Twin Falls weather in May: Twin Falls, Idaho: normal highs, lows, rain and records for May
Twin Falls in May has a normal high of 69°F and a normal low of 42°F, a daily mean of 55°F, rising from 64°F on the 1st to 73°F by the 31st. Measurable precipitation falls on 9 days in a normal May, 1.46 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 20°C and low of 6°C, 37 mm of precipitation in May.
- NOAA stationTwin Falls Sun Valley Regional Airport
- Station IDUSW00094178
- Location42.48°N 114.49°W
- Elevation4,151 ft (1,265 m)
- Population55,589
- Jan 37° 21°
- Feb 42° 24°
- Mar 52° 30°
- Apr 59° 34°
- May 69° 42°
- Jun 78° 49°
- Jul 88° 58°
- Aug 87° 56°
- Sep 76° 47°
- Oct 62° 36°
- Nov 47° 26°
- Dec 37° 20°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Twin Falls in May?
The normal high is 69°F and the normal low 42°F, for a daily mean of 55.4°F. May is 8.9°F warmer than April and 8.4°F cooler than June. May is the 5th warmest month of the year in Twin Falls and the wettest. Across the month the normal high rises 9°F, from 64°F on May 1 to 73°F on May 31. From one year to the next May's mean temperature typically moves about 3.1°F either way (NOAA's standard deviation), so roughly two Mays in three average between 52°F and 59°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 28%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| May 1 | 64°F | 38°F | 27% | 13% |
| May 8 | 66°F | 40°F | 27% | 13% |
| May 15 | 69°F | 42°F | 28% | 13% |
| May 22 | 71°F | 44°F | 28% | 13% |
| May 31 | 73°F | 46°F | 26% | 12% |
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 | 64°F | 38°F | 27% | 13% | 14 h |
| May 2 | 64°F | 38°F | 27% | 13% | 14 h |
| May 3 | 64°F | 39°F | 27% | 13% | 14 h 10 min |
| May 4 | 65°F | 39°F | 27% | 13% | 14 h 10 min |
| May 5 | 65°F | 39°F | 27% | 13% | 14 h 10 min |
| May 6 | 65°F | 40°F | 27% | 13% | 14 h 10 min |
| May 7 | 66°F | 40°F | 27% | 13% | 14 h 20 min |
| May 8 | 66°F | 40°F | 27% | 13% | 14 h 20 min |
| May 9 | 67°F | 40°F | 27% | 13% | 14 h 20 min |
| May 10 | 67°F | 41°F | 28% | 13% | 14 h 20 min |
| May 11 | 67°F | 41°F | 28% | 13% | 14 h 30 min |
| May 12 | 68°F | 41°F | 28% | 13% | 14 h 30 min |
| May 13 | 68°F | 42°F | 28% | 13% | 14 h 30 min |
| May 14 | 68°F | 42°F | 28% | 13% | 14 h 30 min |
| May 15 | 69°F | 42°F | 28% | 13% | 14 h 30 min |
| May 16 | 69°F | 42°F | 28% | 13% | 14 h 40 min |
| May 17 | 69°F | 43°F | 28% | 13% | 14 h 40 min |
| May 18 | 70°F | 43°F | 28% | 13% | 14 h 40 min |
| May 19 | 70°F | 43°F | 28% | 13% | 14 h 40 min |
| May 20 | 70°F | 43°F | 28% | 13% | 14 h 40 min |
| May 21 | 71°F | 44°F | 28% | 13% | 14 h 50 min |
| May 22 | 71°F | 44°F | 28% | 13% | 14 h 50 min |
| May 23 | 71°F | 44°F | 28% | 12% | 14 h 50 min |
| May 24 | 71°F | 44°F | 28% | 12% | 14 h 50 min |
| May 25 | 72°F | 45°F | 28% | 12% | 14 h 50 min |
| May 26 | 72°F | 45°F | 28% | 12% | 14 h 50 min |
| May 27 | 72°F | 45°F | 27% | 12% | 15 h |
| May 28 | 72°F | 45°F | 27% | 12% | 15 h |
| May 29 | 73°F | 45°F | 27% | 12% | 15 h |
| May 30 | 73°F | 46°F | 26% | 12% | 15 h |
| May 31 | 73°F | 46°F | 26% | 12% | 15 h |
- Normal high
- 69°FMay average
- Normal low
- 42°FMay average
- Precipitation
- 1.46 inmonth total
- Days with precipitation
- 90.01 inch or more
- Days at 90°F or more
- 1
- Nights at 32°F or colder
- 2
- Daylight
- 14 h to 15 hMay 1 to May 31
- Days at 70°F or more
- 15
- Days at 80°F or more
- 6
- Sunshine
- 80%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00094178; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Twin Falls in May?
On a given May day the chance of 0.01 inch or more is 27% on average, highest around May 20 (28%). In all, 1.46 in falls on 9 days of a normal May.
In a normal May in Twin Falls, 1 days reach 90°F and 2 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00094178.
What are the records for May in Twin Falls?
The warmest May temperature on this station's record (since 1997) is 100°F, on May 28, 2003; the coldest is 24°F, on May 8, 2002. The wettest May brought 3.89 in (1998).
The May mean against the 1991-2020 normal of 55.4°F: 2021 55.5°F (+0.1), 2022 51.6°F (−3.8), 2023 59.5°F (+4.1), 2024 53.5°F (−1.9), 2025 59.2°F (+3.8), 2026 59.9°F (+4.5). 4 of 6 ran warmer than normal.
| May | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 55.5°F | +0.1°F | 0.74 in |
| 2022 | 51.6°F | −3.8°F | 1.70 in |
| 2023 | 59.5°F | +4.1°F | 1.93 in |
| 2024 | 53.5°F | −1.9°F | 0.81 in |
| 2025 | 59.2°F | +3.8°F | 0.55 in |
| 2026 | 59.9°F | +4.5°F | 0.06 in |
Source: records: ACIS, station USW00094178; recent months: ACIS, station USW00094178. Records and recent months use complete months only.
How does May in Twin 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; Twin Falls's is 69°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.