Highest temperature in Cape Town on July 13?

Platform comparison

Market context

On 13 July 2026, Cape Town International Airport will record its peak temperature for the day, a single data point that determines settlement for this weather contract. Today, Polymarket prices the YES outcome at 0%, reflecting near-total certainty that the temperature will not fall into the specific range implied by that binary option, while the market instead concentrates liquidity on discrete Celsius bands. The leading outcome is 17°C at 34% probability, closely trailed by 18°C at 33%, with 17°C currently holding the frontrunner status as odds shift continuously [1].

Historical July data frames these probabilities, as daily high temperatures in Cape Town typically hover around 63°F (17.2°C), rarely dipping below 57°F or exceeding 71°F [2]. The lowest daily average high for the month occurs precisely on 13 July at 62°F, aligning closely with the market’s 17°C consensus and explaining why extreme outliers like the all-time record of 45.2°C at Table Bay remain irrelevant to this specific airport station forecast [2][3]. Recent local readings support this median, with the highest temperature in the last fifteen days recorded at 67.9°F on 11 July 2026, just slightly above the expected average [4].

Traders should monitor real-time updates from Wunderground for the Cape Town International Airport Station (FACT), the designated resolution source, as the settlement window closes at 12:00 UTC on 13 July 2026 [1]. Since the market resolves on the highest temperature recorded for all times on this day, any sudden midday heat spike or cloud cover anomaly will instantly alter the conditional token distribution on Polygon [1]. With USDC liquidity already active across the 11°C to 18°C ranges, the primary catalyst is the official hourly log release, which will confirm whether the 17°C frontrunner holds or if the 18°C outcome captures the shift [1].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Cape Town on July 13? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

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.

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.

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.