Denver, Colorado – Triple-digit UV and mid-90s heat could collide with afternoon thunderstorms Sunday, July 20, making for a volatile weather mix across metro Denver. Outdoor plans after 1 p.m. may be at risk, especially along I-25, where heavy downpours could limit visibility and cause minor traffic slowdowns.
According to the National Weather Service in Boulder, a 40 percent chance of showers and thunderstorms will develop Sunday afternoon after 1 p.m., with highs reaching 94°F. Winds will shift from calm to southwest at 5–10 mph, potentially gusting to 17 mph during storm activity. Although storms are expected to be scattered, any cells that form could bring brief but intense rain, lightning, and gusty winds.
The thunderstorm risk lingers into Monday and Tuesday afternoons, both of which could see highs in the mid-90s and a 30 percent chance of storms after 3 p.m. Nighttime lows will hover around 65°F, offering little overnight relief.
What to Know for the Week Ahead:
- Sunday (July 20): High 94°F, storms likely after 1 p.m.
- Monday: High 94°F, 30% chance of PM storms
- Tuesday: High 93°F, 30% chance of PM storms
- Wednesday: Mostly sunny, high 89°F
- Thursday–Friday: Storm chances return, highs near 92°F
Safety Tips: Stay hydrated, avoid strenuous activity during peak heat, and secure outdoor items that could blow away during gusts. Watch for lightning and listen for emergency weather alerts during peak storm hours.
Expect more updates as storm timing and coverage become clearer.
