Highest temperature in Cape Town on July 27?

Platform comparison

Market context

Cape Town International Airport’s peak temperature is being priced as a cool winter reading, with the market’s current leading bucket around **17°C** and the next closest at **18°C**, while the contract itself shows **0%** implied for a **YES** on the narrowest framing of the outcome. That gap suggests traders are concentrating liquidity in the mid-to-high teens rather than expecting a genuine warm spell, which is consistent with Cape Town’s July climate profile: average highs are about **18.9°C** and average lows about **6.6°C**.[1][2]

For context, this is a high-variance daily-weather contract rather than a seasonal temperature average. At a major coastal airport, the day’s maximum can be pulled lower by cloud cover, marine air, or passing fronts, and even one or two degrees materially shifts which settlement band wins. The comparison point across platforms is therefore less about a single “fair” number and more about whether sportsbook-style lines, market pricing, and analyst-style weather expectations are all clustering around the same band; here, the observed crowd pricing is already centred below the July mean, implying a mild downside bias versus climatology.[1][2]

The main catalyst is the actual weather pattern over the Cape Peninsula during the settlement window, especially any frontal system, onshore flow, or post-frontal clearing that could keep the airport’s high pinned in the mid-teens or allow a brief rebound towards 18°C or above. Because resolution uses the Cape Town International Airport Station and the day’s highest recorded temperature on Wunderground, traders should watch the local forecast cycle and any short-term model updates rather than city-wide averages, as coastal and inland temperatures can diverge sharply on the same day.[1][2]

Sources: 1 · 2

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Best Prediction Markets, which mirrors the Polymarket order book directly.

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

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.