The destination
Weather and harvest,
month by month
Average highs and lows for Mendoza in Celsius and Fahrenheit, with what each month actually does to a wedding: rain, hail, wind, light and how hard the date is to get.
Mendoza is a semi-arid high desert: a great deal of sun, low humidity, very little rain, and a daily temperature range that behaves like the desert it is. The wedding season runs October to April, November is the most contested month, and the harvest falls between February and April. Summer afternoons reach around 32 °C (90 °F) in January and winter nights fall to about 3 °C (37 °F) in July.
Three things decide whether that climate works for your date, and none of them is the daytime temperature: the rain window (December to March, in short late-afternoon storms), the Zonda wind (August to November), and the drop between afternoon and midnight, which in Valle de Uco can be close to twenty degrees Celsius. The table below gives all twelve months with what each one means operationally.
Reviewed · Temperature figures from the Servicio Meteorológico Nacional (Argentina)
The year in summary
The dates and thresholds that come up in every planning conversation, in one place.
| Climate | Semi-arid high desert: strong sun, low humidity, wide daily temperature range |
|---|---|
| Wedding high season | October to April |
| Most contested month | November |
| Harvest (vendimia) | February to April — March and April at altitude |
| Rain | Concentrated December to March, as short late-afternoon convective storms |
| Driest month | July |
| Zonda wind season | August to November |
| Hail risk | December to March |
| Sunset in December | Around 20:30 |
| Valle de Uco vs the city | Typically 3–5 °C (5–9 °F) colder, with a wider swing |
| A summer day, end to end | A 32 °C (90 °F) afternoon becomes a 14–16 °C (57–61 °F) night. The drop starts around 22:00 |
| Gualtallary altitude | 1,100 to 1,500 m — cold nights all year |
Temperatures: reference monthly averages for the city of Mendoza, Servicio Meteorológico Nacional (Argentina), rounded to the whole degree. Fahrenheit values converted and rounded to the whole degree. Season, harvest window, Zonda and hail periods: provincial viticultural and meteorological practice as applied by the local wedding market. Last editorial review: 2026-08-01.
The table
Mendoza month by month, read for a wedding
Average high and low for the city of Mendoza, and what the month does to an event: weather risk, light, vineyard state and how hard the date is to secure. Highlighted months are the October-to-April high season.
| Month | Average high | Average low | What it means for a wedding |
|---|---|---|---|
| January | 32 °C (90 °F) | 18 °C (64 °F) | Peak summer and the wettest month of a dry year: short, heavy late-afternoon storms, and the highest hail risk. Long daylight. High demand, and it coincides with the South American holiday period. |
| February | 31 °C (88 °F) | 17 °C (63 °F) | Harvest begins in the lower vineyards. Storm risk still present. Double demand — weddings plus wine tourism — so dates and hotel rooms compete. |
| March | 28 °C (82 °F) | 15 °C (59 °F) | Full harvest, with the leaves starting to turn. The most photographed weeks of the year: warm afternoons, cooler nights, falling storm risk. Books out early. |
| April | 24 °C (75 °F) | 11 °C (52 °F) | High-altitude harvest, gold and red foliage, little rain. Nights already cold enough that the second half of the party wants a heated or enclosed space. More date availability than March. |
| May | 19 °C (66 °F) | 7 °C (45 °F) | Autumn colour with almost no competition for dates. Outdoor ceremonies only in the middle of the day; the reception moves indoors. The range starts to take snow. |
| June | 16 °C (61 °F) | 4 °C (39 °F) | Dormant vines, fully snow-covered Andes, very dry. An indoor winter wedding by design — barrel room, fireplace, long table — or not at all. |
| July | 16 °C (61 °F) | 3 °C (37 °F) | The driest month of the year and the coldest nights. Pruning season in the vineyard. Minimal wedding activity; every date is open. |
| August | 19 °C (66 °F) | 5 °C (41 °F) | Zonda season opens. Warm, very dry wind off the cordillera that can make an outdoor event unworkable for a few hours. Low demand. |
| September | 22 °C (72 °F) | 8 °C (46 °F) | Budbreak against still-snowy peaks — the strongest visual contrast of the year. Zonda risk continues. A niche month, and dates are available. |
| October | 25 °C (77 °F) | 11 °C (52 °F) | The season opens. New, light-green vineyard, mild afternoons, moderate rain, snow still on the range. Zonda still possible. |
| November | 28 °C (82 °F) | 14 °C (57 °F) | The most contested month in the market: full green vineyard, flowering, long evenings and lower storm risk than midsummer. Expect to book 12–18 months out. |
| December | 31 °C (88 °F) | 17 °C (63 °F) | The longest days of the year, with sunset around 20:30 — a 19:00 ceremony still gets an hour of low light. Storms and hail return. High demand. |
Highs and lows are reference monthly averages for the city of Mendoza, published by the Servicio Meteorológico Nacional (Argentina) and rounded to the whole degree; Fahrenheit converted from those rounded Celsius values. Valle de Uco runs 3 to 5 °C (5 to 9 °F) colder than these figures, with a wider daily swing. Averages describe a normal month, not a specific date. Last editorial review: 2026-08-01.
We publish averages rather than records because a wedding is planned against what a month usually does. For the day itself, the only useful instrument is a contracted covered alternative — not a forecast.
The three risks most guides leave out
1. The temperature drop
This is the most underestimated variable and the easiest to solve. Gualtallary sits between 1,100 and 1,500 metres, and Valle de Uco runs 3 to 5 °C (5 to 9 °F) colder than the city. A 32 °C (90 °F) afternoon can end as a 14–16 °C (57–61 °F) night, and the descent starts around 22:00 — which is the middle of the party, not the end of it.
Guests arrive dressed for the photograph they were shown and are cold by midnight. Wraps at the entrance, outdoor heating, or moving the second half of the night into a covered space are the standard answers. All three are cheap. None of them can be arranged on the night.
2. The Zonda
The Zonda is a foehn wind: air that has dumped its moisture climbing the Chilean side of the Andes descends the Argentine slope compressed, warm, very dry and full of dust. It is most frequent from the end of winter through spring, August to November — which overlaps the start of high season. When it blows, an outdoor event can become unworkable for a few hours.
There is no forecasting it months in advance. What can be arranged in advance is the alternative: a covered space of the same capacity, decidable the day before, named in the venue proposal rather than assumed. That single clause is what separates a manageable afternoon from an improvised one.
3. Summer hail
Between December and March, late-afternoon convection can produce short, violent storms with hail, including in Valle de Uco. It is the reason growers here invest in anti-hail netting across the vineyards. For a wedding, it means a December-to-March contingency plan has to be structural — a real roof for the whole group — rather than a gesture.
Light, and the shape of the evening
In December the sun sets around 20:30. That is what makes a 19:00 ceremony work: an hour of low, warm light for the vows and the first part of the cocktail before anyone sits down to dinner. In the shoulder months the same clock time is already dusk, and in winter it is full night — so the ceremony moves earlier in the day, or indoors.
This is the practical reason the season and the running order have to be settled together. A timeline copied from a wedding at home, in a different latitude and a different month, tends to put the ceremony either into the flat light of the afternoon or into darkness.
Harvest: February to April
The vendimia is the province's working season and its largest celebration. Picking starts in the lower, warmer vineyards around February and finishes at altitude — Gualtallary and the rest of high Valle de Uco — usually between March and April. The vineyard is loaded, the winery is in full operation, and the landscape moves from green to gold.
Marrying inside that window means the wedding joins something already happening, which is exactly why it photographs the way it does. It also has two costs worth knowing up front: February and March compete with November for every good date in the market, and the winery is at its busiest, which reduces flexibility on timings and on which spaces are free. Both are early conversations, not late ones. What a winery should be able to answer on that point is set out in venues.
How to use this table to choose a date
Decide the landscape first and the date second. The three options are genuinely different weddings: green vineyard (October to December), harvest gold (February to April) and snow-covered cordillera with bare vines (June to August). The season sets the entire aesthetic of the wedding; the exact Saturday inside it is negotiable, and often the only thing that is.
Then apply three filters in order. Weather risk: if you want an outdoor reception with no structural backup, April, May and October are kinder months than January. Light: if the ceremony has to be at sunset, November to January gives you the latest one. Availability: a high-season date is booked 12 to 18 months ahead, and the binding constraint is usually not the venue but hotel rooms for the group and long-haul tickets.
Once the month is chosen, the rest of the planning becomes a sequence: budget, legal route, guest logistics. The cost side is on what a wedding in Mendoza costs, the paperwork on legal requirements, and the regions themselves, with drive times and altitudes, on Mendoza region by region. How a three or four day programme is built around the date is covered on the wedding weekend.
Questions about the weather
When does it rain in Mendoza?
Rarely, and almost all of it between December and March, as short convective storms in the late afternoon rather than steady rain. Winter is close to dry, and July is the driest month of the year. That does not remove the need for a covered plan: summer rain here is uncommon, but when it comes it is heavy, brief, and it arrives at precisely the hour a ceremony is scheduled.
How cold does it get at night, even in summer?
Colder than the daytime figures suggest, and this is the most common mistake couples make planning from abroad. Gualtallary sits between 1,100 and 1,500 m, and Valle de Uco runs 3 to 5 °C (5 to 9 °F) below the city. A 32 °C (90 °F) January afternoon can end as a 14–16 °C (57–61 °F) night, with the drop starting around 22:00 — mid-party. Pashminas, outdoor heating, or moving the second half of the night into a covered space are basic operations here, not luxuries.
What is the Zonda?
A foehn wind: air that has dropped its moisture crossing the Andes and comes down the eastern slope warm, extremely dry and carrying dust. It is most frequent from August to November. When it blows, it can make an outdoor event unworkable for several hours. It cannot be forecast months ahead, so the answer is contractual rather than meteorological: a covered alternative of the same capacity, decidable the day before, written into the venue proposal.
Is hail a real risk?
Yes, between December and March, including in Valle de Uco. Late-afternoon convection can produce short, violent storms — it is the reason the region invests in anti-hail netting over the vineyards. For a wedding it means the December-to-March contingency plan has to be structural, with a real covered space, rather than improvised with umbrellas.
When is the harvest, and is it a good time to marry?
The vendimia runs February to April, varying by grape variety and altitude: lower vineyards pick first, high-altitude sites such as Gualtallary usually between March and April. Marrying during harvest puts the wedding inside something the region is genuinely doing — working vineyards, gold foliage, the whole province in motion. The trade-offs are that dates are contested and the winery is at its busiest, which narrows flexibility on timings and spaces. Raise it early with the venue, not near the date.
Which month is the most requested?
November. The season runs October to April, and November concentrates the most demand because it combines a green vineyard, mild afternoons, long daylight and a lower storm probability than midsummer. March is the second peak, for harvest. If the priority is the photograph, those two compete; if the priority is availability, April and May offer close to the same conditions with far less competition for a Saturday.
From a month to a date
Checking what is still open in your season
Huentala Weddings operates at 1,100–1,500 m in Gualtallary, with a covered alternative for every outdoor space — which in this climate is the question worth asking first. If you want availability for a specific month and a written proposal, that is where the conversation happens, in English, Spanish or Portuguese.
Enquiries answered personally, usually within one business day.