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

Boise, Idaho Weather

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

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

Boise, ID
Saturday, July 4 at 3:56 PM
95
°
Clear
Feels like
93°
Humidity
15%
Wind
8 mph
Sunrise
12:09 AM
Sunset
3:29 PM
Boise, ID
Hour by hour · 24h
24-Hour ForecastBoise, ID: 24-hour forecast. Temperatures range from 62 to 96 degrees Fahrenheit.
L 62°H 96°
Boise, ID
7-day forecast
  1. Today
    Jul 4
    Clear
    —
    —
    96°58°—
  2. Sunday
    Jul 5
    Overcast
    —
    —
    98°62°+2°
  3. Monday
    Jul 6
    Overcast
    —
    —
    96°70°-2°
  4. Tuesday
    Jul 7
    Overcast
    —
    —
    99°71°+3°
  5. Wednesday
    Jul 8
    Overcast
    —
    —
    95°75°-4°
  6. Thursday
    Jul 9
    Clear
    —
    —
    90°66°-5°
  7. Friday
    Jul 10
    Clear
    —
    —
    100°71°+10°
Boise, ID
Next 24 hours · Hot now
HOT 90°55°80°105°12p6p12a6anow 95°high 96°low 62°
Boise, ID
Anemometer · 24h winds · from true
NESW
From · True
NW
320° · backing 15°
Direction
NW
320°
Sustained
8
mph
Gust
15
mph
Peak 24h
18
avg 5
Beaufort · 3 · GENTLE 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 5 · pk 18 @ 6:00p
01020MPHB1B2B3B4B5-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 1611SUSTGUST
−24h−18h−12h−6hnow
Light breeze backing 15° from the nw.
Boise, ID
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
921.0
-0.6 mb in 3h · falling · 27.20 inHg
Now
921.0
mb
3h
-0.6
mb
12h
+4.1
mb
24h
-0.3
mb
Regime · STORM
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 917–922
910915920925930-21h-18h-15h-12h-9h-6h-3h-24hNOW922.4917.2921.7
−24h−18h−12h−6hnow
Deep low — expect rough seas, strong wind, and persistent rain.
Boise, ID
Air quality
37
AQI
Good
↑+22 in 6h▲Peak ~45 @ 11 PM

AQI 37 (Good), driven by Ozone. AQI up 22 in the last 6 hours — air quality is degrading. Ozone at AQI 55 — peak already passed at 1 PM under clear skies. Levels should ease through evening.

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

PM 2.5Good
1.7μg/m³
PM 10Good
3μg/m³
NO₂Good
1μg/m³
OzoneDRIVERUnhealthy SG
110μg/m³
UV IndexVery high
9.0

What's driving it

Ozone × UV × Sky

Ozone at AQI 55 — peak already passed at 1 PM under clear skies. Levels should ease through evening.

Present
AQI 55
UV peak
8.5 at earlier today
Sky at peak
clear
Projected peak
AQI 55

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
Boise, ID
Sky cover · visibility · 24h
Cloud cover
0%
CLEAR
100%0%−24h−18h−12h−6hnow
Visibility
180.0mi
UNLIMITED
178 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
21:56 UTC · Boise, ID · 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
21:56 UTC · Boise, ID · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
Boise, ID
Satellite · infrared · animated
Boise, ID
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
Boise, ID
Almanac · Saturday, July 4
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
Civil dawn
5:34 AM
Sunrise
12:09 AM
Daylight
15h 20m
Sunset
3:29 PM
Civil dusk
10:06 PM
Planting note
Harvest early potatoes. Begin drying onions on the surface.
Boise, ID
The moon
Waning Gibbous
78% illuminated
Moonrise
11:47 PM
Moonset
10:52 AM
In sign
♓︎ Pisces
Boise, ID
Microseason
Jul 1–5

Monsoon storms drench the south

weather
Jan 151% of the yearDec 31

Read this microseason across nine climate regions →

Boise at a glance

  • Today vs. normal: 27°F above the seasonal normal for this latitude
  • Last frost: May 8 (climatological average for this latitude)
  • Microseason: Jul 1–5
  • Planting window: Harvest early potatoes. Begin drying onions on the surface.

ZIP codes: 83702, 83703, 83704, 83705, 83706, 83709, 83712, 83713 +3 more

16-Day Forecast — Boise

  1. Sat96°58°0%
  2. Sun98°62°1%
  3. Mon96°70°2%
  4. Tue99°71°2%
  5. Wed95°75°2%
  6. Thu90°66°0%
  7. Fri100°71°0%
  8. Sat108°79°0%
  9. Sun108°84°2%
  10. Mon110°83°3%
  11. Tue111°84°4%
  12. Wed108°84°3%
  13. Thu110°84°5%
  14. Fri112°87°9%
  15. Sat112°89°10%
  16. Sun116°90°7%

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

Live wind & temperature near Boise

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 — Boise

SPC includes Boise in the general thunderstorm area tomorrow — no severe risk, but storms are possible.

  • TODAYNONENo severe risk
  • TOMORROWTSTMGeneral Thunderstorms
  • DAY 3TSTMGeneral Thunderstorms

Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.

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——
April——
Maylettuce, peas, spinach, radisheslettuce, peas, radishes
Junelettuce, peas, spinach, radishes, tomatoes, peppers, beans, squashlettuce, peas, radishes
Julytomatoes, peppers, beans, squashtomatoes, beans, summer squash
Augusttomatoes, peppers, beans, squash, fall brassicas, garlic (overwinter), carrotstomatoes, beans, summer squash
Septemberfall brassicas, garlic (overwinter), carrotstomatoes, beans, summer squash
October—winter squash, tomatoes (last)
November——
December——

A year in weather

Boise's warmest month is July (~77°F mean) and its coldest is December (~32°F). Rainfall peaks in December (1.5 inches) and bottoms out in August (0.2 inches).

MonthMean tempPrecipRainy days
January32°1.4″5
February38°1.0″4
March45°1.3″5
April51°1.2″4
May60°1.4″4
June68°0.8″2
July77°0.2″1
August76°0.2″0
September66°0.4″1
October53°0.8″2
November40°1.2″4
December32°1.5″5

Regional context

Per NOAA NCEI 1991-2020 normals, Boise runs from a 32°F January mean to 77°F in July, a 45°F seasonal spread, with near 11.5 inches of precipitation across about 38 wet days.

Boise's moisture rides winter storm tracks: December brings 1.5 inches over 4.8 wet days, while August sees only 0.2 inches across 0.4 days in the dry warm season. It is a winter-storm rhythm Boise shares with places like Garden City, ID, Hidden Springs, ID and Meridian, ID.

Once Boise passes late-May, overnight freezes fade and peas, lettuce, spinach, and radishes can be sown. Tomatoes and peppers do best set out two weeks later in Boise, once nights clear the mid-40s°F. By early-October, frost is back in Boise — protect or harvest anything tender. A creek-bottom lot in Boise can lag Boise's last frost 7-10 days behind a south slope.

Similar climates: Garden City, ID, Hidden Springs, ID, Meridian, ID, Kuna, ID, Eagle, ID.

Naturalist notes

Mountain bluebirds return to the Boise area in late March, their azure wings catching the strengthening spring light.

Chokecherry trees bloom throughout the foothills in late April, their white flower clusters marking the transition from cool to warm season.

Frequently asked

When does it freeze in Boise?
In Boise, expect the last spring frost near mid-May; Boise's first autumn frost comes around mid-October.
What is the rainy season in Boise?
December is the wettest month in Boise, about 1.5 inches on average; the year totals roughly 12 inches.
What is the warmest month in Boise?
Boise peaks in July, when the mean runs near 77°F.
What is the coldest month in Boise?
December is Boise's coldest month, averaging about 32°F.
When can I start a vegetable garden in Boise?
Around mid-May, start frost-hardy crops in Boise; tomatoes and basil belong a fortnight later.
How many rainy days does Boise get?
Expect roughly 38 wet days a year in Boise.
What hardiness zone is Boise?
With December around 32°F, Boise's zone reflects that minimum — the USDA ZIP map confirms Boise's band.
What is the 10-day forecast for Boise?
Boise'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 Boise?
See this week's day-by-day rain chances for Boise in the daily forecast above, and the next 24 hours in the hourly chart.
What is the weather like right now in Boise?
Current conditions for Boise and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
How often is the Boise forecast updated?
The Boise forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
When are sunrise and sunset in Boise?
Today's sunrise and sunset times for Boise 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 Boise?
The next few days in Boise's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.

Climate

Set in a warm-summer Mediterranean zone, Boise, Idaho swings from 32°F in the heart of winter to 77°F at midsummer — a 45°F arc.

Yearly precipitation in Boise totals around 12 inches, spread over about 38 days of rain or snow.

Boise's 45°F range, set by its 43.6°N position, drives frost timing and what thrives in Boise.

All cities in Idaho →

ZIP codes in Boise

  • 83703
  • 83702
  • 83706
  • 83705
  • 83704
  • 83709
  • 83712
  • 83716
  • 83713
  • 83725
  • 83720
  • 83701
  • 83708
  • 83715
  • 83717
  • 83722
  • 83724
  • 83728
  • 83729
  • 83735
  • 83756
  • 83799

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.