Trenton weather in May: Trenton, New Jersey: normal highs, lows, rain and records for May
Trenton in May has a normal high of 72°F and a normal low of 52°F, a daily mean of 62°F, rising from 69°F on the 1st to 76°F by the 31st. Measurable precipitation falls on 12 days in a normal May, 3.99 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 22°C and low of 11°C, 101 mm of precipitation in May.
- NOAA stationTrenton-Mercer Airport
- Station IDUSW00014792
- Location40.28°N 74.82°W
- Elevation184 ft (56 m)
- From the center5 miles
- Population91,193
- Jan 40° 24°
- Feb 43° 26°
- Mar 51° 33°
- Apr 63° 42°
- May 72° 52°
- Jun 81° 61°
- Jul 86° 67°
- Aug 84° 65°
- Sep 77° 58°
- Oct 66° 46°
- Nov 55° 36°
- Dec 44° 29°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Trenton in May?
The normal high is 72°F and the normal low 52°F, for a daily mean of 62.0°F. May is 9.5°F warmer than April and 9.0°F cooler than June. May is the 5th warmest month of the year in Trenton and the 7th wettest. Across the month the normal high rises 7°F, from 69°F on May 1 to 76°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 59°F and 65°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 | 47°F | 38% | 22% |
| May 8 | 70°F | 49°F | 38% | 22% |
| May 15 | 72°F | 51°F | 39% | 23% |
| May 22 | 74°F | 53°F | 40% | 24% |
| May 31 | 76°F | 56°F | 41% | 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 | 69°F | 47°F | 38% | 22% | 13 h 50 min |
| May 2 | 69°F | 47°F | 38% | 22% | 14 h |
| May 3 | 69°F | 48°F | 38% | 22% | 14 h |
| May 4 | 69°F | 48°F | 38% | 22% | 14 h |
| May 5 | 70°F | 48°F | 38% | 22% | 14 h |
| May 6 | 70°F | 49°F | 38% | 22% | 14 h |
| May 7 | 70°F | 49°F | 38% | 22% | 14 h 10 min |
| May 8 | 70°F | 49°F | 38% | 22% | 14 h 10 min |
| May 9 | 71°F | 50°F | 39% | 22% | 14 h 10 min |
| May 10 | 71°F | 50°F | 39% | 22% | 14 h 10 min |
| May 11 | 71°F | 50°F | 39% | 23% | 14 h 10 min |
| May 12 | 71°F | 50°F | 39% | 23% | 14 h 20 min |
| May 13 | 72°F | 51°F | 39% | 23% | 14 h 20 min |
| May 14 | 72°F | 51°F | 39% | 23% | 14 h 20 min |
| May 15 | 72°F | 51°F | 39% | 23% | 14 h 20 min |
| May 16 | 72°F | 52°F | 39% | 23% | 14 h 20 min |
| May 17 | 73°F | 52°F | 40% | 23% | 14 h 30 min |
| May 18 | 73°F | 52°F | 40% | 24% | 14 h 30 min |
| May 19 | 73°F | 53°F | 40% | 24% | 14 h 30 min |
| May 20 | 73°F | 53°F | 40% | 24% | 14 h 30 min |
| May 21 | 74°F | 53°F | 40% | 24% | 14 h 30 min |
| May 22 | 74°F | 53°F | 40% | 24% | 14 h 40 min |
| May 23 | 74°F | 54°F | 40% | 24% | 14 h 40 min |
| May 24 | 74°F | 54°F | 40% | 24% | 14 h 40 min |
| May 25 | 75°F | 54°F | 40% | 24% | 14 h 40 min |
| May 26 | 75°F | 55°F | 40% | 24% | 14 h 40 min |
| May 27 | 75°F | 55°F | 41% | 24% | 14 h 40 min |
| May 28 | 75°F | 55°F | 41% | 25% | 14 h 40 min |
| May 29 | 76°F | 56°F | 41% | 25% | 14 h 50 min |
| May 30 | 76°F | 56°F | 41% | 25% | 14 h 50 min |
| May 31 | 76°F | 56°F | 41% | 25% | 14 h 50 min |
- Normal high
- 72°FMay average
- Normal low
- 52°FMay average
- Precipitation
- 3.99 inmonth total
- Days with precipitation
- 120.01 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
- 20
- Days at 80°F or more
- 8
- Sunshine
- 70%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00014792; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Trenton in May?
On a given May day the chance of 0.01 inch or more is 39% on average, highest around May 31 (41%). In all, 3.99 in falls on 12 days of a normal May, 1 of them with an inch or more.
In a normal May in Trenton, 1 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00014792.
What are the records for May in Trenton?
The warmest May temperature on Trenton's official record (since 1865) is 99°F, on May 23, 1911; the coldest is 31°F, on May 9, 1985. The wettest May brought 10.75 in (1894).
The May mean against the 1991-2020 normal of 62.0°F: 2021 60.8°F (−1.2), 2022 63.5°F (+1.5), 2023 59.4°F (−2.6), 2024 63.6°F (+1.6), 2025 62.0°F (at normal), 2026 61.8°F (−0.2). 2 of 6 ran warmer than normal.
| May | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 60.8°F | −1.2°F | 3.12 in |
| 2022 | 63.5°F | +1.5°F | 7.17 in |
| 2023 | 59.4°F | −2.6°F | 0.61 in |
| 2024 | 63.6°F | +1.6°F | 3.10 in |
| 2025 | 62.0°F | at normal | 6.97 in |
| 2026 | 61.8°F | −0.2°F | 3.17 in |
Source: records: ACIS, NWS threaded record TTNthr; recent months: ACIS, station USW00014792. Records and recent months use complete months only.
How does May in Trenton compare across New Jersey?
Across the 33 places PlainClimate covers in New Jersey, May normal highs run from 68°F in Long Branch to 76°F in Belleplain; Trenton's is 72°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.