Quincy weather in May: Quincy, Illinois: normal highs, lows, rain and records for May
Quincy 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, 4.55 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 23°C and low of 12°C, 116 mm of precipitation in May.
- NOAA stationQuincy Regional Airport
- Station IDUSW00093989
- Location39.94°N 91.19°W
- Elevation769 ft (234 m)
- From the center10 miles
- Population38,786
- Jan 35° 19°
- Feb 40° 23°
- Mar 52° 32°
- Apr 64° 43°
- May 73° 54°
- Jun 82° 63°
- Jul 86° 67°
- Aug 85° 65°
- Sep 78° 56°
- Oct 65° 45°
- Nov 51° 33°
- Dec 39° 24°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Quincy in May?
The normal high is 73°F and the normal low 54°F, for a daily mean of 63.6°F. May is 10.3°F warmer than April and 9.2°F cooler than June. May is the 5th warmest month of the year in Quincy and the 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 3.2°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 41%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| May 1 | 69°F | 49°F | 41% | 26% |
| May 8 | 71°F | 51°F | 41% | 26% |
| May 15 | 73°F | 54°F | 41% | 25% |
| May 22 | 75°F | 56°F | 40% | 25% |
| May 31 | 78°F | 59°F | 38% | 24% |
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 | 41% | 26% | 13 h 50 min |
| May 2 | 69°F | 49°F | 41% | 26% | 13 h 50 min |
| May 3 | 69°F | 49°F | 41% | 26% | 14 h |
| May 4 | 70°F | 50°F | 41% | 26% | 14 h |
| May 5 | 70°F | 50°F | 41% | 26% | 14 h |
| May 6 | 70°F | 50°F | 41% | 26% | 14 h |
| May 7 | 71°F | 51°F | 41% | 26% | 14 h |
| May 8 | 71°F | 51°F | 41% | 26% | 14 h 10 min |
| May 9 | 71°F | 52°F | 41% | 26% | 14 h 10 min |
| May 10 | 71°F | 52°F | 41% | 26% | 14 h 10 min |
| May 11 | 72°F | 52°F | 41% | 26% | 14 h 10 min |
| May 12 | 72°F | 53°F | 41% | 26% | 14 h 20 min |
| May 13 | 72°F | 53°F | 41% | 26% | 14 h 20 min |
| May 14 | 73°F | 53°F | 41% | 26% | 14 h 20 min |
| May 15 | 73°F | 54°F | 41% | 25% | 14 h 20 min |
| May 16 | 73°F | 54°F | 41% | 25% | 14 h 20 min |
| May 17 | 74°F | 54°F | 41% | 25% | 14 h 20 min |
| May 18 | 74°F | 55°F | 40% | 25% | 14 h 30 min |
| May 19 | 74°F | 55°F | 40% | 25% | 14 h 30 min |
| May 20 | 75°F | 55°F | 40% | 25% | 14 h 30 min |
| May 21 | 75°F | 56°F | 40% | 25% | 14 h 30 min |
| May 22 | 75°F | 56°F | 40% | 25% | 14 h 30 min |
| May 23 | 76°F | 56°F | 40% | 25% | 14 h 40 min |
| May 24 | 76°F | 57°F | 40% | 25% | 14 h 40 min |
| May 25 | 76°F | 57°F | 40% | 25% | 14 h 40 min |
| May 26 | 77°F | 57°F | 39% | 25% | 14 h 40 min |
| May 27 | 77°F | 58°F | 39% | 25% | 14 h 40 min |
| May 28 | 77°F | 58°F | 39% | 24% | 14 h 40 min |
| May 29 | 78°F | 58°F | 39% | 24% | 14 h 40 min |
| May 30 | 78°F | 59°F | 38% | 24% | 14 h 50 min |
| May 31 | 78°F | 59°F | 38% | 24% | 14 h 50 min |
- Normal high
- 73°FMay average
- Normal low
- 54°FMay average
- Precipitation
- 4.55 inmonth total
- Days with precipitation
- 130.01 inch or more
- Days at 90°F or more
- 1
- 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
- 9
- Sunshine
- 73%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00093989; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Quincy in May?
On a given May day the chance of 0.01 inch or more is 40% on average, highest around May 6 (41%). In all, 4.55 in falls on 13 days of a normal May, 1 of them with an inch or more.
In a normal May in Quincy, 1 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00093989.
What are the records for May in Quincy?
The warmest May temperature on Quincy's official record (since 1901) is 103°F, on May 30, 1934; the coldest is 26°F, on May 4, 1907. The wettest May brought 13.70 in (1935).
The May mean against the 1991-2020 normal of 63.6°F: 2021 61.5°F (−2.1), 2022 65.8°F (+2.1), 2023 65.7°F (+2.1), 2024 67.6°F (+4.0), 2025 63.5°F (−0.1), 2026 63.9°F (+0.3). 4 of 6 ran warmer than normal.
| May | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 61.5°F | −2.1°F | 4.83 in |
| 2022 | 65.8°F | +2.1°F | 3.23 in |
| 2023 | 65.7°F | +2.1°F | 2.09 in |
| 2024 | 67.6°F | +4.0°F | 4.81 in |
| 2025 | 63.5°F | −0.1°F | 3.36 in |
| 2026 | 63.9°F | +0.3°F | 2.74 in |
Source: records: ACIS, NWS threaded record UINthr; recent months: ACIS, station USW00093989. Records and recent months use complete months only.
How does May in Quincy compare across Illinois?
Across the 144 places PlainClimate covers in Illinois, May normal highs run from 67°F in Waukegan to 79°F in Belleville; Quincy's is 73°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.