July is one of the warmer months of the year in Idaho Falls, with average highs near 29.5°C and lows around 13.3°C (mean 21.4°C). It is one of the drier months, averaging 24 mm of rainfall and 42% relative humidity across the period.
July is one of the warmer months of the year in Idaho Falls. Across 45 years of records, the warmest July in Idaho Falls was 2003 — when the month averaged 24.9°C — while the coldest was 1993 at 15°C. Typical July days reach 29.5°C with nights near 13.3°C. The long-term trend is warming, about 0.6°C per decade.
July is one of the drier months in Idaho Falls, averaging 24 mm of rainfall. The wettest July on record was 1987 with 63 mm, while the driest was 1988 at 2 mm.
Relative humidity in Idaho Falls during July averages 42%. The most humid July was 1997 at 54%, and the least humid was 1988 at 26%.
July receives about 7.5 kWh/m²/day of solar energy in Idaho Falls. The sunniest July was 2003 at 8.2 kWh/m²/day, and the cloudiest were 1987, 1993 and 2015, among others at 6.8.
Average wind speed in Idaho Falls during July is 2.3 m/s. The windiest July was 1983 at 2.9 m/s, while the calmest were 1985, 2017 and 2021, among others at 1.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 20.5°C | 19.9°C | 22.6°C | 21.4°C | 22.7°C | +2.2°C |
| Avg High | 28.6°C | 28.0°C | 31.0°C | 29.4°C | 30.8°C | +2.2°C |
| Avg Low | 12.5°C | 11.8°C | 14.3°C | 13.5°C | 14.7°C | +2.2°C |
| Avg Rain | 36 mm | 28 mm | 16 mm | 22 mm | 17 mm | -19 mm |
July temperatures in Idaho Falls have risen by about 2.9°C between 1981–1985 and 2021–2025.
July has ranged from a record low of 2.4°C (1983) to a record high of 39.1°C (2002).
Rainfall in July is one of the drier months, averaging 24 mm, with a wettest year of 63 mm.
One of the best times to visit Idaho Falls
July is one of the best times to visit Idaho Falls. Expect days averaging 29.5°C and nights around 13.3°C (mean 21.4°C) — warmer than Idaho Falls's yearly average — with low rainfall (24 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 30.7°C | 22.6°C | 14.5°C | 34.7°C | 11.2°C | 17 mm | 36% | 2.6 m/s | 7.5 |
| 2024 | 30.2°C | 22.5°C | 14.7°C | 35.8°C | 7.9°C | 13 mm | 43% | 2 m/s | 7.5 |
| 2023 | 30.3°C | 22.3°C | 14.4°C | 35.4°C | 8.4°C | 19 mm | 44% | 2.2 m/s | 7.8 |
| 2022 | 32.4°C | 24.0°C | 15.6°C | 36.5°C | 11.9°C | 5 mm | 34% | 2.3 m/s | 7.8 |
| 2021 | 32.7°C | 24.7°C | 16.8°C | 36.3°C | 13.6°C | 28 mm | 38% | 1.9 m/s | 7.1 |
| 2020 | 28.2°C | 20.1°C | 12.0°C | 34.4°C | 5.7°C | 20 mm | 45% | 2.3 m/s | 8 |
| 2019 | 29.1°C | 21.5°C | 13.9°C | 34.5°C | 8.6°C | 15 mm | 48% | 2.4 m/s | 7.5 |
| 2018 | 29.5°C | 21.7°C | 13.8°C | 33.2°C | 5.9°C | 7 mm | 47% | 2.1 m/s | 7.7 |
| 2017 | 29.7°C | 22.3°C | 14.8°C | 32.8°C | 9.0°C | 21 mm | 50% | 1.9 m/s | 7.5 |
| 2016 | 29.2°C | 20.9°C | 12.6°C | 34.3°C | 4.6°C | 25 mm | 39% | 2.7 m/s | 7.9 |
| 2015 | 26.1°C | 19.2°C | 12.4°C | 33.8°C | 5.1°C | 46 mm | 52% | 2 m/s | 6.8 |
| 2014 | 30.5°C | 22.1°C | 13.7°C | 34.1°C | 7.5°C | 22 mm | 42% | 2.3 m/s | 7.6 |
| 2013 | 31.7°C | 23.4°C | 15.1°C | 35.2°C | 12.9°C | 21 mm | 38% | 2.3 m/s | 7.2 |
| 2012 | 30.7°C | 22.7°C | 14.6°C | 34.8°C | 10.6°C | 27 mm | 43% | 2.2 m/s | 7.1 |
| 2011 | 28.6°C | 20.5°C | 12.3°C | 32.3°C | 7.1°C | 18 mm | 48% | 2.6 m/s | 7.7 |
| 2010 | 28.5°C | 20.1°C | 11.6°C | 33.5°C | 5.1°C | 18 mm | 42% | 2.3 m/s | 8.1 |
| 2009 | 27.9°C | 20.1°C | 12.2°C | 34.1°C | 6.5°C | 22 mm | 48% | 2 m/s | 7.6 |
| 2008 | 30.7°C | 22.0°C | 13.3°C | 34.7°C | 7.8°C | 7 mm | 36% | 2.4 m/s | 8 |
| 2007 | 33.2°C | 24.7°C | 16.3°C | 36.9°C | 12.8°C | 19 mm | 36% | 2 m/s | 7.4 |
| 2006 | 31.4°C | 23.2°C | 15.1°C | 35.7°C | 11.3°C | 20 mm | 42% | 2 m/s | 7.4 |
| 2005 | 30.2°C | 21.8°C | 13.4°C | 35.7°C | 7.1°C | 9 mm | 40% | 2.5 m/s | 8 |
| 2004 | 29.3°C | 21.3°C | 13.2°C | 34.7°C | 6.8°C | 24 mm | 43% | 2.1 m/s | 7.6 |
| 2003 🔥 | 33.6°C | 24.9°C | 16.2°C | 37.8°C | 10.7°C | 6 mm | 28% | 2.3 m/s | 8.2 |
| 2002 | 32.4°C | 23.6°C | 14.8°C | 39.1°C | 10.1°C | 18 mm | 33% | 2.5 m/s | 7.5 |
| 2001 | 30.2°C | 22.2°C | 14.2°C | 36.2°C | 9.6°C | 24 mm | 36% | 2.5 m/s | 7.4 |
| 2000 | 31.1°C | 22.6°C | 14.1°C | 37.1°C | 9.0°C | 14 mm | 32% | 2.4 m/s | 7.7 |
| 1999 | 28.5°C | 20.1°C | 11.7°C | 33.4°C | 6.0°C | 15 mm | 41% | 2.6 m/s | 7.9 |
| 1998 | 30.3°C | 22.2°C | 14.1°C | 34.8°C | 10.5°C | 23 mm | 47% | 2.1 m/s | 8.1 |
| 1997 | 26.0°C | 18.6°C | 11.1°C | 32.5°C | 4.5°C | 59 mm | 54% | 2.2 m/s | 7.1 |
| 1996 | 29.3°C | 21.0°C | 12.7°C | 33.3°C | 8.4°C | 22 mm | 43% | 2.2 m/s | 7.8 |
| 1995 | 26.7°C | 19.0°C | 11.3°C | 33.1°C | 6.1°C | 35 mm | 49% | 2.7 m/s | 7.6 |
| 1994 | 30.0°C | 21.4°C | 12.9°C | 35.3°C | 5.1°C | 15 mm | 32% | 2.3 m/s | 7.5 |
| 1993 ❄️ | 22.2°C | 15.0°C | 7.8°C | 29.6°C | 4.2°C | 60 mm | 51% | 2.6 m/s | 6.8 |
| 1992 | 26.9°C | 18.9°C | 10.9°C | 32.6°C | 4.6°C | 28 mm | 39% | 2.4 m/s | 7.2 |
| 1991 | 29.9°C | 21.4°C | 12.9°C | 33.2°C | 6.8°C | 13 mm | 39% | 2.3 m/s | 7 |
| 1990 | 29.9°C | 21.5°C | 13.1°C | 34.1°C | 8.8°C | 10 mm | 36% | 2.3 m/s | 7.1 |
| 1989 | 31.5°C | 22.9°C | 14.3°C | 35.8°C | 10.2°C | 11 mm | 35% | 2.3 m/s | 7.3 |
| 1988 | 31.9°C | 23.1°C | 14.2°C | 35.1°C | 7.0°C | 2 mm | 26% | 2.6 m/s | 7.6 |
| 1987 🌧️ | 26.7°C | 19.2°C | 11.6°C | 32.7°C | 5.4°C | 63 mm | 47% | 2.4 m/s | 6.8 |
| 1986 | 26.5°C | 18.4°C | 10.4°C | 32.6°C | 2.9°C | 28 mm | 43% | 2.8 m/s | 6.8 |
| 1985 | 30.4°C | 22.5°C | 14.7°C | 35.4°C | 9.1°C | 44 mm | 40% | 1.9 m/s | 7 |
| 1984 | 28.0°C | 20.3°C | 12.7°C | 32.5°C | 7.0°C | 58 mm | 51% | 1.9 m/s | 7.1 |
| 1983 | 26.6°C | 18.8°C | 10.9°C | 32.9°C | 2.4°C | 50 mm | 47% | 2.9 m/s | — |
| 1982 | 26.1°C | 18.8°C | 11.5°C | 33.5°C | 5.3°C | 50 mm | 53% | 2.3 m/s | — |
| 1981 | 29.8°C | 20.9°C | 12.0°C | 35.0°C | 3.6°C | 14 mm | 32% | 2.5 m/s | — |
Actual recorded July data for each year, 1981–2025 — sourced from NASA POWER.
The average high in July is around 29.5°C with lows near 13.3°C (mean 21.4°C), based on 45 years of NASA POWER data.
July averages 24 mm of rainfall in Idaho Falls, one of the drier months. The wettest on record was 63 mm in 1987.
The hottest July reached 39.1°C in 2002. The coldest dipped to 2.4°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average July temperatures have risen by about 2.9°C. Daytime highs moved from 28.2°C to 31.3°C and overnight lows from 12.4°C to 15.2°C over the same span.
July is one of the warmer months of the year in Idaho Falls and one of the drier months, so plan for around 29.5°C daytime highs and 13.3°C at night.
Not quite — July is the 12th coolest month in Idaho Falls, averaging 21.4°C.
For July in Idaho Falls, pack light layers you can adjust through the day, with typical highs of 29.5°C and lows of 13.3°C.
Relative humidity in July averages 42% — relatively dry.
Average wind speed in July is 2.3 m/s. The windiest July on record averaged 2.9 m/s (1983).
The wettest July on record was 1987 with 63 mm. On average, July sees 24 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 July, 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 July specifically, along with year-by-year records and how the month has changed over the decades.
