Tomorrow.io is a Boston-based weather intelligence platform combining a global proprietary numerical weather model, a constellation of microsatellite weather radars, and a developer-facing v4 REST API. The platform exposes 60+ hyperlocal data layers — core weather, air quality, pollen, solar, soil, fire, flood, lightning, maritime, aviation, road — together with map tiles, severe-weather event detection, routable forecast queries, climate normals, historical archive access, customer-defined locations, named insights, and threshold-based webhook alerts. Used by airlines, on-demand logistics platforms, agriculture, energy, and the US Air Force, Tomorrow.io's API is designed for ETA-aware route planning, geofenced alerting, agentic workflows, and large-scale operational decisioning under weather risk.
Tomorrow.io publishes 11 API contracts indexed on the APIs.io network, including Historical Weather API, Events API, Weather on Routes API, and 8 more. Tagged areas include Weather, Forecast, Climate, Risk Management, and Air Quality.
The Tomorrow.io catalog on APIs.io includes 1 JSON-LD context and 2 Spectral governance rulesets.
Tomorrow.io’s developer surface includes authentication, developer portal, documentation, API reference, signup flow, developer console, sandbox, and 48 more developer resources.
Regulatory Posture applies to this provider. Its tags matched the
Horizontal (data, software, accessibility, platform) regime, so
Regulatory Posture carries 15 points of the composite.
If this regime is wrong for your business, say so on your
provider repo — the
applicability map is public and we will correct it.
Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it
carries 10 points of the composite. It is scored from the published contracts
themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already
holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in
front of it, and the first time that check is skipped a duplicate record is created.
Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet,
not penalised by it.
The six quality facets above are damped to 75 points between them,
because the conditional facet above carries the other
25. That is why each facet's contribution is shown against a damped
maximum: raising a quality facet moves the composite by 75% of its nominal
weight, not 100%. The full arithmetic is at apis.io/rating/.
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/tomorrow-io: open an issue to ask a question, or submit a pull request to add artifacts.
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Markets this provider is in provisional
The Kin Score Market layer reads a provider inside its market:
its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted:
not part of the Kin Score or agent readiness.
Registered MCP server and declares compatibility are report only — not weighted.
Undeclared means we found nothing we can read, so there is no number: we never infer integrations.
Retrieve historical weather observations and monthly climate normals for any point or polygon on Earth using the same field catalog as the realtime and forecast APIs.
Retrieve weather along an arbitrary polyline of waypoints at the times each segment is expected to be traversed — powers route optimization, logistics planning, and ETA-aware ha...
Manage saved locations (points, polygons, lines) referenced by ``locationId`` across the Tomorrow.io APIs, with tag-based cohorts for fleet, customer, or asset organization.
Create and manage threshold-based weather alerts that evaluate Tomorrow.io data layers against custom rules for linked locations and deliver notifications via webhook, email, an...
Define and manage reusable Insights — named rules combining Tomorrow.io data layers, operators, and thresholds — that power the Events and Alerts APIs.
Core weather, air quality, pollen, solar, soil, fire, flood, lightning, maritime, aviation, and road layers retrievable at point, polygon, or polyline geometry.
Tomorrow.io operates its own constellation of space-based weather radars to fill gaps in terrestrial radar coverage, especially over oceans and the developing world.
Minutely Forecast Resolution
60-minute minute-by-minute precipitation forecast in addition to hourly and daily timelines (Enterprise tier).
14-Day Forecast Horizon
Daily forecast out to 14 days on Enterprise plans, 5 days on Free.
Climate Normals
Monthly long-term averages for benchmarking current conditions against typical patterns.
Severe Weather and Custom Events
First-class API for severe weather phenomena plus customer-defined vector events for proprietary hazard models.
Threshold Alerts with Webhooks
Define rule-based alerts that fire webhooks and emails when conditions cross thresholds for linked locations.
Weather Map Tiles
Web Mercator PNG tiles for visualizing every data layer in Mapbox, MapLibre, Leaflet, OpenLayers, Google Maps.
Weather on Routes
ETA-aware weather retrieval along a polyline of waypoints for logistics, aviation, and maritime planning.
MCP Server
Official Tomorrow.io Model Context Protocol server for agentic AI access to the Weather API.
99.9% Uptime SLA
Enterprise SLA with rate-limit response headers exposed for programmatic monitoring.
LLMs.txt Indexed Documentation
Tomorrow.io publishes an LLMs.txt index of every documentation page and endpoint for AI agents.
Self-serve developer API with 60+ data layers, Postman collection, and MCP server.
Tomorrow.io Resilience Platform
Operational dashboards, alerts, and decision automation built on top of the Tomorrow.io Weather API.
Aviation Resilience
Vertical solution for airline operations centers, dispatch, and aerodrome operations.
Energy Resilience
Vertical solution for utility load forecasting, generation forecasting, and outage management.
Logistics Resilience
Vertical solution for fleet, freight, and last-mile delivery routing under weather risk.
Government and Defense
Tomorrow.io serves the US Air Force and other defense and government customers with operational weather intelligence and proprietary space-based weather radar.
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