When summer temperatures climb, cannabis flower faces extra challenges. High heat, humidity swings, and light exposure can all degrade potency, aroma, and flavor. A well-informed approach to storage becomes essential. Below is a guide to help keep cannabis fresh and effective even in scorching weather.
Why Summer Is Riskier for Cannabis Quality
Cannabis is fragile. The cannabinoids (like THC and CBD) and terpenes (which contribute aroma and effects) degrade under heat, light, and oxygen exposure. Over time, THC will oxidize into less-potent compounds such as CBN.
When internal humidity is miscontrolled, mold or mildew may develop (if too damp), or the buds may dry out, breaking off trichomes and losing their aromatic oils (if too dry).
In hot climates, temperatures over about 77°F (25°C) are considered risky, as they accelerate chemical degradation as well as moisture loss.
So, what can one do? The answer lies in controlling four key factors: temperature, humidity, light, and air.
Four Pillars of Summer Cannabis Storage
- Maintain a Safe, Steady Temperature
The ideal storage range is roughly 60–70°F (15–21°C). Temperatures above 77°F (25°C) risk drying and degradation, while frequent fluctuations (as in a refrigerator that opens and closes) can cause condensation, which encourages mold.
If indoor climate control (AC) is available, choose a cool closet, basement, or insulated container to buffer against daily heat swings.
- Control Humidity (RH) Carefully
Aim for about 59–63% relative humidity (RH), which helps preserve trichomes and slows down drying without inviting moisture-based spoilage.
Humidity control packs (e.g., Boveda, Integra Boost) are widely recommended. They either release or absorb moisture to stabilize the internal environment of jars or containers.
However, avoid oversized packs relative to your jar size, and don’t overfill jars—leave some headspace so the pack can buffer.
- Keep It Dark & Shielded from Light
Ultraviolet (UV) and visible light degrade cannabinoids and terpenes, turning them into inactive forms.
Use opaque or dark containers (amber glass, tinted jars, or UV-blocking vessels). Store them in cabinets, drawers, or closets away from windows or any light source.
- Minimize Air Exchange & Oxygen Exposure
Oxygen accelerates cannabinoid breakdown. Always use airtight containers. Glass jars with tight sealing lids are preferred, as they don’t carry static charge, which can damage trichomes.
Refrain from opening the container frequently; each time you expose the content, you introduce new air.
Avoid plastic bags or thin plastic containers for long-term storage—static can attract resin crystals, and plastic can let in more oxygen over time.
Practical Summer Storage Tips & Tricks
- Don’t store cannabis in a car. The parked interior sees rapid temperature spikes that dry and degrade flower.
- Avoid fridge or freezer for flower. While cooling sounds helpful, the fluctuations and moisture can be counterproductive; plus, freezing can make trichomes brittle and break off.
- If you need extra insulation, consider wrapping your storage jar in a dark cloth or placing it inside a secondary insulated case.
- Use a hygrometer. A small humidity gauge inside your jar or container lets you monitor RH and confirm your system is working.
- Rotate stock. Use older bud first; avoid letting any jar sit unopened for excessive time unless conditions are optimal.
- Check for mold frequently. Especially in humid climates, inspect bud surfaces for fuzzy patches. If mold is visible, discard that portion immediately.
- Store strains separately. Different strains carry different terpene and aroma profiles. Keeping them in separate jars preserves their unique scent and effect profiles.
Real-World Insight from Users
Growers and consumers often report that well-cured flower stored in appropriate glass jars with humidity packs can last many months—even over a year—before noticeable degradation. One user described keeping jars only two-thirds full so humidity buffers work properly, and storing them in a dark cabinet away from heat sources.
Though anecdotal, these experiences align with scientific recommendations and reinforce the importance of temperature, humidity, and light control.
In Review
Summer weather presents real threats to cannabis quality, but with mindful storage, one can substantially mitigate the risks. The core principles are:
- Cool (60–70°F)
- Stable relative humidity (≈59–63%)
- Darkness / light shielding
- Airtight, inert containers
By following these strategies—using humidity packs, opaque jars, insulated storage spaces, and monitoring tools—enthusiasts can preserve potency, flavor, aroma, and safety even in the heat of summer. As ever, consistency is key: little fluctuations can compound over time. Store smart, check regularly, and enjoy your cannabis in top form all season long.