What is the perfect environment for growing plants and producing high-quality cannabis? When growing cannabis, temperature can be manipulated for optimal results.

Optimal indoor temperatures are crucial for a thriving cannabis crop. The best conditions will enhance both potency and yield.

This guide will explain how temperature affects your cannabis and how you can control it.

Optimal Temperatures For Growing Cannabis Indoors

Cannabis plants can thrive in various environments and still yield high-quality yields. However, when growing cannabis indoors, it is crucial to provide optimal conditions to compensate for the absence of natural sunlight, which is essential for the plant’s health.

Although lighting solutions can simulate natural sunlight, indoor cannabis plants often end up being less hardy than their outdoor counterparts.

With that in mind, utilizing temperature control to help your indoor plants thrive is imperative for indoor marijuana success.

Seedling Stage

Seedlings are delicate and require a stable, warm environment to encourage healthy root development and early growth.

Ideal temperature:

• Day temperature (lights on): 70-75° (21-24°C)
• Night temperature (lights off): 60-65° (16-18°C)

Vegetative Stage

The ideal temperature for a cannabis indoor grow during the vegetative stage is 70-85°F. This range is optimal as it promotes efficient photosynthesis and robust plant growth.

Varied temperatures that are too high or low will lower the rate of photosynthesis, and the growth rate of the plant itself.

Cooler night temperatures help mimic natural outdoor conditions.

When the lights are off, it’s best to have a temperature that is around 10° lower than the daytime temperature. So if you keep your grow room at 75° when the lights are on, aim for 65° when they are off.

Ideal Temperature:

• Day temperature (lights on): 70-85°F (21-29°C)
• Night temperature (lights off): 60-75°F (16-24°C)

Flowering Stage

In outdoor growing operations, cannabis plants flower in the Autumn when temperatures start to drop.

This ideal flowering temperature is somewhere around 65-80°F. The same 10° differential from light and dark is optimal as well, just as when in a vegetative stage.

This flowering temperature allows terpene and cannabinoid maturation. Too high temperatures can degrade sensitive terpenes, which will affect the flavor, aroma, and high of cannabis.

Manipulating your grow room temperature for flowering can also bring out purple, blue, and pink colors in the buds themselves when the temperature is low enough.

Ideal Temperature:

• Day temperature (lights on): 65-80°F (18-26°C)
• Night temperature (lights off): 55-70°F (13-21°C)

Late Flowering Stage

In the final weeks of the flowering stage, maintaining cooler temperatures can enhance color expression in the buds and further boost resin production.

Ideal Temperature:

• Day temperature (lights on): 65-75°F (18-24°C)
• Night temperature (lights off): 55-65°F (13-18°C)

Ideal Humidity Levels For Growing Weed Indoors

Discussing temperature without discussing humidity would be incomplete. Temperature and humidity are closely linked.

Variations in either can significantly impact plant health. Both factors must be carefully managed in order to have an optimal grow.

Higher humidity levels during the seedling stage help young plants retain moisture and develop strong roots.

During the vegetative stage plants benefit from moderately high humidity, which supports vigorous growth and healthy leaf development.

Slightly lower humidity during the flowering stage reduces the risk of mold and mildew while still supporting robust bud development.

Lower humidity levels in the final weeks help to prevent mold and promote the production of dense, resinous buds.

Problems From Temperatures Too Low For Indoor Growing

Too low of temperatures in indoor grow rooms can lead to a handful of problems.

Cold temperatures can slow down the metabolic processes in cannabis plants, leading to stunted growth and delayed development.

At too low of temperatures, plants may struggle to absorb nutrients effectively, leading to deficiencies and poor health.

Lower temperatures can slow down the rate of photosynthesis, diminishing the plant’s energy production and overall health.

Cold temperatures can hinder the production of essential oils and resins, affecting the quality and potency of the final product.

Problems From Temperatures Too High For Indoor Growing

Having a grow room temperature too high is much more common for indoor cannabis growers.

A marijuana growing temperature above optimal will increase the risk for pests like spider mites and diseases like powdery mildew.

Cannabis grow lights can put off a lot of heat that can create hot pockets directly below the lights. Proper air circulation and ventilation are crucial when the grow lights are on.

Keeping your cannabis grow room cool enough will be an ongoing job for indoor marijuana producers.

How To Control The Temperature In Your Grow Room

Learning how to control grow room temperature and humidity will make or break your indoor cannabis grow.

You can find the ideal temp for indoor grow room operations with a variety of appliances:

• Air Conditioner
• Space Heater
• Humidifier
• Evaporative Cooler
• Dehumidifier
• Fans

Air conditioners and evaporative coolers lower the temperature. Evaporative coolers also raise humidity levels.

Space heaters heat the room. Combination units that control humidity can raise or lower humidity based on the relative humidity of the cannabis grow room.

Fans don’t change the temperature. Instead, they keep air circulating and help you avoid hot and cold spots.

You may need some or all of these for optimal indoor marijuana growing conditions.

Get Your Cannabis Temperature Right!

Achieving the best temperature for marijuana is ideal for growing the best possible bud indoors. Managing your grow temperature with a variety of appliances is your best bet to ensure ideal indoor marijuana growing conditions.

If you want to learn about growing weed indoors and how to optimize the process, keep learning with us here at Cannabis Training University!

Luis Cordova

Luis Cordova is a distinguished author, and renowned expert in cannabis cultivation, who possesses a Master’s degree in Plant Biotechnology and Pharmaceutical Science. As a valued contributor to highly esteemed publications such as Cannabis Training University and Maximum Yield Magazine, Luis has emerged as a trusted source of guidance and knowledge in the cannabis industry. Having written thousands of informative articles, Luis is widely recognized for his comprehensive expertise on cultivating cannabis, both indoors and outdoors.

Dr. Greenthumb’s cultivates a new following in Santa Maria. O’ahu patients say aloha to the island’s tenth dispensary. And Louisiana’s new 10,000-square-foot superstore opens its doors in Lake Charles. Here are the new dispensaries openings across America this month.

Got a new shop? Put it on the map. Visit Leafly Success to advertise. 

California

Dr. Greenthumb’s—Santa Maria, CA. Opened Dec. 7. Buying cannabis from a chain owned by a member of hip hop group Cypress Hill just feels right. Owned by rapper B Real, Dr. Greenthumb’s is a popular chain of cannabis dispensaries named for the group’s 1998 ode to cultivating chronic. Their newest location — the chain’s seventh to open in California — brings the familiar touch of expert budtenders and exceptional product to the good people of Orcutt. 1604 East Clark Ave, Ste 101, Santa Maria.

Red Falcon Yucca Valley Dispensary— Yucca Valley, CA. Opened Dec. 7. Residents of Yucca Valley had an additional reason to celebrate this holiday season with the debut of the area’s first legal cannabis dispensary. Run by the Twenty-Nine Palms Band of Mission Indians, the shop is set to feature products made exclusively in-house within the Coachella Valley. With the opening of their Yucca Valley location, the Twenty-Nine Palms Band of Mission Indians is now overseeing three Red Falcon Dispensary stores in southern California. 54929 29 Palms Hwy, Yucca Valley.

Connecticut

Shangri-La—Norwalk, CT. Opened Nov. 26. You’ll have no trouble spotting the bold pink and purple paint marking Norwalk’s newest dispensary. Marking the third — and final — dispensary to be allowed to open in the city, Shangri-La features a “candy-colored drive-thru” and a retail space infused with a diverse inventory of cannabis products. The opening of Shangri-La will serve as the chain’s second Norwalk location, joining a previously opened store at 430 Main Ave. 75 Connecticut Avenue, Norwalk. shangriladispensaries.com/norwalk-shop/

Florida

Planet 13—Gulf Breeze, FL. Opened Dec. 18. Continuing their aggressive expansion into the Sunshine State, Planet 13 opened their 29th dispensary in Florida late last month. Located “within proximity of Pensacola’s iconic white sand beaches [and] historic downtown,” Planet 13’s Gulf Breeze location will serve the metro area’s growing medical cannabis community with conveniences that include express pick-up and drive-thru options. 2871 Gulf Breeze Pkwy, Gulf Breeze.

Hawaii

Cure Oahu—Kailua, HI. Opened Dec. 5. Qualified patients seeking medical cannabis in Kailua can now head to Cure O’ahu: the brand’s third store to open on the island so far. Marking O’ahu’s tenth dispensary to open to date, Cure O’ahu’s Kailua will carry forward with a mission to provide much-needed access to patients on the windward side of Oahu,” per Liam Gimon, Hawaii’s DOH Dispensary Licensing Supervisor. 70 Kihapai Street, Kailua.

Illinois

Beyond/Hello—Peoria, IL. Opened Dec. 13. Bid a welcome salutation to Beyond/Hello, Peoria’s fifth of sixth permitted dispensaries to open in the area. Making its debut just in time for the December holidays, Beyond/Hello is now overseeing five dispensaries across Illinois. Their Peoria location promises a LGBTQ+ friendly atmosphere, free parking, and a “wide range of cannabis products from nearly all IL grower processors and vendors.” 7620 IL-91 Suite A, Peoria.

Terrabis—Dixon, IL. Opened Dec. 21. Cannabis dispensary chain Terrabis continued its expansion into Illinois with the opening of its third store. Located in Dixon, the latest Terrabis location’s amenities include a customer loyalty program and a menu stocked with the best in local flower. Customers seeking additional cannabis products will find a hearty selection of pre-rolls, vape carts, edibles, and topicals available as well. 1679 S. Galena Ave., Dixon.

Louisiana

Good Day Farm—Lake Charles, LA. Opened Dec. 4. A new era is dawning with the opening of Good Day Farm in Lake Charles, which is being billed as “[the] largest medical cannabis dispensary in the South.” Clocking in at a staggering 10,000 square feet, Good Day Farm is counting on a colossal footprint paired with a generous inventory that includes “award-winning gummies, premium flower, flavorful vapes and convenient, bestselling pre-rolls.” Qualified patients can make purchases in-store, by drive-thru, or via Good Day Farm’s discreet delivery service. 3005 L’Auberge Blvd, Lake Charles.

New Jersey

Herbs Premium—Somerset, NJ. Opened Dec. 9. Residents of Somerset welcomed a new “go-to destination for elevated cannabis experiences” with the opening of Herbs Premium. Conceived as “a shared dream among close-knit family friends,” Herbs Premium was conceived as “a space that feels more like a high-end retreat than a typical dispensary.”  At Herb Premium, customers can take pleasure in speaking with experts who care, choosing between top-quality brands, and shopping at a store that supports the Somerset community through local initiatives. 757 Franklin Blvd, Somerset.

New York

Grass & Goodness— Schenectady, NY. Opened Nov. 30. Inspired by their own experiences overcoming personal struggles with the help of cannabis, Grass & Goodness is owned by a father-and-son team and staffed with trained cannabis experts. Grass & Goodness promises “a healthy dose of good vibes” and “the highest quality products from our local partners.” The shop’s offerings also include a dedicated community space that regularly plays host to educational events and yoga classes. 1650 Crane Street, Schenectady.

Domes Dispensary—Kingston, NY. Opened Nov. 30. You won’t find many dispensaries that can claim to look as cool as New York’s Domes Dispensary. Located off Route 28 near Woodstock, the Hudson Valley store consists of two connected geodesic domes. Beyond its gorgeous geometric design, Domes Dispensary sports a tantalizing menu of legal cannabis products that includes a variety of flower, tinctures, concentrates, and more. 268 Forest Hill Drive, Kingston.

Fireleaf—Brooklyn, NY. Opened Nov. 30. Trinidadian-American lawyer Vaughn Mayers saw a long saga draw to a joyful close with the opening of Fireleaf Dispensary in late November. Mayers has formerly faced legal troubles related to cannabis, making the long-awaited launch of his legal dispensary in Brooklyn, New York a true cause for jubilation. “It was a really hurtful thing, growing up in the streets of Brooklyn,” Mayers told a reporter from Caribbean Life at his store’s grand opening. “This is a reparative moment for me.” 2102 Ralph Avenue, Brooklyn.

Texas

Texas Original—The Woodlands, TX. Opened Dec. 9. Getting medical cannabis in Texas has gone from a surefire felony to a legal right, leaving the door wide open for qualified patients to finally enjoy consistent access to quality products. For those who reside in The Woodlands, the arrival of Texas Original is big news. Now open three days a week, the chain — currently the leading licensed medical cannabis dispensary service in Texas — hopes its newest location will make life easier for patients in the Houston area. 1500 Research Forest Dr, Ste 120, The Woodlands.

Did we miss any? Leave a comment with a new one.

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