Highest temperature in Guangzhou on June 27?

Platform comparison

Active sub-markets

Market context

Guangzhou on 27 June 2026 faces a day of extreme heat and humidity, with historical records showing the city’s peak temperature reaching 36.6°C, while June typically averages between 25°C and 32°C under heavy downpours and subtropical high-pressure influence[1][2]. The current crowd-implied probability of 0% YES for the highest temperature falling in a specific range suggests traders believe conditions will likely stay below that threshold, possibly due to expected thunderstorms or cloud cover that could suppress peak temperatures[4].

Historically, May 2026 saw Guangzhou hit 36.3°C during a rare stretch of continuous sunny days, marking it as the hottest May in history, yet June remains wetter with frequent thunderstorms that often cap temperatures around 31°C[5][4]. This divergence between dry, hot spells and stormy, cooler periods frames how to interpret the 0% probability: traders may be betting on rain-driven cooling rather than a heatwave, especially given June’s average rainfall of 280 mm and occasional typhoon activity[1].

Traders should monitor real-time weather updates from Wunderground for the Baiyun International Airport Station, as sudden shifts in cloud cover or storm intensity could alter peak temperatures[7]. Recent reports from People’s Daily highlight Guangzhou’s vulnerability to rapid temperature swings, with May’s record heat underscoring how quickly conditions can change[5]. On platforms like Polymarket versus Kalshi or Betfair, the key differences lie in decimal odds versus implied probability displays, fee structures, and KYC requirements, which may affect how traders price this weather-dependent outcome[1].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Highest temperature in Guangzhou on June 27? from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live quote comes directly from the Polygon order book; the other three are listed with their platform attributes — fees, KYC, settlement currency, payment options — because a 1:1 contract comparison without API access would be guesswork.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

FAQ

Where can I trade this market with the lowest fees?

On PolyGram, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

What does it cost to trade on PolyGram?

Zero. PolyGram routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

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?

Not under $1,500 of lifetime trading volume. Above that threshold, PolyGram triggers a quick verification flow that finishes in 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.