Chennai weather forecast: Pachy rain, warm temperatures & high humidity; AQI update

Chennai is forecast for a damp and warm Sunday, January 25, 2026, with moderate rain expected and temperatures remaining in the mid-20s, accompanied by high humidity. Yesterday's air quality was categorized as "moderate" by Indian AQI standards, with an AQI-IN of 99, which may cause discomfort for sensitive groups, especially when combined with the humid, rainy conditions. Individuals are advised to carry an umbrella and keep a mask available for stretches with heavy traffic. The week ahead indicates continued rain on Monday before transitioning to a sunny and more outdoor-friendly pattern from Tuesday through Saturday.

Today's weather is characterized as warm, humid, and prone to rain. The high temperature is expected to reach 26.8°C, with a low of 23.5°C. The average temperature will be near 24.8°C, indicating that there will not be a sharp cool-down even after dark.


Humidity levels will remain elevated at approximately 77 percent. This level of humidity typically makes Chennai’s air feel heavier than what the thermometer suggests. Winds may increase at times, reaching a maximum speed of around 23 kilometers per hour. These winds could offer brief relief between showers, but they are also capable of pushing rain bands across different neighborhoods quickly.

Rain is a significant feature of today's forecast. The city has an 86 percent chance of experiencing rain, with about 5.31 millimeters of total precipitation anticipated. This amount of precipitation points to intermittent spells rather than all-day flooding rain. However, it is expected to be enough to slow traffic and keep roads slick.

Days with "moderate rain" in Chennai often follow a familiar rhythm. This typically includes a muggy morning, with showers building from late morning into the afternoon. Another burst of rain is possible around early evening, coinciding with commuter travel times. Residents should keep an eye out for sudden downpours rather than a steady drizzle.

On the skies-and-light front, sunrise is scheduled for 6:36 AM. Sunset will occur at 6:07 PM. Those who prefer an early walk or outdoor exercise are encouraged to complete these activities earlier in the morning. This is before showers become more likely and the humidity peaks.

Yesterday's Air Quality

Looking back at Saturday, January 24, Chennai recorded an AQI-IN of 99. This was classified as "Moderate" and fell into category 2. The corresponding AQI-US was 142.
"moderate"
This level of air quality can cause throat irritation or breathlessness for some people. This is particularly true for those with pre-existing conditions such as asthma, COPD, or allergies. Particulate pollution was a notable factor in yesterday's air quality. PM2.5 levels were recorded at 56, and PM10 levels were 69. Both of these particulate matter levels can aggravate cough and wheeze, especially near busy junctions and construction corridors. Carbon monoxide (CO) stood at 323, contributing to the overall pollution load, but particulate matter remained the primary concern.
The good news is that today’s rain and breezier periods often help wash out dust and fine particles. This process can lead to an improvement in short-term air quality. The flip side is that high humidity can trap pollutants near the ground between showers. Therefore, individuals may still notice "heavy" air during calm spells, particularly in dense traffic zones.

Daily Preparations

"carry-the-essentials"
Planning for the day involves carrying essential items. An umbrella or a rain jacket is considered non-negotiable. Waterproof footwear is also helpful, especially for those using public transport or walking short distances.
Because yesterday’s air was only moderately clean, considering a mask during peak traffic hours is advisable. This is particularly relevant for those commuting by two-wheeler or waiting at bus stops. If scheduling errands, it is recommended to aim for mid-morning. This is before the heaviest-looking clouds build up. It is also wise to keep buffer time for slower roads. Indoors, individuals sensitive to air quality may find it beneficial to keep windows closed during traffic peaks. They can then ventilate after a shower when the air can feel fresher.

The Week Ahead

The week ahead indicates that Chennai will remain unsettled for one more day. Monday, January 26, again calls for "moderate rain". Temperatures are expected to rise slightly, with a high of 28.6°C and a low of 22.6°C. There is another high chance of rain, at 88 percent, with about 5.07 millimeters of precipitation expected.
From Tuesday, January 27, through Saturday, January 31, the forecast shifts to a much more outdoor-friendly pattern. Sunny skies are predicted every day during this period. High temperatures will be around 28.2–28.6°C. Nights will gradually become cooler, easing down to about 20.4–20.8°C by the weekend. This window, from Tuesday to Friday, appears to be the cleanest and simplest for planning outdoor activities. These activities could include a beach walk, a family outing, or any long outdoor task. During this time, keeping hydration and sunscreen in mind for the afternoon sun is recommended.
One small bonus is that after a couple of wet days, the run of sunshine should help roads dry out. This will also reduce the "damp" discomfort, even though Chennai will remain warm.
Data referenced in this article is taken from AQI.in.
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