Highest temperature in Wellington on July 13?

Platform comparison

Market context

Wellington International Airport is set to record its daily maximum temperature for 13 July 2026, with long-term MetService data showing July highs typically clustering between 11°C and 14°C, averaging near 12°C[1][3]. Historical patterns indicate that outcomes outside this narrow band are rare, framing the current 0% implied probability for any “YES” outcome (likely representing an outlier range) as statistically grounded rather than speculative[1]. On Polymarket, the 13°C range commands 97% of the implied probability, whereas platforms like Kalshi or Betfair would express this as decimal odds of roughly 1.03, highlighting a key divergence in how books present risk: probability percentages versus traditional odds formats[1].

Traders should monitor MetService’s daily forecasts and real-time Wunderground updates, the official resolution source, for any sudden shifts in northerly flow or cloud cover that could push temperatures above 14°C[1][2]. While July 12 saw a confirmed 11°C maximum under clearing skies, the 13th remains subject to light wind variations that could alter the peak by a degree[2]. Unlike Smarkets, which charges lower maker fees but requires stricter KYC for larger bets, Polymarket’s fee structure favours small, anonymous trades but lacks the regulatory oversight of UK-based books[1]. On Kalshi, temperature markets often settle faster with automated feeds, whereas this market waits for manual Wunderground verification, creating a timing dependency that affects liquidity and settlement certainty.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Highest temperature in Wellington on July 13? 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 mid is the canonical probability; the side-by-side columns benchmark fees, KYC, settlement currency and deposit rails so you can choose the venue that fits your jurisdiction and trade size.

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

What does Polymarket cost vs Kalshi?

Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.

Which platform has the deepest liquidity?

Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.

Is Betfair a Polymarket alternative?

Only partially. Betfair Exchange is UK-focused with a sports-betting emphasis; they have politics markets but with thinner liquidity than Polymarket. Settlement in GBP/EUR, 2-5% commission on winnings.

Are all these platforms regulated?

No. Kalshi is CFTC-regulated (US). Betfair and Smarkets are UK Gambling Commission licensed. Polymarket operates without explicit regulation — a different risk profile than a regulated sportsbook.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Robinhood Prediction Markets offers a fiat on-ramp via Klarna or SOFORT (DE/AT/CH) and converts internally to USDC for the Polymarket order book. T+1 processing.