Thunderstorm-driven weather is the dominant hazard at Colorado National Monument, with recorded events including 4 thunderstorm wind incidents, 3 hail storms, and 2 flash floods in the surrounding Mesa County area. Those canyon-country storms build fast in summer afternoons and can send walls of water through narrow drainages with very little warning, making timing and terrain awareness critical for visitors.
If you're hiking or camping here, plan to be off exposed canyon rims and back at your site by early afternoon before convective storms develop. Pack a weather radio or download an offline alert app, since cell coverage is unreliable inside the monument. For flash flood risk specifically, never camp in dry creek beds or low wash areas — choose elevated ground and keep an eye on the color of the sky upcanyon, not just directly overhead.
Top recorded hazards in Mesa County
County dataFrom NOAA Storm Events (2024). Counts of recorded incidents — not all occurred at this park.
- Thunderstorm Wind 4
- Hail 3
- Flash Flood 2
- Heavy Rain 1
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About Colorado National Monument
Colorado National Monument preserves one of the grand landscapes of the American West. But this treasure is much more than a monument. Towering monoliths exist within a vast plateau and canyon panorama. You can experience sheer-walled, red rock canyons along the twists and turns of Rim Rock Drive, where you may spy bighorn sheep and soaring eagles.
Weather
Spring: Daytime high temperatures 70-85 F (21-30 C), nighttime low temperature 30-50 F (-1 - +10 C). Summer: Daytime high temperatures can reach 100 F (38 C), afternoon thunderstorms common. Fall: Similar to spring temperatures, sudden changes in weather common. Snow can occur in October. Winter: Daytime highs vary from 10 - 45 F (-12 - +7 C). Snow common, patches of snow and ice stay around most of the winter.