License & Deployment Mix: 10 tools – 3 OSS, 8 SaaS. (OSS and SaaS counts can overlap when an open-source tool also offers a vendor-hosted edition.)
Note: Data-primary – partial OSS via gov data.
What Are Weather Data Services?
Weather data is a data-primary category. Unlike most tool evaluations where the value is in the software, weather data services derive their value from proprietary sensor networks, numerical weather prediction (NWP) models, and satellite/radar data feeds – infrastructure that costs millions of dollars annually to operate. The APIs and dashboards are simply the delivery mechanism for this data.
OSS is partially viable here. Open-Meteo and Pirate Weather are open-source options, but they rely on government open data (NOAA, ECMWF open data, DWD, Environment Canada) which has lower spatial and temporal resolution than commercial providers. Commercial services like Tomorrow.io and The Weather Company operate proprietary radar networks, satellite constellations, and micro-weather sensor grids that produce higher-resolution data unavailable through government sources.
Weather data services are consumed through:
- REST APIs – real-time current conditions, hourly/daily forecasts, historical data, and severe weather alerts delivered as JSON/GeoJSON
- Map tile layers – radar, satellite, temperature, precipitation, and wind overlays for web/mobile maps
- Webhooks and alerts – severe weather notifications triggered by geofenced conditions
- Bulk data downloads – historical weather archives for analytics, ML training, and compliance
The information on these pages was researched by a combination of human review and large language models. To suggest an addition or correction, please contact us. Prepared by Rhodium Systems Inc., author of the ResorsIT platform — a unified IT operations management platform for IT teams and MSPs that integrates a curated suite of open-source, commercial, and SaaS applications into a single system with shared identity, single sign-on, access control, and a common audit trail. Use this catalogue only as a starting point for your own research, and review any tool carefully against your own requirements before relying on it. Catalogue data version 2026.197.
Comparison
Weather data services are data-primary products – the value is in proprietary sensor networks, NWP models, and forecast data, not the software. Most tools in this category are SaaS-only commercial APIs with no self-hosted option.
Exceptions: Open-Meteo (AGPL-3.0) and Pirate Weather (open source) are self-hostable but rely on government open data with lower resolution than commercial providers. NWS API is a free government service covering US only.
They are integration targets for agriculture, logistics, energy, construction, and insurance.
API keys are the dominant auth mechanism for weather APIs, with SAML available on some enterprise dashboards.
SSO / OIDC Comparison
API key auth dominates weather data services; SSO is relevant only for enterprise dashboards.
| Tool | OIDC | SAML | API Auth | Authentik Notes |
|---|---|---|---|---|
| OpenWeather | No | No | API key | No SSO; proxy auth for dashboard |
| Tomorrow.io | No | Yes* | API key | SAML on enterprise tier |
| AccuWeather | No | No | API key | No SSO; proxy auth for portal |
| Weather Company | No | Yes | API key / OAuth 2.0 | SAML via IBM Cloud IAM |
| Visual Crossing | No | No | API key | No SSO; proxy auth for dashboard |
| Weatherbit | No | No | API key | No SSO; proxy auth for dashboard |
| Open-Meteo | N/A | N/A | None needed | No auth required |
| Climacell | N/A | N/A | N/A (legacy) | Merged into Tomorrow.io |
| NWS API | N/A | N/A | None needed | No auth required |
| Pirate Weather | No | No | API key | Self-hosted; configure as needed |
* = available on enterprise tier only
Best SSO support: Weather Company (SAML via IBM Cloud IAM), Tomorrow.io (SAML on enterprise plans)
No auth needed: Open-Meteo, NWS API (fully open)
API Comparison
| Tool | API Type | Auth | Free Tier | Rate Limit (Free) | Pricing |
|---|---|---|---|---|---|
| OpenWeather | REST | API key | Yes (1,000 calls/day) | 60/min | Free / $0-$180/mo |
| Tomorrow.io | REST | API key | Yes (500 calls/day) | 25/hr | Free / custom enterprise |
| AccuWeather | REST | API key | Yes (50 calls/day) | 50/day | Free / custom enterprise |
| Weather Company | REST | API key / OAuth | No | N/A | Enterprise contract |
| Visual Crossing | REST | API key | Yes (1,000 records/day) | 1,000/day | Free / $35-$250/mo |
| Weatherbit | REST | API key | Yes (limited) | 50 calls/day | Free / $35-$470/mo |
| Open-Meteo | REST | None | Yes (unlimited non-commercial) | 10,000/day | Free / donation |
| Climacell | N/A | N/A | N/A | N/A | Legacy (see Tomorrow.io) |
| NWS API | REST | None | Yes (unlimited) | Reasonable use | Free (government) |
| Pirate Weather | REST | API key | Yes (self-hosted unlimited) | Self-managed | Free (self-hosted) |
Notes:
- OpenWeather’s free tier is the most generous among commercial providers (1,000 calls/day)
- Open-Meteo and NWS API require no API key at all
- AccuWeather’s free tier is very restrictive (50 calls/day) – designed for evaluation only
- Weather Company has no free tier; enterprise contracts start at thousands per month
- Pirate Weather is free when self-hosted; the hosted API has a small free tier
Data Coverage
| Tool | Current | Forecast | Historical | Radar/Satellite | AQI | Global |
|---|---|---|---|---|---|---|
| OpenWeather | Yes | 8-day | 45+ years | Map layers | Yes | Yes |
| Tomorrow.io | Yes | 14-day | 5+ years | Proprietary | Yes | Yes |
| AccuWeather | Yes | 15-day | 30+ years | Map layers | Yes | Yes |
| Weather Company | Yes | 15-day | 10+ years | Proprietary | Yes | Yes |
| Visual Crossing | Yes | 15-day | 50+ years | No | Yes | Yes |
| Weatherbit | Yes | 16-day | 10+ years | No | Yes | Yes |
| Open-Meteo | Yes | 16-day | 80+ years (ERA5) | No | Yes | Yes |
| Climacell | N/A | N/A | N/A | N/A | N/A | Legacy |
| NWS API | Yes | 7-day | Limited | NEXRAD links | No | US only |
| Pirate Weather | Yes | 7-day | No | No | No | US/Canada focus |
Notes:
- Open-Meteo provides the deepest historical data through ERA5 reanalysis (back to 1940)
- Tomorrow.io operates proprietary micro-weather radar and satellite sensors for hyperlocal data
- Weather Company (IBM) has the largest proprietary sensor network via Weather Underground
- NWS API is US-only; other government APIs exist for other countries but are not evaluated here
- Visual Crossing focuses on timeline-based queries combining historical and forecast data seamlessly
Forecast Models & Resolution
| Tool | Models Used | Spatial Resolution | Temporal Resolution |
|---|---|---|---|
| OpenWeather | GFS, ECMWF, proprietary | ~1 km (paid) | Hourly / 3-hourly |
| Tomorrow.io | Proprietary + government | ~500 m (hyperlocal) | Minutely / hourly |
| AccuWeather | Proprietary + government | ~1 km | Minutely (MinuteCast) |
| Weather Company | IBM GRAF, GFS, ECMWF | ~3 km global | Hourly |
| Visual Crossing | Government models | ~10-25 km | Hourly / daily |
| Weatherbit | GFS, ECMWF, proprietary | ~4 km | Hourly / daily |
| Open-Meteo | GFS, ECMWF, ICON, HRRR, JMA | ~1-25 km (model dependent) | Hourly |
| Climacell | N/A | N/A | N/A |
| NWS API | GFS, HRRR, NAM | ~2.5-25 km (model dependent) | Hourly / 6-hourly |
| Pirate Weather | GFS, HRRR, NBM, GEFS | ~2.5-25 km | Hourly |
Notes:
- Tomorrow.io has the highest spatial resolution (~500 m) due to proprietary micro-weather sensors
- Open-Meteo provides access to the widest range of government NWP models through a single API
- AccuWeather’s MinuteCast provides minute-by-minute precipitation forecasts for 2 hours ahead
- Pirate Weather uses the same government models as NWS but presents them in a Dark Sky-compatible API format
Deployment
| Tool | Deployment | Self-Hosted | Compliance |
|---|---|---|---|
| OpenWeather | SaaS | No | SOC 2, GDPR |
| Tomorrow.io | SaaS | No | SOC 2, ISO 27001 |
| AccuWeather | SaaS | No | SOC 2 |
| Weather Company | SaaS / IBM Cloud | No | SOC 2, ISO 27001, FedRAMP |
| Visual Crossing | SaaS | No | GDPR |
| Weatherbit | SaaS | No | GDPR |
| Open-Meteo | SaaS / Self-hosted | Yes (AGPL-3.0) | N/A (open source) |
| Climacell | N/A | N/A | N/A |
| NWS API | Government hosted | No* | US Government |
| Pirate Weather | SaaS / Self-hosted | Yes | N/A (open source) |
* NWS API data is public domain; third parties can mirror and re-serve it.
Self-hosted options: Open-Meteo (AGPL-3.0) can be fully self-hosted with its own data ingestion pipeline. Pirate Weather can be self-hosted but requires significant compute for model processing.
Tools
10 tools.
AccuWeather
AccuWeather is one of the world’s most recognized consumer and enterprise weather brands, founded in 1962 by Dr. Joel N. Myers at Penn State University.
License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: none
Climacell (now Tomorrow.io)
Climacell was a weather technology startup founded in 2016 in Boston, Massachusetts. The company rebranded to Tomorrow.io in 2021 and all Climacell products, APIs, and services have been fully merged into the Tomorrow.io platform.
License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: none
National Weather Service (NWS) API
The National Weather Service (NWS) API is the official programmatic interface to US weather data produced by NOAA (National Oceanic and Atmospheric Administration).
License: LicenseRef-NWS-API (source-available) · Kind: web · Deploy: saas · SSO: none
Open-Meteo
Open-Meteo is an open-source weather API that aggregates data from government weather services worldwide (NOAA, ECMWF, DWD, JMA, BOM, Environment Canada, and others) into a unified, developer- friendly REST API.
License: AGPL-3.0-only (OSS) · Kind: web · Deploy: native, saas · SSO: none
OpenWeather
OpenWeather (formerly OpenWeatherMap) is one of the most popular weather data APIs among developers, offering current conditions, forecasts, historical data, and weather map layers through a simple REST API.
License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: none
Pirate Weather
Pirate Weather is an open-source weather API created as a drop-in replacement for the deprecated Dark Sky API.
License: AGPL-3.0-only (OSS) · Kind: web · Deploy: native, saas · SSO: none
The Weather Company (IBM)
The Weather Company (TWC) is IBM’s weather data division, acquired in 2016. It operates one of the world’s largest weather data platforms, combining **government model data, the Weather Underground citizen science network (~250,000 personal…
License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: OIDC
Tomorrow.io
Tomorrow.io is a hyperlocal weather intelligence platform that differentiates itself through proprietary weather observation infrastructure.
License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: none
Visual Crossing
Visual Crossing is a weather data API focused on making historical and forecast weather data accessible through a timeline-based query model.
License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: none
Weatherbit
Weatherbit is a weather data API provider focused on energy, agriculture, and environmental monitoring use cases.
License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: none
