You need to always also check the FAQ and wiki for further information.

>From the FAQ:


if you installed WeeWX using a DEB/RPM package, then the configuration 
files, skins, and database are owned by the user weewx. If you are not in 
the weewx group, you will not be able to modify those files, although you 
*should* be able to read them. If you need to edit the files or database, 
put yourself into the weewx group:
sudo usermod -aG weewx your-user-name

See the Wiki article understanding permissions 
<https://github.com/weewx/weewx/wiki/Understanding-permissions>.

Which points 
to https://github.com/weewx/weewx/wiki/Understanding-permissions and 
specifically 
https://github.com/weewx/weewx/wiki/Understanding-permissions#more-details-about-which-groups-can-do-what
 
which points you right to the answer.  So it's been documented in the FAQ 
'and' wiki for years.


On Friday, August 15, 2025 at 9:48:11 AM UTC-7 Judge Richter wrote:

> Got it. I have to do 'sudo usermod -aG i2c weewx'. I think such 
> information should be find in the weewx user guide.
>
> https://www.mail-archive.com/[email protected]/msg47195.html 
> <https://www.mail-archive.com/[email protected]/msg47195.html>
>
> Judge Richter schrieb am Freitag, 15. August 2025 um 15:55:00 UTC+2:
>
>>
>> Edit to my last answer: it works NOW, it could install the driver. But i 
>> dont See anything in the Webinterface.
>> Judge Richter schrieb am Freitag, 15. August 2025 um 15:14:47 UTC+2:
>>
>>> OK, works not. I had to reboot after adding the user to the group.
>>>
>>> But weewx doesn't recognize the sensor. In the webinterface inside temp 
>>> is 17° but acually it's 26°. I have this in syslog
>>>
>>>
>>> *Aug 15 15:09:50 weather weewxd[608]: CRITICAL __main__:     ****   
>>>  File "/etc/weewx/bin/user/bme280wx.py", line 58, in __init__Aug 15 
>>> 15:10:00 weather weewxd.py[608]: bme280: bme280wx configuration 
>>> {'i2c_port': '1', 'i2c_address': '0x76', 'usUnits': 'US', 
>>> 'temperatureKeys': 'inTemp', 'temperature_must_have': '', 'pressureKeys': 
>>> 'pressure', 'pressure_must_have': 'outTemp', 'humidityKeys': 'inHumidity', 
>>> 'humidity_must_have': ''}*
>>>
>>> Your driver is for *waveshare* bme280 but I thought it's from bosch. Is 
>>> it possible we are talking about different sensors?
>>>
>>> vince schrieb am Donnerstag, 14. August 2025 um 19:35:21 UTC+2:
>>>
>>>> Add your user (typically pi) to group weewx so it has permission to 
>>>> write the config files in /etc/weewx which is group weewx.
>>>>
>>>>    - sudo usermod -aG weewx pi
>>>>    - then log out as user pi, and log back in to make it take effect
>>>>    - then try the extension install which should work fine 'without' 
>>>>    sudo
>>>>
>>>> (I had a spare pi to test on and the above worked for me just now)
>>>>
>>>> Once the initial weewx package is installed you shouldn't need to use 
>>>> sudo at all, nor should you.  Weewx v5 does not run as root.  A dpkg 
>>>> installation runs as user 'weewx' group 'weewx'.  You can check your group 
>>>> membership via the 'groups' command which should return output that looks 
>>>> something like:
>>>>
>>>> pi@raspberrypi:~ $ groups
>>>> pi adm dialout cdrom sudo audio video plugdev games users input render 
>>>> netdev lpadmin weewx gpio i2c spi
>>>>
>>>> On Thursday, August 14, 2025 at 10:06:36 AM UTC-7 Judge Richter wrote:
>>>>
>>>>> now i have an other error
>>>>>
>>>>>
>>>>> *weectl extension install -y       
>>>>>  
>>>>> https://gitlab.com/wjcarpenter/bme280wx/-/archive/master/bme280wx-master.zip
>>>>>  
>>>>> <https://gitlab.com/wjcarpenter/bme280wx/-/archive/master/bme280wx-master.zip>Error
>>>>>  
>>>>> parsing config file: [Errno 13] Permission denied: 
>>>>> '/etc/weewx/weewx.conf'*
>>>>>
>>>>>
>>>>> *Traceback (most recent call last):*
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> *  File "/usr/share/weewx/weeutil/startup.py", line 86, in start_app  
>>>>>   config_path, config_dict = weecfg.read_config(config_option, 
>>>>> [config_arg])                              
>>>>>  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  File 
>>>>> "/usr/share/weewx/weecfg/__init__.py", line 150, in read_config    
>>>>> config_dict = configobj.ConfigObj(config_path,                  
>>>>> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  File 
>>>>> "/usr/lib/python3/dist-packages/configobj/__init__.py", line 1229, in 
>>>>> __init__    self._load(infile, configspec)  File 
>>>>> "/usr/lib/python3/dist-packages/configobj/__init__.py", line 1236, in 
>>>>> _load    with open(infile, 'rb') as h:        
>>>>>  ^^^^^^^^^^^^^^^^^^PermissionError: [Errno 13] Permission denied: 
>>>>> '/etc/weewx/weewx.conf'*
>>>>>
>>>>> and when i run weectl with sudo
>>>>>
>>>>>
>>>>>
>>>>> *Using configuration file /etc/weewx/weewx.confTraceback (most recent 
>>>>> call last):*
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> *  File "/usr/share/weewx/weectl.py", line 75, in <module>    main()  
>>>>> File "/usr/share/weewx/weectl.py", line 67, in main    
>>>>> namespace.func(namespace)  File "/usr/share/weewx/weectllib/__init__.py", 
>>>>> line 80, in dispatch    config_path, config_dict, log = 
>>>>> weeutil.startup.start_app('weectl',                                    
>>>>> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  File 
>>>>> "/usr/share/weewx/weeutil/startup.py", line 111, in start_app    
>>>>> weewx_root, user_module = initialize(config_dict)                         
>>>>>  
>>>>>     ^^^^^^^^^^^^^^^^^^^^^^^  File "/usr/share/weewx/weeutil/startup.py", 
>>>>> line 76, in initialize    importlib.import_module('user.extensions')*
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> *  File "/usr/lib/python3.11/importlib/__init__.py", line 126, in 
>>>>> import_module    return _bootstrap._gcd_import(name[level:], package, 
>>>>> level)           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  
>>>>> File 
>>>>> "<frozen importlib._bootstrap>", line 1206, in _gcd_import  File "<frozen 
>>>>> importlib._bootstrap>", line 1178, in _find_and_load  File "<frozen 
>>>>> importlib._bootstrap>", line 1149, in _find_and_load_unlocked  File 
>>>>> "<frozen importlib._bootstrap>", line 690, in _load_unlocked  File 
>>>>> "<frozen 
>>>>> importlib._bootstrap_external>", line 940, in exec_module  File "<frozen 
>>>>> importlib._bootstrap>", line 241, in _call_with_frames_removed*
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> *  File "/etc/weewx/bin/user/extensions.py", line 18, in <module>    
>>>>> locale.setlocale(locale.LC_ALL, '')  File 
>>>>> "/usr/lib/python3.11/locale.py", 
>>>>> line 626, in setlocale    return _setlocale(category, locale)          
>>>>>  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^locale.Error: unsupported locale setting*
>>>>>
>>>>> I have installed weewx using apt 
>>>>> https://weewx.com/docs/5.1/quickstarts/debian/#install
>>>>> vince schrieb am Donnerstag, 14. August 2025 um 18:12:24 UTC+2:
>>>>>
>>>>>> sudo apt install python3-bme280
>>>>>>
>>>>>> On Thursday, August 14, 2025 at 8:21:38 AM UTC-7 Judge Richter wrote:
>>>>>>
>>>>>>> Installation of bme280 works but the weewx start failed:
>>>>>>>
>>>>>>> I can read the data from bme280 manually with a python script.
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> *Using configuration file /etc/weewx/weewx.confExtension Name   
>>>>>>>  Version   Descriptionbme280wx          1.0       Add bme280 sensor 
>>>>>>> readings to loop packet datapi@weather:~$ sudo nano 
>>>>>>> /etc/weewx/weewx.confpi@weather:~$ weewxd Using configuration file 
>>>>>>> /etc/weewx/weewx.confTraceback (most recent call last):  File 
>>>>>>> "/usr/share/weewx/weewxd.py", line 226, in <module>    main()  File 
>>>>>>> "/usr/share/weewx/weewxd.py", line 121, in main    engine = 
>>>>>>> weewx.engine.StdEngine(config_dict)            
>>>>>>>  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  File 
>>>>>>> "/usr/share/weewx/weewx/engine.py", line 89, in __init__    
>>>>>>> self.loadServices(config_dict)  File 
>>>>>>> "/usr/share/weewx/weewx/engine.py", 
>>>>>>> line 157, in loadServices    obj = 
>>>>>>> weeutil.weeutil.get_object(svc)(self, 
>>>>>>> config_dict)          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  File 
>>>>>>> "/usr/share/weewx/weeutil/weeutil.py", line 1404, in get_object    
>>>>>>> module = 
>>>>>>> importlib.import_module(module_name)            
>>>>>>>  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  File 
>>>>>>> "/usr/lib/python3.11/importlib/__init__.py", line 126, in import_module 
>>>>>>>    
>>>>>>> return _bootstrap._gcd_import(name[level:], package, level)          
>>>>>>>  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  File "<frozen 
>>>>>>> importlib._bootstrap>", line 1206, in _gcd_import  File "<frozen 
>>>>>>> importlib._bootstrap>", line 1178, in _find_and_load  File "<frozen 
>>>>>>> importlib._bootstrap>", line 1149, in _find_and_load_unlocked  File 
>>>>>>> "<frozen importlib._bootstrap>", line 690, in _load_unlocked  File 
>>>>>>> "<frozen 
>>>>>>> importlib._bootstrap_external>", line 940, in exec_module  File 
>>>>>>> "<frozen 
>>>>>>> importlib._bootstrap>", line 241, in _call_with_frames_removed  File 
>>>>>>> "/etc/weewx/bin/user/bme280wx.py", line 6, in <module>    import 
>>>>>>> bme280ModuleNotFoundError: No module named 'bme280'*
>>>>>>>
>>>>>>

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