Nampa, Idaho Weather
Pikas hayfeeding in granite peaks. Day 78 of spring. Read this microseason across nine climate regions →
Nampa weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 5Mostly Clear——88°49°—
- SaturdayJun 6Overcast——72°55°-16°
- SundayJun 7Overcast——70°48°-2°
- MondayJun 8Light Drizzle13%0.04″62°55°-8°
- TuesdayJun 9Drizzle31%0.05″69°50°+7°
- WednesdayJun 10Overcast23%—67°42°-2°
- ThursdayJun 11Clear12%—78°44°+11°
AQI 40 (Good), driven by PM2.5. AQI down 16 over the last 6 hours — air quality is improving sharply. PM2.5 at 10.2 µg/m³ (AQI 53) with a 0.86 fine-to-coarse ratio and 4 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.
What's driving it
PM × Wind × Precip
PM2.5 at 10.2 µg/m³ (AQI 53) with a 0.86 fine-to-coarse ratio and 4 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.86
- 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).
The higher the clouds, the finer the weather.
- Moonrise
- 6:58 AM
- Moonset
- 4:50 PM
- In sign
- ♒︎ Aquarius
Pikas hayfeeding in granite peaks
Nampa at a glance
- Today vs. normal: 19°F below the seasonal normal for this latitude
- Last frost: May 8 (climatological average for this latitude)
- Microseason: Jun 1–5
- Planting window: Harvest spring lettuce before it bolts. Sow heat-tolerant greens.
Right now in the garden
Warm-season window is open
As of June 5, the last spring frost has passed for most years. Transplant tomatoes, peppers, eggplants, basil, and cucurbits (cucumbers, squash, melons) now. Direct-sow beans and corn into warm soil.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| January | — | — |
| February | — | — |
| March | — | — |
| April | — | — |
| May | lettuce, peas, spinach, radishes | lettuce, peas, radishes |
| June | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| July | tomatoes, peppers, beans, squash | tomatoes, beans, summer squash |
| August | tomatoes, peppers, beans, squash, fall brassicas, garlic (overwinter), carrots | tomatoes, beans, summer squash |
| September | fall brassicas, garlic (overwinter), carrots | tomatoes, beans, summer squash |
| October | — | winter squash, tomatoes (last) |
| November | — | — |
| December | — | — |
A year in weather
July brings Nampa's warmest temperatures (~75°F mean) while January delivers the coldest (~31°F). December sees peak rainfall at 1.4 inches, with August receiving the least at 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
Nampa falls within a warm-summer Mediterranean climate region. This places it among nearby cities that share similar temperature ranges, seasonal patterns, and growing conditions.
Similar climates: Boise, ID, Coeur d'Alene, ID, Meridian, ID, Caldwell, ID, Post Falls, 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?
- Spring's last frost typically occurs around mid-May in Nampa, while the first fall frost arrives around mid-October.
- What is the rainy season in Nampa?
- December brings the most precipitation with about 1.4 inches of rain on average. The city receives roughly 11 inches annually.
- What is the warmest month in Nampa?
- July typically brings the warmest weather, averaging about 75°F.
- What is the coldest month in Nampa?
- January typically brings the coldest temperatures, averaging about 31°F.
- When can I start a vegetable garden in Nampa?
- Cool-season crops like peas and lettuce can be planted around the last spring frost in mid-May. Warm-season crops such as tomatoes and peppers should wait until 1–2 weeks after.
- How many rainy days does Nampa get?
- Nampa experiences about 37 rainy days per year on average.
- What hardiness zone is Nampa?
- Nampa's USDA hardiness zone depends on its lowest average winter temperature. Check the USDA's online lookup tool with the city ZIP code for the current zone designation.
Climate
Nampa, Idaho experiences a warm-summer Mediterranean climate zone. January temperatures hover near 31°F while July averages 75°F — a 44°F seasonal swing.
Throughout the year, Nampa receives about 11 inches of precipitation spread over roughly 37 rainy days.
Local weather patterns depend on latitude (43.6°N), proximity to large water bodies, and elevation. These factors determine what grows here, when frost strikes, and the daily weather patterns.