I have a model WS-8115U clock weather station. I put new batteries in the outside weather module and the unit is not registering the temp.

SOURCE: Outside unit not registering temp and humidity to base unit

Uniden EWCI936
To get the outside temperature working again, open the outdoor sensor box carefully loosening the one screw with a screwdriver, insert 3 brand new AA batteries, check phone for outside temperature. If not showing on the phone display, try changing the 'channel' setting, just above the batteries. Be careful not to break the tiny switch. Gently use a smaller flathead screwdriver, if needed. There are 3 settings. Mine worked fine on the first setting. If it is showing on the phone set screens, then, carefully screw the lid back on to the sensor box, and re-insert into the sensor wall holder. I keep mine in a plastic bag on a shelf outside, away from sun, so I can get a true reading day or night. It is always a bit warmer in the sunlight than the true outdoor air temperature. Enjoy

SOURCE: Sharp Weather Station Model SPC344 The outside

After inserting the batteries, DO NOT set the time until the OUTSIDE temperature registers. That's the trick.

SOURCE: Ultronic clock. weather station, where does it get the temp

There must be an outside sensor somewhere, usually a small white plastic box, some have a display, some don't.