Highest temperature in Wellington on June 21?

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Active sub-markets

Market context

Wellington’s airport temperature on 21 June will be settled on the day’s **highest recorded reading**, so the relevant question is not the lunchtime forecast but the intraday peak at Wellington Intl Airport Station. In late June, Wellington is typically in its cool season: WeatherSpark places the winter period as running from early June into September, with average daily highs well below summer levels at Wellington International Airport.[4] That makes the market’s 0% YES pricing on the broadest upside brackets understandable on a pure seasonality basis, although the exact contract bucket will still depend on the realised airport maximum rather than citywide conditions.

Recent Polymarket Wellington temperature markets show how tightly these contracts can cluster around low-teens Celsius outcomes: one June event had 14°C as the clear frontrunner, while another had 15°C dominating with deep liquidity.[1][5] A colder historical anchor is 3 June, which Polymarket has already resolved on the “No” side, underlining that early-winter Wellington highs can sit in modest ranges rather than extreme moves.[2] For comparison, Kalshi and Betfair-style books usually present prices as outright decimal odds or implied probability after commission, while Polymarket commonly shows direct probability; Smarkets also charges commission, so identical weather views can still imply different fair prices after fees and spread. Availability and KYC access also diverge: Polymarket and some crypto-native venues tend to be narrower in geographic reach than exchange-style books, which matters if traders want to arb the same weather view across platforms.

For catalysts, the main variable is the actual airport weather through the settlement window, not any one-off announcement. Wellington’s official airport history pages and Wunderground’s daily record for NZWN are the settlement references, so traders will watch hourly warming, wind shifts, cloud cover and any frontal passage that could cap the day’s maximum before noon UTC.[3][9] In comparison with exchange books, Polymarket can reprice quickly if late-morning temperature prints move towards a new bracket, while fee-bearing books may move more slowly because margin, commission and local account access can blunt small edges.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Highest temperature in Wellington on June 21? 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 Polymarket Alternative, 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'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 it cost to trade on Polymarket Alternative?

Zero. Polymarket Alternative 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, Polymarket Alternative triggers a quick verification flow that finishes in minutes.