Getting the temperature right for your cannabis plants is an essential part of each stage of the growing process. If the temperature in your grow room or outdoors is too hot or too cold, your young weed plants will not be able to photosynthesise properly, and this will inevitably affect their growth and development. However, it is not as simple as saying ‘this is the correct temperature; the temperature needs of the plants vary according to their stage of development, so you must have some knowledge of their requirements. To help you, we have written this guide which will explain the best temperature and humidity for growing weed for each phase of your young weed plants.
The last phase of the cannabis growth cycle is the flowering phase. Growers should aim to maintain warm temperatures that are pretty much the same as when the plants were at the seedling stage. Ensure that the temperature stays at a nice warm 20ºC to 25C to prevent buds from burning their terpenes. This will allow your plants to produce deliciously potent flowers.
What you need to know about temperature and humidity
Reducing heat levels in a grow tent can be much harder to control than the reverse. We recommend using electric fans to circulate the air as much as possible to disperse the heat and thus cool the young cannabis plants.
Cultivators should be advised that typical temperature variance when the lights are switched off is 5ºC, and this applies to all the phases of development.
Now, we understand that establishing the ideal temperature for weed plants can be tricky – some say that it is as much instinct as it is science. However, it is certainly possible to work things out for the growing conditions of your plants, and this article will tell you everything you need to know.
At the start of the flowering period, when the ‘stretching’ or the final growth boost occurs, plants need specific climate conditions for this transitional phase.
In order to start growing in the best possible conditions, it is adamant to understand the meaning of this technical term. Relative air humidity levels give us information on the concentration of water vapour in the air.
Here we show you the ideal humidity levels for every growing phase of your cannabis grow.
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Temperatures must be kept between 22-28ºC during the day and 18-22ºC at night. These conditions guarantee the plants’ well-being and facilitate good metabolic function, as well as overall optimum development.
It is essential to maintain the correct relative humidity as cuttings will start to develop their first roots between 12 and 20 days after having been planted in the growing medium. This is a crucial point for the appropriate evolution of these young plants.
They require high moisture levels so they can concentrate all their resources on the development of a strong and vigorous root mass. The correct day temperature should be 25-26ºC, and 21-22ºC at night.
This prevents thermal shock and guarantees that plants will be ready to produce those delicious flowers. It is vital that their well-being is taken care of so they can concentrate all their resources on their final objective: quality and quantity. These measures are valid for the first 3 to 4 weeks of flowering, depending on the strain.