Highest temperature in Paris on May 22?

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Market context

Paris is set for a warm, mostly dry day, but the settlement measure depends on the single highest reading at Paris-Le Bourget Airport by noon UTC. The current public forecasts point to a modest spring maximum rather than an extreme spike: Weather2Travel and Weather25 both put Paris in the high teens Celsius for May, while AccuWeather’s monthly outlook shows mid-to-high teens on many days. A forecast round-up from Sortiraparis for 22 May described partly cloudy, drier conditions, with temperatures around 15°C in the city. That leaves little obvious support for a very hot outcome before midday, which helps explain why the market is currently leaning away from the upper temperature bands.

For comparison, Paris in May usually sits around 18°C by day, with rain on a fair number of days and occasional short-lived warm spells. The key historical lesson is that late-spring warmth in Paris tends to be local and brief rather than persistent, so the highest reading often depends on whether a morning burst of sun develops at the airport site. In markets like this, the difference between a mild forecast and the actual observed maximum can come down to a few degrees if cloud cover breaks earlier than expected. With the crowd at 0% for the top-end outcome, the implied view is that any heat will be too limited or too late to matter for the noon UTC settlement window.

The main catalyst is the day-of weather evolution at Paris-Le Bourget: cloud cover, wind direction, and whether temperatures rise quickly enough before the market closes. Traders should watch the latest nowcasts from weather services and any updated short-range forecast from Meteo-France or local media, especially if the morning clears faster than expected. The most relevant dependency is not a scheduled event but the timing of sunshine and air mass warming; a delayed clear-up would cap the maximum, while a faster break in cloud could nudge the reading up by a few degrees before noon.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Political prediction markets differ structurally from sports betting: thinner liquidity, longer settlement windows, higher sensitivity to single news events. This page shows the live Polymarket quote for Highest temperature in Paris on May 22? plus platform attributes for the three reference venues, so you can see at a glance where the deepest market for this question sits.

Resolution & payout

For political markets the resolution source is decisive. Polymarket defines a concrete source per contract (e.g. AP, Reuters, official electoral commission) and uses the UMA Optimistic Oracle as the on-chain dispute mechanism. With a clearly defined outcome the USDC payout lands within minutes of the final confirmation.

FAQ

Is this market available outside the US?

PolyGram is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

What does it cost to trade on PolyGram?

Zero. PolyGram routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.