The WeatherLink v2 API uses an API Key, an API Secret, a request timestamp, and a calculated API Signature for authenticating API requests.


The API Key is a unique ID that identifies the API user making the API call. The API Key must be passed as a query parameter in all API requests.

The API Key is passed in the API request as a query parameter named api-key.

API Secret

The API Secret is a secret value that is used to calculate a signature for each API request.

The API Secret must be protected and must never be passed as a parameter to the API.

If your API Secret is compromised it will allow others to access the API while pretending to be you. If this occurs please go back to the Account page at and click the Generate v2 Key button again. This will delete the old API Secret and create a new API Secret. You will then need to update your code to use the new API Secret.

Please note that the API Key will not be changed and can not be deleted when generating a new API Secret.

API Request Timestamp

The API request timestamp is the Unix timestamp at the time the API request is being generated. The purpose of the timestamp is to prevent request replay attacks.

Every request to the WeatherLink v2 API must use the current Unix timestamp and the API signature must be recomputed to account for the new timestamp on each request.

To allow for variations in clocks between your computer and our servers we allow a several minute window for the use of a specific Unix timestamp. In general it is a best practice to just retrieve the current Unix timestamp for each API call.

The API Request Timestamp is passed in the API request as a query parameter named t.

API Signature

The API Signature is a calculated value used to prevent API request parameter tampering. The API Signature process takes all of the request parameters and the API Secret and computes a fingerprint-like value that represents the request. If someone else intercepts the request parameters and attempts to alter them the API Signature will no longer match and the API servers will reject the altered request.

Every request to the WeatherLink v2 API must calculate a new signature for the parameters being sent in the API call. If a single parameter changes between API calls then you must compute a new API signature.

The API Signature is passed in the API request as a query parameter named api-signature.

Live Code Examples

We have created some API Signature Calculation live code examples similar to Example #1 below. The live code sample is available in different programming languages.

Walkthrough Examples

Please Note:

The old Walkthrough Examples have been replaced by the new Tutorial documentation page.