Chennai residents woke up to a beautiful morning on December 18, 2025, with clear skies and comfortable temperatures setting the stage for a pleasant day across the city. The weather is ideal for stepping out, with a projected high of 27.5°C and a low of 20.9°C. This comes as a welcome relief, especially following yesterday's moderate air quality, which registered an AQI-IN value of 93. While the air quality may persist in traffic-heavy zones, the overall forecast suggests stable and enjoyable conditions for the week ahead.
Today's Weather Details and Outdoor Recommendations
The day began with a bright sunrise at 6:25 AM, promising a warm yet pleasant start. Average temperatures are expected to hover around 23.8°C with a humidity level of 70%, creating slightly humid air. Gentle winds at 22.3 km/h will ensure no major discomfort, and the chance of rain is negligible. The evening is projected to remain clear, with a cool breeze anticipated after 9 PM, perfect for a stroll along Marina Beach.
Given the favorable conditions, today is an excellent day for outdoor activities. Morning walkers are advised to enjoy the cool, sunny start, preferably in parks or less congested routes. For afternoon plans between 11 AM and 3 PM, sunglasses and sunscreen are recommended as the sun will be at its peak. Evening outings post-9 PM are ideal for open-air dining or beachside walks. A quick tip: while the weather is perfect, carrying a mask in high-traffic areas is a wise precaution against lingering pollutants.
Air Quality Analysis and Weekly Forecast
Yesterday, Chennai’s air quality was categorized as moderate, with primary pollutants including PM2.5 at 47 µg/m³ and PM10 at 61 µg/m³. A CO level of 436 µg/m³ was also recorded. While not hazardous, sensitive groups may have experienced minor discomfort. The moderate air quality is expected to linger slightly today, especially in traffic-heavy areas, but today’s sunny and windy conditions should aid in dispersing pollutants, potentially leading to a slight improvement.
An interesting insight is that yesterday’s AQI of 93 marks one of the better air quality days this month, showing a positive trend compared to earlier weeks when levels were poorer.
The Week Ahead: Consistent and Pleasant
The next six days promise stable weather with no drastic changes. Daytime temperatures will consistently range between 26°C and 28°C, while nights will be cool between 20°C and 21°C. Winds will remain gentle at 15–23 km/h, ensuring no significant disruptions.
- December 19: Sunny, high of 27.5°C, low of 20.9°C.
- December 20: Slightly cooler, high of 27.1°C, low of 20.4°C.
- December 21: Clear and bright, 20.3°C to 27°C.
- December 22: Sunny, high of 27.1°C, low of 20.1°C.
- December 23: Comfortable, 20.1°C to 27.2°C.
- December 24: Warm, high of 27.4°C, low of 20.2°C.
The upcoming weekend is highlighted as perfect for planning outdoor outings or family gatherings, taking full advantage of Chennai's pleasant December weather.
