Frequently Asked Questions

Common fixes to common errors reported by the Community

AttributeError: ‘OWM25’ object has no attribute ‘xxx’

Your code looks like:

>>> from pyowm import OWM
>>> owm = OWM('your-api-key-here')
>>> mgr = owm.weather_manager()

AttributeError: 'OWM25' object has no attribute 'weather_manager'

This happens because you are not running PyOWM v3 and this is because your code is currently based on an old Python 2 setup Python 2 is officially dead and should be removed in favor of Python 3.

What you should do is:

  • install Python 3.6+
  • install PyOWM v3+ with pip3 install pyowm

The above snippet should just work fine then.

Remember to port the rest of your code to Python 3: everything related to PyOWM v2 can be ported using this guide

UnauthorizedError: Invalid API Key provided

You are able to successfully create an OWM object and calling functions other than One-Call related ones (eg. getting observed or forecasted weather)

As stated in the documentation home page, OpenWeatherMap API recently “blocked” calls towards a few legacy API endpoints whenever requested by clients using non-recent free API keys.

This means that PyOWM might return authorization errors in that case.

This behaviour is not showing if you use API keys issued time ago - unfortunately I have no way to be more precise as OWM never stated this officially.

The proper way to obtain the data you are looking for is to call the “OneCall” PyOWM methods using your API key

So please refer to the documentation for this

I cannot use PyOWM 3 so I need to use PyOWM version 2.10

This may happen if you still use Python 2 or you use Python 3 but with a minor version that is not supported by PyOWM

Please install PyOWM 2.10 with:

pip2 install pyowm==2.10 

And find the PyOWM 2.10 documentation here

ModuleNotFound error upon installing PyOWM development branch from Github

Installation of the (potentially unstable) development trunk used to be like this:

$ pip install git+

You would get something like:

Collecting git+
  Cloning (to revision develop) to /tmp/pip-req-build-_86bl7ty
    ERROR: Command errored out with exit status 1:
     command: /home/me/.local/share/virtualenvs/backend-nPPHZqlJ/bin/python -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-req-build-_86bl7ty/'"'"'; __file__='"'"'/tmp/pip-req-build-_86bl7ty/'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);'"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /tmp/pip-pip-egg-info-ww_gs9y3
         cwd: /tmp/pip-req-build-_86bl7ty/
    Complete output (17 lines):
    Traceback (most recent call last):
      File "/tmp/pip-req-build-_86bl7ty/pyowm/commons/", line 6, in <module>
        from pyowm.utils.geo import Polygon
      File "/tmp/pip-req-build-_86bl7ty/pyowm/utils/", line 4, in <module>
        import geojson
    ModuleNotFoundError: No module named 'geojson'
ERROR: Command errored out with exit status 1: python egg_info Check the logs for full command output.

I’ve realized this way of installing is bad as it does not install PyOWM’s dependencies* along. Therefore the right way to go is:

$ git clone
$ cd pyowm && git checkout develop
$ pip install -r requirements.txt && python install