Highest temperature in Cape Town on August 3?

Platform comparison

Market context

Cape Town International Airport is the settlement reference, so the contract will hinge on the day’s *single highest* observed temperature there rather than the citywide average. With the current crowd price at **0% YES**, the market is effectively saying a qualifying high in the target range is viewed as extremely unlikely, even though August is normally a cool winter month in Cape Town, with typical daytime highs clustered around **16–18°C** and overnight lows around **8–11°C**[1][3][10][15][17].

That baseline makes the probability look low by design, but not impossible: comparable August climatology still allows occasional afternoons in the *upper teens Celsius*, and some travel-weather sources note highs can touch the low **20s°C** in favourable spells[7][17]. On a cross-platform read, sportsbook-style weather pricing would usually sit close to broad seasonal averages rather than a precise airport-maximum contract, so the main question is not the month’s mean temperature but whether a brief warm window lifts the day’s peak into the market’s relevant band[1][3][12][15].

The key catalysts are operational rather than scheduled: late-morning to afternoon warming, cloud cover, wind direction, and whether showers limit daytime heating. Because settlement uses the Wunderground history page for Cape Town International Airport, traders will want to watch the intraday maximum as it develops and then the final daily record after the observation window closes; by 3 pm UTC, much of the day’s high may already be in, but a late-afternoon top-up still matters if the local maximum is recorded later[0].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Cape Town on August 3? 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

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

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 Best Prediction Markets. 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.

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.