April is one of the cooler months of the year in Nampa, with average highs near 16.5°C and lows around 2.9°C (mean 9.7°C). It is about average for rainfall, averaging 32 mm of rainfall and 55% relative humidity across the period.
April is one of the cooler months of the year in Nampa. Across 45 years of records, the warmest April in Nampa was 1987 — when the month averaged 13.7°C — while the coldest was 2011 at 6.2°C. Typical April days reach 16.5°C with nights near 2.9°C. The long-term April temperature trend is broadly flat.
April is about average for rainfall in Nampa, averaging 32 mm of rainfall. The wettest April on record was 1993 with 58 mm, while the driest was 2008 at 11 mm.
Relative humidity in Nampa during April averages 55%. The most humid April was 1993 at 65%, and the least humid was 2021 at 43%.
April receives about 5.5 kWh/m²/day of solar energy in Nampa. The sunniest Aprils were 2015 and 2021 at 6.3 kWh/m²/day, and the cloudiest were 2003 and 2011 at 4.9.
Average wind speed in Nampa during April is 2.4 m/s. The windiest Aprils were 1984 and 2013 at 2.9 m/s, while the calmest were 1983 and 1998 at 2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 9.7°C | 9.6°C | 9.7°C | 9.8°C | 9.6°C | -0.1°C |
| Avg High | 16.7°C | 16.2°C | 16.5°C | 16.6°C | 16.7°C | 0°C |
| Avg Low | 2.7°C | 3.0°C | 2.8°C | 3.1°C | 2.6°C | -0.1°C |
| Avg Rain | 31 mm | 39 mm | 30 mm | 32 mm | 28 mm | -3 mm |
April temperatures in Nampa have risen by about 0.9°C between 1981–1985 and 2021–2025.
April has ranged from a record low of -5.1°C (1997) to a record high of 32.4°C (2020).
Rainfall in April is about average for rainfall, averaging 32 mm, with a wettest year of 58 mm.
A good time to visit Nampa
April is a good time to visit Nampa, with days averaging 16.5°C and nights around 2.9°C (mean 9.7°C, cooler than Nampa's yearly average) and moderate rainfall. June and August are marginally more temperate, but April still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 17.5°C | 10.3°C | 3.1°C | 27.3°C | -3.3°C | 15 mm | 57% | 2.1 m/s | 6 |
| 2024 | 16.7°C | 9.8°C | 2.9°C | 25.5°C | -1.2°C | 42 mm | 58% | 2.3 m/s | 5.9 |
| 2023 | 15.3°C | 8.6°C | 2.0°C | 31.0°C | -4.3°C | 26 mm | 57% | 2.5 m/s | 5.2 |
| 2022 | 14.5°C | 7.8°C | 1.1°C | 24.8°C | -3.8°C | 49 mm | 51% | 2.8 m/s | 5.2 |
| 2021 | 18.1°C | 10.7°C | 3.3°C | 28.5°C | -3.9°C | 16 mm | 43% | 2.2 m/s | 6.3 |
| 2020 | 17.9°C | 10.5°C | 3.1°C | 32.4°C | -3.5°C | 18 mm | 50% | 2.2 m/s | 6.2 |
| 2019 | 17.1°C | 10.9°C | 4.6°C | 28.6°C | 0.4°C | 41 mm | 59% | 2.5 m/s | 5.3 |
| 2018 | 17.7°C | 10.8°C | 3.9°C | 32.1°C | -3.6°C | 23 mm | 51% | 2.7 m/s | 5.4 |
| 2017 | 14.7°C | 8.6°C | 2.5°C | 22.8°C | -2.7°C | 47 mm | 61% | 2.5 m/s | 5.2 |
| 2016 | 20.0°C | 13.0°C | 5.9°C | 29.5°C | 0.8°C | 23 mm | 50% | 2.5 m/s | 6.1 |
| 2015 | 17.2°C | 9.9°C | 2.7°C | 27.9°C | -2.1°C | 19 mm | 49% | 2.4 m/s | 6.3 |
| 2014 | 16.8°C | 10.0°C | 3.2°C | 25.8°C | -1.4°C | 39 mm | 53% | 2.3 m/s | 6 |
| 2013 | 16.6°C | 9.6°C | 2.6°C | 27.8°C | -3.3°C | 20 mm | 49% | 2.9 m/s | 5.9 |
| 2012 | 18.4°C | 11.2°C | 4.0°C | 32.3°C | -3.3°C | 37 mm | 53% | 2.3 m/s | 5.4 |
| 2011 ❄️ | 12.4°C | 6.2°C | 0.0°C | 21.8°C | -4.1°C | 44 mm | 61% | 2.5 m/s | 4.9 |
| 2010 | 14.8°C | 8.1°C | 1.5°C | 26.8°C | -4.7°C | 33 mm | 56% | 2.7 m/s | 5 |
| 2009 | 15.9°C | 9.0°C | 2.0°C | 30.0°C | -4.1°C | 23 mm | 52% | 2.6 m/s | 5.8 |
| 2008 | 14.3°C | 7.3°C | 0.4°C | 26.6°C | -4.9°C | 11 mm | 49% | 2.5 m/s | 5.7 |
| 2007 | 17.3°C | 10.4°C | 3.4°C | 30.9°C | -1.9°C | 27 mm | 51% | 2.4 m/s | 5.7 |
| 2006 | 15.7°C | 9.3°C | 2.8°C | 25.5°C | -2.9°C | 53 mm | 63% | 2.3 m/s | 5.3 |
| 2005 | 16.6°C | 9.6°C | 2.7°C | 25.2°C | -3.3°C | 35 mm | 54% | 2.6 m/s | 5.1 |
| 2004 | 18.9°C | 11.7°C | 4.4°C | 29.4°C | -1.6°C | 17 mm | 49% | 2.3 m/s | 6 |
| 2003 | 14.9°C | 8.8°C | 2.7°C | 25.3°C | -3.5°C | 41 mm | 56% | 2.3 m/s | 4.9 |
| 2002 | 16.9°C | 10.0°C | 3.1°C | 26.1°C | -1.0°C | 29 mm | 51% | 2.5 m/s | 5.7 |
| 2001 | 15.2°C | 8.6°C | 2.0°C | 28.9°C | -4.8°C | 34 mm | 54% | 2.1 m/s | 5.2 |
| 2000 | 19.4°C | 11.9°C | 4.5°C | 30.8°C | -0.2°C | 26 mm | 53% | 2.2 m/s | 5.7 |
| 1999 | 15.1°C | 7.9°C | 0.8°C | 24.7°C | -4.4°C | 16 mm | 54% | 2.6 m/s | 5.8 |
| 1998 | 15.2°C | 8.8°C | 2.3°C | 28.6°C | -3.1°C | 30 mm | 58% | 2 m/s | 5.6 |
| 1997 | 14.4°C | 8.3°C | 2.1°C | 23.6°C | -5.1°C | 44 mm | 60% | 2.6 m/s | 5.4 |
| 1996 | 16.2°C | 9.7°C | 3.2°C | 28.2°C | -2.2°C | 43 mm | 58% | 2.3 m/s | 5.4 |
| 1995 | 14.8°C | 8.5°C | 2.3°C | 23.3°C | -3.1°C | 44 mm | 60% | 2.6 m/s | 5.3 |
| 1994 | 18.2°C | 11.3°C | 4.5°C | 30.6°C | -1.0°C | 32 mm | 52% | 2.4 m/s | 5.3 |
| 1993 🌧️ | 14.0°C | 8.0°C | 2.1°C | 20.0°C | -2.2°C | 58 mm | 65% | 2.2 m/s | 5 |
| 1992 | 19.5°C | 12.4°C | 5.2°C | 31.6°C | -2.0°C | 24 mm | 49% | 2.4 m/s | 5.4 |
| 1991 | 14.2°C | 7.9°C | 1.6°C | 23.2°C | -3.3°C | 42 mm | 57% | 2.5 m/s | 5.3 |
| 1990 | 20.2°C | 13.0°C | 5.8°C | 28.1°C | -2.7°C | 56 mm | 52% | 2.2 m/s | 5.5 |
| 1989 | 18.3°C | 11.1°C | 4.0°C | 28.3°C | -2.2°C | 16 mm | 56% | 2.1 m/s | 5.7 |
| 1988 | 18.7°C | 11.3°C | 3.9°C | 28.8°C | -3.0°C | 35 mm | 50% | 2.5 m/s | 5 |
| 1987 🔥 | 22.0°C | 13.7°C | 5.4°C | 31.8°C | -1.4°C | 12 mm | 45% | 2.5 m/s | 6 |
| 1986 | 15.5°C | 8.8°C | 2.0°C | 29.0°C | -2.4°C | 35 mm | 61% | 2.4 m/s | 5.5 |
| 1985 | 19.2°C | 11.6°C | 4.0°C | 29.7°C | -3.5°C | 18 mm | 51% | 2.2 m/s | 6.2 |
| 1984 | 13.3°C | 7.1°C | 0.8°C | 26.9°C | -3.1°C | 41 mm | 64% | 2.9 m/s | 5.1 |
| 1983 | 12.9°C | 7.0°C | 1.2°C | 20.1°C | -4.8°C | 47 mm | 63% | 2 m/s | — |
| 1982 | 13.5°C | 6.8°C | 0.1°C | 23.6°C | -4.1°C | 27 mm | 57% | 2.6 m/s | — |
| 1981 | 16.8°C | 10.0°C | 3.2°C | 28.5°C | -4.0°C | 46 mm | 57% | 2.1 m/s | — |
Actual recorded April data for each year, 1981–2025 — sourced from NASA POWER.
The average high in April is around 16.5°C with lows near 2.9°C (mean 9.7°C), based on 45 years of NASA POWER data.
April averages 32 mm of rainfall in Nampa, about average for rainfall. The wettest on record was 58 mm in 1993.
The hottest April reached 32.4°C in 2020. The coldest dipped to -5.1°C in 1997.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average April temperatures have risen by about 0.9°C. Daytime highs moved from 15.1°C to 16.4°C and overnight lows from 1.9°C to 2.5°C over the same span.
April is one of the cooler months of the year in Nampa and about average for rainfall, so plan for around 16.5°C daytime highs and 2.9°C at night.
Not quite — April is the 6th coolest month in Nampa, averaging 9.7°C.
For April in Nampa, pack warm layers and a jacket for chilly mornings, with typical highs of 16.5°C and lows of 2.9°C.
Relative humidity in April averages 55% — relatively dry.
Average wind speed in April is 2.4 m/s. The windiest April on record averaged 2.9 m/s (1984).
The wettest April on record was 1993 with 58 mm. On average, April sees 32 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Nampa behaves each April, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for April specifically, along with year-by-year records and how the month has changed over the decades.
