Highest temperature in Cape Town on July 13?

Platform comparison

Market context

Cape Town is experiencing its coldest month, with July historically delivering average highs near 17°C (63°F) at the International Airport, making extreme heat an anomaly rather than a risk [2]. The crowd-implied probability of 0% YES for any high-temperature range above the typical mid-10s reflects this seasonal certainty, positioning the market as a heavy favourite for the lower bands. Historical data confirms July 2026 has already seen daily highs oscillating between 15°C and 20°C (59°F–68°F), reinforcing the consensus that a temperature spike is statistically negligible [1][4].

Traders should monitor the Wunderground archive for the Cape Town International Airport Station (FACT) as the settlement clock ticks toward 12:00Z, though no contrarian angle offers value given the thermal inertia of the Southern Hemisphere winter [7]. The resolution source explicitly tracks the highest recorded temperature for all times on 13 July, but recent forecasts show overnight lows dipping to 7°C (43°F) with no atmospheric catalysts for a sudden heatwave [4]. With the settlement window closing today and the historical ceiling for mid-July firmly below 22°C, the 0% probability represents fair value rather than a mispriced underdog opportunity [3].

Sources: 1 · 2 · 3 · 4 · 5

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 Who Will Win, which mirrors the Polymarket order book directly.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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 Who Will Win. 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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Who Will Win trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.