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Average Weather in San Juan Ñumí Mexico

In San Juan Ñumí, the wet season is comfortable and overcast and the dry season is warm and partly cloudy. Over the course of the year, the temperature typically varies from 41°F to 81°F and is rarely below 35°F or above 87°F.

Climate Summary

warmcomfortableJanFebMarAprMayJunJulAugSepOctNovDec68%68%8%8%overcastclearprecipitation: 6.8 inprecipitation: 6.8 in0.1 in0.1 inmuggy: 0%muggy: 0%0%0%drydrytourism score: 5.7tourism score: 5.73.23.2
Click on each chart for more information.

Based on the tourism score, the best time of year to visit San Juan Ñumí for warm-weather activities is from mid March to mid May.

Temperature

The warm season lasts for 2.0 months, from March 19 to May 18, with an average daily high temperature above 80°F. The hottest day of the year is April 15, with an average high of 81°F and low of 51°F.

The cool season lasts for 2.8 months, from August 9 to November 1, with an average daily high temperature below 74°F. The coldest day of the year is January 5, with an average low of 41°F and high of 74°F.

Average High and Low Temperature

The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

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

Average Hourly Temperature in San Juan ÑumíJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMcoldcoldcoolcoolcomfortablewarmvery coldvery coldcoldcold
The average hourly temperature, color coded into bands: 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. The shaded overlays indicate night and civil twilight.

Cochabamba, Bolivia (3,226 miles away) is the far-away foreign place with temperatures most similar to San Juan Ñumí (view comparison).

Clouds

In San Juan Ñumí, 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 Juan Ñumí begins around November 4 and lasts for 6.3 months, ending around May 13. On February 24, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 68% of the time, and overcast or mostly cloudy 32% of the time.

The cloudier part of the year begins around May 13 and lasts for 5.7 months, ending around November 4. On June 30, the cloudiest day of the year, the sky is overcast or mostly cloudy 92% of the time, and clear, mostly clear, or partly cloudy 8% of the time.

Cloud Cover Categories

Cloud Cover Categories in San Juan ÑumíclearerclearercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Feb 2468%Feb 2468%Jun 308%Jun 308%Nov 438%Nov 438%May 1338%May 1338%clearmostly clearmostly cloudyovercastpartly cloudy
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.

Precipitation

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

The wetter season lasts 4.7 months, from May 21 to October 13, with a greater than 37% chance of a given day being a wet day. The chance of a wet day peaks at 72% on September 4.

The drier season lasts 7.3 months, from October 13 to May 21. The smallest chance of a wet day is 2% on December 8.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 72% on September 4.

Daily Chance of Precipitation

Daily Chance of Precipitation in San Juan ÑumíwetdrydryJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Sep 472%Sep 472%Dec 82%Dec 82%May 2137%May 2137%Oct 1337%Oct 1337%rain
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

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. San Juan Ñumí experiences extreme seasonal variation in monthly rainfall.

The rainy period of the year lasts for 7.1 months, from April 11 to November 13, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around September 6, with an average total accumulation of 6.8 inches.

The rainless period of the year lasts for 4.9 months, from November 13 to April 11. The least rain falls around December 11, with an average total accumulation of 0.1 inches.

Average Monthly Rainfall

The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average liquid-equivalent snowfall.

Sun

The length of the day in San Juan Ñumí varies over the course of the year. In 2018, the shortest day is December 21, with 11 hours, 5 minutes of daylight; the longest day is June 21, with 13 hours, 10 minutes of daylight.

Hours of Daylight and Twilight

Hours of Daylight and Twilight in San Juan ÑumíJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 6 minMar 2012 hr, 6 minMar 2013 hr, 10 minJun 2113 hr, 10 minJun 2112 hr, 7 minSep 2212 hr, 7 minSep 2211 hr, 5 minDec 2111 hr, 5 minDec 21nightnightday
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise is at 6:26 AM on March 31, and the latest sunrise is 1 hour, 1 minute later at 7:27 AM on October 27. The earliest sunset is at 5:54 PM on November 23, and the latest sunset is 2 hours, 15 minutes later at 8:09 PM on July 7.

Daylight saving time (DST) is observed in San Juan Ñumí during 2018, starting in the spring on April 1, lasting 6.8 months, and ending in the fall on October 28.

Sunrise & Sunset with Twilight and Daylight Saving Time

Sunrise & Sunset with Twilight and Daylight Saving Time in San Juan ÑumíJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMMar 316:26 AMMar 316:26 AM8:09 PMJul 78:09 PMJul 7Nov 235:54 PMNov 235:54 PM7:27 AMOct 277:27 AMOct 27Apr 1DSTApr 1DSTDSTOct 28DSTOct 28daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of the year 2018. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. The transitions to and from daylight saving time are indicated by the 'DST' labels.

Humidity

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 San Juan Ñumí, 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.

Humidity Comfort Levels

Humidity Comfort Levels in San Juan ÑumíJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Feb 10%Feb 10%May 310%May 310%comfortablecomfortabledrydryhumidhumid
The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.

Wind

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 Juan Ñumí experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 6.5 months, from September 22 to April 6, with average wind speeds of more than 5.7 miles per hour. The windiest day of the year is November 9, with an average hourly wind speed of 6.9 miles per hour.

The calmer time of year lasts for 5.5 months, from April 6 to September 22. The calmest day of the year is May 31, with an average hourly wind speed of 4.5 miles per hour.

Average Wind Speed

The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction in San Juan Ñumí is from the east throughout the year.

Wind Direction

Wind Direction in San Juan ÑumíJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%westsoutheastnorth
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Water Temperature

San Juan Ñumí 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 2.8 months, from June 19 to September 12, with an average temperature above 86°F. The day of the year with the warmest water is July 30, with an average temperature of 87°F.

The time of year with cooler water lasts for 3.5 months, from January 17 to May 1, with an average temperature below 83°F. The day of the year with the coolest water is March 15, with an average temperature of 82°F.

Average Water Temperature

The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

Best Time of Year to Visit

To characterize how pleasant the weather is in San Juan Ñumí 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 Juan Ñumí for general outdoor tourist activities is from mid March to mid May, with a peak score in the third week of April.

Tourism Score

Tourism Score in San Juan Ñumíbest timeJanFebMarAprMayJunJulAugSepOctNovDec02468105.75.73.23.24.04.03.73.73.63.63.43.4 precipitationprecipitationcloudscloudstemperaturetemperaturetourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

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 Juan Ñumí for hot-weather activities is from mid March to mid May, with a peak score in the third week of April.

Beach/Pool Score

Beach/Pool Score in San Juan Ñumíbest timeJanFebMarAprMayJunJulAugSepOctNovDec02468102.82.81.01.01.21.2 precipitationprecipitationcloudscloudsbeach/pool score
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).

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.

Growing Season

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).

While it does not do so every year, freezing temperatures are seen in San Juan Ñumí over some winters. The day least likely to be in the growing season is December 19, with a 54% chance.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season in San Juan Ñumígrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%90%Feb 890%Feb 890%Nov 490%Nov 454%Dec 1954%Dec 19Jul 3100%Jul 3100%coldcoolcomfortablewarmvery coldhot
The percentage of time spent in various temperature bands: 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. The black line is the percentage chance that a given day is within the growing season.

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 San Juan Ñumí should appear around January 11, only rarely appearing before January 10 or after January 13.

Growing Degree Days

Growing Degree Days in San Juan ÑumíJanFebMarAprMayJunJulAugSepOctNovDec0°F500°F1,000°F1,500°F2,000°F2,500°F3,000°F3,500°F4,000°F4,500°FJan 1190°FJan 1190°FMar 25900°FMar 25900°FMay 211,800°FMay 211,800°FDec 314,370°FDec 314,370°F
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

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 1.9 months, from March 4 to May 1, with an average daily incident shortwave energy per square meter above 6.8 kWh. The brightest day of the year is March 31, with an average of 7.2 kWh.

The darker period of the year lasts for 2.5 months, from November 3 to January 20, with an average daily incident shortwave energy per square meter below 5.5 kWh. The darkest day of the year is December 23, with an average of 5.1 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy in San Juan ÑumíbrightdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWh9 kWhMar 317.2 kWhMar 317.2 kWhDec 235.1 kWhDec 235.1 kWhNov 35.5 kWhNov 35.5 kWhJan 205.5 kWhJan 205.5 kWh
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of San Juan Ñumí are 17.397 deg latitude, -97.706 deg longitude, and 7,218 ft elevation.

The topography within 2 miles of San Juan Ñumí contains large variations in elevation, with a maximum elevation change of 2,283 feet and an average elevation above sea level of 7,250 feet. Within 10 miles contains large variations in elevation (5,105 feet). Within 50 miles also contains extreme variations in elevation (10,269 feet).

The area within 2 miles of San Juan Ñumí is covered by shrubs (48%), cropland (25%), and trees (21%), within 10 miles by trees (53%) and shrubs (37%), and within 50 miles by shrubs (41%) and trees (39%).

Data Sources

This report illustrates the typical weather in San Juan Ñumí, 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 is only a single weather station, Oaxaca - Xoxocotlán International Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of San Juan Ñumí.

At a distance of 113 kilometers from San Juan Ñumí, closer than our threshold of 150 kilometers, this station is deemed sufficiently nearby to be relied upon as our primary source for temperature and dew point records.

The station records are corrected for the elevation difference between the station and San Juan Ñumí according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

Please note that the station records themselves may additionally have been back-filled using other nearby stations or the MERRA-2 reanalysis.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , 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 aiports and weather stations are provided by AskGeo.com .

Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.

Disclaimer

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.