Highest temperature in Istanbul on July 4?

Platform comparison

Market context

On 4 July 2026, the Istanbul Airport will record its peak temperature for the day, a single data point that determines whether the market resolves to the 25°C range or any other value. The crowd-implied probability of a YES outcome sits at 0%, reflecting a consensus that the temperature will almost certainly exceed 25°C. This aligns with historical norms where Istanbul’s July 4 mean maximum historically runs between 27°C and 29°C, rarely dipping below 25°C even on cooler days [3]. Recent data confirms an immense increase in daily highs across Turkey, with July 2025 marking the nation’s hottest in 55 years and reaching a record 50.5°C nationally [7][9]. While the airport site may be cooler than inland extremes, the baseline of 82°F to 85°F (28°C–29°C) makes a sub-25°C reading an extreme outlier, effectively an underdog scenario with no visible value [1].

Traders should monitor the sea-breeze influence and short-term steering patterns, which introduce variability even in stable July conditions [2]. A key dependency is the timely publication of the first NOAA data point for 4 July, as the market cannot resolve until this is available [market description]. Recent heatwave activity in southern Turkey, including 49.1°C in Kurtalan, signals a broader warming trend that could elevate Istanbul’s airport readings [6]. Although no specific announcement for 4 July exists, the overarching pattern of record-breaking temperatures suggests the consensus of “NO” is well-founded, leaving little room for contrarian value unless an unexpected cold front intervenes. The value spot, if any, lies not in betting YES but in assessing whether the temperature might breach 30°C, a range not currently priced but plausible given the 2025 record [7].

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 2026, 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 2026. 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.