Climate and Average Weather Year Round in Loreto Mexico

In Loreto, the summers are long, hot, and oppressive; the winters are comfortable; and it is dry and partly cloudy year round. Over the course of the year, the temperature typically varies from 58°F to 95°F and is rarely below 53°F or above 99°F.

Based on the beach/pool score, the best times of year to visit Loreto for hot-weather activities are from mid May to late June and for the entire month of October.

The hot season lasts for 4.1 months, from June 3 to October 6, with an average daily high temperature above 91°F. The hottest month of the year in Loreto is August, with an average high of 95°F and low of 83°F.

The cool season lasts for 3.3 months, from November 30 to March 7, with an average daily high temperature below 77°F. The coldest month of the year in Loreto is January, with an average low of 58°F and high of 73°F.

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

The clearer part of the year in Loreto begins around April 15 and lasts for 2.7 months, ending around July 4.

The clearest month of the year in Loreto is June, during which on average the sky is clear, mostly clear, or partly cloudy 82% of the time.

The cloudier part of the year begins around July 4 and lasts for 9.3 months, ending around April 15.

The cloudiest month of the year in Loreto is August, during which on average the sky is overcast or mostly cloudy 56% of the time.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Loreto varies throughout the year.

The wetter season lasts 1.6 months, from August 8 to September 27, with a greater than 9% chance of a given day being a wet day. The month with the most wet days in Loreto is September, with an average of 4.0 days with at least 0.04 inches of precipitation.

The drier season lasts 10 months, from September 27 to August 8. The month with the fewest wet days in Loreto is April, with an average of 0.1 days with at least 0.04 inches of precipitation.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The month with the most days of rain alone in Loreto is September, with an average of 4.0 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 18% on September 6.

Rainfall

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Loreto experiences some seasonal variation in monthly rainfall.

The rainy period of the year lasts for 3.1 months, from July 17 to October 22, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain in Loreto is September, with an average rainfall of 1.8 inches.

The rainless period of the year lasts for 8.9 months, from October 22 to July 17. The month with the least rain in Loreto is April, with an average rainfall of 0.0 inches.

The length of the day in Loreto varies over the course of the year. In 2024, the shortest day is December 21, with 10 hours, 31 minutes of daylight; the longest day is June 20, with 13 hours, 46 minutes of daylight.

The earliest sunrise is at 5:32 AM on June 8, and the latest sunrise is 1 hour, 41 minutes later at 7:14 AM on January 12. The earliest sunset is at 5:33 PM on November 29, and the latest sunset is 1 hour, 48 minutes later at 7:21 PM on July 2.

Daylight saving time (DST) is not observed in Loreto during 2024.

The figure below presents a compact representation of key lunar data for 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases.

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

Loreto experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 5.1 months, from May 31 to November 2, during which time the comfort level is muggy, oppressive, or miserable at least 25% of the time. The month with the most muggy days in Loreto is August, with 30.1 days that are muggy or worse.

The month with the fewest muggy days in Loreto is February, with 0.3 days that are muggy or worse.

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed in Loreto experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 5.4 months, from November 11 to April 23, with average wind speeds of more than 7.9 miles per hour. The windiest month of the year in Loreto is December, with an average hourly wind speed of 9.1 miles per hour.

The calmer time of year lasts for 6.6 months, from April 23 to November 11. The calmest month of the year in Loreto is August, with an average hourly wind speed of 6.6 miles per hour.

The predominant average hourly wind direction in Loreto varies throughout the year.

The wind is most often from the west for 7.0 months, from March 16 to October 16, with a peak percentage of 67% on May 29. The wind is most often from the north for 5.0 months, from October 16 to March 16, with a peak percentage of 68% on January 1.

Loreto is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average water temperature experiences some seasonal variation over the course of the year.

The time of year with warmer water lasts for 3.2 months, from July 15 to October 22, with an average temperature above 81°F. The month of the year in Loreto with the warmest water is September, with an average temperature of 84°F.

The time of year with cooler water lasts for 4.0 months, from December 21 to April 20, with an average temperature below 70°F. The month of the year in Loreto with the coolest water is February, with an average temperature of 66°F.

To characterize how pleasant the weather is in Loreto throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best times of year to visit Loreto for general outdoor tourist activities are from early February to early June and from mid October to late December, with a peak score in the third week of April.

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best times of year to visit Loreto for hot-weather activities are from mid May to late June and for the entire month of October, with a peak score in the first week of June.

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

Temperatures in Loreto are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy experiences significant seasonal variation over the course of the year.

The brighter period of the year lasts for 2.5 months, from April 18 to July 3, with an average daily incident shortwave energy per square meter above 7.4 kWh. The brightest month of the year in Loreto is May, with an average of 8.0 kWh.

The darker period of the year lasts for 2.9 months, from November 7 to February 3, with an average daily incident shortwave energy per square meter below 4.8 kWh. The darkest month of the year in Loreto is December, with an average of 4.0 kWh.

For the purposes of this report, the geographical coordinates of Loreto are 26.012 deg latitude, -111.349 deg longitude, and 26 ft elevation.

The topography within 2 miles of Loreto contains significant variations in elevation, with a maximum elevation change of 587 feet and an average elevation above sea level of 48 feet. Within 10 miles contains significant variations in elevation (3,419 feet). Within 50 miles also contains extreme variations in elevation (5,427 feet).

The area within 2 miles of Loreto is covered by shrubs (66%) and water (32%), within 10 miles by shrubs (53%) and water (47%), and within 50 miles by shrubs (53%) and water (47%).