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

Nampa, Idaho Weather

Summer heat breaks with monsoon. Day 43 of summer. Read this microseason across nine climate regions →

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

Nampa, ID
Sunday, August 2 at 9:00 AM
66
°
Clear
Feels like
58°
Humidity
33%
Wind
11 mph
Sunrise
12:37 AM
Sunset
3:07 PM
Nampa, ID
Hour by hour · 24h
24-Hour ForecastNampa, ID: 24-hour forecast. Temperatures range from 56 to 87 degrees Fahrenheit.
L 56°H 87°
Nampa, ID
7-day forecast
  1. Today
    Aug 2
    Clear
    —
    —
    87°62°—
  2. Monday
    Aug 3
    Clear
    —
    —
    83°56°-4°
  3. Tuesday
    Aug 4
    Overcast
    —
    —
    94°57°+11°
  4. Wednesday
    Aug 5
    Overcast
    —
    —
    99°59°+5°
  5. Thursday
    Aug 6
    Clear
    —
    —
    106°65°+7°
  6. Friday
    Aug 7
    Clear
    —
    —
    109°70°+3°
  7. Saturday
    Aug 8
    Clear
    —
    —
    103°68°-6°
Nampa, ID
Next 24 hours · Mild now
HOT 90°50°73°95°12p6p12a6anow 66°high 87°low 56°
Nampa, ID
Anemometer · 24h winds · from true
NESW
From · True
NW
319° · backing 21°
Direction
NW
319°
Sustained
11
mph
Gust
19
mph
Peak 24h
34
avg 10 mph
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 10 mph · pk 34 mph @ 12:00a
0102030MPHB1B2B3B4B5B6-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 2512SUSTGUST
−24h−18h−12h−6hnow
Light breeze backing 21° from the nw.
Nampa, ID
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
928.1
+0.9 mb in 3h · rising · 27.41 inHg
Now
928.1
mb
3h
+0.9
mb
12h
+3.5
mb
24h
+0.3
mb
Regime · STORM
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 925–929
920925930935-21h-18h-15h-12h-9h-6h-3h-24hNOW929.4924.6928.1
The low is filling — pressure climbing out of storm territory.
Nampa, ID
Air quality
143
AQI
Unhealthy for Sensitive Groups
↓-13 in 6h

AQI 143 (Unhealthy for Sensitive Groups), driven by PM2.5. AQI down 13 over the last 6 hours (gradual decline). PM2.5 at 46.4 µg/m³, PM10 at 49.5 µg/m³ — typical background levels with no transport signature.

CAUTION Sensitive groups (children, elderly, respiratory conditions) should limit prolonged outdoor exertion.

PM 2.5DRIVERUnhealthy SG
46.4μg/m³
PM 10Good
50μg/m³
NO₂Good
5μg/m³
OzoneModerate
94μg/m³
UV IndexLow
1.4

What's driving it

Ozone × UV × Sky

Ozone at AQI 44 now. With UV 2.8 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 16.

Present
AQI 44
UV peak
2.8 at 1 PM
Sky at peak
clear
Projected peak
AQI 16

PM × Wind × Precip

PM2.5 at 46.4 µg/m³, PM10 at 49.5 µg/m³ — typical background levels with no transport signature.

PM2.5/PM10
0.94
Wind
breezy
Recent rain
0h in last 6h
Pattern
background

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 TREND50100SUNMONTUEWEDTHUFRISATSUN7-DAY PM2.5 TREND · μg/m³890
Nampa, ID
Sky cover · visibility · 24h
Cloud cover
0%
CLEAR
100%0%−24h−18h−12h−6hnow
Visibility
51.0mi
UNLIMITED
185 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
15:00 UTC · Nampa, 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
15:00 UTC · Nampa, ID · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
Nampa, ID
Satellite · infrared · animated
Nampa, ID
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
Nampa, ID
Almanac · Sunday, August 2
Red sky at night, sailor's delight.
Civil dawn
6:05 AM
Sunrise
12:37 AM
Daylight
14h 30m
Sunset
3:07 PM
Civil dusk
9:42 PM
Planting note
Sow fall peas. Start kale and collard seedlings for fall.
Nampa, ID
The moon
Waning Gibbous
84% illuminated
Moonrise
10:32 PM
Moonset
10:58 AM
In sign
♓︎ Pisces
Nampa, ID
Microseason
Aug 1–5

Summer heat breaks with monsoon

plant
Jan 159% of the yearDec 31

Read this microseason across nine climate regions →

Nampa at a glance

  • Today vs. normal: 7°F above the seasonal normal for this latitude
  • Last frost: May 8 (climatological average for this latitude)
  • Microseason: Aug 1–5
  • Planting window: Sow fall peas. Start kale and collard seedlings for fall.

ZIP codes: 83651, 83686, 83687

16-Day Forecast — Nampa

  1. Sun87°62°0%
  2. Mon83°56°0%
  3. Tue94°57°0%
  4. Wed99°59°0%
  5. Thu106°65°0%
  6. Fri109°70°0%
  7. Sat103°68°0%
  8. Sun101°63°1%
  9. Mon101°64°1%
  10. Tue102°60°1%
  11. Wed101°63°0%
  12. Thu95°67°3%
  13. Fri95°59°6%
  14. Sat102°64°9%
  15. Sun102°67°17%
  16. Mon99°63°15%

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

Live wind & temperature near Nampa

Right now in the garden

Peak growing season

As of August 2, 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.

Sun & seasons in Nampa

Nampa sits in Canyon County, where the year’s longest day runs 15h 26m of daylight and its shortest just 8h 56m — a swing of +6h 30m between the June and December solstices. Clocks spring forward on Sunday, March 8, 2026 and fall back on Sunday, November 1, 2026.

Boise, the state’s largest city, lies about 17 miles to the E. The nearest town Nampa tracks is Meridian, roughly 9 miles to the ENE.

Air quality in Nampa’s county has trended cleaner since 2020; its cleanest year on record was 2023 (median AQI 34). See the full air-quality history for Nampa.

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 · August 1–5

Summer heat breaks with monsoon

Late summer monsoon surge; southern reaches drench under Gulf moisture; northern peaks cool rapidly as monsoon remnants push north.

Day 214 of 365 · Wedge 43 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

Nampa peaks at about 75°F in July and bottoms near 31°F in January; December brings the heaviest rain (1.4 inches) and August the least (0.2 inches).

MonthMean tempPrecipRainy days
January31°1.4″5
February37°1.0″4
March45°1.3″4
April50°1.1″4
May59°1.4″4
June67°0.7″2
July75°0.3″1
August74°0.2″1
September64°0.4″1
October52°0.8″3
November40°1.2″4
December31°1.4″5

Regional context

Nampa's climate, from NOAA NCEI 1991-2020 station normals, pairs 31°F Januarys with 75°F Julys — a 44°F swing. About 11 inches of precipitation falls over roughly 37 days a year.

Precipitation in Nampa peaks in the cool season: December averages 1.4 inches across 4.7 storm-fed days, while August bottoms out at 0.2 inches over just 0.7 rainy days. That groups Nampa with places like Caldwell, ID, Meridian, ID and Star, ID on the same cool-season storm track.

The cool-season window in Nampa starts at late-May, when nights stop freezing — think peas, lettuce, spinach, and radishes. In Nampa, warm-season transplants — tomatoes, peppers, basil — wait two weeks past Nampa's frost date. Nampa's window closes around early-October as overnight lows return below freezing. In Nampa, low spots run 4-7°F colder than nearby slopes, nudging Nampa's frost dates a week.

Similar climates: Caldwell, ID, Meridian, ID, Star, ID, Middleton, ID, Kuna, ID.

Naturalist notes

By late May, western meadowlarks establish their territories across Nampa's grasslands, their distinctive yellow breasts visible as they perch on fence posts.

Serviceberry bushes bloom throughout the Treasure Valley in April, their white clusters appearing just as the last frost risk passes.

Frequently asked

When does it freeze in Nampa?
Nampa's last spring frost lands near mid-May, and in Nampa the first fall frost follows around mid-October.
What is the rainy season in Nampa?
Nampa sees its heaviest rain in December (around 1.4 inches), part of roughly 11 inches a year.
What is the warmest month in Nampa?
The warmest stretch in Nampa comes in July, around 75°F on average.
What is the coldest month in Nampa?
On average January is the chilliest month in Nampa, about 31°F.
When can I start a vegetable garden in Nampa?
Frost-hardy sowings begin at mid-May in Nampa; warm-season starts follow two weeks on.
How many rainy days does Nampa get?
Nampa records around 37 days of measurable precipitation annually.
What hardiness zone is Nampa?
Nampa sits in the USDA zone set by January lows near 31°F; the USDA ZIP tool gives the band.
What is the 10-day forecast for Nampa?
Nampa'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 Nampa?
See this week's day-by-day rain chances for Nampa in the daily forecast above, and the next 24 hours in the hourly chart.
What is the weather like right now in Nampa?
Current conditions for Nampa and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
How often is the Nampa forecast updated?
The Nampa forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
When are sunrise and sunset in Nampa?
Today's sunrise and sunset times for Nampa 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 Nampa?
The next few days in Nampa's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.

Climate

Nampa, Idaho occupies a warm-summer Mediterranean zone, with January means near 31°F and July around 75°F — a 44°F swing.

Nampa sees close to 11 inches of precipitation annually, falling across some 37 wet days.

Latitude 43.6°N gives Nampa its 44°F swing, and with it the rhythm of Nampa's growing season.

All cities in Idaho →

Boise, ID weather →

ZIP codes in Nampa

  • 83651
  • 83687
  • 83686

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.