Climate and Average Weather Year Round in San Pedro Belize
In San Pedro, the summers are long, hot, wet, and overcast; the winters are warm and mostly clear; and it is oppressive year round. Over the course of the year, the temperature typically varies from 72°F to 88°F and is rarely below 66°F or above 90°F.
Based on the beach/pool score, the best time of year to visit San Pedro for hot-weather activities is from mid December to late April.
Climate in San Pedro
The hot season lasts for 4.0 months, from June 5 to October 6, with an average daily high temperature above 86°F. The hottest month of the year in San Pedro is August, with an average high of 88°F and low of 80°F.
The cool season lasts for 3.3 months, from December 10 to March 20, with an average daily high temperature below 82°F. The coldest month of the year in San Pedro is January, with an average low of 72°F and high of 80°F.
Average High and Low Temperature in San Pedro
The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature in San Pedro
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
In San Pedro, the average percentage of the sky covered by clouds experiences extreme seasonal variation over the course of the year.
The clearer part of the year in San Pedro begins around November 9 and lasts for 6.0 months, ending around May 7.
The clearest month of the year in San Pedro is February, during which on average the sky is clear, mostly clear, or partly cloudy 78% of the time.
The cloudier part of the year begins around May 7 and lasts for 6.0 months, ending around November 9.
The cloudiest month of the year in San Pedro is September, during which on average the sky is overcast or mostly cloudy 83% of the time.
Cloud Cover Categories in San Pedro
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in San Pedro varies significantly throughout the year.
The wetter season lasts 5.7 months, from May 28 to November 19, with a greater than 31% chance of a given day being a wet day. The month with the most wet days in San Pedro is September, with an average of 13.5 days with at least 0.04 inches of precipitation.
The drier season lasts 6.3 months, from November 19 to May 28. The month with the fewest wet days in San Pedro is April, with an average of 3.6 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 San Pedro is September, with an average of 13.5 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 50% on September 29.
Daily Chance of Precipitation in San Pedro
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. San Pedro experiences extreme seasonal variation in monthly rainfall.
Rain falls throughout the year in San Pedro. The month with the most rain in San Pedro is October, with an average rainfall of 6.3 inches.
The month with the least rain in San Pedro is March, with an average rainfall of 0.9 inches.
Average Monthly Rainfall in San Pedro
The length of the day in San Pedro varies over the course of the year. In 2023, the shortest day is December 21, with 11 hours, 3 minutes of daylight; the longest day is June 21, with 13 hours, 12 minutes of daylight.
Hours of Daylight and Twilight in San Pedro
The earliest sunrise is at 5:15 AM on June 5, and the latest sunrise is 1 hour, 11 minutes later at 6:26 AM on January 19. The earliest sunset is at 5:14 PM on November 24, and the latest sunset is 1 hour, 17 minutes later at 6:31 PM on July 7.
Daylight saving time (DST) is not observed in San Pedro during 2023.
Sunrise & Sunset with Twilight in San Pedro
The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.
Solar Elevation and Azimuth in San Pedro
The figure below presents a compact representation of key lunar data for 2023. 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.
Moon Rise, Set & Phases in San Pedro
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.
San Pedro experiences some seasonal variation in the perceived humidity.
The muggier period of the year lasts for 11 months, from February 3 to December 23, during which time the comfort level is muggy, oppressive, or miserable at least 91% of the time.
The month with the fewest muggy days in San Pedro is February, with 25.6 days that are muggy or worse.
Humidity Comfort Levels in San Pedro
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
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 San Pedro experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 7.5 months, from December 27 to August 10, with average wind speeds of more than 8.9 miles per hour. The windiest month of the year in San Pedro is June, with an average hourly wind speed of 9.8 miles per hour.
The calmer time of year lasts for 4.5 months, from August 10 to December 27. The calmest month of the year in San Pedro is September, with an average hourly wind speed of 8.0 miles per hour.
Average Wind Speed in San Pedro
The predominant average hourly wind direction in San Pedro is from the east throughout the year.
Wind Direction in San Pedro
San Pedro 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 10 to October 17, with an average temperature above 84°F. The month of the year in San Pedro with the warmest water is September, with an average temperature of 85°F.
The time of year with cooler water lasts for 3.3 months, from December 18 to March 28, with an average temperature below 81°F. The month of the year in San Pedro with the coolest water is February, with an average temperature of 80°F.
Average Water Temperature in San Pedro
To characterize how pleasant the weather is in San Pedro 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 San Pedro for general outdoor tourist activities is from mid December to mid March, with a peak score in the last week of January.
Tourism Score in San Pedro
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 San Pedro for hot-weather activities is from mid December to late April, with a peak score in the first week of March.
Beach/Pool Score in San Pedro
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 San Pedro 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.
Time Spent in Various Temperature Bands and the Growing Season in San Pedro
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
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.
Growing Degree Days in San Pedro
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 2.3 months, from March 7 to May 17, with an average daily incident shortwave energy per square meter above 6.3 kWh. The brightest month of the year in San Pedro is April, with an average of 6.8 kWh.
The darker period of the year lasts for 1.9 months, from August 26 to October 24, with an average daily incident shortwave energy per square meter below 4.7 kWh. The darkest month of the year in San Pedro is September, with an average of 4.3 kWh.
Average Daily Incident Shortwave Solar Energy in San Pedro
For the purposes of this report, the geographical coordinates of San Pedro are 17.916 deg latitude, -87.966 deg longitude, and 13 ft elevation.
The topography within 2 miles of San Pedro is essentially flat, with a maximum elevation change of 39 feet and an average elevation above sea level of 2 feet. Within 10 miles is also essentially flat (75 feet). Within 50 miles is essentially flat (407 feet).
The area within 2 miles of San Pedro is covered by water (75%) and mangroves (18%), within 10 miles by water (93%), and within 50 miles by water (71%) and trees (15%).
This report illustrates the typical weather in San Pedro, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
There are 2 weather stations near enough to contribute to our estimation of the temperature and dew point in San Pedro.
For each station, the records are corrected for the elevation difference between that station and San Pedro according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
The estimated value at San Pedro is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between San Pedro and a given station.
The stations contributing to this reconstruction are:
To get a sense of how much these sources agree with each other, you can view a comparison of San Pedro and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data.
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus.
All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.
Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.
Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.
Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .
Time zones for airports and weather stations are provided by AskGeo.com .
Maps are © OpenStreetMap contributors.
The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.
We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.
We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.
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