# xarray.core.accessor_str.StringAccessor.lower

#### StringAccessor.lower()[[source]](https://github.com/pydata/xarray/blob/main/xarray/core/accessor_str.py#L726-L746)

Convert strings in the array to lowercase.

* **Returns:**
  **lowered** (`same type as values`)

### Examples

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```pycon
>>> da = xr.DataArray(["Temperature", "PRESSURE"], dims="x")
>>> da
<xarray.DataArray (x: 2)> Size: 88B
array(['Temperature', 'PRESSURE'], dtype='<U11')
Dimensions without coordinates: x
>>> lowered = da.str.lower()
>>> lowered
<xarray.DataArray (x: 2)> Size: 88B
array(['temperature', 'pressure'], dtype='<U11')
Dimensions without coordinates: x
```

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