The rain backup plan: the budget line you settle with a calendar, not with luck
August 19, 2026 · Equipo OPHIRA
Nobody books a tent just in case. They book it once they already need it, which is late and expensive.
The rain backup plan lives in an odd corner of planning: everyone knows it exists, almost nobody budgets it, and the decision gets made staring at the week's forecast — when it's actually settled months earlier, choosing a date and a garden.
The good news is that both halves of the problem have a number. The government publishes the probability. Vendors publish the cost. With those two, the decision stops being a hunch.
If the budget still has no shape, the guide to where the money should go is the starting point. This piece stays on one line item almost nobody puts in the spreadsheet.
How many days it rains in Mexico City, month by month
The national weather service publishes the 1981–2010 climate normals: averages built from nearly three decades of records, station by station.
At the Tacubaya station, in Miguel Hidalgo, the SMN normals record 22 days with rain in July and 21 in August, against 1.5 days in December. The full year adds up to 120.2 days with rain.
Twenty-two against one and a half. That's the real difference between marrying in July and marrying in December, and it shows up in no budget conversation anywhere.
The same station reports 180.7 mm of rainfall in July and 169.2 in August, out of 835.2 mm a year. And one figure worth keeping in mind: its highest recorded daily rainfall is 80.5 mm, on an August 19.
Eighty millimeters in a day is what turns a garden into a mudfield. It isn't frequent — that's why it's a historical maximum and not an average — but it's the scenario a tent gets booked against.
Rain isn't the same across the city
Here's the figure almost nobody uses when choosing a venue, and it's the most useful of all.
The SMN normals don't describe "Mexico City": they describe specific stations. And the differences between them are enormous.
The El Guarda station, in Tlalpan, at 2,990 meters of altitude, records normal annual rainfall of 1,353.2 mm and 19.1 days with rain in July.
The Puente La Llave station, in Cuauhtémoc, records 294.9 mm a year and 93.5 days with rain annually.
One thousand three hundred fifty-three against two hundred ninety-five millimeters. Same city, same wedding month, and more than four times the rain in one area versus the other.
A garden in the high south of the city and a courtyard downtown are not facing the same risk, even if their photos look alike and so do their quotes — something our breakdown of rental prices by venue type breaks down by venue type.
It's worth saying precisely: these are individual stations, not whole boroughs. But if the venue you like sits in the high southern zone, the tent question stops being optional.
What a wedding tent costs in Mexico City
The second number is published too, though you have to go hunting for it in vendor price lists.
Banquetes AlFresco, in Mexico City, publishes a table where a 10 × 20 m tent with a maximum capacity of 180 people costs $11,110 MXN, installation included.
Event Planner México, also in Mexico City, puts that same white 10 × 20 m tent — for 180 to 250 people — at $22,000 MXN and up, and the 10 × 15 m one, for 120 to 180 people, at $16,500 MXN and up.
Two independent lists, the same dimensions, and a difference of nearly double. Neither is wrong: it's that "tent" covers everything from a bare structure to one with flooring, a ceiling liner and lighting.
Read it as a range, not a price: a tent for around 180 people in Mexico City moves between $11,110 MXN and $22,000 MXN, and what explains the gap is what's included. Asking for both quotes itemized is the only way to know which one you're comparing.
On why two quotes for the same thing rarely resemble each other, what to ask a wedding vendor before signing has the full list.
How to decide, with both numbers on the table
The arithmetic is short and you do it once:
- Locate your date on the rain calendar. July and August sit above 20 days with rain at Tacubaya; December is at 1.5.
- Locate your venue. The high south and the city center don't share a risk, and the gap between stations is more than fourfold.
- Ask whether the venue already has cover or a tent of its own. Many gardens include one or rent it cheaper than a third party would; that's the first question, not the last.
- If it doesn't, put the range in the budget today: between $11,110 MXN and $22,000 MXN for around 180 people, depending on what's included.
- Decide early. A tent booked with months of margin is a line item; booked the week of the wedding it's an emergency, and emergencies don't get quoted the same way.
None of this tells you whether to book it. It tells you what you're deciding against, which is different, and it's the only thing a piece of writing can honestly hand you.
When this line item isn't yours
If your wedding is under a roof from start to finish — a hall, a hotel, a house — this line doesn't exist for you and there's no need to put it in the spreadsheet.
It isn't yours either if your date falls in the dry season and your venue sits in a low-rainfall area: at 1.5 days of rain in December according to the Tacubaya station, the cost of insuring against that scenario far exceeds the risk.
The line worth opening today
Write down two things: the month of your wedding and the borough your venue is in. That alone tells you whether you're in the tent conversation or outside it.
If you're in it, ask for the quote now even if you don't book it. A number in the spreadsheet is worth more than a vague sense that "we'll have to look into it just in case", and it costs one phone call.
If you want that line living next to the rest of your budget instead of in a loose note, you can open your space in OPHIRA and log it as one more line item. It's free for the couple and asks for no card.