The Prediction Markets

US Tornadoes in September 2026

Closed
Oct 14, 2026
Traded
$4K
Venues
Polymarket
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This market has closed

Trading ended on Oct 14, 2026. The prices below are the last ones before it closed and no longer update. Browse open markets

Odds by venue

Fair chance strips out each venue’s built-in margin (its prices add up to more than 100%), then blends the venues by how much has traded there, so the outcomes add up to 100%. Best Yes price is the cheapest ask across venues, and the payout is what a winning $100 stake returns before fees. Open a row for each venue’s contract name, bid and ask, and how closely their rules match.

Prices come from our regular polls of each venue, the oldest 2 days ago. Ages are as of when this page was built.

  • Polymarket
50 - 74
67.1%
Polymarket 82%(67.1% fair)polled, 51 h agoBest Yes 99¢ on Polymarket, $100 pays $101 (1.01x)
Polymarket
Contract
50 - 74
Last price
82%
Fair, margin removed
67.1%
As of
Polled 2 d ago
Buy Yes
99¢
Sell Yes
65¢
$100 on Yes pays
$101 (1.01x)
Volume
$527
Trade this on Polymarket
Under 25
12.3%
Polymarket 15%(12.3% fair)polled, 51 h agoBest Yes 30¢ on Polymarket, $100 pays $333 (3.33x)
Polymarket
Contract
Under 25
Last price
15%
Fair, margin removed
12.3%
As of
Polled 2 d ago
Buy Yes
30¢
Sell Yes
—
$100 on Yes pays
$333 (3.33x)
Volume
$779
Trade this on Polymarket
75 - 124
11.4%
Polymarket 13.9%(11.4% fair)polled, 51 h agoBest Yes 27.7¢ on Polymarket, $100 pays $361 (3.61x)
Polymarket
Contract
75 - 124
Last price
13.9%
Fair, margin removed
11.4%
As of
Polled 2 d ago
Buy Yes
27.7¢
Sell Yes
0.1¢
$100 on Yes pays
$361 (3.61x)
Volume
$950
Trade this on Polymarket
25 - 49
8.1%
Polymarket 10%(8.1% fair)polled, 51 h agoBest Yes 19.8¢ on Polymarket, $100 pays $505 (5.05x)
Polymarket
Contract
25 - 49
Last price
10%
Fair, margin removed
8.1%
As of
Polled 2 d ago
Buy Yes
19.8¢
Sell Yes
0.1¢
$100 on Yes pays
$505 (5.05x)
Volume
$657
Trade this on Polymarket
125 or more
1.1%
Polymarket 1.4%polled, 51 h agoBest Yes 2.8¢ on Polymarket, $100 pays $3,571 (35.7x)
Polymarket
Contract
125 or more
Last price
1.4%
As of
Polled 2 d ago
Buy Yes
2.8¢
Sell Yes
—
$100 on Yes pays
$3,571 (35.7x)
Volume
$595
Trade this on Polymarket

Who resolves this market

Polymarket
Polymarket resolves via:
UMA optimistic oracle, source: ncei.noaa.gov

How the odds have moved

The top 3 outcomes on both venues, with the consensus between them. Hover for exact values.

  • 50 - 74
  • Under 25
  • 75 - 124

Order books

Each venue’s resting orders for the selected outcome’s Yes contract, side by side. Top of book streams live; depth refreshes every 15 seconds.

Top of book

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Best bid
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Spread
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Best ask
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Depth · top 8 levels

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Recent trades

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What your stake buys

Enter a stake to see where it buys the most after fees, using each venue’s live order book.

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Buy

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Buys at the asks resting now (taker orders), cheapest after fees first, from order-book snapshots up to 15 seconds old. Fees: Kalshi 0.07 × price × (1 − price) per share, rounded up to the cent; Polymarket 0.05 × price × (1 − price) per share (other / general rate). Fee calculator. Estimates only, not advice.

About this market

Final prediction market prices for "US Tornadoes in September 2026". 50 - 74 last traded at 67.1%. Next is Under 25 at 12.3%. $4K has traded across 5 outcomes on Polymarket. The market closed on Oct 14, 2026.

This market will resolve according to the number of tornadoes recorded in the United States during the specified month, based on the monthly count published on the National Centers for Environmental Information U.S. Tornadoes Time Series page (see: https://www.ncei.noaa.gov/access/monitoring/tornadoes/time-series). Only tornadoes appearing in the final NCEI dataset for that month will count. The brackets are mutually exclusive and collectively exhaustive: each range is inclusive of both of its stated endpoints, and the monthly tornado count falls within exactly one bracket. As of market creation, the relevant report is scheduled to be released on October 14, 2026 at 11:00 AM ET (Release schedule: https://www.ncei.noaa.gov/access/monitoring/dyk/monthly-releases). The market will resolve based on the first relevant tornado count published on the NCEI tornado time-series page after this scheduled release time. If the value published after this scheduled release time is labeled preliminary, it will still determine resolution, and the market will resolve independently of any subsequent revisions, corrections, or retroactive adjustments. The market will not resolve based on any preliminary values published before the scheduled release time. If no data is published by the scheduled release time, or if the NCEI website is temporarily unavailable, this market will remain open until that data is made available. If the relevant data is not made available by the date of the next scheduled publication, this market will resolve based on available data for the most recent prior month. If the NCEI website becomes permanently unavailable, this market will resolve using another credible source.

Questions

What does the consensus price mean?

It is the price of a Yes contract that pays $1 if the outcome happens. A 14¢ price means traders put the chance near 14%. Where two venues list the same outcome, we blend their last prices, weighting the venue with more trading volume more heavily (neither counts for less than a quarter). When only one outcome can win, each venue’s prices add up to a little over 100% (its margin); the fair chance removes that margin so the outcomes add up to exactly 100%.

How is the payout worked out?

A Yes contract pays $1 if it wins, so at the best ask a $100 stake buys 100 ÷ ask contracts. At 18¢ that is about 555 contracts, paying $556 (5.56x) if Yes happens. Venue fees and price slippage on larger orders are not included.

Why do the venues show different prices?

Each venue has its own traders, fees and order book. Contracts can also settle on slightly different terms, which is why each row lists how closely the rules match.

Is a price gap an arbitrage?

Only when you can buy Yes on one venue below what someone pays for Yes on the other, after fees, and both contracts settle the same way. We show the executable bid and ask so you can check.

How fresh are these prices?

Venue prices refresh every few minutes, and the order book and live quotes stream continuously. Each venue’s card shows when we last observed it.

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