Longmont, Colorado 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

676
FXUS65 KBOU 061758
AFDBOU

Area Forecast Discussion
National Weather Service Denver/Boulder CO
1158 AM MDT Tue Oct 6 2026

.KEY MESSAGES...

- Unseasonably warm through at least Saturday.

- Only isolated to scattered showers (15-30% coverage) for the
  mountains and higher terrain. Any precipitation would be light.

- Pattern change late this weekend and early next week, but
  considerable uncertainty as to when and how much temperatures
  will cool and what chance of precipitation we`ll see.

&&

.DISCUSSION /Through Monday/...
Issued at 1054 PM MDT Mon Oct 5 2026

An upper level ridge will dominate our weather through the end of
the week with much above normal temperatures. While mostly dry
weather will prevail, a weak disturbance to our west combined
with slight moistening under the ridge will lead to a few late
day showers. While most of those will be confined to the
mountains, we can`t totally rule out some virga, gusty winds, and
even a couple light late day showers spreading off the mountains
onto the Palmer Divide area and adjacent plains.

Tuesday will start off with shallow inversions and thus a fairly
quick warmup is expected again, similar to Monday. Upper level
clouds will be increasing slightly, but overall do not expect
enough opacity to limit daytime heating by more than a degree or
two. Thus, forecast highs of 85-90 seem on target across the
plains with the near 90 degree readings in the South Platte River
valley. That puts us near record highs again (For example,
Denver`s record is 87F set in 1975 and 2020 and we should be
within a degree of that, Fort Collins record of 85F set in 1905
will likely be broken).

While there is just slight cooling in the column for both
Wednesday and Thursday, temperatures will remain well above
normal. We still expect most of the plains and I-25 Corridor to
reach the lower to mid 80s under the ridge. Once again, can`t rule
out isolated to scattered showers/lone storm mainly over the
mountains. Friday and Saturday will still be warm and mostly dry
as we turn to more of a southwest flow aloft in advance of the
next storm system.

That system will dig southward down/near the Pacific Coast Sunday
and Monday, eventually allowing a cold front to slip southward
across the High Plains. It`s just that in this pattern with a more
southerly flow aloft it makes timing of these frontal surges
difficult to get a handle on. That is clearly pointed out in the
sudden spread of ensemble temperature forecasts for both Sunday
and Monday. The same can be said for our precipitation chances
with potential for interaction/incorporation of Hurricane Rachel
remnants. Overall, the forecast will reflect a cooling trend with
increasing chances of showers Sunday through early next week.

&&

.AVIATION /18Z TAFS through 18Z Wednesday/...
Issued at 1157 AM MDT Tue Oct 6 2026

VFR conditions expected through the TAF period. Light and variable
winds expected for at least the next hour as winds start to turn
northerly. Winds should settle in an east/northeast pattern by
around 20/21Z and remain predominantly easterly through the evening
hours. While precipitation is not expected over the Denver metro
area and rain chances remain at about 30% for the mountains, should
a high-based shower hold together off the higher terrain, we could
see an outflow boundary make its way across the TAF sites. By around
05Z, winds should settle into drainage for the overnight hours, with
a stronger westerly component. Another period of light and variable
winds is expected in the morning, around 14-16Z, before winds turn
northerly and then east/northeasterly for the afternoon.

&&

.BOU WATCHES/WARNINGS/ADVISORIES...
None.

&&

$$

DISCUSSION...20
AVIATION...AGS