C)Avg low (°C)
Jan216
Feb237
Mar259
Apr2812
May2914
Jun2815
Jul2615
Aug2615
Sep2514
Oct2512
Nov239
Dec216

Average hourly temperature in Loreto

A compact picture of the whole year, hour by hour: each column is a day, each row an hour, and the color is the modeled average temperature. Darker overlays mark night, lighter ones the civil-twilight hours around sunrise and sunset.

Read left to right for the day of the year and top to bottom for the hour of the day; the color is the modeled temperature, cool blues through to hot reds on the same scale as the other charts. A vertical slice is a single day's swing — coolest just before dawn, warmest in the mid-afternoon — while a horizontal slice follows one hour across the seasons. The darker overlay marks night and the lighter one the twilight around sunrise and sunset. Colors run warmest on May afternoons, near 29°C, and coldest before dawn in January, near C.

JanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AM

Loreto weather by month

Every month at a glance. Click a month for its detailed page.

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

Chance of rain

How likely it is to rain on a typical day, and how that shifts across the wetter and drier seasons.

Loreto gets about 430 mm of precipitation a year. On a typical day the chance of rain is some rain, but that rises and falls sharply with the seasons.

The wetter season lasts 4.7 months, from around May 26 to Oct 15, peaking in July at about 45% chance on a given day. The drier stretch runs the rest of the year, bottoming out around Feb 25.

July is the wettest month by volume, with 95 mm over about 12 wet days; April is the driest, with 5 mm.

0%10%20%30%40%50%60%JanFebMarAprMayJunJulAugSepOctNovDecdrierwetterdriermostly drysome rainoften wetvery wetJul 1 · 45%Feb 25 · 3%
Rain on a day (%)Rain days
Jan72
Feb62
Mar41
Apr62
May155
Jun3410
Jul3812
Aug3711
Sep3611
Oct175
Nov62
Dec41

Monthly rainfall

Over a full year, Loreto collects about 430 mm of rain across 64 wet days — roughly 36 mm in an average month.

It doesn’t fall evenly. July is the wettest month with 95 mm, while April is the driest at just 5 mm. The three wettest months alone bring about 60% of the year’s total.

0255075100125JanFebMarAprMayJunJulAugSepOctNovDec141165227095808130107
Rainfall (mm)Rain days
Jan142
Feb112
Mar61
Apr52
May225
Jun7010
Jul9512
Aug8011
Sep8111
Oct305
Nov102
Dec71

Clouds and sunshine

ClearMostly clearPartly cloudyMostly cloudyOvercast

How often the daytime sky is clear, partly cloudy or overcast.

In Loreto, the average share of the sky covered by clouds shows significant seasonal variation over the course of the year.

The clearer part of the year begins around January 11 and lasts for 5.2 months, ending around June 16. The clearest month is May, when the sky is clear, mostly clear, or partly cloudy 78% of the time on average.

The cloudier part of the year begins around June 17 and lasts for 4.0 months, ending around October 17. The cloudiest month is September, when it is overcast or mostly cloudy 51% of the time.

0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JanFebMarAprMayJunJulAugSepOctNovDecMay 23 · 80%Sep 9 · 45%clearmostly clearpartly cloudymostly cloudyovercastclearercloudier
Clearer (%)Cloudier (%)
Jan6733
Feb7327
Mar7525
Apr7030
May7822
Jun6634
Jul5743
Aug5941
Sep4951
Oct6634
Nov7525
Dec6832

Daylight, sunrise and sunset

DaylightNight

Hours of daylight through the year, with sunrise and sunset times.

The gold band is daylight — sunrise runs along its lower edge, sunset along the upper — so it widens toward summer and pinches toward winter, with night the dark area above and below. The longest day, around June 15, brings about 13 h 24 min of light; the shortest, around December 15, only 10 h 36 min — a swing of roughly 2 h 48 min.

12 AM4 AM8 AM12 PM4 PM8 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDec
Daylight (h)Sunrise (AM)Sunset (PM)
Jan10.87:346:20
Feb11.27:256:40
Mar11.87:026:53
Apr12.56:337:04
May13.16:127:16
Jun13.36:087:29
Jul13.26:167:31
Aug12.86:297:15
Sep12.16:386:46
Oct11.56:496:17
Nov10.97:066:01
Dec10.77:256:03

Sunny days

How many genuinely sunny days each month brings — days the sky stays clear or mostly clear — banded into plain-language zones.

Loreto averages about 15 sunny days a month — counting the days the sky stays clear or mostly clear — with a clear seasonal swing between 7 and 20 days.

The sunnier stretch runs 7.7 months, from around Oct 18 to Jun 7. The sunniest month is November, with roughly 19 sunny days (bright).

The greyest month is September, down near 8 sunny days — about 56% fewer than the November peak.

0510152025JanFebMarAprMayJunJulAugSepOctNovDecsunniergreyersunniergloomymixedbrightbrilliantNov 2520 daysSep 87 days
Sunny daysSky
Jan17Bright
Feb17Bright
Mar19Bright
Apr16Bright
May17Bright
Jun13Mixed
Jul11Mixed
Aug11Mixed
Sep8Mixed
Oct15Mixed
Nov19Bright
Dec17Bright

Humidity comfort

DryComfortableHumidMuggyOppressiveMiserable

Share of days at each humidity comfort level, based on the dew point — the measure that tracks how muggy it actually feels.

Humidity comfort is graded by the dew point — the temperature at which the air would be fully saturated — because it tracks how muggy it actually feels far better than relative humidity does. A low dew point feels dry and crisp; a high one feels sticky and oppressive no matter the reading on a humidity gauge.

In Loreto, the air stays dry or comfortable essentially all year. Even in September, the muggiest month, it feels humid or worse only about 1% of the time — humidity is not something you need to plan around here.

0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDeccomfortabledry
Dry (%)Comfortable (%)Humid (%)
Jan10000
Feb10000
Mar10000
Apr10000
May9820
Jun77221
Jul73270
Aug72270
Sep67321
Oct9190
Nov10000
Dec10000

Wind

Average wind speed through the year, banded into plain-language speed zones so a number reads as 'breezy' or 'calm' without knowing the scale.

This is the average sustained wind speed at the standard 10 metres above open ground — the steady flow a weather station reports, not the sharper gusts that come and go, which can run half again as fast. It's the number that says whether a place is generally breezy or calm.

Wind in Loreto is steady company: average speeds sit near 11 km/hcalm — in every month of the year, with no meaningful windy or calm season.

051015JanFebMarAprMayJunJulAugSepOctNovDeccalmlight breezeApr 3 · 12 km/hNov 29 · 10 km/h
Wind speed (km/h)Feels
Jan11calm
Feb11calm
Mar12calm
Apr11calm
May10calm
Jun10calm
Jul10calm
Aug10calm
Sep10calm
Oct10calm
Nov10calm
Dec10calm

Best time to visit Loreto

TravelBeach/poolTemperatureCloudsPrecipitation

To characterize how pleasant the weather is in Loreto throughout the year, we compute two travel scores — one for general sightseeing, one for beach and pool weather.

Around mid April, Loreto is still near the tail of its best-weather window — great conditions with the peak-season crowds already thinning.

Inferred from the travel-score curve; month-by-month visitor numbers are a planned addition.

The travel score favors clear, rainless days with daytime highs between 18°C and 28°C. Based on this score, the best time of year to visit Loreto for general outdoor tourist activities is from late September to late April, with a peak score in the last week of February.

0246810JanFebMarAprMayJunJulAugSepOctNovDecbest timebest timetravel scoretemperaturecloudsprecipitationFeb 25 · 9.0

The travel score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

Travel score (0–10)Rating
Jan7.9ideal
Feb8.6ideal
Mar8.6ideal
Apr7.6ideal
May6.4good
Jun6.1good
Jul6.4good
Aug6.5good
Sep6.7good
Oct7.9ideal
Nov8.6ideal
Dec8.2ideal

The beach/pool score favors clear, rainless days with daytime highs between 24°C and 34°C. Based on this score, the best times of year to visit Loreto for hot-weather activities run from mid February to mid June and again from mid October to mid November, with a peak score in the last week of April.

024681012JanFebMarAprMayJunJulAugSepOctNovDecbest timebest timebeach/pool scoretemperaturecloudsprecipitationApr 27 · 8.5

The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

What to pack for Loreto, by month

EssentialRecommendedOptional

Month by month, what's worth putting in the bag — from the temperature range, rain chance, sun and wind. Tap a month for a quick packing note.

For a warm-season trip around May (highs near 29°C), the essentials are light clothes and sun protection. In the cold season around January (highs near 21°C), pack a warm layer and sun protection.

Light clothing
Warm layer
Winter coat
Rain gear
Sun protection
Windbreaker

In May, Loreto sees daytime highs around 29°C and nights near 14°C. Pack light clothes and sun protection. About 5 days see rain.

UV index (midday) in Loreto by month

LowModerateHighVery highExtreme

Clear-sky midday UV index through the year, shaded by the WHO exposure levels — how much sun protection each month calls for.

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

Average hourly UV index in Loreto

LowModerateHighVery highExtreme

Modeled clear-sky UV for every hour of every day — when in the day sun protection actually matters.

The whole year hour by hour: each column is a day, each row an hour, and the color is the modeled clear-sky UV index — the midday peak scaled down as the sun sits lower in the sky. Darker overlays mark night, lighter ones the civil-twilight hours around sunrise and sunset.

UV falls off far faster than brightness as the sun drops, so even in May the burn window is concentrated in the middle of the day: about 9 hours a day reach index 3 (protection recommended), and 7 hours reach 6 or more. Mornings and late afternoons stay comparatively gentle year round.

JanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AM
UV ≥ 3 (h/day)UV ≥ 6 (h/day)
Jan63
Feb75
Mar86
Apr8.56.5
May97
Jun97
Jul8.56.5
Aug8.56.5
Sep86
Oct75
Nov63.5
Dec62.5
Almanac & agriculture

Growing season

Chance of a frost-free dayFrost-free year round

Loreto is frost-free year round — even the coldest nights rarely reach freezing, so there is no start or end to the growing season.

0%25%50%75%100%JanFebMarAprMayJunJulAugSepOctNovDecfrost-free year round
Frost-free chance (%)Frost nights
Jan990
Feb1000
Mar1000
Apr1000
May1000
Jun1000
Jul1000
Aug1000
Sep1000
Oct1000
Nov1000
Dec990

Growing degree days

Degree days (base 10°C)Frost-free shaded

Growing degree days tally heat above 10°C: each day adds however many degrees its average temperature runs over that threshold, and cold days add nothing. Loreto banks about 2,952 degree days a year, and the running total — which growers use to time plantings and predict maturity — climbs fastest around June.

01,0002,0003,000JanFebMarAprMayJunJulAugSepOctNovDec
Growing degree days (°C·days)
Jan99
Feb142
Mar226
Apr292
May359
Jun348
Jul326
Aug323
Sep286
Oct257
Nov175
Dec117

Solar energy

Average daily shortwave solar energy reaching the ground, banded into brightness zones so the number means something at a glance.

Solar energy is how much sunlight actually reaches the ground each day, measured in kilowatt-hours per square metre (kWh/m²) — the combined effect of how long the sun is up, how high it climbs, and how much cloud gets in the way. It's the raw fuel a solar panel has to work with: for scale, 1 kWh/m² a day is dim and wintry, while 7+ is desert-bright.

Loreto receives about 6.2 kWh/m² a day of solar energy on average — intense — with a clear seasonal swing between 4.6 and 7.7 kWh/m².

The brighter stretch of the year lasts 6.1 months, from around Feb 22 to Aug 25. The brightest month is April, averaging about 7.6 kWh/m² (intense).

The dimmest month is December, down near 4.7 kWh/m² — roughly 38% less than the April peak.

0123456789JanFebMarAprMayJunJulAugSepOctNovDecdimmerbrighterdimmerdimmoderatebrightintenseApr 307.7 kWhDec 194.6 kWh
Solar energy (kWh/m²)Level
Jan4.9Bright
Feb5.8Bright
Mar6.9Intense
Apr7.6Intense
May7.7Intense
Jun7.1Intense
Jul6.8Intense
Aug6.6Intense
Sep5.6Bright
Oct5.5Bright
Nov5.0Bright
Dec4.7Bright

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
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).