Idaho Falls weather in August: Idaho Falls, Idaho: normal highs, lows, rain and records for August
Idaho Falls in August has a normal high of 86°F and a normal low of 48°F, a daily mean of 67°F, falling from 89°F on the 1st to 81°F by the 31st. Measurable precipitation falls on 5 days in a normal August, 0.59 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 30°C and low of 9°C, 15 mm of precipitation in August.
- NOAA stationIdaho Falls Fanning Field
- Station IDUSW00024145
- Location43.52°N 112.07°W
- Elevation4,729 ft (1,441 m)
- Population69,523
- Jan 29° 12°
- Feb 34° 16°
- Mar 47° 25°
- Apr 58° 31°
- May 67° 38°
- Jun 76° 45°
- Jul 87° 49°
- Aug 86° 48°
- Sep 75° 41°
- Oct 59° 31°
- Nov 43° 22°
- Dec 30° 13°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Idaho Falls in August?
The normal high is 86°F and the normal low 48°F, for a daily mean of 66.5°F. August is 1.5°F cooler than July and 8.8°F warmer than September. August is the 2nd warmest month of the year in Idaho Falls and the 10th wettest. Across the month the normal high falls 8°F, from 89°F on August 1 to 81°F on August 31. From one year to the next August's mean temperature typically moves about 1.9°F either way (NOAA's standard deviation), so roughly two Augusts in three average between 65°F and 68°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 16%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 89°F | 50°F | 15% | 6% |
| August 8 | 88°F | 49°F | 16% | 6% |
| August 15 | 86°F | 48°F | 15% | 6% |
| August 22 | 84°F | 46°F | 15% | 7% |
| August 31 | 81°F | 44°F | 16% | 7% |
Every day of August: normal high, low and chance of precipitation (warmest afternoon August 1, coldest night August 31)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| August 1 | 89°F | 50°F | 15% | 6% | 14 h 40 min |
| August 2 | 89°F | 50°F | 15% | 6% | 14 h 30 min |
| August 3 | 89°F | 50°F | 15% | 6% | 14 h 30 min |
| August 4 | 89°F | 50°F | 16% | 6% | 14 h 30 min |
| August 5 | 88°F | 50°F | 16% | 6% | 14 h 30 min |
| August 6 | 88°F | 50°F | 16% | 6% | 14 h 20 min |
| August 7 | 88°F | 49°F | 16% | 6% | 14 h 20 min |
| August 8 | 88°F | 49°F | 16% | 6% | 14 h 20 min |
| August 9 | 88°F | 49°F | 16% | 6% | 14 h 20 min |
| August 10 | 87°F | 49°F | 15% | 6% | 14 h 10 min |
| August 11 | 87°F | 49°F | 15% | 6% | 14 h 10 min |
| August 12 | 87°F | 48°F | 15% | 6% | 14 h 10 min |
| August 13 | 87°F | 48°F | 15% | 6% | 14 h 10 min |
| August 14 | 87°F | 48°F | 15% | 6% | 14 h |
| August 15 | 86°F | 48°F | 15% | 6% | 14 h |
| August 16 | 86°F | 48°F | 15% | 6% | 14 h |
| August 17 | 86°F | 47°F | 15% | 6% | 14 h |
| August 18 | 85°F | 47°F | 15% | 6% | 13 h 50 min |
| August 19 | 85°F | 47°F | 15% | 6% | 13 h 50 min |
| August 20 | 85°F | 47°F | 15% | 7% | 13 h 50 min |
| August 21 | 85°F | 47°F | 15% | 7% | 13 h 50 min |
| August 22 | 84°F | 46°F | 15% | 7% | 13 h 40 min |
| August 23 | 84°F | 46°F | 15% | 7% | 13 h 40 min |
| August 24 | 84°F | 46°F | 15% | 7% | 13 h 40 min |
| August 25 | 83°F | 46°F | 15% | 7% | 13 h 30 min |
| August 26 | 83°F | 46°F | 15% | 7% | 13 h 30 min |
| August 27 | 83°F | 45°F | 16% | 7% | 13 h 30 min |
| August 28 | 82°F | 45°F | 16% | 7% | 13 h 30 min |
| August 29 | 82°F | 45°F | 16% | 7% | 13 h 20 min |
| August 30 | 82°F | 45°F | 16% | 7% | 13 h 20 min |
| August 31 | 81°F | 44°F | 16% | 7% | 13 h 20 min |
- Normal high
- 86°FAugust average
- Normal low
- 48°FAugust average
- Precipitation
- 0.59 inmonth total
- Days with precipitation
- 50.01 inch or more
- Days at 90°F or more
- 10
- Daylight
- 14 h 40 min to 13 h 20 minAugust 1 to August 31
- Days at 70°F or more
- 30
- Days at 80°F or more
- 26
- Sunshine
- 89%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00024145; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Idaho Falls in August?
On a given August day the chance of 0.01 inch or more is 15% on average, highest around August 31 (16%). In all, 0.59 in falls on 5 days of a normal August.
In a normal August in Idaho Falls, 10 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00024145.
What are the records for August in Idaho Falls?
The warmest August temperature on this station's record (since 1948) is 101°F, on August 1, 2026; the coldest is 28°F, on August 26, 1992. The wettest August brought 2.59 in (1968).
The August mean against the 1991-2020 normal of 66.5°F: 2021 66.0°F (−0.5), 2022 71.9°F (+5.4), 2023 69.5°F (+3.0), 2024 69.0°F (+2.5), 2025 68.7°F (+2.2), 2026 69.9°F (+3.4). 5 of 6 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 66.0°F | −0.5°F | 1.85 in |
| 2022 | 71.9°F | +5.4°F | 0.62 in |
| 2023 | 69.5°F | +3.0°F | 1.15 in |
| 2024 | 69.0°F | +2.5°F | 0.32 in |
| 2025 | 68.7°F | +2.2°F | 0.93 in |
| 2026 | 69.9°F | +3.4°F | 0.43 in |
Source: records: ACIS, station USW00024145; recent months: ACIS, station USW00024145. Records and recent months use complete months only.
How does August in Idaho Falls compare across Idaho?
Across the 85 places PlainClimate covers in Idaho, August normal highs run from 69°F in Mullan to 97°F in Glenns Ferry; Idaho Falls's is 86°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.