diff --git a/odoo/addons/test_read_group/tests/test_fill_temporal.py b/odoo/addons/test_read_group/tests/test_fill_temporal.py
index 6f178f0190f..07dcb0ed19b 100644
--- a/odoo/addons/test_read_group/tests/test_fill_temporal.py
+++ b/odoo/addons/test_read_group/tests/test_fill_temporal.py
@@ -777,6 +777,66 @@ class TestFillTemporal(common.TransactionCase):
 
         self.assertEqual(groups, expected)
 
+    def test_with_bounds_groupby_week(self):
+        """Test data with weeks starting on Sunday and forced boundaries."""
+        self.Model.create([
+            {'date': '1916-08-19', 'value': 4},   # saturday W34
+            {'date': '1916-08-20', 'value': 13},  # sunday   W35
+            {'date': '1916-09-10', 'value': 5},   # sunday   W38
+            {'date': '1916-08-18', 'value': 3},   # friday   W34
+            {'date': '1916-09-11', 'value': 4},   # monday   W38
+            {'date': '1916-09-12', 'value': 11},  # tuesday  W38
+        ])
+
+        expected = [{
+            '__domain': ['&', ('date', '>=', '1916-08-06'), ('date', '<', '1916-08-13')],
+            '__range': {'date:week': {'from': '1916-08-06', 'to': '1916-08-13'}},
+            'date:week': 'W33 1916',
+            'date_count': 0,
+            'value': 0,
+        }, {
+            '__domain': ['&', ('date', '>=', '1916-08-13'), ('date', '<', '1916-08-20')],
+            '__range': {'date:week': {'from': '1916-08-13', 'to': '1916-08-20'}},
+            'date:week': 'W34 1916',
+            'date_count': 2,
+            'value': 7,
+        }, {
+            '__domain': ['&', ('date', '>=', '1916-08-20'), ('date', '<', '1916-08-27')],
+            '__range': {'date:week': {'from': '1916-08-20', 'to': '1916-08-27'}},
+            'date:week': 'W35 1916',
+            'date_count': 1,
+            'value': 13,
+        }, {
+            '__domain': ['&', ('date', '>=', '1916-08-27'), ('date', '<', '1916-09-03')],
+            '__range': {'date:week': {'from': '1916-08-27', 'to': '1916-09-03'}},
+            'date:week': 'W36 1916',
+            'date_count': 0,
+            'value': 0,
+        }, {
+            '__domain': ['&', ('date', '>=', '1916-09-03'), ('date', '<', '1916-09-10')],
+            '__range': {'date:week': {'from': '1916-09-03', 'to': '1916-09-10'}},
+            'date:week': 'W37 1916',
+            'date_count': 0,
+            'value': 0,
+        }, {
+            '__domain': ['&', ('date', '>=', '1916-09-10'), ('date', '<', '1916-09-17')],
+            '__range': {'date:week': {'from': '1916-09-10', 'to': '1916-09-17'}},
+            'date:week': 'W38 1916',
+            'date_count': 3,
+            'value': 20,
+        }, {
+            '__domain': ['&', ('date', '>=', '1916-09-17'), ('date', '<', '1916-09-24')],
+            '__range': {'date:week': {'from': '1916-09-17', 'to': '1916-09-24'}},
+            'date:week': 'W39 1916',
+            'date_count': 0,
+            'value': 0,
+        }]
+
+        model_fill = self.Model.with_context(fill_temporal={"fill_from": '1916-08-10', "fill_to": '1916-09-20'})
+        groups = model_fill.read_group([], fields=['date', 'value'], groupby=['date:week'])
+
+        self.assertEqual(groups, expected)
+
     def test_upper_bound(self):
         """Test the alternative dictionary format for the fill_temporal context key (fill_to).
 
diff --git a/odoo/models.py b/odoo/models.py
index 633b81307c7..c5c0a5cb095 100644
--- a/odoo/models.py
+++ b/odoo/models.py
@@ -2349,6 +2349,12 @@ class BaseModel(metaclass=MetaModel):
             return data
 
         granularity = first_group.split(':')[1] if ':' in first_group else 'month'
+        days_offset = 0
+        if granularity == 'week':
+            # _read_group_process_groupby week groups are dependent on the
+            # locale, so filled groups should be too to avoid overlaps.
+            first_week_day = int(get_lang(self.env).week_start) - 1
+            days_offset = first_week_day and 7 - first_week_day
         interval = READ_GROUP_TIME_GRANULARITY[granularity]
         tz = False
         if field.type == 'datetime' and self._context.get('tz') in pytz.all_timezones_set:
@@ -2362,14 +2368,14 @@ class BaseModel(metaclass=MetaModel):
         existing_from, existing_to = existing[0], existing[-1]
         if fill_from:
             fill_from = odoo.fields.Datetime.to_datetime(fill_from) if isinstance(fill_from, datetime.datetime) else odoo.fields.Date.to_date(fill_from)
-            fill_from = date_utils.start_of(fill_from, granularity)
+            fill_from = date_utils.start_of(fill_from, granularity) - datetime.timedelta(days=days_offset)
             if tz:
                 fill_from = tz.localize(fill_from)
         elif existing_from:
             fill_from = existing_from
         if fill_to:
             fill_to = odoo.fields.Datetime.to_datetime(fill_to) if isinstance(fill_to, datetime.datetime) else odoo.fields.Date.to_date(fill_to)
-            fill_to = date_utils.start_of(fill_to, granularity)
+            fill_to = date_utils.start_of(fill_to, granularity) - datetime.timedelta(days=days_offset)
             if tz:
                 fill_to = tz.localize(fill_to)
         elif existing_to: