Doors open before dawn

, often around five, and the first ritual of the day wakes the deity. This is the best hour to be there: cool, uncrowded, with the oil lamps still doing most of the lighting and the nadaswaram and thavil — the temple oboe and drum — sounding in the corridors.

Temples close in the middle of the day

, usually from around noon to four. This is not negotiable and it catches out visitors constantly. Use the afternoon for the museum, the bazaar, lunch and a sleep, exactly as the town does.

Evening reopening through to nine or ten

is the second good window, and often the liveliest. Families come after work, the lamps are lit, and there is usually music.

The night ceremony at Madurai

— around half past nine, when Sundareswarar is carried in procession to Meenakshi''s bedchamber — is the single best thing on this trail and very few tourists are there for it. Stay in the temple until closing.

At Tiruvannamalai, the girivalam

— the fourteen-kilometre circuit of the sacred hill — is walked on full moon nights by enormous crowds, barefoot, through the night. It takes four to five hours at a pilgrim''s pace. Any night of the month works if you want it quieter.

At Tirumala, the queue is the day

Darshan at Venkateswara runs continuously and waits are measured in hours, managed through queue halls. Plan a whole day for it and nothing else.

Festivals dominate the calendar

Chithirai at Madurai in April–May, Vaikuntha Ekadashi at Srirangam in December–January, Karthigai Deepam at Tiruvannamalai in November–December, Natyanjali at Chidambaram around Maha Shivaratri. Each is spectacular and each fills the town completely.

Chennai

is the northern gateway. Kanchipuram is about two hours away, Mahabalipuram''s shore temples an hour, and Tiruvannamalai around four. Tirumala is a longer haul south-west, or reached from Tirupati town, which has an airport and a major station.

Tiruchirappalli

sits in the middle of everything and has an airport. Srirangam is effectively part of the city. Thanjavur is an hour, Chidambaram around three, Darasuram and Gangaikondacholapuram in between.

Madurai

anchors the south, with its own airport. Rameswaram is about four hours east across the Pamban bridge, Palani around three hours north-west, and Kanyakumari roughly five hours south.

Trains are excellent

across the whole state, and a hired car with a driver is the standard way to do the Chola cluster, where the temples sit in villages between rice fields.

A twelve-day shape that works

Chennai, Kanchipuram, Mahabalipuram, Tiruvannamalai, Chidambaram, Gangaikondacholapuram, Darasuram, Thanjavur, Srirangam and Tiruchirappalli, Madurai, and out via Rameswaram or Kanyakumari.

A five-day shape

fly into Madurai, do the Meenakshi temple over two nights, drive up to Srirangam and Thanjavur, and fly out of Trichy. It is the best short introduction to south Indian temple architecture there is.

Add Kerala

if you have longer — Guruvayur and Padmanabhaswamy in Thiruvananthapuram are two of the most important Vishnu temples in the south, with strict dress codes and entry restricted to Hindus at both.

Come between November and February

Tamil Nadu from April to June is genuinely punishing — well over forty degrees, high humidity, and you will be walking barefoot on stone that has been in the sun all day. The north-east monsoon brings rain around October and November, which is a nuisance but not a barrier. December and January are close to perfect.

Plan around the midday closure

Most of these temples shut from around noon to four. An itinerary that ignores this wastes half of every day. Two temple sessions a day — early morning and evening — is the working pattern.

Learn the dress code before you arrive, because in the south it is real

At many Tamil temples, and strictly at the great Kerala ones such as Guruvayur and Padmanabhaswamy, men must remove their shirt and wear a dhoti or veshti to enter the inner areas, and women must wear a saree or a long skirt and blouse — trousers are not accepted at the strictest temples. Dhotis can be bought or hired outside every major temple. This surprises northern Indian visitors as much as foreign ones.

Know where entry is restricted

Guruvayur and Padmanabhaswamy admit Hindus only, and it is enforced. Most Tamil Nadu temples admit everyone, though the innermost sanctum may be restricted to Hindus or to those in traditional dress. Check at the entrance rather than at the sanctum.

Prepare your feet

You will be barefoot on stone for hours at a time, and by midday that stone is hot. Socks are permitted at many temples, and thick ones make a real difference. Walk barefoot at home for a couple of weeks beforehand if you can.

For Tirumala, set aside a full day

and understand that it is a queue system with hours of waiting, and that head-shaving is a common vow there. It is unlike any other temple visit on this trail.

For Tiruvannamalai, decide about the girivalam

Fourteen kilometres barefoot around a hill, ideally on a full moon night with a hundred thousand other people. It is one of the great experiences in south India. It also takes most of a night.

Hire a good guide at least once

, at Madurai or Thanjavur. The iconography of these temples is dense and specific, and an hour with someone who can read it changes how you see every temple afterwards.

Learn five words of Tamil

Vanakkam for hello, nandri for thank you. It is disproportionately well received.

Light cotton, and more of it than you think

It is hot and humid, and you will change daily.

For men: a dhoti or veshti

Buy one on arrival — they are sold outside every major temple, and someone will show you how to tie it. At the strictest temples you will need it, and at many others it is simply appropriate.

For women: a saree, or a long skirt and a blouse or kurta covering the shoulders

Trousers are not accepted at the strictest temples. A long dupatta or stole is endlessly useful.

Thick socks

The single most useful item on this trail. Barefoot on stone in the afternoon sun is painful, and socks are permitted at most Tamil temples.

Slip-on sandals

for everywhere else. You will take them off constantly and often leave them at a stand far from the sanctum.

A cloth bag, not leather

Belts and wallets too — leather is restricted at many sanctums.

A hat, sunglasses and high-factor sunscreen

Temple courtyards are vast, open and blinding at midday.

A small torch

The inner corridors of these temples are genuinely dark, lit by oil lamps, and a small torch helps you see the carvings without being intrusive.

A phone deposit plan

Several temples, including Tirumala and Padmanabhaswamy, do not permit phones or cameras and have counters at the entrance.

Water bottle and rehydration salts

You will lose more fluid than you notice.

Small notes

for offerings, shoe stands and archanai — the naming ritual in which a priest offers on your behalf.

Basic medical kit

and your own prescriptions, plus blister care for the girivalam if you walk it.

Leave behind

anything heavy, anything valuable, and leather.

Shoes off at the outer gate

, not at the sanctum — often a long way out, at a stand. Socks are usually permitted and you will want them.

Dress code is enforced, not suggested

Men bare-chested in a dhoti for inner areas at the strictest temples; women in saree or long skirt. If you are unsure, look at what is being worn by people going in, and ask at the entrance.

Go clockwise

around the sanctum and around the temple''s inner corridors, keeping the shrine on your right.

At Shiva temples, the parikrama is not completed in a full circle

— pilgrims turn back rather than cross the channel that drains the abhishekam water. Watch and follow.

Do not enter the innermost sanctum unless it is clear that visitors may

In many of these temples only priests go past a certain line, and at some, entry is restricted to Hindus. Darshan from outside is the normal experience for almost everyone.

Do not touch the deity, the priests, or the ritual vessels

Do not touch the carvings either; a thousand years of hands is what wears them away.

Photography is generally permitted in the outer courtyards and prohibited inside

, and at several temples phones must be deposited at the entrance. Never photograph the sanctum, a priest performing ritual, or a person having their head shaved.

Take theertham and prasad with your right hand

Theertham — blessed water — is poured into your cupped right palm; sip it and touch the rest to your head. Vibhuti, the sacred ash, is taken as a pinch and applied to the forehead. Kumkum likewise.

Archanai

is the common ritual: you give your name and star to the priest, who makes an offering on your behalf and returns prasad. It is a good way to take part, and offering something for it is customary.

Do not step on the threshold

of a shrine — step over it. And do not sit with your feet pointing at a sanctum.

Expect to be approached

by guides, priests and sellers, particularly at Madurai and Rameswaram. Decide what you want, agree it beforehand, and decline the rest pleasantly.

Be quiet and unhurried

These are places where people have been coming daily for a thousand years, and the tone is domestic rather than solemn — but a tourist voice carries a long way down a stone corridor.

Be at Madurai for the night ceremony

Around half past nine, after the last darshan, the priests carry Sundareswarar in a palanquin through the corridors to Meenakshi''s chamber, with drums and lamps and a small crowd following. It has happened nightly for centuries. Almost no tourists stay for it, and it is the best twenty minutes on this trail.

Plan around the midday closure or lose half your trip

It catches everyone.

Sort out the dress code before you are standing at a gate in trousers

Buy a veshti on your first morning in Madurai; someone at the shop will show you how to tie it, and it takes ten minutes.

Do not treat the Chola temples as a day trip

Thanjavur, Gangaikondacholapuram and Darasuram sit in villages an hour or two apart, in rice country, and they are the finest architecture in south India — an eleventh-century tower over sixty metres high, standing for a thousand years, still in worship. Give them two days and a car.

At Chidambaram, ask to be shown the Rahasya

Behind the curtain in the holiest chamber there is deliberately nothing — space itself as the form of Shiva. When the curtain is drawn and you are looking at empty air, it is one of the most startling ideas any religion has put into a building.

Srirangam is a city, so walk it like one

Do not go straight to the sanctum. Start at the outer gopuram and walk in through the seven enclosures, past houses and shops and schools, watching the streets get quieter and the walls get older. That progression is the design.

Do the girivalam at Tiruvannamalai if you have a night

Fourteen kilometres barefoot around a hill, ideally at full moon, in a slow river of people. It is the single most memorable night many travellers have in India.

Tirupati is not like the others

Set aside a whole day, expect hours in a managed queue, and understand that the intensity there is on a different scale — it is among the most visited religious sites on earth. The laddu prasadam is famous for good reason.

Eat on a banana leaf

Temple towns in Tamil Nadu do the best vegetarian food in India, and the meals served near these temples are part of the pilgrimage.

And go early, once

Five in the morning at Madurai or Srirangam, when the doors open and the lamps are lit and there are twenty people in a corridor built for two thousand. That is when you understand what these places are.