diff --git a/icclim/main.py b/icclim/main.py
index a92ec938..1e5f98c0 100644
--- a/icclim/main.py
+++ b/icclim/main.py
@@ -21,6 +21,7 @@
 from xarray.core.dataset import Dataset
 
 from icclim.ecad.ecad_indices import EcadIndexRegistry
+from icclim.ecad.xclim_binding import XCLIM_BINDING
 from icclim.generic_indices.generic_indicators import (
     GenericIndicator,
     GenericIndicatorRegistry,
@@ -569,7 +570,17 @@ def _compute_climate_index(
     else:
         result_da = result_da.rename(climate_index.name)
     result_da.attrs[UNITS_KEY] = _get_unit(config.out_unit, result_da)
-    if config.frequency.post_processing is not None and "time" in result_da.dims:
+    if (
+        config.frequency.post_processing is not None
+        and "time" in result_da.dims
+        and not isinstance(
+            climate_index,
+            (
+                XCLIM_BINDING.StandardizedPrecipitationIndex6,
+                XCLIM_BINDING.StandardizedPrecipitationIndex3,
+            ),
+        )
+    ):
         resampled_da, time_bounds = config.frequency.post_processing(result_da)
         result_ds = resampled_da.to_dataset()
         if time_bounds is not None:
diff --git a/icclim/tests/test_input_parsing.py b/icclim/tests/test_input_parsing.py
index 424dcc6f..4a9a66b6 100644
--- a/icclim/tests/test_input_parsing.py
+++ b/icclim/tests/test_input_parsing.py
@@ -108,7 +108,7 @@ def test_read_dataset_xr_ds__simple(self):
         # THEN
         xr.testing.assert_equal(ds_res.pouet, ds.pouet)
 
-    def test_read_dataset_netcdf_success(self):
+    def test_read_dataset__netcdf_success(self):
         # GIVEN
         ds = xr.Dataset({"pouet": self.pr_da})
         ds.to_netcdf(self.OUTPUT_NC_FILE)
@@ -117,7 +117,7 @@ def test_read_dataset_netcdf_success(self):
         # THEN
         xr.testing.assert_equal(ds_res.pouet, ds.pouet)
 
-    def test_read_dataset_multi_netcdf_success(self):
+    def test_read_dataset__multi_netcdf_success(self):
         # GIVEN
         ds = xr.Dataset({"pouet": self.pr_da})
         ds.to_netcdf(self.OUTPUT_NC_FILE)
@@ -128,7 +128,7 @@ def test_read_dataset_multi_netcdf_success(self):
         xr.testing.assert_equal(ds_res.pouet, ds.pouet)
         xr.testing.assert_equal(ds_res.patapouet, ds.pouet)
 
-    def test_read_dataset_zarr_store_success(self):
+    def test_read_dataset__zarr_store_success(self):
         # GIVEN
         ds = xr.Dataset({"pouet": self.pr_da})
         ds.to_zarr(self.OUTPUT_ZARR_STORE)
@@ -137,7 +137,7 @@ def test_read_dataset_zarr_store_success(self):
         # THEN
         xr.testing.assert_equal(ds_res.pouet, ds.pouet)
 
-    def test_read_dataset_not_implemented_error(self):
+    def test_read_dataset__not_implemented_error(self):
         # THEN
         with pytest.raises(NotImplementedError):
             # WHEN
diff --git a/icclim/tests/test_main.py b/icclim/tests/test_main.py
index 3e712087..3ee2e770 100644
--- a/icclim/tests/test_main.py
+++ b/icclim/tests/test_main.py
@@ -400,6 +400,15 @@ def test_indices_all_from_Dataset__seasonal_SPI_error(self):
                 base_period_time_range=("2042-01-01", "2042-12-31"),
             )
 
+    def test_spi6__no_time_bounds(self):
+        dataset = icclim.index(
+            index_name="spi6",
+            in_files=self.full_data,
+            var_name="pr",
+            base_period_time_range=["2042-01-01", "2042-06-01"],
+        ).load()
+        assert "time_bounds" not in dataset.coords
+
     def test_indices_all_from_Dataset__seasonal(self):
         res = icclim.indices(
             index_group="all",