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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
I used the API service from openweathermap.org/api . It's free (well some APIs are not, but the one I used is). You just need to create an account and an API key. You get the informations from a json document then I used the ArduinoJSON library (arduinojson.org ) very easy to use, the author created an online assistant to help you generate the code. You can call the data from a city id, a city name or even geographic coordinates. The last one could very cool if you use a GPS module.
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