Python time series data bases -

i have hourly temperature data each city in needs kind of statistical , plotting post-processing using grandfathered tools in python. right list has few cities grown include more cities.

each city hourly temperature data 2 column vector. first column being hourly date-time , second column temperature.

what suggested open source database tool can use trying avoid keeping temperature data in csv file.

edit: 10 day hourly temperature forecast each day each city. want store city historical forecast receive vendor every day also.