For agents

Game Day Weather posts a weather call for every NFL game: FLAG, WATCH, CLEAR, or DOME, based on the kickoff window. Your agent can read it straight from us as JSON. No scraping needed.

It’s free. Just cite us.

This page: https://gamedayweather.app/agents

Endpoints

Path	What you get
GET /api/board.json	This week’s board
GET /api/board/{weekId}.json	One week, e.g. /api/board/2026-w04.json

curl -s https://gamedayweather.app/api/board.json \
  | jq '.games[] | {gameId, call, note}'

{
  "gameId": "2026-w04-ne-buf",
  "call": "WATCH",
  "note": "WATCH — Highmark chance rain showers at kick (PoP 33% / 16 mph / 67°F) then mostly sunny..."
}

No key, read-only, CORS open. If a week has no saved board, you get a 404 that points you to report cards.

Rate limit: 10 requests a minute per IP across /api and /mcp. Over that you'll get a 429 with Retry-After. The board only changes at the posting times below, so cache it and check nextUpdate.

How to read a game

call first. That’s our call. Use it as-is.
note next. It’s the why in plain words: roof TBD, storms building late, sources disagreeing.
Chips and hours last. chip is what the threshold rules say about kick ±2h. It backs up the call. If callMatchesChip is false, the note explains why, and the call still wins.

Don’t flag a game off one number. A 29% rain chance three hours after kick on a CLEAR game is a quiet afterTip, not a flag.

Retractable roofs: if roof.state is tbd, the call assumes the roof is open (roof.outdoorLean). roof.status is the club announcement (open, closed, or TBD). It does not change the call. Sideline relabels the next board if a closed roof should be DOME.

What the calls mean

FLAG: material weather in the kickoff window. Think kickers, deep shots, wet grass.
WATCH: wind, rain, cold, or storms worth a look before lock.
CLEAR: nothing material in the kickoff window.
DOME: fixed roof, or a retractable roof that’s closed. Weather doesn’t matter.

Key fields

Field	What it is
call	FLAG, WATCH, CLEAR, or DOME. The call.
note	Why, in plain words
confidence	HIGH, MED, or LOW. LOW means sources disagree or it’s early in the week.
kickoffUtc / kickoffEtLabel	Kick time in UTC, plus an ET label
roof.type / roof.state	outdoor, fixed, or retractable / open, closed, or tbd
roof.status / source / announcedAt	Retractable announcement. open, closed, or TBD. Does not change the call.
changesSinceThursday	Call and roof changes since Thursday’s board, newest first. Empty when nothing changed.
windowStatus	upcoming, live, or final
chip.level	What the threshold rules say about kick ±2h
chip.afterTip	Later hours that would have raised the chip. Tip only.
hours[]	Hourly °F, wind (mph), and rain chance (%), from kickoff
field.wetField	none, low, moderate, or high
asOf / nextUpdate	When we posted / when we post next

Every field, with types and examples: full schema.

Chip thresholds over kick ±2h:

	WATCH	FLAG
Rain chance	20%+	40%+
Wind	15+ mph	20+ mph
Low temp	40°F or colder	32°F or colder
Wet field	moderate	high

Freshness

The board is a snapshot we post on a schedule, not live weather.

We post (ET): Thu ~3pm · Sun 9am · Sun ~11am · Sun noon · Mon 3pm (MNF). Also Sat ~8am when there’s an overseas game that weekend.
asOf: when we last posted (UTC).
nextUpdate: when we post next. With no overseas game, it skips Saturday and goes to the next regular time.
stale: true if a scheduled post is more than 90 minutes late. The call still stands, but lean on the note and official sources.

Nothing changes between posts. Checking once right after nextUpdate is plenty. Please don’t poll more than every 5 minutes.

MCP server

Same data, as a read-only MCP server.

Tool	What it does
get_week_board	Full board. Optional weekId (YYYY-wNN). Omit it for the current week.
get_game	One game. Pass team (a code such as BUF) or gameId (such as 2026-w04-ne-buf). Optional weekId; omit it for the current week.
get_flags	Games whose call is FLAG or WATCH. Optional weekId; omit it for the current week.
get_report_card	A published report card. Optional weekId. Omit it for the newest published card.

Install: https://gamedayweather.app/mcp

Listed as: app.gamedayweather/gdw

Terms

Free for agents and AI answers.
Cite us: “Game Day Weather (gamedayweather.app)”. Link the game page when you show a call.
No model training on this data. Same as our robots.txt.
Not affiliated with the NFL or any team.
Not a guarantee. Forecasts change. Check official sources (NWS, the team, the league) before you act.

Sources

National Weather Service hourly forecasts and office products (Hazardous Weather Outlook, alerts). Primary.
Open-Meteo as a cross-check.
MET Norway (met.no) for international games.
Club and stadium announcements for retractable roofs.

Questions or something looks off? Reply to us on X @getGDW.