PolyWeatherLab
What Polymarket priced, what the weather models said, and what actually happened.

Zhengzhou highs

The market this page measures: highest temperature in Zhengzhou on 28 September 2026 on Polymarket
Whatever the market priced for 2026-09-28, what every weather model forecasts for the same day, and what actually happened, all in °C. The gap column is how far a model sits from the market: above the market it ran warm, below it ran cool. Resolves on station ZHCC.
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models say
22.9 °C
avg of 8 models
market's pick
23.0 °C
2.55% on this strike
gap
+0.47 °C
spread 2.5 °C
actual
not resolved yet

Market odds for 2026-09-28

What Polymarket is paying for each temperature. Each price is the market's probability that the day lands in that strike, so they add up to about 100%. Latest reading 2026-09-28 09:26 UTC, shown in °C.
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temperature °Codds
23.0 °C2.55%
24.0 °C0.05%
25.0 °C0.05%
26.0 °C0.05%
27.0 °C0.05%
28.0 °C0.05%
29.0 °C0.05%
30.0 °C0.05%
31.0 °C0.05%

Every forecast for 2026-09-28

Each model's newest reading for this day, in °C, taken 2026-09-28 06:40 to 08:00 UTC. Gap is the difference from the market, in degrees: a model above the market ran warm, one below ran cool.
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modelforecast °Cgap vs market °C
THE MARKET23.3––
dwd icon global22.0-1.3
meteofrance arpege world22.0-1.3
ecmwf ifs02522.4-0.9
cma grapes global22.7-0.6
best match22.8-0.5
ukmo seamless23.1-0.2
ncep gfs global23.5+0.2
jma gsm24.5+1.2

How the forecasts moved

Every reading we hold for 2026-09-28, newest column first, in °C. The bracket under each time says how long before the day that reading was taken (or after, once the day has started), so the table reads right to left as the day approached. A model still moving in the last day is a model that has not settled, and that is the one to distrust. Older readings are kept but not shown.
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model09-28 08:00 (16h after)09-28 07:00 (15h after)09-28 06:40 (15h after)09-28 06:30 (15h after)09-28 06:07 (14h after)09-28 04:30 (13h after)
THE MARKET–––––23.4
best match–22.822.5–22.5–
cma grapes global––22.722.722.6–
dwd icon global––22.0–22.0–
ecmwf ifs02522.4–22.1–22.1–
jma gsm––24.5–24.5–
meteofrance arpege world––22.0–22.022.0
ncep gfs global––23.5–23.5–
ukmo seamless––23.1–23.1–