Idaho Falls weather in May: Idaho Falls, Idaho: normal highs, lows, rain and records for May
Idaho Falls in May has a normal high of 67°F and a normal low of 38°F, a daily mean of 53°F, rising from 62°F on the 1st to 72°F by the 31st. Measurable precipitation falls on 9 days in a normal May, 1.57 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 20°C and low of 4°C, 40 mm of precipitation in May.
- 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 May?
The normal high is 67°F and the normal low 38°F, for a daily mean of 52.8°F. May is 8.4°F warmer than April and 7.6°F cooler than June. May is the 5th warmest month of the year in Idaho Falls and the wettest. Across the month the normal high rises 10°F, from 62°F on May 1 to 72°F on May 31. From one year to the next May's mean temperature typically moves about 2.4°F either way (NOAA's standard deviation), so roughly two Mays in three average between 50°F and 55°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 30%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| May 1 | 62°F | 34°F | 28% | 12% |
| May 8 | 65°F | 36°F | 29% | 13% |
| May 15 | 67°F | 38°F | 29% | 14% |
| May 22 | 69°F | 40°F | 30% | 14% |
| May 31 | 72°F | 42°F | 28% | 14% |
Every day of May: normal high, low and chance of precipitation (warmest afternoon May 31, coldest night May 1)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| May 1 | 62°F | 34°F | 28% | 12% | 14 h 10 min |
| May 2 | 63°F | 34°F | 28% | 12% | 14 h 10 min |
| May 3 | 63°F | 35°F | 28% | 12% | 14 h 10 min |
| May 4 | 63°F | 35°F | 28% | 12% | 14 h 10 min |
| May 5 | 64°F | 35°F | 28% | 12% | 14 h 20 min |
| May 6 | 64°F | 36°F | 29% | 13% | 14 h 20 min |
| May 7 | 64°F | 36°F | 29% | 13% | 14 h 20 min |
| May 8 | 65°F | 36°F | 29% | 13% | 14 h 20 min |
| May 9 | 65°F | 36°F | 29% | 13% | 14 h 30 min |
| May 10 | 65°F | 37°F | 29% | 13% | 14 h 30 min |
| May 11 | 66°F | 37°F | 29% | 13% | 14 h 30 min |
| May 12 | 66°F | 37°F | 29% | 13% | 14 h 30 min |
| May 13 | 66°F | 38°F | 29% | 14% | 14 h 40 min |
| May 14 | 67°F | 38°F | 29% | 14% | 14 h 40 min |
| May 15 | 67°F | 38°F | 29% | 14% | 14 h 40 min |
| May 16 | 67°F | 39°F | 29% | 14% | 14 h 40 min |
| May 17 | 68°F | 39°F | 29% | 14% | 14 h 40 min |
| May 18 | 68°F | 39°F | 29% | 14% | 14 h 50 min |
| May 19 | 68°F | 39°F | 29% | 14% | 14 h 50 min |
| May 20 | 69°F | 40°F | 29% | 14% | 14 h 50 min |
| May 21 | 69°F | 40°F | 30% | 14% | 14 h 50 min |
| May 22 | 69°F | 40°F | 30% | 14% | 14 h 50 min |
| May 23 | 69°F | 41°F | 29% | 14% | 15 h |
| May 24 | 70°F | 41°F | 29% | 14% | 15 h |
| May 25 | 70°F | 41°F | 29% | 14% | 15 h |
| May 26 | 70°F | 41°F | 29% | 14% | 15 h |
| May 27 | 71°F | 41°F | 29% | 14% | 15 h |
| May 28 | 71°F | 42°F | 29% | 14% | 15 h |
| May 29 | 71°F | 42°F | 28% | 14% | 15 h 10 min |
| May 30 | 71°F | 42°F | 28% | 14% | 15 h 10 min |
| May 31 | 72°F | 42°F | 28% | 14% | 15 h 10 min |
- Normal high
- 67°FMay average
- Normal low
- 38°FMay average
- Precipitation
- 1.57 inmonth total
- Days with precipitation
- 90.01 inch or more
- Nights at 32°F or colder
- 6
- Daylight
- 14 h 10 min to 15 h 10 minMay 1 to May 31
- Days at 70°F or more
- 14
- Days at 80°F or more
- 4
- Sunshine
- 79%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 May?
On a given May day the chance of 0.01 inch or more is 29% on average, highest around May 21 (30%). In all, 1.57 in falls on 9 days of a normal May.
In a normal May in Idaho Falls, 6 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00024145.
What are the records for May in Idaho Falls?
The warmest May temperature on this station's record (since 1948) is 94°F, on May 29, 2003; the coldest is 17°F, on May 5, 1982. The wettest May brought 4.33 in (1981); the snowiest, 10.4 inches (1955).
The May mean against the 1991-2020 normal of 52.8°F: 2021 52.8°F (at normal), 2022 50.6°F (−2.2), 2023 57.7°F (+4.9), 2024 51.5°F (−1.3), 2025 56.2°F (+3.4), 2026 54.6°F (+1.9). 3 of 6 ran warmer than normal.
| May | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 52.8°F | at normal | 1.36 in |
| 2022 | 50.6°F | −2.2°F | 0.99 in |
| 2023 | 57.7°F | +4.9°F | 1.97 in |
| 2024 | 51.5°F | −1.3°F | 0.88 in |
| 2025 | 56.2°F | +3.4°F | 1.51 in |
| 2026 | 54.6°F | +1.9°F | 1.70 in |
Source: records: ACIS, station USW00024145; recent months: ACIS, station USW00024145. Records and recent months use complete months only.
How does May in Idaho Falls compare across Idaho?
Across the 85 places PlainClimate covers in Idaho, May normal highs run from 50°F in Mullan to 79°F in Glenns Ferry; Idaho Falls's is 67°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.