Cannabis Storage Conditions: Temperature and Humidity
Store cannabis at 59-70°F and 55-65% relative humidity in an airtight, light-blocking container. Here is how temperature and humidity protect potency.
The best humidity for cannabis storage is 58% to 62% relative humidity at 60F to 70F. Boveda 62% is the top pick for airtight jars because it holds flower at the moisture level that protects terpenes and blocks mold. Boveda 58% is the better call for vaping, since drier flower grinds and vaporizes with less clogging.
What humidity level keeps weed fresh?
Target 58% to 62% RH inside a sealed container. Under 55% RH the buds crumble and volatile terpenes escape, so aroma fades within weeks. Above 65% RH, mold and mildew get a foothold and the batch becomes unsafe.
cannabis storage conditions temperature humidity
Top pick: Boveda 62% Two-Way Humidity Control
Boveda 62% is the standard for curing and long-term storage because it both releases and absorbs moisture to hold the target RH. The pack is food-grade and stays in the jar without touching the flower.
- Holds 62% RH in sealed glass, no guesswork
- One 8-gram pack treats about one ounce of flower
- 4-gram packs fit small jars and travel cases
- Lasts two to four months once the flower is stable
Best alternatives compared
Boveda 58%
Same two-way technology at a lower set point. Pick it for vape flower, pre-rolls, and anyone who dislikes sticky, clogging grinders.
cannabis humidity control pack
Integra Boost 62% and 55%
Glycerin-based packs that regulate in both directions and include a replacement indicator card. A solid budget option, though some users report the pack dries out faster than Boveda.
Hygrometer plus glass jar
A $10 to $20 digital hygrometer turns any amber glass jar into a monitored cure room. Read it at jar level, not room level, because the headspace tells the real story.
How do you hit and hold the target humidity?
- Move flower into an airtight glass jar with minimal headspace.
- Drop in one humidity pack sized to the jar volume.
- Seal the jar and store it in a dark cabinet at 60F to 70F.
- Check the hygrometer after 12 hours and adjust the pack count.
- Burp new or freshly cured flower daily for the first week.
What happens when humidity is too high or too low?
Below 55% RH
Trichomes turn brittle and break off, so potency and flavor both drop. Dry flower also burns hot and harsh.
Above 65% RH
Moisture feeds mold, including Aspergillus, which is a health risk in inhaled flower. Water activity above 0.65, roughly 65% RH, is the danger line most labs test against.
Does the ideal humidity change by product type?
- Flower: 58% to 62% RH
- Pre-rolls: 58% to 62% RH, sealed tube recommended
- Kief, hash, and concentrates: 55% to 60% RH
- Vape carts and edibles: keep dry, humidity packs not needed
Checking moisture on flower ordered online
Mail-order flower often arrives slightly dry from shipping and packaging. Squeeze a bud: it should feel spongy and spring back, not snap. If it crumbles, a 62% pack restores it over three to five days, but flavor never returns fully, so buy from brands that ship with humidity control.
FAQ
Is 58% or 62% better for cannabis?
62% is better for long-term jar storage and curing. 58% is better for vaping and short-term jars you open often.
Can I rehydrate dry weed with orange peel or bread?
No. Those add sugars and moisture you cannot control, which invites mold. Use a two-way pack instead.
How long does cannabis stay fresh at 62% RH?
Sealed in glass at 62% RH and 60F to 70F, flower holds quality for six to twelve months and stays smokeable well past that.