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Average Weather in Montego Bay Jamaica

In Montego Bay, the temperature typically varies from 73°F to 89°F over the course of the year, and is rarely below 71°F or above 91°F.

The hot season lasts for 3.7 months, from June 8 to September 30, with an average daily high temperature above 88°F. The hottest day of the year is August 2, with an average high of 89°F and low of 78°F.

The cool season lasts for 3.3 months, from December 12 to March 21, with an average daily high temperature below 84°F. The coldest day of the year is February 16, with an average low of 73°F and high of 83°F.

Average High and Low Temperature

The daily average high (red line) and low (blue line) temperature with percentile bands, 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

12 AM4 AM8 AM12 PM4 PM8 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDeccomfortablecomfortablewarmwarmhothot
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < chilly < 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.

Sun

The length of the day in Montego Bay varies over the course of the year. In 2017, the shortest day is December 21, with 11 hours, 1 minute of daylight; the longest day is June 21, with 13 hours, 14 minutes of daylight.

Hours of Daylight and Twilight

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 5:34 AM on June 4, and the latest sunrise is 1 hour, 13 minutes later at 6:46 AM on January 18. The earliest sunset is at 5:33 PM on November 25, and the latest sunset is 1 hour, 19 minutes later at 6:52 PM on July 6.

Daylight saving time (DST) is not observed in Montego Bay during 2017.

Sunrise & Sunset with Twilight

The solar day over the course of the year 2017. 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.

Clouds

In Montego Bay, 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 Montego Bay begins around November 18 and lasts for 5.7 months, ending around May 10. On January 30, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 81% of the time, and overcast or mostly cloudy 19% of the time.

The cloudier part of the year begins around May 10 and lasts for 6.3 months, ending around November 18. On June 14, the cloudiest day of the year, the sky is overcast or mostly cloudy 80% of the time, and clear, mostly clear, or partly cloudy 20% of the time.

Cloud Cover

clearerclearerclearerclearercloudiercloudier0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecJun 1480%Jun 1480%Jan 3019%Jan 3019%Nov 1850%Nov 1850%May 1050%May 1050%overcastovercastmostly cloudymostly cloudypartly cloudypartly cloudymostly clearmostly clearclearclear
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 Montego Bay varies significantly throughout the year.

The wetter season lasts 6.1 months, from May 13 to November 15, with a greater than 33% chance of a given day being a wet day. The chance of a wet day peaks at 54% on September 28.

The drier season lasts 5.9 months, from November 15 to May 13. The smallest chance of a wet day is 11% on December 27.

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 54% on September 28.

Daily Chance of Precipitation

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 in the year. Montego Bay experiences very significant seasonal variation in monthly rainfall.

Rain falls throughout the year in Montego Bay. The most rain falls during the 31 days centered around September 30, with an average total accumulation of 5.7 inches.

The least rain falls around January 9, with and average total accumulation of 0.7 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.

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 Montego Bay, 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, staying within 5% of 95% throughout.

Humidity Comfort Levels

0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecMar 1090%Mar 1090%100%Oct 7100%Oct 7miserablemiserableoppressiveoppressivemuggymuggy
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 Montego Bay experiences mildly seasonal variation over the course of the year.

The windier part of the year lasts for 4.7 months, from November 3 to March 26, with average wind speeds of more than 6.2 miles per hour. The windiest day of the year is December 23, with an average hourly wind speed of 7.3 miles per hour.

The calmer time of year lasts for 7.2 months, from March 26 to November 3. The calmest day of the year is October 2, with an average hourly wind speed of 5.1 miles per hour.

Average Wind Speed

windywindywindywindy0 mph1 mph2 mph3 mph4 mph5 mph6 mph7 mph8 mph9 mph10 mphJanFebMarAprMayJunJulAugSepOctNovDecDec 237.3 mphDec 237.3 mphOct 25.1 mphOct 25.1 mphMar 266.2 mphMar 266.2 mph
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 Montego Bay is from the east throughout the year.

Wind Direction

0%20%40%60%80%100%JanFebMarAprMayJunJulAugSepOctNovDecwestwestsouthsoutheasteastnorthnorth
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

Montego Bay 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 25 to October 30, with an average temperature above 84°F. The day of the year with the warmest water is September 9, with an average temperature of 85°F.

The time of year with cooler water lasts for 3.3 months, from January 3 to April 12, with an average temperature below 81°F. The day of the year with the coolest water is February 23, with an average temperature of 80°F.

Average Water Temperature

The daily average water temperature (purple line) with percentile bands, 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 2.1 months, from March 7 to May 9, with an average daily incident shortwave energy per square meter above 6.5 kWh. The brightest day of the year is April 12, with an average of 7.1 kWh.

The darker period of the year lasts for 6.0 months, from July 2 to January 3, with an average daily incident shortwave energy per square meter below 4.8 kWh. The darkest day of the year is September 28, with an average of 4.2 kWh.

Average Daily Incident Shortwave Solar Energy

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 Montego Bay are 18.471 deg latitude, -77.919 deg longitude, and 56 ft elevation.

The topography within 2 miles of Montego Bay contains significant variations in elevation, with a maximum elevation change of 712 feet, and an average elevation above sea level of 131 feet. Within 10 miles contains large variations in elevation (1,985 feet). Within 50 miles contains extreme variations in elevation (3,291 feet).

The area within 2 miles of Montego Bay is covered by grassland (30%), water (25%), cropland (22%), and trees (13%), within 10 miles by water (47%) and trees (26%), and within 50 miles by water (74%) and trees (13%).

Data Sources

This report illustrates the typical weather in Montego Bay, 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 Montego Bay.

For each station, the records are corrected for the elevation difference between that station and Montego Bay 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 Montego Bay is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Montego Bay and a given station.

The stations contributing to this reconstruction are: Sangster International Airport (99%, 3.7 kilometers, north) and Norman Manley International Airport (0.5%, 134 kilometers, southeast).

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 .