September is our favorite balance on the Inca Trail. It is still the dry season, nights are a little milder than in July, and the summer holiday crowds have gone home. It is also the last dry month: in October, average rain at Machu Picchu more than doubles. Peru has no national holidays in September, and for US travelers Labor Day falls on Monday 6 September 2027. Book before the 2027 permits go on sale, expected October–November 2026, or at least five to six months ahead.
- 76 mmaverage September rain at Machu Picchu; October jumps to 163 mm.
- 0national holidays in Peru in September.
- 13–14 Septhe Señor de Huanca pilgrimage, one of Cusco’s great festivals.
Weather on the Inca Trail in September
These are the official climate normals of Peru’s weather service, SENAMHI, for its Machu Picchu station (2,399 m / 7,871 ft), near the end of the trail. September is the warmest month in the table and still dry; the real change comes in October:
| Month | Rain | Average high / low |
|---|---|---|
| July | 54 mm (2.1 in) | 22.1 / 9.4 °C (72 / 49 °F) |
| August | 61 mm (2.4 in) | 23.1 / 10.0 °C (74 / 50 °F) |
| September | 76 mm (3.0 in) | 23.4 / 11.1 °C (74 / 52 °F) |
| October | 163 mm (6.4 in) | 22.8 / 11.5 °C (73 / 53 °F) |
Source: SENAMHI, climate normals 1991–2020, Machu Picchu station. The high sections of the trail are much colder.
In practice, September mornings are usually clear and the afternoons bring more clouds than in July, with an occasional shower, more likely late in the month. Nights are less harsh than in midwinter, but the high camps are still cold: at Pacaymayo (3,600 m / 11,810 ft) a clear night can still drop to around freezing, and Dead Woman’s Pass (4,215 m / 13,828 ft) is never warm. On 23 September, the equinox, spring begins in the southern hemisphere, and the cloud forest on days 3 and 4 starts to turn greener.
Crowds: why September feels calmer
The daily cap on the Classic route does not change, 500 people including guides, cooks and porters. What changes is the pressure around it:
- Summer holidays are over in North America and Europe, and schools are back.
- No Peruvian national holidays: after Santa Rosa de Lima on 30 August, the next one is the Battle of Angamos on Friday 8 October 2027. Fewer domestic travelers on the trains and in Aguas Calientes.
- Machu Picchu is still in high season: in 2026 the higher daily capacity of 5,600 visitors applied from 19 June to 2 November (RM 285-2025-MC); the 2027 dates are still to be published.
“Calmer” is relative: September is still one of the most requested months for the trail, because the weather is so good. If your dates are fixed, reserve early; if the Classic route is full, the 2-day Inca Trail has its own quota of 250 people a day.
What’s happening in September 2027
- Monday 6 September, Labor Day (US): a trip from Saturday 28 August to Monday 6 September uses only 5 vacation days. See our guide to planning the Inca Trail from the USA.
- Monday 13 and Tuesday 14 September, Señor de Huanca: on the night of the 13th, thousands of pilgrims walk from San Jerónimo, on the edge of Cusco, over the slopes of Apu Pachatusan to the sanctuary of Señor de Huanca in San Salvador (Calca), and the festival is held on the 14th. It was declared Cultural Heritage of the Nation in 2014. It is a religious pilgrimage, not a show: if you go, go with respect.
- Thursday 23 September, equinox: the start of spring in the southern hemisphere.
September, August or October?
- August: a little drier and windier, with colder nights and more people.
- September: still dry, slightly milder nights, fewer people. The best balance if you can choose.
- October: shoulder season, with more choice of dates, but rain more than doubles and showers become part of the trek, especially late in the month.
The dry months are also the wildfire season in the Andes. Closures are rare and short and are decided by the authorities; in October 2023, for example, route 1 was closed for three days after a fire and groups were moved to route 5. We explain what that means for your trek in our August guide. Rain can close the trail too: in 2026, routes 1–3 were closed from 19 August and reopened on 5 September after unusual August rains.
What to pack for September
- A warm sleeping bag: a comfort rating of about −10 °C (14 °F) from May to September, or rent one from us.
- A real rain jacket: showers are more likely than in July and August.
- Layers: a fleece, a down or synthetic jacket, hat and gloves for the camps and the pass, and light clothes for the warm cloud forest.
- Sunscreen, SPF lip balm and sunglasses.
- The full list: our Inca Trail packing list, with a printable checklist.
Is September the right month for you?
September is right if you want dry-season weather without the peak-summer crowds, or if you are planning around Labor Day. It is also a good month to combine the trek with the Señor de Huanca festival. Compare it with every other month in our month-by-month guide, and get ready with our 12-week training plan. Booking now has a bonus: Classic Inca Trail departures in 2027 keep the 2026 price of US$795 if you book by 31 December 2026 (see how to book). Check September 2027 in the calendar below.
Frequently asked questions
Is September a good time to hike the Inca Trail?
Does it rain on the Inca Trail in September?
Is the Inca Trail crowded in September?
What festivals are there in September near Cusco?
When should I book the Inca Trail for September 2027?
About the author
Raquel Sánchez co-founded Terra Quechua Peru in Cusco in 2012 together with Edwin Medina, both with extensive trekking experience. She writes our Inca Trail guides from the day-to-day work of securing permits and organizing every departure with our guides, cooks and porters.