Highest temperature in Singapore on July 8?

Platform comparison

Market context

Singapore is bracing for a significant shift in its weather pattern as the El Nino phenomenon is expected to arrive from July, bringing notably hotter conditions to the region. The Meteorological Service Singapore has confirmed that global climate models predict moderate El Nino conditions, with a 30% chance of the phenomenon being stronger than normal, which directly impacts the likelihood of record-high temperatures on 8 July 2026 [5]. This emerging forecast explains why the current crowd-implied probability for the highest temperature falling in the expected range has dropped to 0% YES, reflecting a market recalibration based on this new directional signal rather than historical noise.

Historically, Singapore’s daily maximum temperatures in July cluster tightly between 31°C and 33°C, with the average high for the month sitting at 32°C (88°F) [1][3]. Comparable markets for early July dates, such as the 2 July contract where 31°C was priced at 50.5%, have shown genuine meteorological uncertainty rather than strong conviction, often resolving to adjacent values like 30°C or 32°C due to the narrow volatility of daily peaks [2]. The current 0% probability suggests the market now anticipates a deviation from this tight cluster, likely driven by the incoming El Nino heatwave pushing temperatures beyond the typical 33°C ceiling.

Traders should closely monitor the Meteorological Service Singapore’s upcoming three-to-six-month forecast release on 20 March, which will provide definitive data on El Nino intensity and its specific thermal impact on Singapore [5]. Additionally, daily temperature readings from the official Changi Climate Station, measured by the Meteorological Service Singapore, will serve as the primary resolution source, with Wunderground acting as the public data aggregator for the final settlement [2]. Any sudden announcements regarding regional cloud cover or precipitation levels, which typically occur for roughly 8 to 15 days in July, could further alter the daily maximum temperature trajectory [4].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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 Prediction Today. 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.

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.