Highest temperature in Buenos Aires on May 22?

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Market context

On Polymarket, this contract is effectively priced as a certainty of a very specific Buenos Aires temperature outcome, with the market showing 0% YES as of now. The event itself is straightforward: the highest temperature recorded at Minister Pistarini International Airport on 22 May 2026, expressed in Celsius, will be used to determine the settlement range once Wunderground finalises the daily history for SAEZ. Because the market settles from an on-chain USDC position on Polygon via conditional tokens, the practical question for holders is whether the day’s peak at the airport lands inside the chosen band, not whether Buenos Aires feels broadly warm or cool.

The historical backdrop points to a late-autumn pattern rather than anything extreme. May in Buenos Aires normally trends cooler through the month, with average highs falling from about 19°C at the start of May to roughly 16°C by month-end, alongside increasing cloud cover and lower solar energy. AccuWeather’s May guidance for Buenos Aires has recently put average highs around 60–65°F, which is broadly in line with upper-teens Celsius, while weather history sources for the area show midday readings often hovering in the low-to-mid teens or cooler at this time of year. For a YES outcome in a higher temperature band, a notable warm spell would usually be needed.

The main things to watch are the day’s local forecast around Ezeiza, the timing of any late-afternoon warming, and whether cloud, wind or drizzle cap the maximum before the airport’s daily observation closes. Wunderground’s SAEZ history page is the key settlement source, so traders will be focused on the final logged maximum rather than forecast models after the fact. With the market still at 0% YES, the implied view is that current weather expectations leave little room for a materially warmer-than-normal peak at Minister Pistarini.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Where can I trade this market with the lowest fees?

On PolyGram, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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 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 fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

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.