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 determine the settlement outcome for this market. The airport's weather station, located in Ezeiza roughly 35 kilometres south-west of the city centre, serves as the official measurement point. The crowd-implied probability of 0% suggests traders are pricing in either extremely low confidence in any particular temperature band or technical issues with market liquidity rather than meteorological certainty.

Buenos Aires experiences mid-winter conditions in July, with historical daily highs typically ranging between 12°C and 16°C at the airport station. The coldest July on record saw daily maxima drop to single digits, whilst unusually mild winters have produced highs near 20°C. The 0% probability across all temperature ranges is anomalous and likely reflects minimal trading activity rather than genuine consensus; comparable weather markets on Kalshi and Polymarket for Southern Hemisphere winter dates generally show distributed probabilities across 3–5 temperature bands. Cross-platform comparison reveals no published sportsbook lines for this specific outcome, as weather derivatives remain concentrated in prediction markets rather than traditional betting venues.

Traders should monitor the Southern Oscillation Index and sea-surface temperatures in the South Atlantic through June 2026, as these drive winter weather patterns across Argentina. Any significant atmospheric blocking systems or cold fronts tracking from the south could shift outcomes materially. The settlement window closes at midday UTC on 18 July, allowing only morning Buenos Aires time for final price adjustments once local forecasts firm.

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 PolyGram. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like PolyGram 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.