Highest temperature in Singapore on July 1?

Platform comparison

Market context

The underlying event is the peak daytime heat at Singapore Changi Airport on 1 July 2026, a date historically synonymous with the city’s hottest annual window. Climatological data confirms July daily highs average 31°C (88°F), rarely dipping below 30°C or exceeding 33°C, with the all-time national record sitting at 37°C set in Ang Mo Kio forty years ago and recently matched [1][3][7]. Given this stable thermal ceiling, the crowd-implied probability of 0% for any temperature range above the current consensus suggests a near-total dismissal of outlier heatwaves, positioning the market as a heavy favourite for the standard 30–32°C band and an underdog for anything exceeding 34°C.

Traders should monitor the Singapore Meteorological Service’s weekly climate bulletins and any regional announcements regarding reduced cloud cover or intensified monsoon troughs, which are the primary catalysts for anomalous spikes [2][5]. While global average temperatures reached record highs in July 2024, Singapore’s local microclimate remains buffered by maritime influence, making a 37°C event at Changi statistically improbable without a specific, severe weather trigger [9]. The value spot likely sits contrarian to the 0% consensus if any forecast models predict a prolonged period of clear skies and high-pressure dominance, as the current pricing ignores the tail risk of a 35°C+ day that, while rare, has occurred within the last decade in neighbouring districts. The consensus is firmly anchored in historical averages, yet the true value may emerge if traders spot a deviation in the upcoming week’s humidity and wind patterns that could push Changi toward the upper historical limit.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Singapore on July 1? 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

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

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.

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 Who Will Win 2026 trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.