Highest temperature in Buenos Aires on July 18?

Platform comparison

Market context

Buenos Aires will experience winter conditions on 18 July 2026, with the highest daily temperature at Ministro Pistarini International Airport (Ezeiza) the settlement metric. July is Buenos Aires's coldest month, with historical median highs around 13–14°C and occasional frost events. The 0% crowd probability suggests traders are either absent from this market or pricing an expectation that no extreme heat will occur during southern hemisphere winter.

Historical data from Wunderground shows July temperatures at Ezeiza rarely exceed 20°C; the station's records indicate highs typically cluster between 8°C and 16°C. Cold fronts from the south can drive temperatures below 5°C, whilst rare warm spells occasionally push readings into the low 20s. Comparable winter markets on Polymarket and Kalshi show similar low-probability clustering for austral winter extremes, though Kalshi's tighter KYC requirements and decimal-odds display sometimes attract different trader cohorts than Polymarket's broader US-focused user base. Betfair and Smarkets, with European liquidity dominance, historically show less depth on southern hemisphere weather contracts.

Traders should monitor long-range forecasts from Argentina's Servicio Meteorológico Nacional (SMN) in late June and early July. Any anomalous warming pattern or documented heat wave would shift probabilities sharply. The settlement window closes at 12:00 UTC on 18 July, giving traders until midday to react to morning temperature readings. Fee structures vary: Polymarket charges 2% on net winnings, whilst Kalshi takes 5% on both sides, potentially affecting position sizing on low-probability outcomes.

Methodology

This page compares Highest temperature in Buenos Aires on July 18? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. The live probability is the Polymarket mid; the comparison columns summarise each venue's fee structure, KYC, settlement currency and payment rails. Every CTA routes to Robinhood Prediction Markets, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

FAQ

What does Polymarket cost vs Kalshi?

Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.

Which platform has the deepest liquidity?

Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.

Is Betfair a Polymarket alternative?

Only partially. Betfair Exchange is UK-focused with a sports-betting emphasis; they have politics markets but with thinner liquidity than Polymarket. Settlement in GBP/EUR, 2-5% commission on winnings.

What about Smarkets as an alternative?

Smarkets is a UK betting exchange with a lower default commission (2%) than Betfair. Liquidity on political markets is below Polymarket, comparable to Kalshi. Geo-blocked in many jurisdictions.

Which platform is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Robinhood Prediction Markets has a different geo footprint and routes to Polymarket's order book at 0% fees.