Indianapolis weather in May: Indianapolis, Indiana: normal highs, lows, rain and records for May
Indianapolis in May has a normal high of 73°F and a normal low of 54°F, a daily mean of 64°F, rising from 69°F on the 1st to 78°F by the 31st. Measurable precipitation falls on 13 days in a normal May, 4.75 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 23°C and low of 12°C, 121 mm of precipitation in May.
- NOAA stationIndianapolis International Airport
- Station IDUSW00093819
- Location39.71°N 86.28°W
- Elevation790 ft (241 m)
- From the center9 miles
- Population891,484
- Jan 36° 21°
- Feb 41° 24°
- Mar 52° 33°
- Apr 64° 43°
- May 73° 54°
- Jun 82° 63°
- Jul 85° 66°
- Aug 84° 65°
- Sep 78° 57°
- Oct 66° 46°
- Nov 52° 35°
- Dec 40° 26°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Indianapolis in May?
The normal high is 73°F and the normal low 54°F, for a daily mean of 63.6°F. May is 10.0°F warmer than April and 8.9°F cooler than June. May is the 5th warmest month of the year in Indianapolis and the 2nd wettest. Across the month the normal high rises 9°F, from 69°F on May 1 to 78°F on May 31. From one year to the next May's mean temperature typically moves about 3.4°F either way (NOAA's standard deviation), so roughly two Mays in three average between 60°F and 67°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 42%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| May 1 | 69°F | 49°F | 42% | 29% |
| May 8 | 71°F | 51°F | 42% | 29% |
| May 15 | 73°F | 53°F | 42% | 28% |
| May 22 | 75°F | 56°F | 41% | 28% |
| May 31 | 78°F | 59°F | 40% | 27% |
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 | 69°F | 49°F | 42% | 29% | 13 h 50 min |
| May 2 | 69°F | 49°F | 42% | 29% | 13 h 50 min |
| May 3 | 70°F | 50°F | 42% | 29% | 14 h |
| May 4 | 70°F | 50°F | 42% | 29% | 14 h |
| May 5 | 70°F | 50°F | 42% | 29% | 14 h |
| May 6 | 71°F | 51°F | 42% | 29% | 14 h |
| May 7 | 71°F | 51°F | 42% | 29% | 14 h |
| May 8 | 71°F | 51°F | 42% | 29% | 14 h 10 min |
| May 9 | 71°F | 51°F | 42% | 29% | 14 h 10 min |
| May 10 | 72°F | 52°F | 42% | 29% | 14 h 10 min |
| May 11 | 72°F | 52°F | 42% | 29% | 14 h 10 min |
| May 12 | 72°F | 52°F | 42% | 29% | 14 h 10 min |
| May 13 | 73°F | 53°F | 42% | 29% | 14 h 20 min |
| May 14 | 73°F | 53°F | 42% | 28% | 14 h 20 min |
| May 15 | 73°F | 53°F | 42% | 28% | 14 h 20 min |
| May 16 | 73°F | 54°F | 42% | 28% | 14 h 20 min |
| May 17 | 74°F | 54°F | 42% | 28% | 14 h 20 min |
| May 18 | 74°F | 54°F | 42% | 28% | 14 h 30 min |
| May 19 | 74°F | 55°F | 41% | 28% | 14 h 30 min |
| May 20 | 75°F | 55°F | 41% | 28% | 14 h 30 min |
| May 21 | 75°F | 55°F | 41% | 28% | 14 h 30 min |
| May 22 | 75°F | 56°F | 41% | 28% | 14 h 30 min |
| May 23 | 75°F | 56°F | 41% | 27% | 14 h 30 min |
| May 24 | 76°F | 56°F | 41% | 27% | 14 h 40 min |
| May 25 | 76°F | 57°F | 41% | 27% | 14 h 40 min |
| May 26 | 76°F | 57°F | 41% | 27% | 14 h 40 min |
| May 27 | 77°F | 57°F | 40% | 27% | 14 h 40 min |
| May 28 | 77°F | 58°F | 40% | 27% | 14 h 40 min |
| May 29 | 77°F | 58°F | 40% | 27% | 14 h 40 min |
| May 30 | 78°F | 58°F | 40% | 27% | 14 h 40 min |
| May 31 | 78°F | 59°F | 40% | 27% | 14 h 50 min |
- Normal high
- 73°FMay average
- Normal low
- 54°FMay average
- Precipitation
- 4.75 inmonth total
- Days with precipitation
- 130.01 inch or more
- Daylight
- 13 h 50 min to 14 h 50 minMay 1 to May 31
- Days at 70°F or more
- 21
- Days at 80°F or more
- 10
- Sunshine
- 72%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00093819; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Indianapolis in May?
On a given May day the chance of 0.01 inch or more is 41% on average, highest around May 8 (42%). In all, 4.75 in falls on 13 days of a normal May, 1 of them with an inch or more.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00093819.
How humid and windy is Indianapolis in May?
At 3 p.m. the normal temperature is 76°F with 52% relative humidity and a dew point of 57°F; at 6 a.m. it is 60°F with 85% humidity. The wind averages 9.0 mph, most often from the southwest in the afternoon.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 60°F | 56°F | 85% | 6.8 mph | – |
| 9 a.m. | 68°F | 58°F | 70% | 9.3 mph | 29% |
| noon | 73°F | 58°F | 58% | 11.0 mph | – |
| 3 p.m. | 76°F | 57°F | 52% | 11.4 mph | – |
| 6 p.m. | 74°F | 57°F | 54% | 10.8 mph | – |
| 9 p.m. | 69°F | 57°F | 66% | 8.1 mph | – |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00093819. 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 Indianapolis?
The warmest May temperature on Indianapolis's official record (since 1871) is 96°F, on May 31, 1895; the coldest is 27°F, on May 9, 2020. The wettest May brought 10.10 in (1943); the snowiest, 2.4 inches (1897).
The May mean against the 1991-2020 normal of 63.6°F: 2021 60.9°F (−2.8), 2022 66.1°F (+2.5), 2023 64.5°F (+0.9), 2024 68.3°F (+4.7), 2025 62.4°F (−1.2), 2026 62.0°F (−1.6). 3 of 6 ran warmer than normal.
| May | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 60.9°F | −2.8°F | 3.57 in |
| 2022 | 66.1°F | +2.5°F | 3.77 in |
| 2023 | 64.5°F | +0.9°F | 2.84 in |
| 2024 | 68.3°F | +4.7°F | 5.26 in |
| 2025 | 62.4°F | −1.2°F | 4.42 in |
| 2026 | 62.0°F | −1.6°F | 6.93 in |
Source: records: ACIS, NWS threaded record INDthr; recent months: ACIS, station USW00093819. Records and recent months use complete months only.
How does May in Indianapolis compare across Indiana?
Across the 99 places PlainClimate covers in Indiana, May normal highs run from 69°F in Angola to 79°F in Boonville; Indianapolis's is 73°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.