Bearded Dragon Temperature Guide

If you’re keeping a bearded dragon in San Francisco, I need you to hear this: getting the temperature and humidity right is the single most important thing you can do for your beardie. Our cool, foggy city is basically the opposite of the Australian outback these guys come from, and I’ve seen firsthand what happens when their environment is off. When I worked at Bay Area Bird & Exotics Hospital, some of the bearded dragons that came in with digestion problems or impaction just needed their setup dialed in — not medication. So let me walk you through exactly what your enclosure should look like.

The Right Temperature Ranges

Bearded dragons are desert reptiles from central Australia, and they need a clear temperature gradient in their enclosure — a hot basking spot on one end and a cooler retreat on the other. Here’s what you’re aiming for:

Why This Matters

Bearded dragons are ectotherms — they regulate their body temperature by moving between warm and cool zones. Without a proper gradient:

• Too cold: Digestion slows or stops, leading to impaction and illness
• Too hot: Overheating, stress, and dehydration
• No gradient: The dragon can’t thermoregulate, causing chronic stress

Trust me on the digestion piece. At Bay Area Bird & Exotics, I helped bearded dragons that were constipated and wouldn’t defecate — and more often than not, the root cause traced back to temperatures that were too low. A cold beardie is a beardie whose gut has essentially shut down. It’s not fun for anyone involved (especially the dragon, and honestly, especially me).

San Francisco-Specific Considerations

I live in the Inner Sunset, so I know exactly how cold our homes get. San Francisco’s average indoor temperature hovers around 60-68°F, which is well below what bearded dragons need. Here’s what that means for you:

• You’ll likely need a ceramic heat emitter (CHE) for nighttime warmth, especially if you’re in the foggy Outer Sunset, Richmond, or Parkside districts
• Your basking bulb may need to be higher wattage than guides written for warmer climates suggest
• Monitor with a digital thermometer with probe — not those stick-on strips. They’re inaccurate by 10-20°F, and I’ve seen clients think their setup was fine when it absolutely was not
• Consider a thermostat to prevent overheating if your home warms up during our rare heat waves

Humidity Levels

Here’s where San Francisco really works against you. Bearded dragons need low humidity: 30-40% relative humidity is ideal. Our natural humidity averages 70-80%. You’ll need to actively manage this.

Tips for controlling humidity:

• Use a screen-top enclosure for maximum ventilation
• Avoid placing the tank in bathrooms or kitchens
• Use a dehumidifier in the room if needed during winter months
• Don’t mist the enclosure — unlike tropical reptiles, bearded dragons don’t need extra moisture
• Provide a shallow water dish but don’t leave standing water in large quantities

What happens if humidity is too high:

• Respiratory infections (wheezing, mucus)
• Skin infections and abnormal shedding
• Fungal growth in the enclosure

I’ve seen respiratory infections sneak up on bearded dragons in the Bay Area specifically because of our humidity levels. If your beardie starts wheezing or you notice bubbles around their nostrils, get to an exotic vet — don’t wait on that one.

UVB Lighting

Bearded dragons require 10-12 hours of full-spectrum UVB lighting daily to metabolize calcium. Without it, they develop metabolic bone disease (MBD), which causes soft bones, tremors, and eventually paralysis. This is one of the most heartbreaking things I’ve seen in practice, and it’s entirely preventable.

Setup tips:

• Use a tube-style UVB bulb (T5 or T8) that spans 2/3 of the enclosure length
• Replace UVB bulbs every 6 months — they lose effectiveness before they burn out
• The basking spot should be 6-8 inches from the UVB source (for T5) or 4-6 inches (for T8)
• UVB does not pass through glass — if your bulb is above a glass top, it’s not reaching your dragon

For a complete guide to reptile environmental needs, see my Reptile & Amphibian Care Guide.

Equipment Checklist

• Digital thermometer with probe (basking and cool side)
• Hygrometer for humidity monitoring
• Basking bulb (wattage depends on enclosure size)
• Ceramic heat emitter for nighttime warmth
• Thermostat for heat regulation
• T5 or T8 UVB tube light
• Timer for consistent light cycles

When Something Looks Wrong

If your bearded dragon shows any of these signs, check their environment first — temperature and humidity problems cause the majority of issues I’ve seen with clients’ beardies. If the setup looks fine, get to an exotic vet:

• Black beard stress marks that persist all day
• Lethargy or sleeping on the cool side
• Refusing food for more than a few days
• Sunken eyes (dehydration)
• Rubbery jaw or trembling limbs (MBD)

You know your dragon. If something feels off, it probably is. Don’t second-guess yourself — these guys are tough but they’re also good at hiding when they’re struggling.

Going on a trip? I maintain precise temperature gradients, humidity levels, and UVB schedules for every reptile I care for. Learn about my in-home reptile care and reptile boarding in San Francisco. Read more: How to Prepare Your Reptile for Pet Sitting.