Climate averages 1991–2020
Nampa weather
in July.
A hot, very dry month: the warmest and one of the driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
July is a hot month in Nampa: daytime highs average 33.3°C and nights cool to about 19.2°C. By daytime temperature it is the warmest month of the year.
Expect about 3.4 mm of rain on roughly 1 day, which makes July a very dry month (one of the driest months of the year). Daylight, from sunrise to sunset, lasts about 15 h 05 min on an average July day.
The nearest other city in this atlas is Meridian (16 km away). In July its highs average 32.7°C, 0.6°C cooler than Nampa, with 3.4 mm of rain.
Among the 498 cities listed in the United States, Nampa ranks joint 88th of 498 for the warmest July highs and joint 90th of 498 for the driest July (rainfall, lowest first). The mean July high of those 498 cities is 30.3°C; Nampa is 3.0°C warmer than that mean.
From July to August, average highs fall by 1.0°C to 32.3°C, and monthly rainfall stays at 3.4 mm.
The annual picture
July in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Nampa climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 4.6°C-3.4°C | -3.4°C | 40 | 9.0 | 9.39 h |
| February | 7.7°C-1.9°C | -1.9°C | 26 | 7.4 | 10.510 h |
| March | 12.8°C1.5°C | 1.5°C | 31 | 8.6 | 11.912 h |
| April | 16.8°C4.7°C | 4.7°C | 28 | 6.4 | 13.413 h |
| May | 22.4°C9.8°C | 9.8°C | 29 | 5.9 | 14.715 h |
| June | 27.3°C14.2°C | 14.2°C | 16 | 3.4 | 15.415 h |
| July, selected | 33.3°C19.2°C | 19.2°C | 3.4 | 1.0 | 15.115 h |
| August | 32.3°C18.3°C | 18.3°C | 3.4 | 0.9 | 14.014 h |
| September | 26.5°C13.4°C | 13.4°C | 9.8 | 2.0 | 12.613 h |
| October | 18.2°C6.9°C | 6.9°C | 20 | 4.2 | 11.111 h |
| November | 9.9°C0.9°C | 0.9°C | 30 | 7.3 | 9.710 h |
| December | 4.4°C-2.9°C | -2.9°C | 42 | 9.3 | 9.09 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
July in nearby cities
- Meridian in JulyUnited States · 16 kmHigh 32.7°C · Low 18.1°C · 3.4 mm rain
- Boise in JulyUnited States · 30 kmHigh 32.7°C · Low 17.9°C · 2.6 mm rain
- Kennewick in JulyUnited States · 360 kmHigh 34.1°C · Low 19.1°C · 3.8 mm rain
- Tri-Cities in JulyUnited States · 365 kmHigh 34.2°C · Low 19.2°C · 3.8 mm rain
- Bend in JulyUnited States · 386 kmHigh 27.7°C · Low 11.3°C · 14 mm rain
- Missoula in JulyUnited States · 422 kmHigh 28.8°C · Low 15.3°C · 19 mm rain
- Ogden in JulyUnited States · 457 kmHigh 31.4°C · Low 16.9°C · 9.3 mm rain
- Yakima in JulyUnited States · 460 kmHigh 31.0°C · Low 15.3°C · 3.3 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Nampa) is explained once on the Nampa year overview and on the Sources, method and limits page.
Meridian lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.