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Average Weather in Chennai India

In Chennai, the temperature typically varies from 71°F to 98°F over the course of the year, and is rarely below 68°F or above 103°F.

The hot season lasts for 67 days, from April 28 to July 4, with an average daily high temperature above 95°F. The hottest day of the year is May 24, with an average high of 98°F and low of 83°F.

The cool season lasts for 105 days, from November 1 to February 14, with an average daily high temperature below 86°F. The coldest day of the year is January 17, with an average low of 71°F and high of 84°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 AMJanFebMarAprMayJunJulAugSepOctNovDeccomfortablecomfortablewarmwarmhothotswelteringsweltering
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 Chennai does not vary substantially over the course of the year, staying within 53 minutes of 12 hours throughout. In 2017, the shortest day is December 21, with 11 hours, 21 minutes of daylight; the longest day is June 21, with 12 hours, 54 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 5:41 AM on June 1, and the latest sunrise is 55 minutes later at 6:35 AM on January 23. The earliest sunset is at 5:38 PM on November 20, and the latest sunset is 1 hour, 1 minute later at 6:39 PM on July 9.

Daylight saving time (DST) is not observed in Chennai 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 Chennai, 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 Chennai begins around November 5 and lasts for 169 days, ending around April 23. On February 20, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 64% of the time, and overcast or mostly cloudy 36% of the time.

The cloudier part of the year begins around April 23 and lasts for 196 days, ending around November 5. On June 22, the cloudiest day of the year, the sky is overcast or mostly cloudy 97% of the time, and clear, mostly clear, or partly cloudy 3% of the time.

Cloud Cover

clearerclearerclearerclearercloudiercloudier0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecJun 2297%Jun 2297%Feb 2036%Feb 2036%Nov 566%Nov 566%Apr 2366%Apr 2366%overcastovercastmostly cloudymostly 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 Chennai varies very significantly throughout the year.

The wetter season lasts 156 days, from July 5 to December 8, with a greater than 28% chance of a given day being a wet day. The chance of a wet day peaks at 54% on November 3.

The drier season lasts 209 days, from December 8 to July 5. The smallest chance of a wet day is 2% on January 31.

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 November 3.

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. Chennai experiences very significant seasonal variation in monthly rainfall.

The rainy period of the year lasts for 292 days, from April 5 to January 22, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around November 6, with an average total accumulation of 12.1 inches.

The rainless period of the year lasts for 73 days, from January 22 to April 5. The least rain falls around March 16, with and average total accumulation of 0.4 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.

Chennai experiences some seasonal variation in the perceived humidity.

The muggier period of the year lasts for 325 days, from February 5 to December 27, during which time the comfort level is muggy, oppressive, or miserable at least 87% of the time. The muggiest day of the year is April 25, with muggy conditions 100% of the time.

The least muggy day of the year is January 15, with muggy conditions 82% of the time.

Humidity Comfort Levels

muggymuggy0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecJan 1582%Jan 1582%100%Apr 25100%Apr 25Dec 2787%Dec 2787%miserablemiserableoppressiveoppressivemuggymuggydrydry
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 Chennai experiences mildly seasonal variation over the course of the year.

The windier part of the year lasts for 159 days, from March 24 to August 30, with average wind speeds of more than 5.3 miles per hour. The windiest day of the year is June 19, with an average hourly wind speed of 6.4 miles per hour.

The calmer time of year lasts for 206 days, from August 30 to March 24. The calmest day of the year is October 10, with an average hourly wind speed of 4.2 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 Chennai varies throughout the year.

The wind is most often from the south for 86 days, from March 11 to June 5 and for 28 days, from September 11 to October 9, with a peak percentage of 81% on April 24. The wind is most often from the west for 98 days, from June 5 to September 11, with a peak percentage of 67% on July 1. The wind is most often from the east for 153 days, from October 9 to March 11, with a peak percentage of 82% on January 24.

Wind Direction

EESSWWSSEE0%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

Chennai 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 102 days, from March 31 to July 11, with an average temperature above 84°F. The day of the year with the warmest water is May 3, with an average temperature of 85°F.

The time of year with cooler water lasts for 65 days, from December 11 to February 14, with an average temperature below 81°F. The day of the year with the coolest water is January 9, 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 67 days, from February 9 to April 17, with an average daily incident shortwave energy per square meter above 6.3 kWh. The brightest day of the year is March 16, with an average of 6.9 kWh.

The darker period of the year lasts for 183 days, from May 20 to November 19, with an average daily incident shortwave energy per square meter below 4.7 kWh. The darkest day of the year is June 9, with an average of 4.1 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 Chennai are 13.088 deg latitude, 80.278 deg longitude, and 23 ft elevation (map ).

The topography within 2 miles of Chennai is essentially flat, with a maximum elevation change of 89 feet, and an average elevation above sea level of 23 feet. Within 10 miles contains only modest variations in elevation (295 feet). Within 50 miles contains large variations in elevation (2,887 feet).

The area within 2 miles of Chennai is covered by artificial surfaces (83%) and water (17%), within 10 miles by water (48%) and artificial surfaces (42%), and within 50 miles by water (61%) and cropland (32%).

Data Sources

This report illustrates the typical weather in Chennai, 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, Chennai International Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Chennai.

At a distance of 15 kilometers from Chennai, 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 Chennai 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 .