Chennai Weather by Month: When Is the Best Time to Visit?

What is Chennai's climate like overall?

Chennai has a tropical climate with a hot, humid year and one main rainy season. Wikipedia gives average annual rainfall of about 120 cm, with most of it falling between October and December when the northeast monsoon is active. March is the driest month, averaging only a few millimetres, and October is the wettest at around 278 mm in the figures quoted there.

The Incredible India website lists January as the coolest month, at about 18.9 to 31.6 degrees C, and May as the hottest, at about 24.7 to 41.7 degrees C. It names October to January as the best window for visiting, when temperatures are moderate. Day-to-day weather varies, so check a forecast from the India Meteorological Department before you travel.

January and February: the comfortable months

These are the best months for walking around. The Marina promenade, the Fort and the museums are easier in cooler air, and evenings are pleasant. January is also the month of Pongal, so some days are festive and busy. Plan train tickets and rooms early for the days around Pongal.

Rooftop evenings are a good fit for this season. Hotel Royal Park has a rooftop garden terrace with lawn seating and parasol tables, and the desk can tell you about timings. Rates start at Rs 1,600 per room per night and should be reconfirmed when you book.

Wikipedia gives winter temperatures in the range of 19 to 25 degrees C for the coldest months, December and January, which is mild by most standards. A light layer is enough for early mornings and evenings, and for strongly air-conditioned trains.

March to June: heat and humidity

From March, temperatures climb. Wikipedia describes the hottest months, April to June, at about 35 to 40 degrees C, with a record of 45 degrees C on 31 May 2003. Humidity along the coast makes it feel heavier. Outdoor sightseeing is best done before about 10 AM, with the afternoon spent indoors.

A room with air conditioning matters more than almost any other feature at this time of year, and every room at Hotel Royal Park is listed as air conditioned. Carry water, wear light cotton and use sunscreen and a hat.

• Sightsee early, rest in the middle of the day.
• Drink water regularly, even if you do not feel thirsty.
• Avoid carrying heavy luggage in the afternoon sun.
• Plan a late-afternoon walk after about 4 PM.

July to September: warm, with some showers

These months sit between the hottest period and the main rains. Chennai receives less rain from the southwest monsoon than much of India, so the weather is mostly warm and humid with occasional showers. It is not a peak tourist period, which can mean easier bookings.

Carry a compact umbrella and keep electronics in a dry bag. Check the forecast before outdoor plans such as a day trip to Mahabalipuram.

October to December: the northeast monsoon

Wikipedia notes that the northeast monsoon runs from October to December, and that 50 to 60 percent of Tamil Nadu's annual rain comes from it. Chennai gets most of its rain in this period, and heavy showers can slow roads, trains and flights. The India Meteorological Department issues heavy rainfall and thunderstorm warnings for the region, which are worth checking before you leave.

If you travel at this time, allow extra margin. Add time to every ride, avoid tight rail connections and carry a rain jacket. Staying near the station and on a main road such as Anna Salai helps, since rides are shorter. Chennai Central is about 10 to 15 minutes and Egmore about 10 minutes from Hotel Royal Park in normal traffic.

So when should you go?

For comfort, choose November to February. For fewer crowds and lower hotel demand, July to September are options if you accept warm weather. For festivals, see the dates for Pongal in January and the music season from November to January. If you must travel in summer, stay somewhere cool and plan your sightseeing early.

Whatever the month, call ahead. The hotel's number is +91 73059 49923, and hourly booking is available on request for those who need a rest between trains or flights. Check-in is at 1 PM and check-out at 11 AM.

One more practical tip: when you pack, think about the interior as well as the outdoors. Trains, malls and hotel rooms are often cold when the air conditioning is on, while the street outside may be hot and sticky. A thin layer in your day bag is useful in any season.

Check the forecast again two days before departure and on the morning you travel. In the northeast monsoon months especially, conditions can change fast, and an updated plan saves a wet and stressful day.