Highest temperature in Wellington on June 21?

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Market context

Wellington’s maximum temperature at the airport on 21 June will be decided by how far the afternoon can climb from a cool, windy start. Current observations at Wellington International show 15°C, mostly cloudy skies and a south-south-westerly wind, while BBC Weather is calling for thundery showers and a gentle breeze, with a forecast range of 9°C to 11°C on Sunday. That leaves the market anchored to a relatively low daytime ceiling unless the cloud and showers clear earlier than expected.[1][6]

The 0% YES price looks far below the climatology traders would normally use for a June contract, because Wellington’s June average daily high at the airport is only about 54°F to 57°F, or roughly 12°C to 14°C, and the city spends much of the month under cloud.[2][5][7] That said, the market description settles on the highest reading recorded across the day rather than the noon-to-noon average, so a brief warm spike can matter more than the day’s overall feel. MetService also said Wellington had already exceeded its record June maximum this month, with temperatures above 19°C, which shows that outlier warmth is possible even in winter, although it remains unusual.[4]

For cross-platform context, the key comparison is between the prediction market’s 0% YES and the more conventional weather outlooks: bookmaker-style lines are not quoted in the sources here, but the forecast distribution in the public weather services is clearly skewed towards a modest maximum rather than a hot one.[1][6][7] Traders should watch the airport observations through the midday and early afternoon UTC window, especially any clearing behind the current rain band and any change in wind direction, because Wellington’s exposed airport site can swing quickly if sunshine arrives. The settlement source is Wunderground’s daily history page for NZWN, so the final print will depend on the single highest airport observation, not on city-wide conditions or forecast highs.[1]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote (Polymarket), four reference venues with their key attributes, and a single execution path — every trade button routes to Best Prediction Markets, which mirrors the Polymarket order book directly.

Resolution & payout

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FAQ

Where can I trade this market with the lowest fees?

On Best Prediction Markets, 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.

Is this market available outside the US?

Best Prediction Markets is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

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 Best Prediction Markets?

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

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.