Why weather is the lowest-competition category on Polymarket
Weather and climate markets on Polymarket cover about 210 weather contracts and 280 temperature-records contracts as of April 2026. That's a little under 500 markets total - the smallest retail slice of the platform. Depth runs $5K-$50K on flagship hurricane lines. It rarely tops $150K, even at peak Atlantic season.
That thin size exists for one reason. The few traders here read the data better than most retail. And casual bettors avoid markets that take five months to settle.
That's exactly the opportunity. Weather markets reward number discipline. You read NOAA, NASA GISS, GFS, and ECMWF output like a pro, or you lose to someone who does. (NOAA is the US weather agency; GFS and ECMWF are the two main forecast models.) We'll cover the four weather sub-areas: hurricanes, temperature records, ENSO, and seasonal. We'll cover the model-update schedule that drives most price moves. And we'll cover the sizing math that makes long lockups worth it.
The weather market map
Weather markets split cleanly into four sub-areas. Each runs on a different data source and a different update schedule. Reading the map shows you where liquidity lives, and which markets pay off the deepest research. See market types for how they resolve, and position sizing for the long-lockup math.
Four sub-verticals, four edge sources
| Sub-vertical | Active markets | Typical depth | Data sources | Edge source |
|---|---|---|---|---|
| Hurricane & tropical storm | ~65 (seasonal) | $10K-$150K during Atlantic season | NHC advisories, NOAA GFS, ECMWF | Model-run cadence + historical base rates |
| Temperature records (annual / monthly / city) | ~280 | $5K-$40K | NOAA NCEI, NASA GISS, Berkeley Earth, Copernicus | Reading three datasets against a single market |
| ENSO / climate cycles | ~15 | $3K-$25K | CPC ENSO diagnostics, NOAA OOI buoy data | Month-over-month SST anomalies |
| Seasonal snowfall & rainfall | ~130 | $1K-$10K | Station-level NOAA data | Highly location-specific - low-liquidity warning |
Hurricane markets - the flagship weather trade
Hurricane season runs June 1 through November 30 in the Atlantic (the Eastern Pacific runs May 15 - Nov 30). About 70% of yearly weather-market volume packs into that six-month window. During active storms, the NHC (National Hurricane Center) issues full advisories every six hours: 03:00, 09:00, 15:00, and 21:00 UTC. For storms threatening land, it adds updates every three hours. Those advisory releases are the clearest news events in the whole weather category.
The three most common hurricane market types
- Will [named storm] make landfall as Cat X+? - resolves on NHC post-storm reports
- Total named storms this season > N? - resolves against the Atlantic Hurricane Database (HURDAT2)
- Accumulated Cyclone Energy (ACE) > X? - climate-index market, resolves on NOAA CPC seasonal summary
Model-update cadence and what moves prices
| Model / product | Run cadence | Publish delay | Typical impact on markets |
|---|---|---|---|
| NOAA GFS (Global Forecast System) | 4× daily: 00Z, 06Z, 12Z, 18Z | ~3.5 hours after run start | Short-term drift; most markets quote the 12Z run |
| ECMWF HRES (IFS) | 2× daily: 00Z, 12Z | ~7 hours after run start | Stronger medium-range signal (5-10 day) |
| NHC advisories (active storms) | Every 6 hours (intermediate every 3) | Real time | Largest single-release price moves |
| NOAA CPC seasonal outlook | Monthly, ~15th of each month | Same day | Seasonal over/under markets |
| HURDAT2 post-season | Annual (late December) | 30-60 days delay | Final resolution reference |
Temperature-record markets - the steadiest edge
Temperature-record markets ask things like "Will 2026 be the hottest year on record?" or "Will NYC hit 100°F before July 1?" They settle against one of four datasets: NOAA NCEI (the U.S. government set), NASA GISS (global surface temperature), Berkeley Earth, or Copernicus ERA5. Most markets name one dataset in the rules. Always read which one.
Why this is the steadiest edge on the platform
- Data comes out on a set monthly schedule (NOAA NCEI usually by the 15th of the next month)
- You get a mid-month view: NCEP updates the running 30-day anomaly daily
- Few casual traders means wide quotes and spreads of 1-3 cents
- Base rates run 100+ years deep and stay perfectly stable
Dataset quirks worth knowing
- NOAA NCEI reports in °F for the U.S. and °C for global. It releases around the 15th each month.
- NASA GISS reports land-only and land-ocean separately. It differs from NCEI by small but steady amounts, usually within 0.03°C.
- Berkeley Earth gives city-level data with uncertainty bands. That's useful for metro-area markets.
- Copernicus ERA5 posts monthly data about 5 days into the next month. It's often the fastest set available.
ENSO cycles and the 6-month forward macro bet
ENSO is the El Niño / La Niña / Neutral cycle. NOAA CPC declares the state from Niño-3.4 region sea surface temperatures (SST), using a ±0.5°C threshold against the 30-year base. A state must hold for five straight overlapping three-month seasons to be official. ENSO drives hurricane seasons, U.S. temperatures, and global rainfall. So it shapes every seasonal prediction market downstream.
How ENSO state maps to market behaviour
| ENSO state | Atlantic hurricane count | U.S. winter impact | Best markets to trade |
|---|---|---|---|
| Strong El Niño | Suppressed (avg 9-11 named) | Warmer northern U.S., wetter south | Under-count hurricane markets, south-US precipitation |
| Moderate El Niño | Near normal (12-14) | Modest warming north, mild south | Flat - mostly avoid |
| Neutral | Normal (14) | Pattern-following | Default season |
| Moderate La Niña | Elevated (16-18) | Drier southwest, cold north | Over-count hurricane, snow-belt |
| Strong La Niña | Highly elevated (18-22) | Sharp cold snaps, drought southwest | Hurricane over-count, southwest drought |
NOAA CPC issues an ENSO Diagnostic Discussion on the second Thursday of every month. Add the weekly Niño-3.4 SST readings on Mondays, and you get a clean monthly schedule for ENSO-sensitive markets.
Model-run cadence - the information clock
Unlike sports or politics, weather markets run on a clean information clock. Know exactly when the next model run publishes, and weather trading becomes a patience game with fixed-date catalysts. If you can hold cash through a model-update window that others miss, you have an edge.
The 24-hour information clock
| UTC time | What publishes | Market impact window |
|---|---|---|
| 00:00 UTC | GFS + ECMWF 00Z runs kick off | Heaviest trading 03:00-05:00 UTC |
| 03:30 UTC | GFS 00Z run complete | First priceable signal |
| 06:00 UTC | GFS 06Z run kicks off | Quiet for markets |
| 07:00 UTC | ECMWF 00Z HRES complete | Strongest medium-range repricing |
| 12:00 UTC | GFS + ECMWF 12Z runs kick off | Heaviest U.S.-hours trading |
| 15:30 UTC | GFS 12Z run complete | U.S. morning repricing |
| 19:00 UTC | ECMWF 12Z HRES complete | U.S. afternoon repricing - biggest retail reaction |
The capital-lockup problem (and how to size around it)
A big hurricane over-count market opens in May and resolves in late December. That's 7 months of locked-up cash. A "hottest year on record" market opens in January and resolves the next January - 12 months. These long timeframes crowd out your other trades. So your sizing has to account for that cost.
Capital budget table for a weather trader
| Timeframe | Maximum bankroll allocation | Why |
|---|---|---|
| Under 1 month (short storms) | 10-15% of weather sleeve | Fast turnover, normal sizing |
| 1-3 months (monthly temperature records) | 15-20% | Intra-cycle data reads still available |
| 3-6 months (hurricane season totals) | 20-25% | Bigger thesis, half-cycle checks possible |
| 6-12 months (annual records, ENSO declaration) | 10-15% | Long lockup - don't stack these |
| 12+ months (multi-year climate records) | < 5% | Too long; only asymmetric asymmetric payoffs |
Fees, makers and why weather is a maker's market
Weather sits in the Culture/Economics/Weather fee tier. The max taker fee is 1.25% at the 50¢ midpoint. The maker rebate returns 25% of that to liquidity providers. Daily volume is thin, so a patient maker who quotes both sides can grab an outsized share of the ~$5M/month liquidity rewards pool. See the liquidity rewards guide for the 3-minute rule and the scoring math. Weather is the quietest market-making spot on the platform, and it rewards makers who show up often.
Taker vs maker economics in weather markets
- Taker at 1.25% on a $500 position: $6.25 one-way, $12.50 round-trip. You need a 3%+ true edge to come out ahead
- Maker at a 1¢ spread with a patient entry: zero fee plus a rebate. This works on 1-2% edges
- Makers gain more in weather than anywhere else, because casual traders show up in bursts (NHC advisories), not all day
Historical base rates - the anchor for every weather market
Weather markets reward traders who know the base rates cold. For hurricane over/under markets, Atlantic named-storm totals since 1950 have averaged 14 per season, with a standard deviation of about 4. Since 1995, only 17% of seasons had under 12 named storms, and only 12% had over 20. A market priced outside those tails is either wrong, or it's telling you ENSO state matters more than the raw numbers.
Atlantic hurricane season base rates (1995-2024, 30-year window)
| Metric | 30-year mean | Below-normal threshold | Above-normal threshold |
|---|---|---|---|
| Named storms | 14.4 | < 12 | > 17 |
| Hurricanes | 7.2 | < 6 | > 9 |
| Major hurricanes (Cat 3+) | 3.2 | < 2 | > 5 |
| Accumulated Cyclone Energy (ACE) | 122 | < 73 | > 159 |
| U.S. landfalls (named storms) | 3.8 | < 2 | > 6 |
Say an "over 14 named storms" line prices at 52¢ in April (pre-season). Now you have a base rate to compare against. If ENSO is trending La Niña and the CPC outlook calls for an above-normal season, 52¢ is probably cheap. If ENSO is trending El Niño, 52¢ is probably fair to pricey. The April window is noisy, though. NOAA's Climate Prediction Center issues its first formal hurricane-season outlook only in late May. So any April position carries a one-month "before-the-outlook" risk. That has historically swung 40-60 cents either way once the outlook drops.
Temperature-record pricing walkthrough - 2026 as a case study
Let's work a 2026 annual temperature-record market end to end. In January 2026, the "Will 2026 be the hottest year on record?" line opened at 38¢. That was a fair starting price. 2024 had been the hottest year on record globally (both NASA GISS and NOAA NCEI confirmed it), and 2025 fell about 0.08°C short. The cost is six months of tied-up cash. So a disciplined trader reads the price against the data-release calendar and decides if the trade is worth it.
The four data reads you check monthly
| Data release | Cadence | What to do with it |
|---|---|---|
| Copernicus ERA5 monthly anomaly | Roughly 5 days into next month | First read - fastest public dataset |
| NASA GISS monthly GISTEMP | Mid-month (~14th) | Confirm or challenge the ERA5 read |
| NOAA NCEI global monthly | Mid-month (~15th) | Official U.S. government reference |
| Berkeley Earth monthly update | Late month (~25th) | Independent academic cross-check |
By March 2026, Q1 was running 0.12°C above the 2024 Q1, which was itself a record-warm quarter. That pushed the "hottest year 2026" line from 38¢ to 61¢ over February and March. Traders who bought at the opening 38¢ and held through the March 15 NOAA NCEI release captured a +60% move. The edge came from three things. Patience, steady monthly data reads, and one key fact: since 1990, Q1 warm spells have carried through the full year 73% of the time.
Markets to avoid and why
Not every weather market is worth trading. Three types belong on the "do not touch" list, no matter the price.
Three "do not trade" weather archetypes
- Single-city "first frost" or "first snow" markets - they settle on one station, which can go offline or reset. The dispute risk is real
- Snow-day markets tied to one school district - they settle on an administrator's call, not on weather data
- Very local rainfall totals (under a 0.25 inch margin) - single rain gauges are noisy enough to spark a UMA dispute. See the UMA disputes guide for the 2-hour challenge window and the $750 bond
Best practices for new weather traders
Weather markets reward patience more than any other category. Here's the discipline that separates the winners from the 84.1% who lose.
What's Next?
- Market types - how weather, sports and politics each resolve
- Position sizing - Kelly sizing for long-lockup markets
- Liquidity rewards - how to earn rebates as a weather market maker
- UMA disputes - the dispute window that can affect single-station rainfall markets
- Risks & losses - capital-lockup risk and the 57% under-$100 cohort
