Highest temperature in Istanbul on July 9?

Platform comparison

Market context

The underlying real-world event is the highest temperature recorded at Istanbul Airport on 9 July 2026, measured in degrees Celsius by NOAA. Current Polymarket pricing for this contract sits at 0% YES, implying the crowd believes the temperature will not reach the specified threshold. This near-zero probability aligns with long-term averages for Istanbul in July, where daytime maximums typically reach 27°C with low heat and humidity[2]. Historical data shows first-ten-day highs averaging 27.2°C, while the driest month in Turkey sees minimal rainfall of only 17mm across the region[1][4]. Even Turkey’s national heat record of 50.5°C was set in Silopi, far from Istanbul’s coastal climate, reinforcing that extreme spikes are unlikely in this location[9].

Traders should monitor NOAA’s daily time-series updates for Istanbul Airport (site LTFM), as the market resolves strictly on the first published data point for 9 July. Any sudden shifts in regional wind patterns or unseasonal cloud cover could alter the peak temperature, though such events remain rare in July’s stable weather regime. Recent forecasts from AccuWeather indicate daily highs in Istanbul ranging from 80°F to 91°F (26.7°C–32.8°C), suggesting the threshold may be plausible but not guaranteed[5]. The on-chain mechanics involve USDC settlement on Polygon, with conditional tokens determining payout based on the final NOAA reading. Watch for official NOAA announcements or weather model revisions that could signal unexpected heatwaves, as these are the primary catalysts for probability shifts in this market.

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 Kalshi UK, which mirrors the Polymarket order book directly.

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 Kalshi UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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 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.

Do I need to KYC for this market?

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