diff --git a/posthog/temporal/batch_exports/s3_batch_export.py b/posthog/temporal/batch_exports/s3_batch_export.py
index ffac89ea98d53..8a1f3910746c9 100644
--- a/posthog/temporal/batch_exports/s3_batch_export.py
+++ b/posthog/temporal/batch_exports/s3_batch_export.py
@@ -51,9 +51,7 @@
     BatchExportTemporaryFile,
     WriterFormat,
 )
-from posthog.temporal.batch_exports.utils import (
-    set_status_to_running_task,
-)
+from posthog.temporal.batch_exports.utils import set_status_to_running_task
 from posthog.temporal.common.clickhouse import get_client
 from posthog.temporal.common.heartbeat import Heartbeater
 from posthog.temporal.common.logger import bind_temporal_worker_logger
@@ -73,6 +71,8 @@
     "InvalidS3Key",
     # All consumers failed with non-retryable errors.
     "RecordBatchConsumerNonRetryableExceptionGroup",
+    # Invalid S3 endpoint URL
+    "InvalidS3EndpointError",
 ]
 
 FILE_FORMAT_EXTENSIONS = {
@@ -166,6 +166,13 @@ def __init__(self):
         super().__init__("Endpoint URL cannot be empty.")
 
 
+class InvalidS3EndpointError(Exception):
+    """Exception raised when an S3 endpoint is invalid."""
+
+    def __init__(self, message: str = "Endpoint URL is invalid."):
+        super().__init__(message)
+
+
 Part = dict[str, str | int]
 
 
@@ -240,14 +247,19 @@ def is_upload_in_progress(self) -> bool:
     async def s3_client(self):
         """Asynchronously yield an S3 client."""
 
-        async with self._session.client(
-            "s3",
-            region_name=self.region_name,
-            aws_access_key_id=self.aws_access_key_id,
-            aws_secret_access_key=self.aws_secret_access_key,
-            endpoint_url=self.endpoint_url,
-        ) as client:
-            yield client
+        try:
+            async with self._session.client(
+                "s3",
+                region_name=self.region_name,
+                aws_access_key_id=self.aws_access_key_id,
+                aws_secret_access_key=self.aws_secret_access_key,
+                endpoint_url=self.endpoint_url,
+            ) as client:
+                yield client
+        except ValueError as err:
+            if "Invalid endpoint" in str(err):
+                raise InvalidS3EndpointError(str(err)) from err
+            raise
 
     async def start(self) -> str:
         """Start this S3MultiPartUpload."""
diff --git a/posthog/temporal/tests/batch_exports/test_s3_batch_export_workflow.py b/posthog/temporal/tests/batch_exports/test_s3_batch_export_workflow.py
index dc0de17e53d58..76a3c20599518 100644
--- a/posthog/temporal/tests/batch_exports/test_s3_batch_export_workflow.py
+++ b/posthog/temporal/tests/batch_exports/test_s3_batch_export_workflow.py
@@ -29,6 +29,7 @@
 from posthog.temporal.batch_exports.s3_batch_export import (
     FILE_FORMAT_EXTENSIONS,
     IntermittentUploadPartTimeoutError,
+    InvalidS3EndpointError,
     S3BatchExportInputs,
     S3BatchExportWorkflow,
     S3HeartbeatDetails,
@@ -40,9 +41,7 @@
 )
 from posthog.temporal.common.clickhouse import ClickHouseClient
 from posthog.temporal.tests.batch_exports.utils import mocked_start_batch_export_run
-from posthog.temporal.tests.utils.events import (
-    generate_test_events_in_clickhouse,
-)
+from posthog.temporal.tests.utils.events import generate_test_events_in_clickhouse
 from posthog.temporal.tests.utils.models import (
     acreate_batch_export,
     adelete_batch_export,
@@ -1576,6 +1575,23 @@ async def client(self, *args, **kwargs):
         await s3_upload.upload_part(io.BytesIO(b"1010"), rewind=False)  # type: ignore
 
 
+async def test_s3_multi_part_upload_raises_exception_if_invalid_endpoint(bucket_name, s3_key_prefix):
+    """Test a InvalidS3EndpointError is raised if the endpoint is invalid."""
+    s3_upload = S3MultiPartUpload(
+        bucket_name=bucket_name,
+        key=s3_key_prefix,
+        encryption=None,
+        kms_key_id=None,
+        region_name="us-east-1",
+        aws_access_key_id="object_storage_root_user",
+        aws_secret_access_key="object_storage_root_password",
+        endpoint_url="some-invalid-endpoint",
+    )
+
+    with pytest.raises(InvalidS3EndpointError):
+        await s3_upload.start()
+
+
 @pytest.mark.parametrize("model", [TEST_S3_MODELS[1], TEST_S3_MODELS[2], None])
 async def test_s3_export_workflow_with_request_timeouts(
     clickhouse_client,