Highest temperature in Cape Town on July 27?

Platform comparison

Market context

Polymarket is pricing the day’s Cape Town temperature contract with **17°C** leading at **24%** and **18°C** close behind at **20%**, while the crowd has put **0%** on the top-line **YES** outcome as framed here. On Polymarket, traders are buying and selling **USDC**-denominated conditional tokens on **Polygon**, so the market price is the live consensus on which temperature band will contain the highest reading at Cape Town International Airport, not a forecast of Cape Town weather in general.[2]

For context, Cape Town’s July climate is cool by southern African standards: average highs are about **18.9°C** and lows about **6.6°C**, which makes the market’s centre of gravity around the high teens look consistent with seasonal norms.[1] That said, the settlement source is a single station reading at Cape Town International Airport, so small shifts in cloud cover, coastal onshore flow, or a short inland warming spell can move the daily maximum by a degree or two; in a banded market like this, that is often enough to change the winning contract.[1][2]

A trader watching the close should focus on the actual **Wunderground history** page for the airport station, because the market resolves to the highest temperature recorded on the day, not the forecast at any one hour.[2] The main dependencies are the station’s reported maximum, the timing of the daily warm-up, and whether the eventual reading lands in the neighbouring band above or below the market’s current favourite; with resolution due by **12:00 UTC**, position changes matter most if late-morning temperatures drift away from the 17°C to 18°C cluster.[2]

Sources: 1 · 2

Methodology

We track Highest temperature in Cape Town on July 27? 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 Polymarket Scam?. 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.

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.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

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.