specification: API Commons Rate Limits
specificationVersion: '0.1'
schema: https://raw.githubusercontent.com/api-evangelist/interface-research/main/schema/api-commons.yml#/$defs/RateLimits
provider: Tomorrow.io
providerId: tomorrow-io
created: '2026-05-24'
modified: '2026-05-24'
reconciled: false
tags:
  - Rate Limiting
  - Quotas
  - Weather
description: Rate-limit policy for the Tomorrow.io v4 API. The Free plan has published per-second, per-hour, and per-day limits. Basic, Professional, and Enterprise plans are quoted by sales; Enterprise additionally receives rate-limit response headers for programmatic monitoring.
sources:
  - https://docs.tomorrow.io/reference/rate-limiting
  - https://support.tomorrow.io/hc/en-us/articles/20273728362644-Free-API-Plan-Rate-Limits
  - https://support.tomorrow.io/hc/en-us/articles/5187600335124-What-is-the-difference-between-rate-limiting-and-concurrent-API-calls
headers:
  limit: x-ratelimit-limit
  remaining: x-ratelimit-remaining
  reset: x-ratelimit-reset
  retryAfter: retry-after
responseCodes:
  throttled: 429
  quotaExceeded: 429
algorithm: leaky-bucket
notes:
  - Each weather field requested in a single call counts as one API call (e.g. a Timelines request for 4 fields counts as 4 calls).
  - The Free plan does not return rate-limit headers; Enterprise responses include them.
  - Per-second limits are enforced first, then per-hour, then per-day.
limits:
  - tier: Free
    rps: 3
    rph: 25
    rpd: 500
    concurrency: 1
  - tier: Basic
    rps: quote
    rph: quote
    rpd: quote
    concurrency: quote
  - tier: Professional
    rps: quote
    rph: quote
    rpd: quote
    concurrency: quote
  - tier: Enterprise
    rps: quote
    rph: quote
    rpd: quote
    concurrency: quote
    headersExposed: true