Wellington April 1 High Temp: Market Locks In at One Hundred Percent

Wellington’s April 1 daily high temperature market has done something unusual: it resolved in real time. The 17°C outcome sits at 100% probability as of 04:44 NZST on April 1, which means the market isn’t predicting anymore. It’s confirming. The measurement either happened or is happening right now, and traders have priced that in with everything they have.

The Polymarket contract on the highest temperature in Wellington on April 1 currently prices 17°C at $1.00 (100% implied probability), with 0°C assigned to every alternative outcome. The contract resolves at 2026-04-01 12:00:00, with $267,082 in total volume and $215,854 in available liquidity.

How the Wellington Temperature Contract Works

This contract asked traders to pick the exact degree Celsius for Wellington’s daily maximum on April 1, 2026. Resolution follows actual meteorological measurement, most likely drawn from NIWA (National Institute of Water and Atmospheric Research) or MetService New Zealand station data. Wellington Airport or Kelburn Observatory are the standard reference points for official daily maximums.

• YES (17°C): Wellington’s highest recorded temperature on April 1 equals 17°C. Price: $1.00. Probability: 100%. Resolves: 2026-04-01 12:00:00.
• NO (all other outcomes): The daily high falls on any other outcome bracket including 16°C, 18°C, 19°C, 20°C or higher, or any value below 16°C. Price: $0.00. Probability: 0%. Resolves: 2026-04-01 12:00:00.

A NO buyer would need the official daily maximum to register outside the 17°C bucket before resolution. With the contract at 100% and resolving in hours, that window is effectively closed. The risk for NO isn’t just directional, it’s temporal. Even if conditions shifted dramatically, there’s no time for a meaningful temperature swing large enough to cross into an adjacent bracket before noon.

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Momentum and Market Signals

The 24-hour move of plus 71.5% tells the whole story, but the detail matters. Price history shows three separate upward moves on March 31: plus 5.5%, then plus 42%, then plus 7.6%. That staircase pattern is a classic confirmation sequence. Each step corresponds to traders updating on incoming forecast data, then observed conditions, then near-certainty as the actual measurement window opened. The 1-hour signal is flat at 100% because there’s nowhere left to go.

Total volume of $267,082 with $145,381 trading in the last 24 hours indicates the conviction move happened fast. For a science market of this type, that volume is substantive. The $215,854 in liquidity means the order book has depth, but at 100%/$0.00, that liquidity is essentially a formality. No rational trader is selling 17°C at this point. The market is pricing a confirmed outcome, not a probability.

Key Factors:

• 24-hour price change of plus 71.5% reflects traders moving from genuine uncertainty to near-certainty as April 1 morning conditions became observable in Wellington.
• 1-hour momentum is flat at 100%, consistent with a market that has finished its price discovery function and is waiting on administrative resolution.
• Three sequential price jumps on March 31 (plus 5.5%, plus 42%, plus 7.6%) show the market processed forecast data in real time, not all at once.
• $145,381 in 24-hour volume against $267,082 total means more than half of all trading happened in the final day, concentrated around the confirmation window.
• Open interest at $0 confirms no unresolved positions remain on the losing side. Capital has already cleared to the 17°C outcome.

NIWA Data and the Wellington Temperature Measurement

Here’s what the measurements are telling us: April 1 in Wellington sits inside the autumn shoulder season. NIWA climatological data for Wellington shows April daily maximums typically ranging from 14°C to 19°C, with the long-run April mean around 15°C to 16°C at Kelburn Observatory. A 17°C reading on April 1 is entirely consistent with a mild autumn day, slightly above the April mean but well within the historical distribution. Nothing about that figure requires an anomalous weather event.

The market didn’t need a dramatic scientific development to reach 100%. It needed the morning to happen. Wellington’s April 1 conditions arrived, stations recorded a maximum consistent with the 17°C bracket, and traders responded. The data doesn’t care about the politics, and in this case it doesn’t need to. A thermometer reading isn’t contested the way an emissions pathway or a policy vote is.

Signals to Monitor Before Resolution:

• MetService New Zealand or NIWA publishing the official Wellington daily maximum before 12:00 NZST would lock this contract permanently. Any figure in the 16.5°C to 17.4°C range rounds to 17°C depending on resolution rules.
• Resolution methodology matters here. If the contract uses a specific station (Wellington Airport vs. Kelburn) or a specific rounding convention, a borderline reading near 16.5°C or 17.5°C could theoretically reprice. That risk is now priced at zero.
• Wind and cloud patterns over Wellington on April 1 morning could push the actual maximum slightly higher or lower. Northerly flow typically warms the city. A southerly change would cool it.
• Polymarket’s resolution process introduces a small administrative lag. The market resolves at 12:00 NZST regardless of when MetService publishes official figures.

The market is pricing certainty, not science, at this point. The $267,082 in total volume shows genuine engagement across the resolution window, and the staircase price history shows traders processed information as it arrived rather than front-loading a guess. That’s a well-functioning hyperlocal weather market doing exactly what it’s supposed to do. The 17°C outcome has captured everything.

LINES VERDICT

SEVENTEEN DEGREES CONFIRMED

The Wellington April 1 temperature market has completed its price discovery function. The 17°C bucket is at 100% because conditions on the ground matched the contract, not because traders are speculating.

What the market says: One hundred percent probability with resolution in hours. Volatility before the 2026-04-01 12:00:00 cutoff is theoretically possible only if a measurement dispute or data anomaly emerged, which the current price treats as a zero-probability event.

Key unknown: The single remaining variable is the official station reading and rounding convention used for resolution. If MetService Wellington logs a figure right at a bracket boundary (say, 17.5°C or 16.5°C), Polymarket’s resolution rules determine whether 17°C or an adjacent outcome wins. That’s the last open question in an otherwise closed market.