Oaxaca in September: Weather, Rain Days, Crowds and Site Hours

OAXACA · MEXICO · SEPTEMBER

Oaxaca in September brings warm afternoons, cool mornings and rain on most days. The city sits just under a mile above sea level, in a valley ringed by mountains, and the mornings feel it. The market stalls, the mezcal country and the ruins on the hills are all still on the table.

Bring a light rain jacket and September works well for anyone who likes markets, museums and archaeology. If you are still deciding where to spend the month, our month-by-month destination picks line up the alternatives.

On this page

• Oaxaca weather in SeptemberHighs of 84.4°F, lows of 61.0°F, rain on 21.4 days
• How warm is Oaxaca in September?Afternoon and dawn temperatures, and what to wear
• Oaxaca crowds and prices in SeptemberBooking, lodging tax and where extra money helps
• Things to do in Oaxaca in SeptemberMonte Albán, Mitla, Yagul, Hierve el Agua and Tlacolula
• Oaxaca itinerary for SeptemberTwo days built around the valley sites and the rain
• Oaxaca in September vs August and OctoberRain of 6.44 inches against 5.19 and 2.48
• Is September a good time to visit Oaxaca?Who should go, and who should wait for October

The U.S. State Department’s Mexico travel advisory, issued May 29, 2026, rates the state of Oaxaca at Level 2, Exercise Increased Caution, the same baseline level as most of the country. Read the current version before you book, and see our travel basics for general trip preparation.

Oaxaca weather in September: average highs, lows and rain days

Every figure here comes from Mexico’s national weather service, the Servicio Meteorológico Nacional (CONAGUA), and its 1991-2020 normals for its own Oaxaca station, number 20079, in Oaxaca de Juárez at 1,594 meters. September averages a high of 84.4°F, a low of 61.0°F and 6.44 inches of precipitation. That is a thermometer on the valley floor, so villages higher in the Sierra will run cooler.

The SMN counts 21.4 days of measurable rain in an average September, about seven days in ten. Its sheet publishes no threshold for what counts as measurable, and we found no hourly breakdown, so we cannot say whether the rain lands at noon or at midnight. Treat a wet day as the default: a light rain jacket in the daypack, closed shoes, and an indoor fallback for each outdoor plan.

The average afternoon and the average dawn sit 23.4 degrees apart. Short sleeves cover the middle of the day. Add a light layer for early starts and evenings, and let the rain jacket double as a windbreaker.

Daylight on September 15 runs about 12 hours 16 minutes, with sunrise at 6:14 a.m. and sunset at 6:29 p.m. in Mexico City time, which Oaxaca keeps. Monte Albán closes at 5 p.m., about an hour and a half before dusk, so a late visit still ends in daylight.

How warm is Oaxaca in September?

A September day in the city averages 84.4°F at its warmest and 61.0°F at its coolest, from the station on the valley floor. Oaxaca is inland, so there is no sea temperature to quote. The Pacific coast is a separate trip, and we hold no verified coastal data.

Light cotton and a hat handle the afternoon. A sweater or overshirt earns its place on early starts, such as the 8 a.m. opening at the ruins. Sunscreen still matters at this altitude, rain or not.

We found no count of frost nights in the normals we read. An average low of 61.0°F sits far above freezing, but an average hides individual nights, and we hold no numbers at all for the higher Sierra villages.

How busy is Oaxaca in September? Crowds and prices

We found no occupancy series and no monthly hotel-rate data for Oaxaca, so we rank no month by price. The weather data does place September in the wet stretch: 6.44 inches of rain, against 5.19 in August and 2.48 in October.

We could not verify a booking lead time for September, so we give no number of weeks. Look for free cancellation on the room, since a month with this many rain days is one where plans move.

We could not verify Oaxaca’s lodging-tax rate, so we give no percentage. Ask each hotel whether the quoted rate includes tax before you compare two of them.

Transport between the valley sites is where extra money changes a rainy month. A private driver or a guided day across the eastern valley, around Tlacolula, Yagul and Mitla, keeps you moving between showers. It is our editorial judgment, and we hold no prices for either.

Things to do in Oaxaca in September

We verified no dated September festival, so we name none. Nothing we read shows a September closure either: the valley’s ruins list daily hours, the museum runs Tuesday to Sunday, and the Sunday market keeps its weekly slot.

Monte Albán crowns the Cerro del Jaguar above the valley and holds UNESCO World Heritage status, granted in 1987. Mitla and Yagul sit in the valley near Tlacolula, with Yagul just past the town on the Panamerican Highway. All three charge 210 pesos at the general rate and 105 pesos for Mexican nationals and foreign residents. All three open daily from 8 a.m. to 5 p.m., with last entry at 4 p.m. at Monte Albán and Yagul and 4:30 p.m. at Mitla.

Hierve el Agua’s petrified waterfalls and mineral pools lie east of the city near San Lorenzo Albarradas. The local community manages them and collects its own entrance fee on site, and we could not verify the amount or a water-temperature reading. In a month of frequent rain, the Museo de las Culturas de Oaxaca, in the former Santo Domingo convent, is the indoor fallback: 210 pesos general, 105 for nationals and residents, Tuesday to Sunday, 9 a.m. to 5 p.m.

We hold no verified free-admission list, but the Zocalo asks nothing to sit in, shaded by laurel trees and framed by the cathedral and the state government palace. Tlacolula’s Sunday market of local food and crafts sits in the valley near Mitla and Yagul. Teotitlán del Valle, on the road to Mitla, is known for hand-woven, hand-dyed wool rugs, and small mezcal palenques around the valley open their stills to visitors. We hold no tasting fee or rug price.

Oaxaca itinerary for September

Day one, Monte Albán and Santo Domingo. Be at the Monte Albán gate at 8 a.m. and walk the ridge in the cool part of the day, then head back down for a long lunch in the city. The Museo de las Culturas opens at 9 a.m. and closes at 5 p.m., so a mid-afternoon visit fits, and it doubles as cover if the sky turns. Avoid Monday, when it is closed. End at the Zocalo before sunset at 6:29 p.m.

Day two, the eastern valley, ideally on a Sunday. Start at Tlacolula’s market, then go on to Yagul just past the town (last entry 4 p.m.) and Mitla (last entry 4:30 p.m.). Stop at Teotitlán del Valle’s rug workshops or a mezcal palenque on the way back. If rain sets in, drop Yagul and keep the indoor stops. Since we cannot say when in the day the rain falls, keep the afternoon flexible.

Oaxaca in September vs August and October

All three months come from the same SMN station and the same 1991-2020 period. Highs barely move: 86.0°F in August, 84.4°F in September, 84.7°F in October. Rain moves a lot. September is the wettest of the three at 6.44 inches, against 5.19 and 2.48, and rain days fall from 21.4 in September to 12.0 in October.

Shifting four weeks toward October gives you 9.4 fewer rain days and 3.96 inches less rain, with afternoons that stay near 84.7°F. The cost is cooler dawns, down 2.9 degrees to 58.1°F on average. Shifting toward August buys a slightly warmer 86.0°F afternoon but no relief from rain, and we hold no price data to say what either move does to a hotel bill.

Is September a good time to visit Oaxaca?

Yes for travelers built around museums, markets, mezcal stops and a ruin or two, who can shuffle days around the weather. No for anyone whose plan is a dry all-day walk in the open with no fallback.

If the answer is no, choose October: 12.0 rain days instead of 21.4, and 2.48 inches instead of 6.44. Compare more destinations for that month in our when-to-go guides.

Among the three months, September has the mildest dawn, an average 61.0°F, which suits an 8 a.m. start at Monte Albán. With no verified September events on our list, that early-morning ease is the month’s clearest gift.

The last word

Oaxaca in September rewards an early start and a loose afternoon. Be at Monte Albán when the gates open at 8 a.m., on the hill where a Zapotec capital stood for some 1,500 years, and keep the Santo Domingo museum in your pocket for whichever hour the sky closes in.

Sources & data for this guide

• September temperature, precipitation and rain days, 1991-2020 normals · Servicio Meteorológico Nacional (CONAGUA), station 20079, Oaxaca de Juárez · checked Sep 29, 2026
• August and October normals · same station and period · checked Sep 29, 2026
• Daylight, sunrise and sunset on Sept 15 · sunrise-sunset.org, converted to Mexico City time · checked Sep 29, 2026
• Fees and hours for Monte Albán, Mitla, Yagul and the Museo de las Culturas de Oaxaca · INAH · checked Sep 29, 2026
• Monte Albán’s UNESCO listing and history · INAH, Lugares INAH · checked Sep 29, 2026
• Travel advisory for the state of Oaxaca · U.S. Department of State, issued May 29, 2026 · checked Sep 29, 2026
• Descriptions of Hierve el Agua, Tlacolula, Teotitlán del Valle, the mezcal palenques and the Zocalo are editorial. We found no occupancy series, hotel rates, lodging-tax rate, frost count, Hierve el Agua fee or dated September events. Hours and fees change · check operators when you book.