Trenton weather by month
Average highs run from 40°F in January to 86°F in July, and January nights average 24°F. It gets 46 inches of rain and melted snow a year and 27 inches of snow. Nights drop below freezing about 97 times a year. The most comfortable months are April to October.
Best time to visit Trenton
For comfortable weather, go in April to October. In those months the average high stays between 62°F and 86°F, nights average 42°F or warmer, and rain stays under 4.5 inches for the month.
Month by month
| Month | High | Low | Precip. | Snow | Wet days | Days 90°F+ | Nights below 32°F | Feels |
|---|---|---|---|---|---|---|---|---|
| January | 40°F | 24°F | 3.3 in | 8.2 in | 6 | 0 | 25 | cold |
| February | 43°F | 26°F | 2.7 in | 8.7 in | 6 | 0 | 22 | cold |
| March | 51°F | 33°F | 4.0 in | 4.0 in | 7 | 0 | 15 | cool |
| April | 63°F | 42°F | 3.6 in | 0.5 in | 6 | 0 | 3 | mild |
| May | 72°F | 52°F | 4.0 in | 0.0 in | 7 | 1 | 0 | mild |
| June | 81°F | 61°F | 4.4 in | 0.0 in | 8 | 4 | 0 | warm |
| July | 86°F | 67°F | 4.4 in | 0.0 in | 7 | 9 | 0 | warm |
| August | 84°F | 65°F | 4.2 in | 0.0 in | 6 | 6 | 0 | warm |
| September | 77°F | 58°F | 4.1 in | 0.0 in | 6 | 2 | 0 | warm |
| October | 66°F | 46°F | 3.8 in | 0.1 in | 6 | 0 | 1 | mild |
| November | 55°F | 36°F | 3.2 in | 0.5 in | 6 | 0 | 10 | cool |
| December | 44°F | 29°F | 4.0 in | 4.6 in | 7 | 0 | 22 | cold |
| Year | 63°F avg | 45°F avg | 45.6 in | 26.6 in | 77 | 22 | 97 |
"Wet days" are days with at least 0.1 inch of precipitation. "Feels" is a plain-language label for the average high. Normals for 1991-2020 from NOAA NCEI, station Trenton Mercer Co Airport, NJ (USW00014792), 5.5 miles from the city center. Averages describe typical conditions, not a forecast.
Sunrise, sunset and daylight in Trenton
The shortest day is December 21, with 9h 17m of daylight; the longest is June 21, with 15h 02m. The earliest sunset comes around December 2 (4:32 pm) and the latest around June 22 (8:32 pm). The sun sets after 8 pm on 97 days a year.
| On the 15th of | Sunrise | Sunset | Daylight |
|---|---|---|---|
| January | 7:19 am | 4:57 pm | 9h 37m |
| February | 6:52 am | 5:34 pm | 10h 42m |
| March | 7:10 am | 7:05 pm | 11h 55m |
| April | 6:20 am | 7:37 pm | 13h 17m |
| May | 5:43 am | 8:07 pm | 14h 25m |
| June | 5:28 am | 8:30 pm | 15h 01m |
| July | 5:42 am | 8:27 pm | 14h 45m |
| August | 6:10 am | 7:55 pm | 13h 45m |
| September | 6:40 am | 7:07 pm | 12h 27m |
| October | 7:09 am | 6:18 pm | 11h 09m |
| November | 6:44 am | 4:41 pm | 9h 57m |
| December | 7:14 am | 4:33 pm | 9h 19m |
Calculated for 2026 at the center of Trenton with NOAA's solar equations, in local clock time (Eastern Time, including daylight saving time where it applies). Times shift by a minute or two from year to year.
Is Trenton getting warmer?
The last 10 years averaged 3.2°F warmer than the 20th century. See the climate stripes for Trenton.Frequently asked questions
What is the warmest month in Trenton?
July is the warmest month, with an average high of 86°F and an average low of 67°F (NOAA 1991-2020 normals).
What is the coldest month in Trenton?
January is the coldest, with average lows of 24°F and highs of 40°F.
What is the rainiest month in Trenton?
July gets the most precipitation, 4.4 inches on average. February is the driest at 2.7 inches.
Does it snow in Trenton?
Yes. Trenton averages 27 inches of snow a year.
When is the best time to visit Trenton?
For comfortable weather, April to October. Those months average highs between 62 and 86°F with lows of 42°F or more and modest rain.
Thinking of moving to Trenton?
See what homes, rent and everyday prices cost, who lives there and how it compares with nearby cities on the full Trenton profile.
Compare the weather: Trenton vs Philadelphia, Trenton vs Elizabeth, Trenton vs Newark, Trenton vs Bethlehem.