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Monsoonal moisture will keep scattered storms in southeast Wyoming through Friday, then a strong ridge will push temperatures sharply higher over the weekend, raising near-record heat and fire-weather concerns across the region. The National Weather Service in Cheyenne warns residents to watch for brief but intense storms early in the period and rapidly drying conditions by Sunday.
Short-term outlook
Today’s forecast carries only a modest chance of afternoon showers and thunderstorms in Cheyenne, but localized storms could still be severe. Expect highs in the upper 80s with intermittent patchy smoke reducing air quality at times.
Late Thursday, storms moving eastward across the plains may produce large hail and damaging wind gusts—especially in areas east of Interstate 25. The immediate threat window is mainly late afternoon into early evening.
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Friday and the transition
A stalled cool front near the Laramie Range will lift the probability of precipitation Friday. Cheyenne faces a much higher chance of afternoon showers and thunderstorms, and daytime highs should fall back into the low-to-mid 80s.
By Friday night the front will weaken and winds will shift, setting the stage for a dry, warming trend under building high pressure.
Weekend heat and hazards
High pressure will drive temperatures upward over the weekend. Saturday is forecast to be warm and dry; Sunday looks considerably hotter, with widespread highs pushing into the upper 90s in the Cheyenne area.
Relative humidity is expected to drop into the single digits and low teens on Sunday, a combination that raises the region’s fire risk. That drop in moisture, paired with hot temperatures, increases the potential for rapid fire growth and dangerous conditions for outdoor burning.
- Air quality: Patchy smoke today, possible degradation in localized areas.
- Severe storm threats: Localized large hail and strong gusts Thursday afternoon/evening.
- Fire weather: Very low humidity Sunday with near-record heat—heightened danger for new ignitions.
| Day | Conditions | High / Low (°F) | PoP |
|---|---|---|---|
| Today | Mostly sunny, patchy smoke; afternoon showers/thunderstorm chance | High ~89 / Low ~57 | 20% |
| Tonight | Mostly clear, smoke lingering early | — / ~57 | 20% |
| Friday | Showers likely, a few storms possible | ~84 / ~54 | 60% |
| Saturday | Sunny and warm | ~89 / ~57 | — |
| Sunday | Sunny, very hot | ~98 / ~61 | — |
| Monday | Hot, mainly sunny | ~94 / ~56 | — |
| Midweek | Cooling trend as a Canadian front arrives; slight shower chance | Lower 80s by Tuesday–Wednesday | Small |
What this means for residents: plan for sudden storm hazards through Friday afternoon, monitor air quality if you have respiratory concerns, and treat Sunday as a high-alert day for fire safety and heat exposure. Vulnerable groups—older adults, young children and outdoor workers—should take precautions as temperatures spike.
For updates and watches, consult the National Weather Service office in Cheyenne for the latest warnings and advisories.
