November
Go nowDry, green and mild, once the festival has passed
The rains have just ended, the hills are still green and the days are warm and clear. The first two days of the month are the Day of the Dead, with the build-up in the last days of October: the city is full, prices are at their highest and rooms are booked many months ahead. From the first week onwards it is the best month of the year.
January and February
Go nowClear, dry days and cold nights
Blue skies almost every day, warm afternoons and the fewest visitors of the dry season. Nights are cold and most rooms are unheated. The valley is brown rather than green, which suits the ruins.
October
Worth it, butThe last rains, and the build-up to the Day of the Dead
Showers thin out through the month and the countryside is at its greenest. The last week belongs to the festival: altars go up, the markets fill with marigolds, and prices rise day by day. Come early in the month for calm, or late and booked far ahead for the event.
December
Worth it, butDry and festive, and full at the end
Dry, sunny days and cold nights. The second half of the month is a run of celebrations — processions, and a night of carved radishes on the 23rd, a fixed date — and Mexican families travel from Christmas to the new year, so the city is busy and rooms cost more.
June to September
Worth it, butAfternoon rain, green valleys and the July festival
Mornings are usually clear and the rain arrives in the afternoon, heavily and briefly. The valleys are at their best and prices are low, except around the two Mondays after 16 July, when the Guelaguetza brings dancers from every region of the state and the city sells out.
March
Worth it, butDry, warm and turning dusty
The heat is building and the land is dry, but mornings and evenings are pleasant. Holy Week moves between March and April and fills the city with Mexican visitors for a week or more.
April and May
Think twiceThe hottest and haziest weeks, before the rain
The hottest part of the year, before the rains break: afternoons are hard work, the valley is brown and the air is hazy with dust. May is also when the annual teachers' protest usually begins, with a camp in the main square and road blockades. Nothing is closed, but it is the least rewarding time to come.