Highest temperature in Cape Town on August 3?

Platform comparison

Market context

Cape Town International Airport’s highest temperature on 3 August will be set by the warmest reading logged at the station before the midday settlement cutoff. For a programmatic approach, the key is to poll the Wunderground daily history page for FACT and map the maximum Celsius value to the market’s published temperature bands, rather than relying on city-wide forecasts or nearby stations.

The current 0% YES price is consistent with the seasonal baseline: August in Cape Town is normally winter-to-early-spring, with average highs clustered around 16–18°C and average lows around 8–11°C, while wetter, cloudier conditions are common. AccuWeather’s August outlook for Cape Town shows daily highs of 56° to 68°F, which aligns with a mild but rarely hot profile, so very high intraday readings are unusual but not impossible.[1][3][5][10][14] If you are modelling this market, the relevant historical analogue is the upper tail of August afternoons rather than the monthly average, because the resolution depends on the day’s maximum, not the mean.

Traders should watch for any synoptic shift that can briefly lift inland temperatures over the airport: offshore flow, post-frontal clearing, or a weak berg-wind setup would matter more than routine day-to-day weather. The practical workflow is to automate a check on forecasts and station observations, then adjust conditional orders when the predicted daily maximum moves across the market’s settlement bands; if a cold front lingers, the ceiling stays low, but a clear, drier spell can lift the day’s peak quickly. Using the airport station as the source also means the live obs path matters more than broader Cape Town forecasts, which may describe the city as a whole rather than the exact settlement point.[1][3][14]

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 Polymarket Review UK. 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'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 Polymarket Review UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.