Best times to be outside in Houston during summer heat

HOUSTON – The summer heat isn’t just uncomfortable. It can become dangerous fast.

Whether you’re planning a barbecue, taking the kids to the splash pad or training for a marathon, timing can make a huge difference during a Houston summer.

With temperatures regularly climbing into the mid-to-upper 90s and heat index values soaring above 105 degrees, doctors and meteorologists recommend scheduling outdoor activities during cooler parts of the day whenever possible.

Here’s when experts say it’s safest, and riskiest, to be outside.

Running or jogging

✅ Best times

• 5:30 a.m. to 8 a.m.
• After 8 p.m. (if routes are well-lit)

Morning temperatures are usually 10 to 20 degrees cooler than the afternoon, and the sun is less intense.

The CDC recommends scheduling outdoor workouts earlier or later in the day, rather than during the middle of the day when temperatures and solar radiation are typically highest. In Houston, that generally means taking advantage of the early morning hours before temperatures climb and waiting until after sunset for evening exercise

❌ Avoid

• 11 a.m. to 6 p.m.

This is when pavement temperatures can exceed 140 degrees, increasing both heat stress and burn risk.

While no federal agency sets a specific hour when people should stay indoors, the CDC advises limiting strenuous outdoor activity during the middle of the day, when the sun is strongest. For Houston, that’s often between late morning and early evening, when the heat index routinely exceeds 100 degrees during the summer.

Tips

• Slow your pace.
• Carry water.
• Wear light-colored, moisture-wicking clothing.
• Stop immediately if you become dizzy or nauseated.

Walking the dog

✅ Best

• Before 8 a.m.
• After sunset

❌ Avoid

• Late morning through early evening

Sidewalks and asphalt become hot enough to burn paws within seconds.

Bike rides

✅ Best

• Sunrise to 9 a.m.
• Evening after 7:30 p.m.

Cycling creates airflow, but riders still lose large amounts of sweat without realizing it.

❌ Avoid

• Noon to 5 p.m.

Heat radiating from roads can make conditions significantly hotter than the air temperature.

Kids at the playground

✅ Best

• Before 10 a.m.
• After 6:30 p.m.

❌ Avoid

• 11 a.m. to 5 p.m.

Playground slides, swings and metal equipment can become dangerously hot.

Children also overheat faster because their bodies don’t regulate temperature as efficiently as adults.

Water parks and splash pads

✅ Best

• Opening until about 11 a.m.
• After 4 or 5 p.m.

Many people assume they’re safe because they’re in the water.

But water parks can actually increase dehydration because visitors often don’t realize how much they’re sweating.

❌ Highest risk

• Noon to 4 p.m.

Swimming pools

✅ Best

• Morning
• Late afternoon
• Evening

Pools help cool you down, but swimmers can still become dehydrated and sunburned.

Don’t skip drinking water just because you’re in the pool.

Barbecues and backyard parties

✅ Best

• Start around 6 p.m.

If hosting an afternoon gathering:

• Provide shaded seating.
• Keep coolers stocked with water.
• Take breaks indoors.
• Limit alcohol in extreme heat.

❌ Toughest hours

• Noon through 5 p.m.

Standing over a grill can increase your body’s heat load even more.

Yard work

✅ Best

• Before 9 a.m.

❌ Avoid

• 10 a.m. through 6 p.m.

Lawn mowing is one of the leading summertime activities associated with heat illness because it combines heavy exertion with direct sunlight.

Outdoor sports

Best

• Before 9 a.m.
• After sunset

Teams should schedule frequent water breaks and allow athletes to acclimate gradually to the heat.

General outdoor festivals or events

If you’re attending festivals, farmers markets or community events:

Go early if possible.

If you’re outside during the afternoon:

• Find shade every 20-30 minutes.
• Drink water before you’re thirsty.
• Wear a wide-brim hat.
• Apply sunscreen every two hours.

The hours everyone should pay attention to

Know the warning signs

Heat exhaustion symptoms include:

• Heavy sweating
• Weakness
• Dizziness
• Headache
• Muscle cramps
• Nausea
• Cool, clammy skin

Heat stroke is a medical emergency. Symptoms include:

• Confusion
• Loss of consciousness
• Hot, dry skin (or profuse sweating in some cases)
• Body temperature of 104 degrees or higher

Call 911 immediately if someone shows signs of heat stroke.