Last updated: August 21, 2025
October in Chennai, India ushers in a blend of warmth and humidity, with maximum temperatures reaching up to 33°C (93°F) and an average of 28°C (83°F). As the monsoon gradually recedes, the city experiences significant precipitation, totaling 169 mm (6.7 in) across approximately 21 rainy days, contributing to a moist humidity level of 79%. This month marks a transitional period, where the lingering rains meet the sultry heat, creating a unique weather phenomenon that shapes the city's vibrant atmosphere.
In October, the temperature in Chennai begins to show a slight cool-down compared to the sweltering summer months, with minimums averaging around 24°C (76°F), and maximums reaching up to 33°C (93°F). This month typically experiences a comfortable average temperature of 28°C (83°F), making it a pleasant time for locals and visitors alike. As the city transitions from the heat of the summer, the temperatures dip just enough to provide a welcome respite while still retaining a hint of warmth. The gradual decline in max temperatures from the peak summer months hints at the arrival of the post-monsoon season, inviting vibrant outdoor activities and explorations in this bustling coastal city.
October marks a significant shift in Chennai's rainfall patterns, with precipitation reaching a substantial 169 mm (6.7 in) over 21 days. This surge follows the relatively dry months preceding it, particularly September's 126 mm (5.0 in), and signals the onset of the city's northeast monsoon. The increase in rainfall not only contributes to the total annual precipitation but also enhances water supply after the preceding drier months. As the city braces for the oncoming deluge, October stands out as a pivotal time, offering both challenges and opportunities in managing water resources effectively throughout the year.
As October rolls in, Chennai experiences a slight dip in humidity, with levels averaging around 79%. This marks a subtle decline from the peak of 83% seen during the sweltering months of April and May. Throughout the year, the city's humidity remains relatively high, with January and February consistently sitting at 76%, making them the least humid months. However, as the post-monsoon season begins, October’s figures still reflect a certain mugginess, characteristic of the city's tropical climate. This gradual decrease hints at a transition towards cooler and slightly drier conditions as the city prepares for the upcoming months, while still maintaining a level of moisture that keeps its vibrant atmosphere alive.
In October, Chennai experiences a UV Index of 11, categorizing it as extreme and requiring vigilant sun protection. As the monsoon season gives way to clearer skies, the UV index begins to gradually decline from its peak in the summer months, yet it remains significant. With a recommended burn time of just 10 minutes, this month emphasizes the necessity of safeguarding your skin against harmful rays, a trend that continues from the preceding months where values hovered between 12 and 14. As the year progresses towards its end, the UV levels will eventually drop further, but in October, it's crucial to stay sun-smart. For more information, visit Chennai UV Index.
UV Risk Categories
October in Chennai shines with an impressive 308 hours of sunlight, perfectly bridging the gap between the sweltering summer and the gentle coolness of winter. After a summer packed with sunlight peaking at 352 hours in May, the city gradually experiences a slight decline in sunny days as September wraps up with 293 hours. Interestingly, October's sunshine levels remain robust, reflecting the resilient warmth that characterizes the region. The trend highlights a transition into the cooler months, with November dipping to 265 hours, yet continuing to bask in days filled with bright, invigorating rays. This gradual shift showcases not only the beauty of Chennai's climate but also its allure for those seeking warmth in the heart of autumn.
In October, Chennai experiences a notable decrease in sunny days, with only a 26% chance of sunshine, making it one of the less favorable months for clear skies. This decline follows the trend of the preceding months, where the likelihood of sun significantly drops from July's low of 18% to September's mere 13%. The city's weather transitions from the sweltering heat of summer to the onset of the monsoon, resulting in increased cloud cover and rainy days. As November approaches, it brings an even steeper decline in sunshine to just 12%, indicating that October may be a transitional period rather than an ideal month for sun-seekers.
In Chennai, India, the pattern of daylight duration reveals intriguing seasonal trends throughout the year. Beginning with January and February, the city enjoys a consistent 11 hours of daylight, setting a steady tone for the early months. As spring approaches in March, daylight extends to 12 hours, continuing through the summer months until September, which fosters long, sunlit days perfect for outdoor activities. However, as October arrives, there’s a subtle shift back to 11 hours of daylight, indicating the transition into the cooler months of the year. This pattern not only highlights the consistency in daylight but also marks a rhythmic ebb and flow, reflecting the rhythms of nature in this vibrant coastal city.
As October sweeps into Chennai, the city's winds provide a gentle transition into the cooler months. With an average wind speed of 2.8 m/s (6 mph), October marks the lowest wind activity of the year, reflecting a slight dip from the more dynamic breezes of the preceding summer months, which saw speeds of 4.1 m/s in May and 4.2 m/s in June. This calming of the winds results in a tranquil atmosphere, contrasting with the lively gusts of earlier months. As the year progresses towards November, a resurgence in wind activity is anticipated, expected to rise to 3.6 m/s (8 mph). Overall, October's subtle breezes embrace Chennai in a serene embrace, hinting at the seasonal shift just around the corner.
Weather in Chennai varies notably across the year, with each month offering distinct climate conditions. This page compares October’s weather to other months in Chennai, focusing on differences in temperature, rainfall, humidity, and UV levels.
In October, the weather is notably warmer and more humid than in January, with temperatures ranging from a minimum of 24°C (76°F) to a maximum of 33°C (93°F) and an average of 28°C (83°F). This month also experiences significant rainfall, with around 169 mm (6.7 in) of precipitation over 21 days, contributing to the higher humidity level of 79%. In contrast, January presents a cooler climate, with temperatures ranging from a minimum of 20°C (68°F) to a maximum of 30°C (86°F) and an average of 25°C (78°F). Additionally, January sees much lower precipitation, totaling just 32 mm (1.3 in) over 5 days, along with slightly reduced humidity at 76%. For a more detailed look at the January weather in Chennai, you can visit Chennai weather in January.
In comparing the weather of October and February, October tends to be warmer and more humid, with average temperatures ranging from a minimum of 24°C (76°F) to a maximum of 33°C (93°F). It also experiences significantly higher precipitation, with 169 mm (6.7 in) of rainfall spread over 21 days. In contrast, February is milder, with temperatures varying from a minimum of 20°C (68°F) to a maximum of 31°C (88°F) and minimal rain, only accumulating 10 mm (0.4 in) over just 1 day. The humidity levels in February remain relatively high at 76%. For more details, you can check the Chennai weather in February.
In October, the weather is characterized by slightly warmer temperatures, with a minimum of 24°C and an average of 28°C, peaking at a maximum of 33°C. However, this month experiences considerable rainfall, totaling 169 mm over 21 days, contributing to a high humidity level of 79%. In contrast, March offers a marginally cooler minimum temperature of 22°C, with the same average of 28°C but a higher maximum of 35°C. Significantly, March sees only minimal rainfall of just 6 mm over a single day, and humidity remains comparable at 81%. For a detailed look at the climate specifics in March, you can check out this link: Chennai weather in March.
In October, the weather in Chennai is characterized by slightly lower temperatures, with a minimum of 24°C (76°F) and an average of 28°C (83°F), compared to April, where the minimum is 25°C (78°F) and the average reaches 30°C (86°F). October tends to be more humid, with a humidity level of 79%, while April has a slightly higher humidity level of 83%. However, October sees a significant increase in precipitation, receiving 169 mm (6.7 in) over 21 days, compared to a mere 8 mm (0.3 in) over just 1 day in April. For more details on April weather, check out Chennai weather in April.
When comparing October and May weather, October presents milder temperatures with a minimum of 24°C (76°F) and an average of 28°C (83°F), while May is hotter, featuring a minimum of 26°C (78°F) and an average of 31°C (88°F). The maximum temperatures in May can soar up to 38°C (100°F), making it noticeably warmer than October's maximum of 33°C (93°F). Precipitation also varies significantly; October experiences 169 mm (6.7 in) over 21 days, reflecting a wetter climate, whereas May is relatively dry with only 13 mm (0.5 in) over 3 days. Both months have high humidity, with October at 79% and May slightly higher at 83%. For more details, check out Chennai weather in May.
When comparing the weather in October and June, October tends to be slightly cooler with minimum temperatures around 24°C (76°F) and an average of 28°C (83°F), while June sees higher minimums starting at 26°C (80°F) and an average of 31°C (88°F). June experiences maximum temperatures that can reach up to 37°C (99°F), making it significantly hotter than October’s maximum of 33°C (93°F). However, October brings with it a much higher level of rainfall, recording about 169 mm (6.7 in) over 21 days compared to June's 64 mm (2.5 in) over 12 days. Interestingly, both months maintain high humidity levels, with October at 79% and June slightly higher at 81%. For more details on June weather patterns, you can check Chennai weather in June.
In October, the weather tends to be slightly cooler than in July, with minimum temperatures averaging 24°C (76°F) compared to July's 26°C (79°F). The average temperature in October is 28°C (83°F), while July sees a higher average of 30°C (86°F). Additionally, October experiences greater precipitation, with 169 mm (6.7 in) over 21 days, compared to July’s 107 mm (4.2 in) over 16 days. Humidity levels remain similar, with October at 79% and July at 80%. For a more detailed look at the weather in July, visit Chennai weather in July.
In comparing the weather between October and August, October tends to be slightly cooler, with average temperatures ranging from a minimum of 24°C (76°F) to a maximum of 33°C (93°F), compared to August's minimum of 26°C (79°F) and maximum of 35°C (95°F). Both months experience considerable humidity, with October at 79% and August slightly higher at 82%. However, October is wetter, receiving 169 mm (6.7 in) of precipitation over 21 days, while August sees less rainfall at 125 mm (4.9 in) across 19 days. For more details on August weather, refer to Chennai weather in August.
In comparing the weather between October and September, we see that October experiences a slight decrease in average temperature, with a minimum of 24°C (76°F) and an average of 28°C (83°F), while September has a minimum of 25°C (77°F) and an average of 29°C (84°F). Interestingly, both months have the same maximum temperature of 34°C (93°F). Rainfall is notably heavier in October, with 169 mm (6.7 in) of precipitation over 21 days, compared to September's 126 mm (5.0 in) over 19 days. Humidity remains relatively high in both months, with October at 79% and September slightly higher at 81%. For more details on September weather, you can refer to Chennai weather in September.
October and November weather in Chennai exhibit some intriguing similarities and differences. In October, temperatures range from a minimum of 24°C (76°F) to a maximum of 33°C (93°F), with an average of 28°C (83°F). The month experiences significant rainfall, with 169 mm (6.7 in) over 21 days and a humidity level of 79%. In contrast, November sees slightly cooler temperatures with a minimum of 23°C (74°F) and a maximum of 32°C (90°F), averaging 27°C (81°F). However, November is characterized by much heavier rainfall, accumulating 377 mm (14.9 in) across 20 days, while maintaining a humidity level of 80%. For more details on the weather conditions, visit Chennai weather in November.
October and December showcase distinct differences in weather patterns. October tends to be warmer, with temperatures ranging from a minimum of 24°C (76°F) to a maximum of 33°C (93°F) and an average of 28°C (83°F). In contrast, December experiences slightly cooler temperatures, peaking at 30°C (87°F) and averaging around 26°C (79°F) while maintaining a minimum of 22°C (71°F). Additionally, October is characterized by higher precipitation, with 169 mm (6.7 in) over 21 rainy days, compared to December's 109 mm (4.3 in) over just 10 days. Humidity remains relatively stable between the two months, with October at 79% and December slightly lower at 78%. For more detailed information, you can check Chennai weather in December.
As October arrives in Chennai, the weather begins to shift, offering a welcome respite from the intense summer heat. With average temperatures hovering around a comfortable 28°C (83°F), it contrasts notably with the sweltering summer months. Precipitation becomes a frequent guest, as the city experiences 21 days of rain, accumulating around 169 mm (6.7 in), which significantly shapes the landscape and humidity levels that soar to 79%. This blend of warmth and moisture heralds the onset of the monsoon's final throes, making October a dynamic month for weather enthusiasts. Embrace the unique charm of Chennai's October climate and explore more about the city's varied seasons at Chennai Climate.