Cheyenne, Wyoming Weather
Thunder retreats as the monsoon dies. Day 93 of summer. Read this microseason across nine climate regions →
Cheyenne weather forecast — hour by hour, 7-day outlook, NOAA radar
Conditions updated 12:40 AM MDT · Open-Meteo
- TodaySep 21Clear——69°41°—
- TuesdaySep 22Light Drizzle10%—76°49°+7°
- WednesdaySep 23Light Drizzle10%—73°57°-3°
- ThursdaySep 24Overcast22%—73°57°0°
- FridaySep 25Light Drizzle22%—76°55°+3°
- SaturdaySep 26Overcast10%—77°60°+1°
- SundaySep 27Overcast14%—78°54°+1°
Air quality now AQI 39 · Good
AQI 39 (Good), driven by Ozone. AQI flat over the last 6 hours (within ±4 points).
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
September dries up ditches or breaks down bridges.
- Moonrise
- 4:37 PM
- Moonset
- 1:19 AM
- In sign
- ♑︎ Capricorn
Thunder retreats as the monsoon dies
Read this microseason across nine climate regions →
All 72 microseasons on the year wheel →
Cheyenne at a glance
- Today vs. normal: Today averages 55°F (high 69°F, low 41°F), about the 56°F normal for Sep 21
- Last frost: May 14 (1991–2020 median, NOAA station 2 km away)
- Microseason: Sep 21–25
- Planting calendar: September — plant garlic (overwinter); harvest tomatoes, peppers, beans, summer squash, winter squash, fall brassicas, carrots
15-Day Forecast — Cheyenne
- Mon69°41°4%
- Tue76°49°10%
- Wed73°57°10%
- Thu73°57°22%
- Fri76°55°22%
- Sat77°60°10%
- Sun78°54°14%
- Mon77°55°26%
- Tue77°52°22%
- Wed82°55°10%
- Thu81°62°13%
- Fri71°58°17%
- Sat79°56°13%
- Sun67°45°14%
- Mon72°45°13%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near Cheyenne
Interactive wind and temperature map centered on Cheyenne — it loads in your browser. Open the full weather map.
Right now in the garden
Fall planting + final harvests
As of September 21, the season's first frost (typically October 1) is approaching. Pick what frost-tender plants still carry before the next cold front. This city's planting calendar for September: plant garlic (overwinter); harvest tomatoes, peppers, beans, summer squash, winter squash, fall brassicas, and carrots.
SPC Convective Outlook
Storm Prediction Center — Cheyenne
SPC includes Cheyenne in the general thunderstorm area tomorrow — no severe risk, but storms are possible.
- TODAYNONENo severe risk
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3NONENo severe risk
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook.
Sun & seasons in Cheyenne
Cheyenne sits in Laramie County, where the year’s longest day runs 15h 8m of daylight and its shortest just 9h 12m — a swing of +5h 56m between the June and December solstices. Clocks spring forward on Sunday, March 8, 2026 and fall back on Sunday, November 1, 2026.
Cheyenne is the state’s largest city.
Air quality in Cheyenne
Air quality in Cheyenne’s county has trended dirtier since 2020; its cleanest year on record was 2020 (median AQI 39).
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| April | lettuce, peas, spinach, radishes | — |
| May | lettuce, peas, spinach, radishes | radishes |
| June | tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes |
| July | tomatoes, peppers, beans, squash, fall brassicas, carrots | lettuce, peas, spinach |
| August | garlic (overwinter) | lettuce, peas, tomatoes, peppers, beans, summer squash, garlic |
| September | garlic (overwinter) | tomatoes, peppers, beans, summer squash, winter squash, fall brassicas, carrots |
| October | — | fall brassicas, carrots |
A year in weather
July is Cheyenne's warmest stretch (~69°F) and December its coldest (~29°F); precipitation crests in May at 2.5 inches and ebbs in January to 0.4 inches.
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 29° | 0.4″ | 5 |
| February | 29° | 0.5″ | 8 |
| March | 37° | 1.0″ | 7 |
| April | 42° | 1.8″ | 11 |
| May | 52° | 2.5″ | 13 |
| June | 63° | 2.2″ | 11 |
| July | 69° | 2.2″ | 11 |
| August | 67° | 1.6″ | 10 |
| September | 59° | 1.6″ | 7 |
| October | 46° | 1.1″ | 7 |
| November | 36° | 0.6″ | 6 |
| December | 29° | 0.5″ | 6 |
Regional context
Similar climates Fox Farm-College, WY, South Greeley, WY, Warren AFB, WY
Cheyenne's climate, from NOAA NCEI 1991-2020 station normals, pairs 29°F Januarys with 69°F Julys — a 40°F swing. About 16 inches of precipitation falls over roughly 101 days a year.
Precipitation in Cheyenne runs summer-dominant: May averages 2.5 inches across 13.1 days of warm-season storms, while January drops to 0.4 inches over 4.8 rainy days of drier cool air. Cheyenne shares that warm-season-wet pattern with places like Fox Farm-College, WY, South Greeley, WY and Warren AFB, WY.
By May 14 the frosts ease in Cheyenne, opening the season for kale, peas, spinach, and parsnips. Hold Cheyenne's tender crops — tomatoes, peppers, basil — until 10-14 days past Cheyenne's last frost. Around October 1, freezing nights resume in Cheyenne and tender crops must come in. Sheltered Cheyenne yards can escape a light frost.
Similar climates: Fox Farm-College, WY, South Greeley, WY, Warren AFB, WY, Ranchettes, WY, Hillsdale, WY.
Frequently asked
- When does it freeze in Cheyenne?
- Cheyenne's last spring frost lands near May 14, and in Cheyenne the first fall frost follows around October 1.
- What is the rainy season in Cheyenne?
- Rainfall in Cheyenne peaks in May near 2.5 inches, out of about 16 inches annually.
- What is the warmest month in Cheyenne?
- Cheyenne peaks in July, when the mean runs near 69°F.
- What is the coldest month in Cheyenne?
- December is Cheyenne's coldest month, averaging about 29°F.
- When can I start a vegetable garden in Cheyenne?
- Around May 14, start frost-hardy crops in Cheyenne; tomatoes and basil belong a fortnight later.
- How many rainy days does Cheyenne get?
- Expect roughly 101 wet days a year in Cheyenne.
- What hardiness zone is Cheyenne?
- Because Cheyenne bottoms near 29°F in December, that winter low sets Cheyenne's USDA zone — verify by ZIP.
- What is the 10-day forecast for Cheyenne?
- Cheyenne's extended outlook — daily high and low temperatures and precipitation chances for each upcoming day — is in the daily forecast above.
- Will it rain this week in Cheyenne?
- See this week's day-by-day rain chances for Cheyenne in the daily forecast above, and the next 24 hours in the hourly chart.
- What is the weather like right now in Cheyenne?
- Current conditions for Cheyenne and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
- How often is the Cheyenne forecast updated?
- The Cheyenne forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
- When are sunrise and sunset in Cheyenne?
- Today's sunrise and sunset times for Cheyenne are in the Almanac section above, along with civil dawn, civil dusk, and day length. Day length is longest near the summer solstice and shortest near the winter solstice.
- How accurate is the weather forecast for Cheyenne?
- The next few days in Cheyenne's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.
Cheyenne sits at 41.1°N; its climate zone is cold semi-arid (Köppen approximation).
ZIP codes in Cheyenne
- 82001
- 82002
- 82003
- 82007
- 82009