The summer: Warm sunny days, relaxing beach weekends, tranquil road trips through Pennsylvania’s mountain-lined roads and open fields. It’s all one-of-a-kind beautiful, but all that heat and light can degrade your medical marijuana, making it less effective and flavorful.
Because summer often means spending time away from home, it’s an ideal opportunity to become familiar with the consumption of medical marijuana and the laws around possession (and consumption) while traveling or enjoying seasonal activities. Here’s our guide to maintaining your medical marijuana’s quality in the summer and what to know about Pennsylvania’s rules about traveling with medical marijuana.
How summer conditions can degrade medical marijuana
Exposure to summer heat, humidity, sunlight and, at any time of year, even the open air can degrade the key compounds in medical marijuana, promote microbial growth, and alter the product’s consistency
Cannabinoid and terpene degradation
Medical marijuana flower naturally contains phytocannabinoids (often just called “cannabinoids”), including the intoxicating tetrahydrocannabinol (THC). It also naturally contains terpenes, which are primarily responsible for the flavors of medical marijuana and may contribute to the effects you experience. Summer conditions are known to degrade both these types of compounds.
Exposure to moisture, light, and oxygen is associated with the degradation of THC into cannabinol (CBN). This degradation may be welcome if you’re consuming medical marijuana to potentially support sleep since CBN is sometimes associated with drowsiness, but otherwise, it diminishes the therapeutic benefits THC is known for. And summertime’s humid air and abundant sun both increase the chances of THC degradation.
At temperatures of 110°F, which a car can easily reach amid outdoor temperatures of just 60°F, THC degradation can begin within just 30 minutes. However, your medical marijuana doesn’t have to reach temperatures nearly this high for degradation to begin.
Terpenes are notoriously volatile and low in molecular weight, meaning they evaporate easily even at room temperature. Light and air exposure may also convert terpenes to other compounds, as may moisture exposure. Summertime temperatures and on-the-go adventures can expedite this already rapid process, diminishing flavor and potentially impacting the efficacy of your medical marijuana.
Mold and mildew growth
All the humidity in the summer air can be problematic for your medical marijuana. When medical marijuana flower and products are exposed to humidity and moisture, they may grow mold or mildew.
Although this goes without saying, you should never consume any product that smells moldy or mildewy, or that has clear visual signs of contamination. Throw them out and visit your nearest licensed medical marijuana dispensary for fresh, new products.
Changes in product consistency
Exposure to heat may change the consistency of some products, such as medical marijuana troches, which may stick to each other at high temperatures. This defeats the purpose of their splitting into individual doses for simple consumption.
Vapes and tinctures may be affected by summer conditions too. High temperatures may thin vape oil enough to cause leaks, and the cannabinoids and terpenes in vape oil and tinctures may degrade as well. Medical marijuana concentrates may also decrease in quality, with corresponding changes in their consistency, amid exposure to oxygen, heat, and humidity. The same is true of medical marijuana topicals, which may be especially subject to consistency changes in summer conditions.
Medical marijuana storage tips for summer (and year-round)
Since terpenes and cannabinoids alike are highly prone to degradation, the classic advice of “store in a cool, dark, dry place” still rings true for medical marijuana products across the board. As for minimizing air exposure, airtight storage containers should do the trick.
If you struggle to get your home cool in the summer, temperatures no greater than 77°F will suffice. At higher temperatures, THC and terpene degradation may substantially accelerate. Notably, with cannabidiol (CBD) products, temperatures of 60 to 70°F are best.
You should also strive for humidity of 55% to 65%, though storing your products with a humidity pack may make environmental humidity a non-factor. And though you’re trying to avoid excess moisture that results in microbial growth, overly low humidity can dry out your products so much that you can’t consume them.
Should you store medical marijuana in the fridge?
You should never store medical marijuana flower or vapes in the fridge, but some patients swear by storing medical marijuana concentrates there. In particular, short-term fridge storage (or long-term freezer storage) may preserve the consistency and potency of terpene-rich extracts such as live resin and rosin. If you’re going this route, store your extract in its original container, and let it return to room temperature before re-opening the container and consuming your product. Doing so is important for maintaining its consistency.
For troches, cool, dry, dark storage outside the fridge works perfectly, but you may sometimes encounter advice to store ingestibles in the fridge. This only applies to homemade ingestibles, for which fridge storage can indeed be smart for food safety purposes. For tinctures and topicals, the standard “cool, dark, dry place” advice will suffice.
Medical marijuana and summer travel: do’s and don’ts
For optimal summer adventures, avoid driving while experiencing THC’s effects, keep your products in Pennsylvania, read up on medical marijuana laws, and consider Keystone State-only travels.
- Don’t drive while experiencing medical marijuana’s effects. Medical marijuana is well-known to diminish one’s reaction time, and being reactive and proactive is the heart of defensive driving.
- Don’t cross state lines with medical marijuana. Doing so is federally illegal, though there may be one exception. As of April 2026, the TSA website now states that medical marijuana is allowed in carry-on and checked bags, but with “special instructions.” However, the TSA has published no guidance on these instructions. Until it does, you’re best off not flying with your medical marijuana.
- Do know the laws around medical marijuana and cars. You can’t consume medical marijuana or open a product’s container in a moving or stationary car. If you’re driving within Pennsylvania, the unopened products you’ve purchased at a licensed Pennsylvania medical marijuana dispensary can stay in the glove compartment alongside your receipt.
- Do know the medical marijuana laws in any state you’re visiting. Although you can’t bring medical marijuana across state lines, many states near Pennsylvania have their own state-level markets. In these states, finding the products you need should be easy, though each state will have its own laws about how much you can purchase and where you can consume your products. Look these up before you travel so you know what to expect.
- Do buy your products at licensed dispensaries. Whether licensed medical marijuana dispensaries in Pennsylvania or licensed recreational dispensaries in a nearby state, shop within your destination’s borders to not risk violating federal law.
- Do consider travel within Pennsylvania. You have minimal chance of breaking federal medical marijuana transportation laws if you take mini-vacations within the Keystone State. A Pittsburgh weekend trip or big week in Philly can be just as fun as an adventure much farther out! And if you go this route, Vytal Options has licensed medical dispensaries all over Pennsylvania to support your wellness.
Year-round, everyday medical marijuana consumption tips
At all times of year, small initial doses, basic medical marijuana knowledge, non-alcohol consumption, smart storage, and expert support make all the difference.
- Start low and go slow. Always consume less of your product at first than you think you’ll need. Then, only consume more if you don’t feel enough effects after your product’s onset time passes.
- Understand onset time and effect duration. Some products take effect rapidly, whereas others do so within hours — this period is called the “onset time.” Likewise, these effects may last longer or shorter depending on the product you choose. Understanding both onset time and duration makes for smarter shopping.
- Don’t mix medical marijuana and alcohol. This combination is rarely pleasant. It often results in intoxication beyond the comfortable, manageable level associated with THC alone.
- Store your medical marijuana away from children and pets. On family trips or staycations alike, keeping your products out of reach from curious children and pets keeps everyone safe.
- Work with licensed medical marijuana pharmacists to find the best products. The Pennsylvania medical marijuana market spans hundreds of products that may support dozens of different conditions, and no two products are quite alike. Work with Vytal Options’ medical marijuana pharmacists to find what best suits your wellness needs and your lifestyle.
Make summer shine with Vytal Options
With locations in Fogelsville, Harrisburg, Kennett Square, Lancaster, Lansdale, and State College, Vytal Options connects Pennsylvania medical patients with compassionate, certified pharmacists and patient care specialists. We support you in learning about cannabinoid dosing, product selection, and summer-friendly medical marijuana consumption. Browse your nearest Vytal Options location’s menu to see what’s in stock, our book a remote or in-person consultation — it’s the perfect personal touch to sustain your summer.
