The best time to visit this solitary yet impressive region of Himachal Pradesh is during the summers from May to October. It is the barely time when the roads reside clear of ice. In the winter season, Lahaul & Spiti fluff under the heavy sheet of snow.  

Lahaul & Spiti in Summer Season (May-June)

 Temperature varying between 8°C and 15°C, this is the favorable time to visit Lahaul and Spiti Valley. The temperature resides cool and relatively cold during this period approving many outdoor and trekking activities. With the roads bringing cleared off snow and clear atmospheres, this is an excellent period to explore the cold deserts of Spiti and the lush vegetation of Lahaul.

• Spiti Valley in May maximum(15 degrees celsius), minimum(1-degree Celsius). The definite temperature may go further up or low depending on the weather conditions.
• Spiti Valley in June maximum(10 degrees celsius), minimum(-2 degrees Celsius). Spiti remains approachable by road throughout the year and tourists travel here for all 12 months. Spiti Valley in June will be pleasant enough to travel. 

Lahaul & Spiti in Monsoon Season (July-September)​

 Lahaul and Spiti decline in the rain shadow area of the Himalayas and thus, experience little to no rain during these months. Lahaul and Spiti are some of the favorite destinations to visit during the monsoons, the streets directing to these regions, mainly through Kinnaur and Manali, serve extremely apt to landslides.

Spiti Valley in July maximum(14 degrees celsius), minimum(5 degrees celsius). The weather of Spiti Valley in July is pretty pleasant. On days it will be a little bit warm and at night it will be cold. 

Spiti Valley in August maximum(15 degrees celsius), minimum(4 degrees celsius). In August, Spiti Valley is less crowded and it is more enjoyable to travel during this month. 

Spiti Valley in September maximum(15 degrees celsius), minimum(3 degrees celsius). At the end of September month, there will be a chance of having snowfall, so If you are planning to visit then it is a must to carry some woolen clothes. 

Lahaul & Spiti in Winter Season (November-April)

This area experiences exceedingly cold and intense winters, with the temperature plunging to as low as -17°C and even downward in some villages of Spiti. However, for winter enthusiasts and snow enthusiasts, Lahaul and Spiti is an impressive destination during this period of the year.

• Spiti Valley in October maximum(6 degrees celsius), minimum(-6 degree Celsius). Tourists who wish to travel to Spiti Valley in October have to take the route of Srinagar and Kargil.
• Spiti Valley in November maximum(-1 degree Celsius), minimum(-12 degree celsius). If you want to enjoy snowfall then it is the ideal month to travel to Spiti Valley. 
• Spiti Valley in December maximum(-7 degree Celsius), minimum(-19 degree celsius). If you are interested to enjoy the local life of Spiti Valley then you must visit in December. 
• Spiti valley in January maximum(-9 degree Celsius), minimum(-20 degree celsius). During January, it is extremely cold and heavy snowfall. 
• Spiti Valley in February maximum(-6 degree Celsius), minimum(-19 degree celsius). With a high level of feet of snow all around, it turns into a fantastic white color that will make you dazzled and wishing to stay for more time.
• Spiti Valley in March maximum(-3 degree Celsius), minimum(-15 degree celsius). In March, some of the roads are closed due to snowfall. 
• Spiti Valley in April maximum(8 degrees celsius), minimum(-7 degree Celsius). The weather this month will not be extremely hot but it will still be cold enough. At night it will be pleasantly cold and at night it will get harsh and cold.