Climate averages 1991–2020
Nampa weather
in April.
A mild, fairly dry month: the 7th warmest and the 7th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
April is a mild month in Nampa: daytime highs average 16.8°C and nights cool to about 4.7°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 28 mm of rain on roughly 6 days, which makes April a fairly dry month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 24 min on an average April day.
The nearest other city in this atlas is Meridian (16 km away). In April its highs average 16.1°C, 0.7°C cooler than Nampa, with 28 mm of rain.
Among the 498 cities listed in the United States, Nampa ranks joint 320th of 498 for the warmest April highs and joint 77th of 498 for the driest April (rainfall, lowest first). The mean April high of those 498 cities is 19.4°C; Nampa is 2.6°C cooler than that mean.
From April to May, average highs rise by 5.6°C to 22.4°C, and monthly rainfall rises from 28 mm to 29 mm.
The annual picture
April 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, selected | 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 | 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
April in nearby cities
- Meridian in AprilUnited States · 16 kmHigh 16.1°C · Low 3.8°C · 28 mm rain
- Boise in AprilUnited States · 30 kmHigh 15.9°C · Low 3.8°C · 31 mm rain
- Kennewick in AprilUnited States · 360 kmHigh 19.1°C · Low 6.5°C · 17 mm rain
- Tri-Cities in AprilUnited States · 365 kmHigh 19.3°C · Low 6.6°C · 17 mm rain
- Bend in AprilUnited States · 386 kmHigh 11.7°C · Low 0.2°C · 46 mm rain
- Missoula in AprilUnited States · 422 kmHigh 11.4°C · Low 1.5°C · 53 mm rain
- Ogden in AprilUnited States · 457 kmHigh 13.6°C · Low 2.4°C · 64 mm rain
- Yakima in AprilUnited States · 460 kmHigh 15.6°C · Low 2.9°C · 19 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.