Highest temperature in Cape Town on July 13?

Platform comparison

Market context

Cape Town International Airport is experiencing its coldest month, with July historically delivering average highs near 17°C and lows around 7°C. The current crowd-implied probability of 0% for any specific temperature range aligns with the region’s Mediterranean winter climate, where temperatures rarely exceed 20°C. Historical data confirms July is the coldest month, with average highs of 63°F (17°C) and lows of 46°F (8°C), making extreme heat events virtually non-existent at this station [1].

Comparable cases from recent July records show maximum temperatures consistently falling between 12°C and 19°C, with no documented instances of the airport reaching 25°C or higher during this period. This thermal ceiling explains the market’s zero probability assignment, as the settlement source—Wunderground’s daily high for Cape Town International Airport—will almost certainly reflect these typical winter bounds [2][3]. Traders should monitor the 3-hourly forecast updates for fog or high fog, which often suppress daytime heating further, and watch for any unseasonal southerly wind shifts that could temporarily elevate temperatures, though such deviations remain statistically negligible [2][3].

No recent announcements or weather alerts suggest a catalyst for anomalous heat, and the absence of extreme weather warnings in current forecasts reinforces the 0% implied probability. The divergence between sportsbook lines (which typically avoid such low-probability weather contracts) and prediction-market pricing highlights the market’s efficiency in pricing in seasonal certainty. Analyst consensus on similar winter-temperature contracts consistently treats July in Cape Town as a low-variance, cold period, further validating the current pricing structure [4][6].

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

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.

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.

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.

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.