Highest temperature in Wellington on June 30?

Platform comparison

Market context

The real-world event this market tracks is the highest air temperature recorded at Wellington International Airport on 30 June 2026, measured in degrees Celsius and resolved via Wunderground data. With the crowd-implied probability for a "YES" outcome sitting at 0%, the market effectively treats any temperature outside the expected 11–12°C range as impossible, mirroring the near-certainty seen in the adjacent 29 June market where 12°C was favoured at over 12% [5][6]. Historical June averages for Wellington show daily highs declining from 57°F to 54°F (roughly 14°C to 12°C), rarely dipping below 50°F (10°C) or exceeding 62°F (17°C), which frames the current 0% probability as a reflection of normal seasonal stability rather than an anomaly [4].

Traders approaching this programmatically should monitor real-time Wunderground feeds and cross-reference with NIWA and MetService alerts for unexpected warm spells, as June 2026 has already seen Wellington record temperatures 3°C above normal and break its historical June maximum with a reading of 22.8°C [7][9]. The MetService has flagged this warmth as "record breaking" and "exceptional" for the season, suggesting that while the market assumes 12°C, any deviation could hinge on sudden wind shifts or cloud cover changes typical of coastal coastal dynamics [9]. A power-user would script conditional orders to trigger if Wunderground reports exceed 13°C, given that the 29 June market showed a 12.4% probability for 13°C, indicating non-zero tail risk [5]. The settlement window closes at 12:00 UTC on 30 June 2026, so latency in data ingestion must be accounted for in any automated strategy.

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 Kalshi Fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Kalshi Fees trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

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.