Custer weather in May: Custer, South Dakota: normal highs, lows, rain and records for May
Custer in May has a normal high of 60°F and a normal low of 38°F, a daily mean of 49°F, rising from 54°F on the 1st to 65°F by the 31st. Measurable precipitation falls on 14 days in a normal May, 2.97 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 15°C and low of 3°C, 75 mm of precipitation in May.
- NOAA stationCuster County Airport
- Station IDUSW00094032
- Location43.73°N 103.61°W
- Elevation5,545 ft (1,690 m)
- Population1,829
- Jan 35° 15°
- Feb 35° 15°
- Mar 44° 22°
- Apr 50° 29°
- May 60° 38°
- Jun 71° 47°
- Jul 79° 54°
- Aug 78° 52°
- Sep 69° 43°
- Oct 54° 32°
- Nov 43° 22°
- Dec 35° 16°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Custer in May?
The normal high is 60°F and the normal low 38°F, for a daily mean of 48.6°F. May is 9.3°F warmer than April and 10.3°F cooler than June. May is the 5th warmest month of the year in Custer and the 3rd wettest. Across the month the normal high rises 11°F, from 54°F on May 1 to 65°F on May 31. From one year to the next May's mean temperature typically moves about 2.9°F either way (NOAA's standard deviation), so roughly two Mays in three average between 46°F and 52°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 47%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| May 1 | 54°F | 32°F | 43% | 23% |
| May 8 | 57°F | 35°F | 45% | 24% |
| May 15 | 59°F | 37°F | 46% | 25% |
| May 22 | 62°F | 40°F | 47% | 25% |
| May 31 | 65°F | 42°F | 46% | 25% |
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 | 54°F | 32°F | 43% | 23% | 14 h 10 min |
| May 2 | 55°F | 33°F | 43% | 23% | 14 h 10 min |
| May 3 | 55°F | 33°F | 43% | 23% | 14 h 10 min |
| May 4 | 55°F | 33°F | 44% | 23% | 14 h 20 min |
| May 5 | 56°F | 34°F | 44% | 23% | 14 h 20 min |
| May 6 | 56°F | 34°F | 44% | 24% | 14 h 20 min |
| May 7 | 56°F | 34°F | 44% | 24% | 14 h 20 min |
| May 8 | 57°F | 35°F | 45% | 24% | 14 h 20 min |
| May 9 | 57°F | 35°F | 45% | 24% | 14 h 30 min |
| May 10 | 58°F | 36°F | 45% | 24% | 14 h 30 min |
| May 11 | 58°F | 36°F | 45% | 24% | 14 h 30 min |
| May 12 | 58°F | 36°F | 45% | 24% | 14 h 30 min |
| May 13 | 59°F | 37°F | 45% | 25% | 14 h 40 min |
| May 14 | 59°F | 37°F | 46% | 25% | 14 h 40 min |
| May 15 | 59°F | 37°F | 46% | 25% | 14 h 40 min |
| May 16 | 60°F | 38°F | 46% | 25% | 14 h 40 min |
| May 17 | 60°F | 38°F | 46% | 25% | 14 h 50 min |
| May 18 | 60°F | 38°F | 46% | 25% | 14 h 50 min |
| May 19 | 61°F | 39°F | 46% | 25% | 14 h 50 min |
| May 20 | 61°F | 39°F | 46% | 25% | 14 h 50 min |
| May 21 | 61°F | 39°F | 47% | 25% | 14 h 50 min |
| May 22 | 62°F | 40°F | 47% | 25% | 15 h |
| May 23 | 62°F | 40°F | 47% | 25% | 15 h |
| May 24 | 62°F | 40°F | 47% | 25% | 15 h |
| May 25 | 63°F | 41°F | 47% | 25% | 15 h |
| May 26 | 63°F | 41°F | 47% | 25% | 15 h |
| May 27 | 64°F | 41°F | 47% | 25% | 15 h |
| May 28 | 64°F | 42°F | 46% | 25% | 15 h 10 min |
| May 29 | 64°F | 42°F | 46% | 25% | 15 h 10 min |
| May 30 | 65°F | 42°F | 46% | 25% | 15 h 10 min |
| May 31 | 65°F | 42°F | 46% | 25% | 15 h 10 min |
- Normal high
- 60°FMay average
- Normal low
- 38°FMay average
- Precipitation
- 2.97 inmonth total
- Days with precipitation
- 140.01 inch or more
- Nights at 32°F or colder
- 10
- Daylight
- 14 h 10 min to 15 h 10 minMay 1 to May 31
- Days at 70°F or more
- 6
- Days at 80°F or more
- 1
- Sunshine
- 73%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00094032; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Custer in May?
On a given May day the chance of 0.01 inch or more is 45% on average, highest around May 22 (47%). In all, 2.97 in falls on 14 days of a normal May.
In a normal May in Custer, 10 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00094032.
How humid and windy is Custer in May?
At 3 p.m. the normal temperature is 62°F with 46% relative humidity and a dew point of 41°F; at 6 a.m. it is 49°F with 72% humidity. The wind averages 6.9 mph, most often from the south-southwest in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 49°F | 41°F | 72% | 5.0 mph | – |
| 9 a.m. | 58°F | 40°F | 52% | 8.2 mph | – |
| noon | 61°F | 41°F | 46% | 9.6 mph | – |
| 3 p.m. | 62°F | 41°F | 46% | 9.8 mph | – |
| 6 p.m. | 58°F | 41°F | 53% | 7.8 mph | – |
| 9 p.m. | 51°F | 41°F | 69% | 5.2 mph | – |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00094032. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for May in Custer?
The warmest May temperature on this station's record (since 1999) is 88°F, on May 29, 2003; the coldest is 12°F, on May 2, 2005. The wettest May brought 6.60 in (2015).
The May mean against the 1991-2020 normal of 48.6°F: 2021 47.1°F (−1.5), 2022 47.5°F (−1.1), 2023 53.2°F (+4.6), 2024 47.3°F (−1.3), 2025 50.8°F (+2.2), 2026 50.1°F (+1.5). 3 of 6 ran warmer than normal.
| May | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 47.1°F | −1.5°F | 3.44 in |
| 2022 | 47.5°F | −1.1°F | 3.08 in |
| 2023 | 53.2°F | +4.6°F | 4.68 in |
| 2024 | 47.3°F | −1.3°F | 4.00 in |
| 2025 | 50.8°F | +2.2°F | 2.60 in |
| 2026 | 50.1°F | +1.5°F | 3.27 in |
Source: records: ACIS, station USW00094032; recent months: ACIS, station USW00094032. Records and recent months use complete months only.
How does May in Custer compare across South Dakota?
Across the 100 places PlainClimate covers in South Dakota, May normal highs run from 60°F in Custer to 73°F in Wagner; Custer's is 60°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.