Yes, you can usually visit Rohtang Pass during late September and the first week of October. During this period, the snow from the previous winter months has melted, and the road to Rohtang Pass is generally open for tourists. The weather is relatively pleasant with temperatures ranging from 10°C to 15°C (50°F to 59°F) during the day. However, it’s important to keep in mind that weather conditions in the mountains can be unpredictable, and there might be occasional road closures due to landslides or maintenance work. It’s advisable to check the local weather and road conditions before planning your visit.