Fall Will Arrive in Denver Tuesday Evening
The autumnal equinox marks the end of summer as Denver prepares for seasonal changes and incoming storms.
Updated on Sept. 21, 2026 in Current Conditions
Summer will reach its final full day on Monday as Denver transitions into the new season. The autumnal equinox officially occurs on Tuesday at 6:04 pm MT.
Why it matters
The change in season brings a shift in local weather patterns for the Denver area. Residents can expect a transition from the mild conditions of summer to a week characterized by unsettled weather and shifting temperatures.
Denver will see temperatures reach the mid-70s on Monday before experiencing isolated showers and storms on Tuesday. Forecasts indicate temperatures could rebound to the mid-80s by Saturday.
The details
While Monday remains mostly sunny to close out the summer, the pattern will change as the equinox arrives. Following the Tuesday evening shift, isolated showers and storms are expected to persist throughout the remainder of the week.
Timeline
Monday marks the final full day of summer.
Tuesday is when isolated showers and storms will return.
Tuesday at 6:04 pm MT is when the autumnal equinox occurs.
Saturday is when temperatures may reach the mid-80s.
Seasonal Patterns
This seasonal transition follows the pattern set by the National Weather Service's autumnal equinox transition. The shift aligns with historical meteorological trends that define the end of summer across the Rocky Mountain region.
Residents should prepare for the return of isolated storms by monitoring local weather alerts throughout the week. Keep a raincoat or umbrella handy as the region transitions into the new season.
The takeaway
The arrival of fall serves as a reminder to adjust outdoor plans to account for increasingly unsettled weather. Keep track of daily fluctuations as the region moves toward potentially warmer temperatures heading into the weekend.
Further reading
Stay updated on the shifting local forecast by visiting the Denver page.
