Chennai, December 18, 2025, is experiencing a day of clear skies and comfortable temperatures, with a projected high of 27.5°C and a low of 20.9°C, making it suitable for outdoor activities despite yesterday’s moderate air quality, which registered an AQI-IN value of 93 and may persist in traffic-heavy areas, prompting advice to carry masks. The week ahead promises stable weather conditions, with temperatures consistently ranging between 26°C and 28°C during the day and 20°C to 21°C at night, marking a positive trend in air quality compared to earlier in the month.
Today’s Weather Details
The day commenced with a bright sunrise at 6:25 AM, signaling a warm yet pleasant start for the city. Temperatures were expected to hover around 23.8°C on average, with a humidity level of 70% contributing to slightly humid air. Winds were gentle at 22.3 km/h, ensuring no significant discomfort for residents throughout the day. The chances of rain were negligible, allowing for uninterrupted outdoor plans without concerns about showers. As the evening progresses, the skies are projected to remain clear, with a cool breeze anticipated to pick up after 9 PM, creating an opportune time for a stroll along the Marina Beach.
Yesterday’s Air Quality
Yesterday, Chennai’s air quality was categorized as moderate, with an AQI-IN value of 93. The primary pollutants identified included PM2.5 at 47 µg/m³ and PM10 at 61 µg/m³. Additionally, a CO level of 436 µg/m³ was noted in the city’s atmosphere. While the air quality was not deemed hazardous, sensitive groups may have experienced minor respiratory discomfort due to these levels.
Today’s Air Quality Outlook
The moderate air quality from yesterday was expected to slightly linger today, particularly in traffic-heavy areas across the city. However, today’s sunny and windy conditions were anticipated to aid in dispersing pollutants. This dispersion could potentially lead to a slight improvement in overall air quality. Despite potential improvements, early morning traffic might still elevate pollution levels in specific zones.“A quick tip: while the weather is perfect for a walk, carrying a mask might be wise in congested zones.”
Outdoor Activity Recommendations
With favorable weather conditions, today presented an opportune time for outdoor plans, and specific recommendations were provided to maximize enjoyment and safety. For morning walkers, the cool and sunny morning was highlighted as ideal for daily routines. It was suggested to opt for parks or less congested routes to avoid traffic pollution. Those with afternoon plans, especially between 11 AM and 3 PM, were advised to use sunglasses and sunscreen as the sun would be at its peak. Evening outings were recommended to take advantage of the cool breeze picking up post 9 PM, described as a great time for open-air dining or a beachside stroll. Commuters traveling through high-traffic zones were reminded to keep their masks handy to minimize exposure to lingering pollutants.
The Week Ahead
Looking ahead, the next six days were projected to maintain consistent weather patterns, with no drastic changes expected in the coming week. Temperatures were forecast to remain steady, ranging between 26°C and 28°C during the day. Nighttime temperatures were expected to be between 20°C and 21°C. Winds would continue to be gentle, averaging 15–23 km/h, ensuring no significant weather disruptions.December 19 was forecast to have sunny skies, with highs of 27.5°C and lows of 20.9°C. December 20 was expected to be slightly cooler, with a high of 27.1°C and a low of 20.4°C. December 21 was predicted to be clear and bright, with temperatures ranging between 20.3°C and 27°C. December 22 was forecast as sunny, with highs of 27.1°C and lows of 20.1°C. December 23 was expected to be comfortable, with temperatures between 20.1°C and 27.2°C. December 24 was predicted to be warm, with highs of 27.4°C and lows of 20.2°C. The upcoming weekend was highlighted as perfect for outdoor activities, encouraging planning for outings or family gatherings.
Air Quality Trend
An interesting insight revealed that yesterday’s AQI of 93 marked one of the better air quality days this month. This was particularly notable when compared to earlier weeks, during which levels had soared to poor and very poor categories. While moderate air quality still presents a concern, it was identified as a step in the right direction for Chennai’s pollution levels.Data referenced in this article is taken from AQI.in.
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