Trenton weather in July: Trenton, New Jersey: normal highs, lows, rain and records for July
Trenton in July has a normal high of 86°F and a normal low of 67°F, a daily mean of 76°F, holding near 86°F all month. Measurable precipitation falls on 11 days in a normal July, 4.42 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 30°C and low of 19°C, 112 mm of precipitation in July.
- 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 July?
The normal high is 86°F and the normal low 67°F, for a daily mean of 76.3°F. July is 5.3°F warmer than June and 1.9°F warmer than August. July is the warmest month of the year in Trenton and the wettest. Across the month the normal high rises 1°F, from 85°F on July 1 to 86°F on July 31. From one year to the next July's mean temperature typically moves about 2.5°F either way (NOAA's standard deviation), so roughly two Julys in three average between 74°F and 79°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 37%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| July 1 | 85°F | 65°F | 37% | 23% |
| July 8 | 86°F | 66°F | 36% | 23% |
| July 15 | 86°F | 67°F | 35% | 22% |
| July 22 | 86°F | 67°F | 35% | 22% |
| July 31 | 86°F | 67°F | 34% | 22% |
Every day of July: normal high, low and chance of precipitation (warmest afternoon July 16, coldest night July 1)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| July 1 | 85°F | 65°F | 37% | 23% | 15 h |
| July 2 | 85°F | 65°F | 36% | 23% | 15 h |
| July 3 | 85°F | 65°F | 36% | 23% | 15 h |
| July 4 | 86°F | 66°F | 36% | 23% | 15 h |
| July 5 | 86°F | 66°F | 36% | 23% | 15 h |
| July 6 | 86°F | 66°F | 36% | 23% | 15 h |
| July 7 | 86°F | 66°F | 36% | 23% | 15 h |
| July 8 | 86°F | 66°F | 36% | 23% | 15 h |
| July 9 | 86°F | 66°F | 35% | 22% | 14 h 50 min |
| July 10 | 86°F | 67°F | 35% | 22% | 14 h 50 min |
| July 11 | 86°F | 67°F | 35% | 22% | 14 h 50 min |
| July 12 | 86°F | 67°F | 35% | 22% | 14 h 50 min |
| July 13 | 86°F | 67°F | 35% | 22% | 14 h 50 min |
| July 14 | 86°F | 67°F | 35% | 22% | 14 h 50 min |
| July 15 | 86°F | 67°F | 35% | 22% | 14 h 50 min |
| July 16 | 86°F | 67°F | 35% | 22% | 14 h 50 min |
| July 17 | 86°F | 67°F | 35% | 22% | 14 h 40 min |
| July 18 | 86°F | 67°F | 35% | 22% | 14 h 40 min |
| July 19 | 86°F | 67°F | 35% | 22% | 14 h 40 min |
| July 20 | 86°F | 67°F | 35% | 22% | 14 h 40 min |
| July 21 | 86°F | 67°F | 35% | 22% | 14 h 40 min |
| July 22 | 86°F | 67°F | 35% | 22% | 14 h 40 min |
| July 23 | 86°F | 67°F | 35% | 22% | 14 h 40 min |
| July 24 | 86°F | 67°F | 35% | 22% | 14 h 30 min |
| July 25 | 86°F | 67°F | 35% | 22% | 14 h 30 min |
| July 26 | 86°F | 67°F | 35% | 22% | 14 h 30 min |
| July 27 | 86°F | 67°F | 35% | 22% | 14 h 30 min |
| July 28 | 86°F | 67°F | 35% | 22% | 14 h 30 min |
| July 29 | 86°F | 67°F | 35% | 22% | 14 h 20 min |
| July 30 | 86°F | 67°F | 34% | 22% | 14 h 20 min |
| July 31 | 86°F | 67°F | 34% | 22% | 14 h 20 min |
- Normal high
- 86°FJuly average
- Normal low
- 67°FJuly average
- Precipitation
- 4.42 inmonth total
- Days with precipitation
- 110.01 inch or more
- Days at 90°F or more
- 9
- Daylight
- 15 h to 14 h 20 minJuly 1 to July 31
- Days at 70°F or more
- 31
- Days at 80°F or more
- 28
- Sunshine
- 80%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 July?
On a given July day the chance of 0.01 inch or more is 35% on average, highest around July 1 (37%). In all, 4.42 in falls on 11 days of a normal July, 1 of them with an inch or more.
In a normal July in Trenton, 9 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00014792.
What are the records for July in Trenton?
The warmest July temperature on Trenton's official record (since 1865) is 106°F, on July 9, 1936; the coldest is 46°F, on July 1, 1988. The wettest July brought 15.12 in (1880).
The July mean against the 1991-2020 normal of 76.3°F: 2021 75.7°F (−0.6), 2022 78.9°F (+2.6), 2023 77.2°F (+0.9), 2024 79.0°F (+2.7), 2025 78.3°F (+2.0), 2026 76.4°F (+0.1). 5 of 6 ran warmer than normal.
| July | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 75.7°F | −0.6°F | 6.37 in |
| 2022 | 78.9°F | +2.6°F | 1.07 in |
| 2023 | 77.2°F | +0.9°F | 5.69 in |
| 2024 | 79.0°F | +2.7°F | 3.02 in |
| 2025 | 78.3°F | +2.0°F | 4.94 in |
| 2026 | 76.4°F | +0.1°F | 4.93 in |
Source: records: ACIS, NWS threaded record TTNthr; recent months: ACIS, station USW00014792. Records and recent months use complete months only.
How does July in Trenton compare across New Jersey?
Across the 33 places PlainClimate covers in New Jersey, July normal highs run from 84°F in Long Branch to 89°F in Woodstown; Trenton's is 86°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.