April is one of the cooler months of the year in Idaho Falls, with average highs near 11.7°C and lows around -1.2°C (mean 5.3°C). It is about average for rainfall, averaging 47 mm of rainfall and 62% relative humidity across the period.
April is one of the cooler months of the year in Idaho Falls. Across 45 years of records, the warmest April in Idaho Falls was 1987 — when the month averaged 9.3°C — while the coldest was 2011 at 2.1°C. Typical April days reach 11.7°C with nights near -1.2°C. The long-term April temperature trend is broadly flat.
April is about average for rainfall in Idaho Falls, averaging 47 mm of rainfall. The wettest April on record was 2017 with 99 mm, while the driest were 1985 and 1987 at 13 mm.
Relative humidity in Idaho Falls during April averages 62%. The most humid April was 2017 at 71%, and the least humid was 1987 at 48%.
April receives about 5.2 kWh/m²/day of solar energy in Idaho Falls. The sunniest Aprils were 1987 and 2021 at 6 kWh/m²/day, and the cloudiest was 2011 at 4.3.
Average wind speed in Idaho Falls during April is 2.9 m/s. The windiest April was 2022 at 3.3 m/s, while the calmest was 1998 at 2.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 5.5°C | 5.1°C | 5.8°C | 5.1°C | 4.7°C | -0.8°C |
| Avg High | 12.2°C | 11.3°C | 12.4°C | 11.5°C | 11.2°C | -1°C |
| Avg Low | -1.2°C | -1.1°C | -0.8°C | -1.2°C | -1.8°C | -0.6°C |
| Avg Rain | 37 mm | 46 mm | 45 mm | 64 mm | 41 mm | +4 mm |
April temperatures in Idaho Falls have risen by about 0.3°C between 1981–1985 and 2021–2025.
April has ranged from a record low of -14°C (1983) to a record high of 27.2°C (2012).
Rainfall in April is about average for rainfall, averaging 47 mm, with a wettest year of 99 mm.
A good time to visit Idaho Falls
April is a good time to visit Idaho Falls, with days averaging 11.7°C and nights around -1.2°C (mean 5.3°C, cooler than Idaho Falls's yearly average) and moderate rainfall. July 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 | 13.0°C | 6.3°C | -0.4°C | 21.0°C | -5.9°C | 33 mm | 59% | 2.7 m/s | 5.6 |
| 2024 | 12.4°C | 5.8°C | -0.8°C | 20.3°C | -6.7°C | 35 mm | 65% | 2.7 m/s | 5.4 |
| 2023 | 9.3°C | 3.2°C | -3.0°C | 23.1°C | -11.0°C | 40 mm | 67% | 2.8 m/s | 5.9 |
| 2022 | 8.8°C | 2.9°C | -3.1°C | 19.0°C | -9.4°C | 55 mm | 61% | 3.3 m/s | 4.6 |
| 2021 | 12.2°C | 5.1°C | -1.9°C | 25.6°C | -6.7°C | 29 mm | 56% | 2.6 m/s | 6 |
| 2020 | 11.2°C | 4.9°C | -1.4°C | 22.4°C | -8.1°C | 54 mm | 62% | 2.8 m/s | 5.5 |
| 2019 | 11.6°C | 5.8°C | 0.1°C | 20.1°C | -5.0°C | 59 mm | 70% | 2.9 m/s | 4.5 |
| 2018 | 11.2°C | 5.1°C | -1.0°C | 23.0°C | -7.7°C | 91 mm | 69% | 3.1 m/s | 5 |
| 2017 🌧️ | 9.8°C | 4.2°C | -1.3°C | 17.7°C | -5.5°C | 99 mm | 71% | 3.2 m/s | 4.8 |
| 2016 | 14.5°C | 7.4°C | 0.4°C | 22.0°C | -5.3°C | 45 mm | 65% | 2.8 m/s | 5.4 |
| 2015 | 12.5°C | 5.9°C | -0.7°C | 22.3°C | -4.9°C | 40 mm | 60% | 2.7 m/s | 5.6 |
| 2014 | 11.6°C | 4.9°C | -1.9°C | 18.9°C | -7.3°C | 54 mm | 63% | 3.1 m/s | 5.3 |
| 2013 | 10.3°C | 3.9°C | -2.6°C | 20.8°C | -8.3°C | 40 mm | 61% | 3 m/s | 5.4 |
| 2012 | 14.6°C | 7.5°C | 0.5°C | 27.2°C | -6.8°C | 44 mm | 58% | 3.1 m/s | 5.5 |
| 2011 ❄️ | 7.8°C | 2.1°C | -3.5°C | 15.8°C | -6.7°C | 89 mm | 70% | 3.1 m/s | 4.3 |
| 2010 | 10.9°C | 4.6°C | -1.7°C | 22.6°C | -7.0°C | 77 mm | 62% | 3.1 m/s | 5.3 |
| 2009 | 10.8°C | 4.6°C | -1.6°C | 21.4°C | -8.5°C | 66 mm | 67% | 2.5 m/s | 5.1 |
| 2008 | 8.7°C | 2.5°C | -3.6°C | 21.1°C | -10.1°C | 26 mm | 61% | 2.8 m/s | 5.9 |
| 2007 | 13.0°C | 6.4°C | -0.3°C | 25.7°C | -6.3°C | 37 mm | 60% | 2.6 m/s | 5.4 |
| 2006 | 13.0°C | 6.5°C | -0.1°C | 22.1°C | -6.2°C | 71 mm | 66% | 2.8 m/s | 5.1 |
| 2005 | 12.4°C | 5.5°C | -1.4°C | 19.4°C | -5.9°C | 50 mm | 60% | 3 m/s | 5.4 |
| 2004 | 14.1°C | 7.3°C | 0.5°C | 22.1°C | -3.9°C | 36 mm | 59% | 2.7 m/s | 5.4 |
| 2003 | 12.0°C | 5.7°C | -0.7°C | 21.4°C | -6.5°C | 48 mm | 60% | 2.9 m/s | 4.7 |
| 2002 | 12.2°C | 5.6°C | -1.1°C | 20.2°C | -7.2°C | 51 mm | 58% | 3 m/s | 4.9 |
| 2001 | 12.3°C | 5.7°C | -0.8°C | 25.2°C | -6.8°C | 33 mm | 56% | 2.9 m/s | 5 |
| 2000 | 15.0°C | 7.9°C | 0.8°C | 23.8°C | -5.4°C | 31 mm | 55% | 2.7 m/s | 5.3 |
| 1999 | 10.3°C | 4.2°C | -1.9°C | 19.2°C | -6.4°C | 47 mm | 63% | 2.7 m/s | 5.1 |
| 1998 | 10.8°C | 4.6°C | -1.6°C | 22.2°C | -5.0°C | 36 mm | 64% | 2.2 m/s | 5.3 |
| 1997 | 8.5°C | 2.9°C | -2.7°C | 17.9°C | -9.7°C | 49 mm | 69% | 2.9 m/s | 5.1 |
| 1996 | 11.0°C | 4.5°C | -1.9°C | 23.2°C | -5.1°C | 50 mm | 64% | 3.1 m/s | 4.9 |
| 1995 | 10.0°C | 4.1°C | -1.8°C | 18.3°C | -6.7°C | 48 mm | 66% | 2.9 m/s | 5.4 |
| 1994 | 13.1°C | 6.5°C | -0.1°C | 25.2°C | -6.6°C | 34 mm | 59% | 2.6 m/s | 4.8 |
| 1993 | 9.6°C | 3.7°C | -2.1°C | 15.6°C | -5.2°C | 60 mm | 67% | 3 m/s | 4.7 |
| 1992 | 15.4°C | 8.5°C | 1.6°C | 24.9°C | -4.8°C | 25 mm | 54% | 3.2 m/s | 5.4 |
| 1991 | 9.6°C | 3.9°C | -1.9°C | 19.9°C | -5.4°C | 56 mm | 61% | 3.1 m/s | 4.9 |
| 1990 | 14.7°C | 7.8°C | 1.0°C | 21.0°C | -6.0°C | 54 mm | 58% | 2.5 m/s | 5 |
| 1989 | 13.7°C | 6.7°C | -0.3°C | 23.4°C | -7.6°C | 21 mm | 60% | 2.9 m/s | 5.1 |
| 1988 | 14.2°C | 7.1°C | 0.0°C | 24.2°C | -5.9°C | 45 mm | 55% | 3 m/s | 5.1 |
| 1987 🔥 | 17.5°C | 9.3°C | 1.0°C | 25.7°C | -5.5°C | 13 mm | 48% | 2.8 m/s | 6 |
| 1986 | 11.0°C | 4.8°C | -1.4°C | 21.9°C | -7.4°C | 80 mm | 67% | 2.9 m/s | 4.6 |
| 1985 | 14.2°C | 6.8°C | -0.5°C | 22.1°C | -6.6°C | 13 mm | 56% | 2.9 m/s | 5.6 |
| 1984 | 9.7°C | 3.5°C | -2.7°C | 21.9°C | -5.5°C | 44 mm | 65% | 3 m/s | 4.8 |
| 1983 | 7.8°C | 2.3°C | -3.1°C | 16.6°C | -14.0°C | 39 mm | 68% | 2.5 m/s | — |
| 1982 | 8.5°C | 2.5°C | -3.5°C | 18.4°C | -9.8°C | 38 mm | 62% | 3.2 m/s | — |
| 1981 | 13.6°C | 6.8°C | 0.1°C | 24.1°C | -5.8°C | 41 mm | 57% | 3 m/s | — |
Actual recorded April data for each year, 1981–2025 — sourced from NASA POWER.
The average high in April is around 11.7°C with lows near -1.2°C (mean 5.3°C), based on 45 years of NASA POWER data.
April averages 47 mm of rainfall in Idaho Falls, about average for rainfall. The wettest on record was 99 mm in 2017.
The hottest April reached 27.2°C in 2012. The coldest dipped to -14°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average April temperatures have risen by about 0.3°C. Daytime highs moved from 10.8°C to 11.1°C and overnight lows from -1.9°C to -1.8°C over the same span.
April is one of the cooler months of the year in Idaho Falls and about average for rainfall, so plan for around 11.7°C daytime highs and -1.2°C at night.
Not quite — April is the 6th coolest month in Idaho Falls, averaging 5.3°C.
For April in Idaho Falls, pack warm layers and a jacket for chilly mornings, with typical highs of 11.7°C and lows of -1.2°C.
Relative humidity in April averages 62% — moderately humid.
Average wind speed in April is 2.9 m/s. The windiest April on record averaged 3.3 m/s (2022).
The wettest April on record was 2017 with 99 mm. On average, April sees 47 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 Idaho Falls 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.
