Highest temperature in Wellington on August 1?

Platform comparison

Market context

Wellington airport’s highest temperature on 1 August will be a short-lived winter warm-up, not a summer-style swing. Late-July and early-August normals for Wellington are modest: August daytime highs are typically around 12°C to 13°C, with the monthly average near 10°C to 11°C and the warmest days only occasionally pushing into the mid-to-high teens.[1][11][14] For a market that settles on the day’s maximum at Wellington Intl Airport Station, the practical read is that the threshold for each temperature band should be anchored to a narrow range around the climatological high, rather than to any extreme event.[10][13]

The 0% implied probability of a top-end outcome is consistent with how rare pronounced August warmth is in Wellington. Historical August records cited by weather databases put the month’s absolute maxima around 13.8°C to 18°C depending on station and dataset, with the more recent airport-linked histories clustering near the low-to-mid teens rather than the 20s.[4][5][6][11] Programmatically, traders would normally model this kind of market with a weather feed or forecast API, then map the expected maximum into the market’s discrete settlement bands; if the updated forecast and nowcast both sit below a given threshold, copy-trading or conditional order logic tends to concentrate bids in the nearest lower range.

For the final stretch, the main catalysts are the official forecast updates, any shift in wind direction, cloud cover, or frontal timing, and the exact observation source used by Wunderground for the airport station.[1][10] In Wellington, those details matter because a brief northerly or a delayed rain band can move the day’s peak temperature by a degree or two, which is enough to change the settlement bucket. Traders watching this programmatically should check the hourly forecast path rather than the daily summary, then reconcile it against the Wunderground history page at the settlement cut-off.

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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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 Polymarket Review UK. 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.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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.