Highest temperature in Buenos Aires on July 18?

Platform comparison

Market context

On 18 July 2026, the highest temperature recorded at Minister Pistarini International Airport in Buenos Aires will fall into one of several defined ranges. The airport's weather station provides the official measurement source, accessible via Weather Underground's historical data interface. Traders will need to cross-reference the Celsius scale setting to ensure accurate settlement, as the platform defaults to Fahrenheit in some regions.

July represents mid-winter in Buenos Aires, with historical daily highs typically ranging between 13–16°C at the airport station. The 0% crowd probability suggests the market may be pricing in an unusually cold outcome or reflects low participation volume rather than genuine conviction about temperature extremes. Comparable July days from the past decade show occasional peaks near 20°C during anticyclonic systems, though sustained warmth remains uncommon. The airport's coastal proximity to the Río de la Plata moderates temperature swings compared to inland Buenos Aires readings.

Traders monitoring this market should track Southern Hemisphere winter weather patterns, particularly ridge-building high-pressure systems that occasionally push northward from Patagonia. The Servicio Meteorológico Nacional Argentina publishes forecasts 10 days in advance; significant deviations from seasonal norms typically emerge 5–7 days before the settlement date. Programmatic approaches would benefit from automated pulls of Weather Underground's historical API, allowing conditional orders triggered by forecast updates from regional meteorological services.

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Polymarket Bot UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Polymarket Bot UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

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.