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Residents of southeast Wyoming should prepare for a quick shift in weather this week: heavy, localized downpours tonight may cause flooding in spots, then a strong dome of heat will push temperatures into the upper 90s over the weekend. The changes matter for anyone with outdoor plans, farm operations or travel across the eastern plains.
Forecasters at the National Weather Service in Cheyenne say lingering monsoonal moisture will keep the region unsettled through Friday, producing scattered showers and thunderstorms across Laramie County and surrounding areas.
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Moisture and instability are highest this afternoon, when the chance of storms climbs to about 60%. Expect heavy downpours, frequent lightning and gusty winds during stronger cells, with brief bursts of intense rainfall possible.
Temperatures will remain warm during the wet period — highs near the mid-80s today — before skies clear and lows drop into the upper 50s overnight as convective activity eases.
Transition to heat
Thursday brings a short-lived reduction in storm coverage, but the atmosphere remains warm with highs approaching the low 90s. By Saturday a ridge of high pressure is forecast to build over the region, suppressing thunderstorm formation and ushering in much hotter, drier air.
Sunday is expected to be the hottest day: the NWS projects highs near 98°F in Cheyenne, with locations east of Interstate 25 potentially topping out between 95–105°F. Those readings could prompt heat advisories across portions of the eastern plains.
Midweek cooling follows the heat surge. Monday and Tuesday should see temperatures return to the upper 80s–low 90s, with only a slight chance of late-day storms near the Laramie Range.
What to watch for
- Today: Storm likelihood ~60%; heavy downpours and gusty winds; high around 87°F.
- Tonight: Scattered showers tapering after 9 p.m.; lows near 58°F.
- Thursday: Briefly drier, mostly sunny and hot; high near 91°F; storm chance ~20% in the afternoon.
- Friday: Storms return with about a 50% chance after noon; high near 88°F.
- Saturday: Building high pressure — sunny and hot, high near 91°F.
- Sunday: Peak heat — Cheyenne near 98°F; eastern plains possibly 95–105°F; potential for heat advisories.
- Monday–Tuesday: Slight cooldown to upper 80s–low 90s; isolated late-day storms possible near the Laramie Range.
Primary concerns over the next 48 hours are localized flooding where storms train over the same area and brief wind gusts that could down branches or cause travel disruptions. By the weekend, the focus shifts to heat-related risks — especially for outdoor workers, elderly residents and anyone without access to cooling.
For the latest watches, warnings and spot forecasts, consult the National Weather Service Cheyenne.
