Glad to hear from you. For 4 to 5 days at begging it will be hot during the day, it will be about 25 to 30 degrees Celsius. And at the highest point in Larkya pass (5,160 m) will be 10 to 15 degrees Celsius during daytime and night and early morning will be 0 to -10 degrees Celsius outside. But it will depend on the following day's weather condition too. Normally, during this time weather is perfect. But the high Himalayan weather condition is unpredictable. It might be rain or snow at any time. Let’s, thing good then everything goes perfect. If you have the -6°C sleeping bag, it is good enough, if you feel not enough every tea house provides a blanket as well.