Nampa, Idaho Weather
Granite bones emerge from cover. Day 50 of autumn. Read this microseason across nine climate regions →
Nampa weather forecast — hour by hour, 7-day outlook, NOAA radar
Conditions updated 12:26 PM MST · Open-Meteo
- TodayNov 10Clear——65°34°—
- WednesdayNov 11Overcast——71°40°+6°
- ThursdayNov 12Overcast——68°49°-3°
- FridayNov 13Overcast33%—68°50°0°
- SaturdayNov 14Light Showers70%0.41″62°44°-6°
- SundayNov 15Partly Cloudy28%—57°41°-5°
- MondayNov 16Overcast35%—55°46°-2°
Air quality now AQI 57 · Moderate
AQI 57 (Moderate), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 6.3 µg/m³ (AQI 35) with a 0.78 fine-to-coarse ratio and 2 mph wind — combustion smoke trapped in stagnant air, not road dust.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 33 now. With UV 2.6 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 8.
- Present
- AQI 33
- UV peak
- 2.6 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 8
PM × Wind × Precip
PM2.5 at 6.3 µg/m³ (AQI 35) with a 0.78 fine-to-coarse ratio and 2 mph wind — combustion smoke trapped in stagnant air, not road dust.
- PM2.5/PM10
- 0.78
- Wind
- calm
- 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).
When the wind is in the west, the weather is at its best.
- Moonrise
- 9:26 AM
- Moonset
- 5:23 PM
- In sign
- ♐︎ Sagittarius
Granite bones emerge from cover
Read this microseason across nine climate regions →
All 72 microseasons on the year wheel →
Nampa at a glance
- Today vs. normal: Today averages 50°F (high 65°F, low 34°F), 9°F above the 41°F normal for Nov 10
- Last frost: April 29 (1991–2020 median, NOAA station 2 km away)
- Microseason: Nov 6–10
- Planting calendar: November — harvest fall brassicas, carrots
16-Day Forecast — Nampa
- Tue65°35°1%
- Wed71°40°0%
- Thu68°49°0%
- Fri68°50°33%
- Sat62°44°70%
- Sun57°41°28%
- Mon55°46°35%
- Tue51°40°23%
- Wed45°37°23%
- Thu38°31°21%
- Fri41°27°10%
- Sat42°27°10%
- Sun42°27°10%
- Mon46°30°20%
- Tue45°33°15%
- Wed48°33°10%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near Nampa
Interactive wind and temperature map centered on Nampa — it loads in your browser. Open the full weather map.
Right now in the garden
Post-frost dormancy
As of November 10, the season's first frost (typically October 13) is due or past. Bring frost-tender plants indoors, mulch overwintering beds, and turn spent plantings under. This city's planting calendar for November: harvest fall brassicas and carrots.
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
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.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| April | lettuce, peas, spinach, radishes | — |
| May | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, spinach, radishes |
| June | tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes |
| July | tomatoes, peppers, beans, squash, fall brassicas, carrots | lettuce, peas, spinach, beans, summer squash, garlic |
| August | — | tomatoes, peppers, beans, summer squash, garlic |
| September | garlic (overwinter) | tomatoes, peppers, beans, summer squash, winter squash |
| October | — | tomatoes, peppers, beans, summer squash, winter squash, fall brassicas, carrots |
| November | — | fall brassicas, carrots |
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).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 31° | 1.4″ | 5 |
| February | 37° | 1.0″ | 4 |
| March | 45° | 1.3″ | 4 |
| April | 50° | 1.1″ | 4 |
| May | 59° | 1.4″ | 4 |
| June | 67° | 0.7″ | 2 |
| July | 75° | 0.3″ | 1 |
| August | 74° | 0.2″ | 1 |
| September | 64° | 0.4″ | 1 |
| October | 52° | 0.8″ | 3 |
| November | 40° | 1.2″ | 4 |
| December | 31° | 1.4″ | 5 |
Regional context
Similar climates Caldwell, ID, Meridian, ID, Star, ID
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 April 29, 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 October 13 as Nampa's overnight lows return below freezing. In about half of years, Nampa's last freeze comes after April 29.
Similar climates: Caldwell, ID, Meridian, ID, Star, ID, Middleton, ID, Kuna, ID.
Frequently asked
- When does it freeze in Nampa?
- Nampa's last spring frost lands near April 29, and in Nampa the first fall frost follows around October 13.
- 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 April 29 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.
Nampa sits at 43.6°N; its climate zone is warm-summer Mediterranean (Köppen approximation).
ZIP codes in Nampa
- 83651
- 83686
- 83687