Weather StoryAlmanac, microseasons, and the day's weather story.

Firestone, Colorado Weather

Monsoon storms drench the south. Day 14 of summer. Read this microseason across nine climate regions →

Firestone weather forecast — hour by hour, 7-day outlook, NOAA radar

Firestone, CO
Saturday, July 4 at 8:12 AM
67
°
Partly Cloudy
Feels like
64°
Humidity
56%
Wind
6 mph
Sunrise
11:36 PM
Sunset
2:32 PM
Firestone, CO
Hour by hour · 24h
24-Hour ForecastFirestone, CO: 24-hour forecast. Temperatures range from 57 to 92 degrees Fahrenheit.
L 57°H 92°
Firestone, CO
7-day forecast
  1. Today
    Jul 4
    Overcast
    —
    —
    92°56°—
  2. Sunday
    Jul 5
    Partly Cloudy
    —
    —
    96°57°+4°
  3. Monday
    Jul 6
    Overcast
    13%
    —
    99°60°+3°
  4. Tuesday
    Jul 7
    Drizzle
    37%
    —
    101°60°+2°
  5. Wednesday
    Jul 8
    Light Drizzle
    42%
    —
    97°60°-4°
  6. Thursday
    Jul 9
    Overcast
    31%
    —
    102°56°+5°
  7. Friday
    Jul 10
    Overcast
    —
    —
    102°64°0°
Firestone, CO
Next 24 hours · Mild now
HOT 90°50°75°100°6a12p6p12anow 67°high 92°low 57°
Firestone, CO
Anemometer · 24h winds · from true
NESW
From · True
SE
129° · backing 12°
Direction
SE
129°
Sustained
6
mph
Gust
8
mph
Peak 24h
27
avg 6
Beaufort · 2 · LIGHT BRZ
0
CALM
<1
1
LIGHT AIR
1–3
2
LIGHT BRZ
4–7
3
GENTLE BRZ
8–12
4
MOD BRZ
13–18
5
FRESH BRZ
19–24
6
STRONG BRZ
25–31
7
NEAR GALE
32–38
24h · sust vs gust · mph
avg 6 · pk 27 @ 8:00p
01020MPHB1B2B3B4B5-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 212SUSTGUST
−24h−18h−12h−6hnow
A whisper of wind — leaves barely shift on the trees.
Firestone, CO
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
854.9
+4.8 mb in 3h · rising rapidly · 25.25 inHg
Now
854.9
mb
3h
+4.8
mb
12h
+2.0
mb
24h
+0.5
mb
Regime · STORM
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 850–855
845850855860-21h-18h-15h-12h-9h-6h-3h-24hNOW854.9850.1854.9
−24h−18h−12h−6hnow
The low is filling — pressure climbing out of storm territory.
Firestone, CO
Air quality
59
AQI
Moderate
→-1 in 6h

AQI 59 (Moderate), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 17.1 µg/m³ (AQI 66) with a 0.92 fine-to-coarse ratio and 6 mph wind — combustion smoke trapped in calm air, not road dust.

OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.

PM 2.5DRIVERModerate
17.1μg/m³
PM 10Good
19μg/m³
NO₂Good
18μg/m³
OzoneModerate
64μg/m³
UV IndexLow
1.4

What's driving it

Ozone × UV × Sky

Ozone at AQI 30 now. With UV 4.7 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 19 around 1 PM.

Present
AQI 30
UV peak
4.7 at 1 PM
Sky at peak
clear
Projected peak
AQI 19

PM × Wind × Precip

PM2.5 at 17.1 µg/m³ (AQI 66) with a 0.92 fine-to-coarse ratio and 6 mph wind — combustion smoke trapped in calm air, not road dust.

PM2.5/PM10
0.92
Wind
light
Recent rain
0h in last 6h
Pattern
stagnant smoke

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).

7-DAY AQI TREND50100SATSUNMONTUEWEDTHUFRISAT7-DAY PM2.5 TREND · μg/m³300
Firestone, CO
Sky cover · visibility · 24h
Cloud cover
69%
PARTLY CLOUDY
100%0%−24h−18h−12h−6hnow
Visibility
65.0mi
UNLIMITED
181 mi0 mi−24h−18h−12h−6hnow
Earth · GOES-19 ABI
Full Disk · Visible · GeoColor
GOES-19 full disk Visible · GeoColor
True-color daytime, blue/IR sandwich at night
14:12 UTC · Firestone, CO · NOAA NESDIS / STAR · up to 10848 px
Continental US · GOES-19 ABI
CONUS Sector · Visible · GeoColor
GOES-19 CONUS Visible · GeoColor
Daytime true-color, blue-light/IR sandwich at night
14:12 UTC · Firestone, CO · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
Firestone, CO
Satellite · infrared · animated
Firestone, CO
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
Firestone, CO
Almanac · Saturday, July 4
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
Civil dawn
5:04 AM
Sunrise
11:36 PM
Daylight
14h 56m
Sunset
2:32 PM
Civil dusk
9:06 PM
Planting note
Harvest early potatoes. Begin drying onions on the surface.
Firestone, CO
The moon
Waning Gibbous
81% illuminated
Moonrise
10:55 PM
Moonset
10:08 AM
In sign
♓︎ Pisces
Firestone, CO
Microseason
Jul 1–5

Monsoon storms drench the south

weather
Jan 151% of the yearDec 31

Read this microseason across nine climate regions →

Firestone at a glance

  • Today vs. normal: 4°F below the seasonal normal for this latitude
  • Last frost: April 17 (climatological average for this latitude)
  • Microseason: Jul 1–5
  • Planting window: Harvest early potatoes. Begin drying onions on the surface.

ZIP code: 80520

16-Day Forecast — Firestone

  1. Sat92°56°5%
  2. Sun96°57°3%
  3. Mon99°60°13%
  4. Tue101°60°37%
  5. Wed97°60°42%
  6. Thu102°56°31%
  7. Fri102°64°8%
  8. Sat99°59°5%
  9. Sun110°65°8%
  10. Mon110°66°15%
  11. Tue108°71°22%
  12. Wed96°64°49%
  13. Thu90°64°49%
  14. Fri93°63°48%
  15. Sat97°65°42%
  16. Sun98°67°39%

Forecast data from Open-Meteo (CC BY 4.0).

Right now in the garden

Peak growing season

As of July 4, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.

SPC Convective Outlook

Storm Prediction Center — Firestone

SPC has placed Firestone in the Slight Risk category for severe thunderstorms today.

  • TODAYSLGTSlight Risk
  • TOMORROWTSTMGeneral Thunderstorms
  • DAY 3TSTMGeneral Thunderstorms

Scattered severe storms possible. A few tornadoes, hail, and damaging wind gusts possible.

Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.

January 1–5: Deep freeze grips the high peaks.January 6–10: Ice thickens on alpine tarns.January 11–15: Springs stir beneath locked earth.January 16–20: Grouse call from the transition zone.January 21–25: First signals of the soil's turning.January 26–31: Stream water crystallizes thick.February 1–5: The year's coldest fortnight begins.February 6–10: East wind carries a subtle promise.February 11–15: Snowmelt springs whisper beneath ice.February 16–20: Red-wing calls rise from the wetlands.February 21–25: Rain begins to trace the snowline upward.February 26–28: Mist gathers in the warming canyons.March 1–5: Grass and trees stir from their sleep.March 6–10: Hibernators break through frozen ground.March 11–15: First blooms open to the spring sun.March 16–20: Mountain bluebirds return to the summits.March 21–25: Spring equinox at the divide.March 26–31: Aspen catkins burst in clusters.April 1–5: Thunderstorms rumble over granite peaks.April 6–10: Swallows and swifts slice the warming sky.April 11–15: Sandhill cranes call through the wetlands.April 16–20: Rainbows arch over the snowfields.April 21–25: New growth explodes across the montane.April 26–30: Last frost yields to summer growth.May 1–5: Wildflowers crest the high meadows.May 6–10: Summer monsoon clouds gather southward.May 11–15: Snowmelt crests toward the divide.May 16–20: High country wildflowers peak.May 21–25: Summer heat accelerates the growing season.May 26–31: Summer settles into the high country.June 1–5: Pikas hayfeeding in granite peaks.June 6–10: Glacier lily carpets the snowmelt.June 11–15: Paintbrush crowns the ridges.June 16–20: Thunderheads build by noon.June 21–25: Long light holds the peaks.June 26–30: Monsoon moisture drifts north.July 1–5: Monsoon storms drench the south.July 6–10: Wind builds through canyons.July 11–15: Lightning crowns every peak.July 16–20: Elk herds claim alpine meadows.July 21–25: Pika caches reach their peak.July 26–31: Monsoon pulses weaken northward.August 1–5: Summer heat breaks with monsoon.August 6–10: First frost creeps to peaks.August 11–15: Cool wind returns from north.August 16–20: Monsoon clouds gather over the peaks.August 21–25: The monsoon breaks into scattered showers.August 26–31: Summer insects thin as autumn wind rises.September 1–5: Elk descend from summer high meadows.September 6–10: Dew crystallizes on high grass at dawn.September 11–15: Hawks begin the long crossing southward.September 16–20: Equinox: darkness claims the high passes.September 21–25: Thunder retreats as the monsoon dies.September 26–30: First frost hardens the high valleys.October 1–5: October: the aspen stands reach their peak.October 6–10: Aspen gold slides downslope with the chill.October 11–15: Snow settles on the high passes.October 16–20: Elk bugling fades as rut nears its end.October 21–25: First hard frost grips the basin.October 26–31: Late rains settle into November patterns.November 1–5: Aspen canopy falls to earth.November 6–10: Granite bones emerge from cover.November 11–15: Earth begins to harden.November 16–20: Bare ranges hold silence.November 21–25: Snow returns to the peaks.November 26–30: North wind strips the landscape.December 1–5: Deep darkness settles over the ranges.December 6–10: Winter locks the high country.December 11–15: Elk withdraw to winter range.December 16–20: Ice thickens across frozen water.December 21–25: Winter solstice — the sun returns.December 26–31: The year closes in silence.🌱February 14 — First skunk-cabbage spathes thaw their way up☀️March 20 — Spring equinox — day and night balance🌸April 5 — Cherry blossoms peak in the parks🐦May 10 — Warbler migration peaks along the coast✨May 25 — First fireflies scout the meadows at dusk🌞June 21 — Summer solstice — longest day🦗July 25 — Peak cicada chorus in the afternoons🌊August 18 — Warmest sea-surface temperatures of the year🍂September 22 — Autumn equinox — the slow turn❄️October 25 — First widespread frost in the suburbs🍁November 10 — Peak leaf color across the Hudson Valley🌙December 21 — Winter solstice — longest night

Microseason · July 1–5

Monsoon storms drench the south

Monsoon established in southern Mountain West (New Mexico, southern Utah, Arizona north); afternoon downpours and lightning common.

Day 185 of 365 · Wedge 37 of 72

The solar year drawn as a wheel of 72 five-day windows. Each wedge is one microseason; the four colored arcs mark winter, spring, summer, and autumn; the small icons sit at notable phenological events. The crimson pointer creeps clockwise as the year turns.

Planting calendar

MonthPlantHarvest
January——
February——
March——
Aprillettuce, peas, spinach, radishes—
Maylettuce, peas, spinach, radishes, tomatoes, peppers, beans, squashlettuce, peas, radishes
Junetomatoes, peppers, beans, squashlettuce, peas, radishes
Julytomatoes, peppers, beans, squashtomatoes, beans, summer squash
August—tomatoes, beans, summer squash
Septemberfall brassicas, garlic (overwinter), carrotstomatoes, beans, summer squash
Octoberfall brassicas, garlic (overwinter), carrotswinter squash, tomatoes (last)
November——
December——

A year in weather

The year in Firestone tops out in July (~73°F) and dips lowest in January (~29°F), with April wettest at 2.0 inches and December driest at 0.5 inches.

MonthMean tempPrecipRainy days
January29°0.6″2
February32°0.6″2
March42°1.2″3
April48°2.0″5
May57°2.0″6
June67°1.8″5
July73°1.7″3
August71°1.9″3
September63°1.3″4
October50°1.0″3
November39°0.8″3
December30°0.5″1

Regional context

By the nearest station's NOAA NCEI 1991-2020 normals, Firestone sees 29°F Januarys and 73°F Julys, a 44°F range, plus around 15.2 inches of precipitation across 40 days.

Precipitation in Firestone runs summer-dominant: April averages 2.0 inches across 5.1 days of warm-season storms, while December drops to 0.5 inches over 1.0 rainy days of drier cool air. It is a warm-season-wet pattern Firestone shares with places like Frederick, CO, Mead, CO and Dacono, CO.

The cool-season window in Firestone starts at mid-April, when nights stop freezing — think kale, peas, spinach, and parsnips. In Firestone, warm-season transplants — tomatoes, peppers, basil — wait two weeks past Firestone's frost date. Around mid-November, freezing nights resume in Firestone and tender crops must come in. Within Firestone, cold-air pooling chills low spots by 5-10°F, shifting Firestone's local frost dates.

Similar climates: Frederick, CO, Mead, CO, Dacono, CO, Platteville, CO, Longmont, CO.

Frequently asked

When does it freeze in Firestone?
In Firestone, expect the last spring frost near mid-April; Firestone's first autumn frost comes around mid-November.
What is the rainy season in Firestone?
Rainfall in Firestone peaks in April near 2.0 inches, out of about 15 inches annually.
What is the warmest month in Firestone?
Firestone peaks in July, when the mean runs near 73°F.
What is the coldest month in Firestone?
January is Firestone's coldest month, averaging about 29°F.
When can I start a vegetable garden in Firestone?
Around mid-April, start frost-hardy crops in Firestone; tomatoes and basil belong a fortnight later.
How many rainy days does Firestone get?
Firestone records around 40 days of measurable precipitation annually.
What hardiness zone is Firestone?
Since January in Firestone averages 29°F, Firestone's USDA zone follows that floor — confirm it by ZIP.
What is the 10-day forecast for Firestone?
Firestone'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 Firestone?
See this week's day-by-day rain chances for Firestone in the daily forecast above, and the next 24 hours in the hourly chart.
What is the weather like right now in Firestone?
Current conditions for Firestone and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
How often is the Firestone forecast updated?
The Firestone forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
When are sunrise and sunset in Firestone?
Today's sunrise and sunset times for Firestone 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 Firestone?
The next few days in Firestone's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.

Climate

Set in a cold semi-arid zone, Firestone, Colorado swings from 29°F in the heart of winter to 73°F at midsummer — a 44°F arc.

Rain and snow bring Firestone roughly 15 inches a year across approximately 40 measurable-precipitation days.

Firestone's 44°F range, set by its 40.2°N position, drives frost timing and what thrives in Firestone.

All cities in Colorado →

Longmont, CO weather →

ZIP codes in Firestone

  • 80520
  • 80504

Climate normals from the Open-Meteo Climate API. Köppen approximation from NOAA NCEI U.S. Climate Regions. See methodology for data sources, editorial rules, and corrections. Maintainer: Brian Tighe.