Highest temperature in Beijing on July 9?

Platform comparison

Market context

The crowd-implied probability of 0% for a specific high-temperature range in Beijing on 9 July 2026 reflects a sudden shift in local forecast models over the last 48 hours, which now predict a cooler, cloudier start to the month than earlier projections suggested. Current data indicates daily highs for early July will likely hover between 24°C and 32°C, with today’s conditions at the Capital International Airport showing 24°C under hazy skies and 91% humidity, significantly dampening the likelihood of extreme heat spikes in the immediate settlement window[4].

Historically, July is Beijing’s hottest and wettest month, with daytime temperatures typically ranging from 25°C to 33°C and a maximum recorded of 38°C, yet the first week often avoids the peak heat and heavy rainfall that characterise the latter half of the month[2][3]. While temperatures can reach 40°C during heatwaves, the statistical probability of hitting the upper extremes in the first week remains low, as the rainy season and frequent thunderstorms usually intensify between the 20th and 30th, making early July a comparatively milder period[2][3].

Traders should monitor the upcoming meteorological bulletins from the China Meteorological Administration regarding the onset of the monsoon front, as any delay in the rainy season could trigger a rapid temperature rebound. Recent climate reports confirm that July rainfall averages 170mm to 185mm with 14 rainy days, meaning a sudden shift in precipitation schedules is the primary catalyst for temperature volatility in the coming days[2][8]. Watch for announcements on the timing of the monsoon front, as a delayed arrival could create the conditions for a short-term heat spike before the rains fully establish.

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.