September to end unusually warm and dry; change arrives in early October

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DENVER — September is on track to end as one of the top 20 warmest in Denver’s history. Temperatures are running about 2 degrees warmer than average and the remaining days of September will remain warmer than average.

Denver hit the 90s six times this month; the warmest was 93 degrees on Sept. 5. There were some cold days too, including a morning temperature of 37 on Sept. 10. The count of warm days outnumbered the cold ones.

The month is also running dry. The city has only had a touch more than a quarter of an inch of rain, nearly 0.6 inches drier than the average.

There will be additional clouds the last few days of the month and rain chances rise, but the month will quite likely end much drier than average. Yet, not dry enough to reach the top 20 of driest Septembers.

October will bring change, at least initially. Early next week, a strong system will enter the mountains with rain and snow, and temperatures some 20 degrees colder than what we have felt.

This system will drop snowfall throughout the central mountains through Wednesday. What will spill onto the Front Range is a slight chance for rain showers below 6,500 feet and a slight chance for a rain/snow mix for those higher than 6,500 feet.

Denver’s temperatures will drop into the 60s for highs and upper 30s to lower 40s for lows by the middle of the week.

This system is reminiscent of the one that passed through the state last weekend.