Trenton weather in August: Trenton, New Jersey: normal highs, lows, rain and records for August
Trenton in August has a normal high of 84°F and a normal low of 65°F, a daily mean of 74°F, falling from 86°F on the 1st to 82°F by the 31st. Measurable precipitation falls on 10 days in a normal August, 4.22 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 29°C and low of 18°C, 107 mm of precipitation in August.
- 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 August?
The normal high is 84°F and the normal low 65°F, for a daily mean of 74.4°F. August is 1.9°F cooler than July and 7.0°F warmer than September. August is the 2nd warmest month of the year in Trenton and the 3rd wettest. Across the month the normal high falls 4°F, from 86°F on August 1 to 82°F on August 31. From one year to the next August's mean temperature typically moves about 2.3°F either way (NOAA's standard deviation), so roughly two Augusts in three average between 72°F and 77°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 34%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 86°F | 67°F | 34% | 22% |
| August 8 | 85°F | 66°F | 34% | 22% |
| August 15 | 84°F | 65°F | 32% | 21% |
| August 22 | 83°F | 64°F | 31% | 20% |
| August 31 | 82°F | 62°F | 29% | 19% |
Every day of August: normal high, low and chance of precipitation (warmest afternoon August 1, coldest night August 31)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| August 1 | 86°F | 67°F | 34% | 22% | 14 h 20 min |
| August 2 | 86°F | 67°F | 34% | 22% | 14 h 20 min |
| August 3 | 85°F | 67°F | 34% | 22% | 14 h 20 min |
| August 4 | 85°F | 66°F | 34% | 22% | 14 h 10 min |
| August 5 | 85°F | 66°F | 34% | 22% | 14 h 10 min |
| August 6 | 85°F | 66°F | 34% | 22% | 14 h 10 min |
| August 7 | 85°F | 66°F | 34% | 22% | 14 h 10 min |
| August 8 | 85°F | 66°F | 34% | 22% | 14 h |
| August 9 | 85°F | 66°F | 34% | 22% | 14 h |
| August 10 | 85°F | 66°F | 33% | 22% | 14 h |
| August 11 | 85°F | 66°F | 33% | 21% | 14 h |
| August 12 | 85°F | 66°F | 33% | 21% | 14 h |
| August 13 | 85°F | 65°F | 33% | 21% | 13 h 50 min |
| August 14 | 84°F | 65°F | 33% | 21% | 13 h 50 min |
| August 15 | 84°F | 65°F | 32% | 21% | 13 h 50 min |
| August 16 | 84°F | 65°F | 32% | 21% | 13 h 50 min |
| August 17 | 84°F | 65°F | 32% | 21% | 13 h 40 min |
| August 18 | 84°F | 65°F | 32% | 21% | 13 h 40 min |
| August 19 | 84°F | 65°F | 31% | 20% | 13 h 40 min |
| August 20 | 84°F | 64°F | 31% | 20% | 13 h 40 min |
| August 21 | 84°F | 64°F | 31% | 20% | 13 h 30 min |
| August 22 | 83°F | 64°F | 31% | 20% | 13 h 30 min |
| August 23 | 83°F | 64°F | 30% | 20% | 13 h 30 min |
| August 24 | 83°F | 64°F | 30% | 20% | 13 h 30 min |
| August 25 | 83°F | 64°F | 30% | 20% | 13 h 30 min |
| August 26 | 83°F | 63°F | 30% | 20% | 13 h 20 min |
| August 27 | 83°F | 63°F | 29% | 19% | 13 h 20 min |
| August 28 | 82°F | 63°F | 29% | 19% | 13 h 20 min |
| August 29 | 82°F | 63°F | 29% | 19% | 13 h 20 min |
| August 30 | 82°F | 63°F | 29% | 19% | 13 h 10 min |
| August 31 | 82°F | 62°F | 29% | 19% | 13 h 10 min |
- Normal high
- 84°FAugust average
- Normal low
- 65°FAugust average
- Precipitation
- 4.22 inmonth total
- Days with precipitation
- 100.01 inch or more
- Days at 90°F or more
- 6
- Daylight
- 14 h 20 min to 13 h 10 minAugust 1 to August 31
- Days at 70°F or more
- 31
- Days at 80°F or more
- 25
- Sunshine
- 78%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 August?
On a given August day the chance of 0.01 inch or more is 32% on average, highest around August 1 (34%). In all, 4.22 in falls on 10 days of a normal August, 1 of them with an inch or more.
In a normal August in Trenton, 6 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00014792.
What are the records for August in Trenton?
The warmest August temperature on Trenton's official record (since 1865) is 105°F, on August 7, 1918; the coldest is 39°F, on August 29, 1986. The wettest August brought 15.69 in (2011).
The August mean against the 1991-2020 normal of 74.4°F: 2021 76.5°F (+2.0), 2022 77.4°F (+3.0), 2023 73.1°F (−1.3), 2024 73.8°F (−0.6), 2025 71.0°F (−3.4), 2026 75.2°F (+0.8). 3 of 6 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 76.5°F | +2.0°F | 5.06 in |
| 2022 | 77.4°F | +3.0°F | 3.16 in |
| 2023 | 73.1°F | −1.3°F | 4.01 in |
| 2024 | 73.8°F | −0.6°F | 7.37 in |
| 2025 | 71.0°F | −3.4°F | 0.82 in |
| 2026 | 75.2°F | +0.8°F | 7.70 in |
Source: records: ACIS, NWS threaded record TTNthr; recent months: ACIS, station USW00014792. Records and recent months use complete months only.
How does August in Trenton compare across New Jersey?
Across the 33 places PlainClimate covers in New Jersey, August normal highs run from 82°F in Andover to 87°F in Lambertville; Trenton's is 84°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.