Climate and Average Weather Year Round in Guanajuato Mexico

In Guanajuato, the wet season is warm and overcast and the dry season is comfortable and partly cloudy. Over the course of the year, the temperature typically varies from 39°F to 83°F and is rarely below 34°F or above 89°F.

Based on the tourism score, the best time of year to visit Guanajuato for warm-weather activities is from late April to mid June.

The warm season lasts for 2.2 months, from April 6 to June 13, with an average daily high temperature above 80°F. The hottest month of the year in Guanajuato is May, with an average high of 83°F and low of 54°F.

The cool season lasts for 2.2 months, from November 29 to February 6, with an average daily high temperature below 71°F. The coldest month of the year in Guanajuato is January, with an average low of 40°F and high of 69°F.

In Guanajuato, 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 Guanajuato begins around October 25 and lasts for 7.6 months, ending around June 13.

The clearest month of the year in Guanajuato is February, during which on average the sky is clear, mostly clear, or partly cloudy 62% of the time.

The cloudier part of the year begins around June 13 and lasts for 4.4 months, ending around October 25.

The cloudiest month of the year in Guanajuato is September, during which on average the sky is overcast or mostly cloudy 78% 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 Guanajuato varies very significantly throughout the year.

The wetter season lasts 3.7 months, from June 6 to September 27, with a greater than 32% chance of a given day being a wet day. The month with the most wet days in Guanajuato is July, with an average of 17.9 days with at least 0.04 inches of precipitation.

The drier season lasts 8.3 months, from September 27 to June 6. The month with the fewest wet days in Guanajuato is March, with an average of 0.9 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 Guanajuato is July, with an average of 17.9 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 61% on July 14.

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. Guanajuato experiences extreme seasonal variation in monthly rainfall.

The rainy period of the year lasts for 5.9 months, from May 6 to November 2, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain in Guanajuato is July, with an average rainfall of 4.8 inches.

The rainless period of the year lasts for 6.1 months, from November 2 to May 6. The month with the least rain in Guanajuato is December, with an average rainfall of 0.2 inches.

The length of the day in Guanajuato varies over the course of the year. In 2024, the shortest day is December 21, with 10 hours, 51 minutes of daylight; the longest day is June 20, with 13 hours, 25 minutes of daylight.

The earliest sunrise is at 6:02 AM on June 6, and the latest sunrise is 1 hour, 22 minutes later at 7:24 AM on January 16. The earliest sunset is at 6:02 PM on November 26, and the latest sunset is 1 hour, 28 minutes later at 7:30 PM on July 4.

Daylight saving time (DST) is not observed in Guanajuato 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.

The perceived humidity level in Guanajuato, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, remaining a virtually constant 0% throughout.

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 Guanajuato experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 4.3 months, from June 10 to October 18, with average wind speeds of more than 8.6 miles per hour. The windiest month of the year in Guanajuato is September, with an average hourly wind speed of 9.4 miles per hour.

The calmer time of year lasts for 7.7 months, from October 18 to June 10. The calmest month of the year in Guanajuato is December, with an average hourly wind speed of 7.8 miles per hour.

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

The wind is most often from the west for 3.9 months, from January 16 to May 12, with a peak percentage of 55% on March 28. The wind is most often from the east for 8.1 months, from May 12 to January 16, with a peak percentage of 41% on January 1.

To characterize how pleasant the weather is in Guanajuato 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 time of year to visit Guanajuato for general outdoor tourist activities is from late April to mid June, with a peak score in the third week of May.

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Guanajuato for hot-weather activities is from late April to early June, with a peak score in the third week of May.

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).

The growing season in Guanajuato typically lasts for 11 months (327 days), from around January 28 to around December 19, rarely starting after March 8, or ending before November 3.

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.

Based on growing degree days alone, the first spring blooms in Guanajuato should appear around January 16, only rarely appearing before January 13 or after January 21.

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 some seasonal variation over the course of the year.

The brighter period of the year lasts for 2.9 months, from March 19 to June 16, with an average daily incident shortwave energy per square meter above 7.0 kWh. The brightest month of the year in Guanajuato is May, with an average of 7.6 kWh.

The darker period of the year lasts for 2.4 months, from November 15 to January 27, with an average daily incident shortwave energy per square meter below 5.2 kWh. The darkest month of the year in Guanajuato is December, with an average of 4.7 kWh.

For the purposes of this report, the geographical coordinates of Guanajuato are 21.019 deg latitude, -101.259 deg longitude, and 6,594 ft elevation.

The topography within 2 miles of Guanajuato contains very significant variations in elevation, with a maximum elevation change of 1,568 feet and an average elevation above sea level of 6,978 feet. Within 10 miles contains very significant variations in elevation (3,829 feet). Within 50 miles also contains extreme variations in elevation (4,203 feet).

The area within 2 miles of Guanajuato is covered by grassland (42%), shrubs (34%), and artificial surfaces (22%), within 10 miles by grassland (42%) and shrubs (29%), and within 50 miles by grassland (42%) and cropland (25%).