Trenton weather in September
In September, Trenton sees average daytime highs of 77°F and overnight lows near 60°F, with 4.0 in of rain across 9.2 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 6th-wettest month of the year here.
Highs ease over the month, from about 81°F in the first days to 73°F by the end. The sky is clear or mostly clear about 35% of the time in September, and the air most often feels dry.
Daylight stretches from about 12 h 54 min at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Trenton's 2nd-clearest and 9th-windiest month. For the whole year in context, see Trenton's year-round climate.
- Daytime high
- 77°
- 4th warmest
- Overnight low
- 60°
- 9th coldest
- Rainfall
- 4.0 in
- 9.2 wet days
- Daylight
- 12 h 18 min
- 5:45 AM – 6:01 PM
- Cloud cover
- 56%
- 2nd clearest
- Wind
- 6 mph
- 9th windiest
- Solar energy
- 4.21 kWh/m²
- Travel score
- 6.9
- out of 10
Trenton is capital city of the U.S. state of New Jersey and seat of Mercer County.
- Density
- 4,218/km²
- people per km²
- Founded
- 1719
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in September
Highs ease over the month, from about 81°F in the first days to 73°F by the end.
A typical September day in Trenton reaches about 77°F in the afternoon and slips back to 60°F overnight — a 17°F spread between the day's warmth and the night's chill. On most days the high lands between 68°F and 86°F. Set against its neighbours, September runs about 7°F cooler than August and about 12°F warmer than October.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 82 | 81 | 81 | 81 | 81 | 80 | 80 | 80 | 79 | 79 | 79 | 78 | 78 | 78 | 77 | 77 | 77 | 76 | 76 | 76 | 75 | 75 | 74 | 74 | 74 | 73 | 73 | 73 | 72 | 72 |
| Avg low (°F) | 65 | 64 | 64 | 64 | 64 | 63 | 63 | 63 | 62 | 62 | 62 | 61 | 61 | 60 | 60 | 60 | 59 | 59 | 59 | 58 | 58 | 58 | 57 | 57 | 56 | 56 | 56 | 55 | 55 | 55 |
| Avg high (°F) | Avg low (°F) | |
|---|---|---|
| 1 | 82 | 65 |
| 2 | 81 | 64 |
| 3 | 81 | 64 |
| 4 | 81 | 64 |
| 5 | 81 | 64 |
| 6 | 80 | 63 |
| 7 | 80 | 63 |
| 8 | 80 | 63 |
| 9 | 79 | 62 |
| 10 | 79 | 62 |
| 11 | 79 | 62 |
| 12 | 78 | 61 |
| 13 | 78 | 61 |
| 14 | 78 | 60 |
| 15 | 77 | 60 |
| 16 | 77 | 60 |
| 17 | 77 | 59 |
| 18 | 76 | 59 |
| 19 | 76 | 59 |
| 20 | 76 | 58 |
| 21 | 75 | 58 |
| 22 | 75 | 58 |
| 23 | 74 | 57 |
| 24 | 74 | 57 |
| 25 | 74 | 56 |
| 26 | 73 | 56 |
| 27 | 73 | 56 |
| 28 | 73 | 55 |
| 29 | 72 | 55 |
| 30 | 72 | 55 |
How September really feels in Trenton
Once humidity and wind are folded in, September averages 0 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.
September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Trenton weather by month
How September compares with the rest of the year at a glance. September is the 4th-warmest and 6th-wettest month here — the current month is highlighted below.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 40° / 27° | 3.3 | 9.3 | 3.8 | 9.5 | 0.0 |
| Feb | 43° / 28° | 3.0 | 8.8 | 3.4 | 10.4 | 0.5 |
| Mar | 51° / 35° | 4.2 | 10.3 | 2.6 | 11.7 | 2.5 |
| Apr | 63° / 45° | 3.6 | 10.6 | 0.3 | 13 | 5.2 |
| May | 72° / 54° | 3.5 | 11.4 | 0 | 14.2 | 6.4 |
| Jun | 81° / 63° | 4.0 | 10.8 | 0 | 14.8 | 6.0 |
| Jul | 86° / 69° | 4.2 | 11.3 | 0 | 14.6 | 4.9 |
| Aug | 84° / 67° | 4.0 | 10.4 | 0 | 13.6 | 5.6 |
| Sep | 77° / 60° | 4.0 | 9.2 | 0 | 12.3 | 6.9 |
| Oct | 65° / 49° | 3.6 | 8.4 | 0.1 | 10.9 | 6.2 |
| Nov | 54° / 39° | 2.9 | 7.8 | 0.3 | 9.8 | 3.5 |
| Dec | 45° / 31° | 4.0 | 9.4 | 1.9 | 9.2 | 1.0 |
Cloud cover in September
The sky is clear or mostly clear about 35% of the time in September.
Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 49%. Skies tend to open up as the month goes on.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 53 | 52 | 53 | 53 | 53 | 53 | 53 | 53 | 54 | 54 | 54 | 52 | 52 | 53 | 52 | 52 | 51 | 50 | 50 | 50 | 49 | 49 | 49 | 49 | 48 | 49 | 49 | 50 | 50 | 50 |
| Cloudier (%) | 47 | 48 | 47 | 47 | 47 | 47 | 47 | 47 | 46 | 46 | 46 | 48 | 48 | 47 | 48 | 48 | 49 | 50 | 50 | 50 | 51 | 51 | 51 | 51 | 52 | 51 | 51 | 50 | 50 | 50 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 53 | 47 |
| 2 | 52 | 48 |
| 3 | 53 | 47 |
| 4 | 53 | 47 |
| 5 | 53 | 47 |
| 6 | 53 | 47 |
| 7 | 53 | 47 |
| 8 | 53 | 47 |
| 9 | 54 | 46 |
| 10 | 54 | 46 |
| 11 | 54 | 46 |
| 12 | 52 | 48 |
| 13 | 52 | 48 |
| 14 | 53 | 47 |
| 15 | 52 | 48 |
| 16 | 52 | 48 |
| 17 | 51 | 49 |
| 18 | 50 | 50 |
| 19 | 50 | 50 |
| 20 | 50 | 50 |
| 21 | 49 | 51 |
| 22 | 49 | 51 |
| 23 | 49 | 51 |
| 24 | 49 | 51 |
| 25 | 48 | 52 |
| 26 | 49 | 51 |
| 27 | 49 | 51 |
| 28 | 50 | 50 |
| 29 | 50 | 50 |
| 30 | 50 | 50 |
Chance of precipitation in September
Trenton gets around 4.0 in of rain over 9.2 wet days in September. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 30% and peaks near 31% on the wettest days.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 28 | 28 | 28 | 28 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 30 | 30 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 |
| Rain chance (%) | |
|---|---|
| 1 | 28 |
| 2 | 28 |
| 3 | 28 |
| 4 | 28 |
| 5 | 29 |
| 6 | 29 |
| 7 | 29 |
| 8 | 29 |
| 9 | 29 |
| 10 | 29 |
| 11 | 29 |
| 12 | 29 |
| 13 | 29 |
| 14 | 29 |
| 15 | 29 |
| 16 | 29 |
| 17 | 29 |
| 18 | 29 |
| 19 | 30 |
| 20 | 30 |
| 21 | 31 |
| 22 | 31 |
| 23 | 31 |
| 24 | 31 |
| 25 | 31 |
| 26 | 31 |
| 27 | 31 |
| 28 | 31 |
| 29 | 31 |
| 30 | 31 |
Humidity in September
Most of September feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, September lands in the dry band about 38% of days. Sticky, muggy-or-worse air turns up on roughly 21% of them.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 22 | 23 | 24 | 24 | 25 | 26 | 27 | 28 | 30 | 31 | 32 | 33 | 34 | 36 | 37 | 38 | 40 | 41 | 42 | 43 | 45 | 46 | 47 | 49 | 51 | 52 | 54 | 54 | 55 | 57 |
| Comfortable (%) | 21 | 22 | 22 | 22 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 22 | 22 | 22 | 22 | 21 | 21 | 21 | 21 | 20 | 20 | 20 | 20 | 20 | 19 | 19 | 19 | 19 | 18 | 18 |
| Humid (%) | 22 | 22 | 22 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 20 | 20 | 19 | 19 | 18 | 18 | 17 | 16 | 16 | 15 | 15 | 15 | 14 |
| Muggy (%) | 21 | 21 | 20 | 20 | 19 | 18 | 18 | 17 | 16 | 16 | 16 | 15 | 15 | 15 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 13 | 13 | 13 | 12 | 12 | 11 | 11 | 11 | 10 |
| Oppressive (%) | 13 | 13 | 13 | 12 | 12 | 12 | 11 | 11 | 10 | 9 | 9 | 8 | 7 | 7 | 6 | 5 | 5 | 4 | 4 | 3 | 3 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | |
|---|---|---|---|---|---|
| 1 | 22 | 21 | 22 | 21 | 13 |
| 2 | 23 | 22 | 22 | 21 | 13 |
| 3 | 24 | 22 | 22 | 20 | 13 |
| 4 | 24 | 22 | 21 | 20 | 12 |
| 5 | 25 | 23 | 21 | 19 | 12 |
| 6 | 26 | 23 | 21 | 18 | 12 |
| 7 | 27 | 23 | 21 | 18 | 11 |
| 8 | 28 | 23 | 21 | 17 | 11 |
| 9 | 30 | 23 | 21 | 16 | 10 |
| 10 | 31 | 23 | 21 | 16 | 9 |
| 11 | 32 | 23 | 21 | 16 | 9 |
| 12 | 33 | 22 | 21 | 15 | 8 |
| 13 | 34 | 22 | 21 | 15 | 7 |
| 14 | 36 | 22 | 21 | 15 | 7 |
| 15 | 37 | 22 | 21 | 14 | 6 |
| 16 | 38 | 21 | 21 | 14 | 5 |
| 17 | 40 | 21 | 21 | 14 | 5 |
| 18 | 41 | 21 | 20 | 14 | 4 |
| 19 | 42 | 21 | 20 | 14 | 4 |
| 20 | 43 | 20 | 19 | 14 | 3 |
| 21 | 45 | 20 | 19 | 14 | 3 |
| 22 | 46 | 20 | 18 | 13 | 2 |
| 23 | 47 | 20 | 18 | 13 | 2 |
| 24 | 49 | 20 | 17 | 13 | 2 |
| 25 | 51 | 19 | 16 | 12 | 2 |
| 26 | 52 | 19 | 16 | 12 | 1 |
| 27 | 54 | 19 | 15 | 11 | 1 |
| 28 | 54 | 19 | 15 | 11 | 1 |
| 29 | 55 | 18 | 15 | 11 | 1 |
| 30 | 57 | 18 | 14 | 10 | 1 |
Wind in September
Winds average 6 mph in September.
Across September, daily wind ranges from about 6 mph on the calmest days to 6 mph at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (mph) | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (mph) | Feels | |
|---|---|---|
| 1 | 6 | calm |
| 2 | 6 | calm |
| 3 | 6 | calm |
| 4 | 6 | calm |
| 5 | 6 | calm |
| 6 | 6 | calm |
| 7 | 6 | calm |
| 8 | 6 | calm |
| 9 | 6 | calm |
| 10 | 6 | calm |
| 11 | 6 | calm |
| 12 | 6 | calm |
| 13 | 6 | calm |
| 14 | 6 | calm |
| 15 | 6 | calm |
| 16 | 6 | calm |
| 17 | 6 | calm |
| 18 | 6 | calm |
| 19 | 6 | calm |
| 20 | 6 | calm |
| 21 | 6 | calm |
| 22 | 6 | calm |
| 23 | 6 | calm |
| 24 | 6 | calm |
| 25 | 6 | calm |
| 26 | 6 | calm |
| 27 | 6 | calm |
| 28 | 6 | calm |
| 29 | 6 | calm |
| 30 | 6 | calm |
Sunrise & sunset in September
Daylight runs from about 12 h 54 min at the start of September to 11 h 36 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 78 minutes over September. Sunrise moves from 5:31 AM to 6:00 AM, and sunset from 6:27 PM to 5:37 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 12.9 | 12.9 | 12.8 | 12.8 | 12.8 | 12.7 | 12.7 | 12.6 | 12.6 | 12.5 | 12.5 | 12.4 | 12.4 | 12.4 | 12.3 | 12.3 | 12.2 | 12.2 | 12.1 | 12.1 | 12.0 | 12.0 | 11.9 | 11.9 | 11.9 | 11.8 | 11.8 | 11.7 | 11.7 | 11.6 |
| Sunrise (AM) | 5:31 | 5:32 | 5:33 | 5:34 | 5:35 | 5:36 | 5:37 | 5:38 | 5:39 | 5:40 | 5:41 | 5:42 | 5:42 | 5:43 | 5:44 | 5:45 | 5:46 | 5:47 | 5:48 | 5:49 | 5:50 | 5:51 | 5:52 | 5:53 | 5:54 | 5:55 | 5:56 | 5:57 | 5:58 | 6:00 |
| Sunset (PM) | 6:27 | 6:25 | 6:23 | 6:22 | 6:20 | 6:18 | 6:17 | 6:15 | 6:13 | 6:11 | 6:10 | 6:08 | 6:06 | 6:05 | 6:03 | 6:01 | 5:59 | 5:58 | 5:56 | 5:54 | 5:52 | 5:51 | 5:49 | 5:47 | 5:46 | 5:44 | 5:42 | 5:40 | 5:39 | 5:37 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 12.9 | 5:31 | 6:27 |
| 2 | 12.9 | 5:32 | 6:25 |
| 3 | 12.8 | 5:33 | 6:23 |
| 4 | 12.8 | 5:34 | 6:22 |
| 5 | 12.8 | 5:35 | 6:20 |
| 6 | 12.7 | 5:36 | 6:18 |
| 7 | 12.7 | 5:37 | 6:17 |
| 8 | 12.6 | 5:38 | 6:15 |
| 9 | 12.6 | 5:39 | 6:13 |
| 10 | 12.5 | 5:40 | 6:11 |
| 11 | 12.5 | 5:41 | 6:10 |
| 12 | 12.4 | 5:42 | 6:08 |
| 13 | 12.4 | 5:42 | 6:06 |
| 14 | 12.4 | 5:43 | 6:05 |
| 15 | 12.3 | 5:44 | 6:03 |
| 16 | 12.3 | 5:45 | 6:01 |
| 17 | 12.2 | 5:46 | 5:59 |
| 18 | 12.2 | 5:47 | 5:58 |
| 19 | 12.1 | 5:48 | 5:56 |
| 20 | 12.1 | 5:49 | 5:54 |
| 21 | 12.0 | 5:50 | 5:52 |
| 22 | 12.0 | 5:51 | 5:51 |
| 23 | 11.9 | 5:52 | 5:49 |
| 24 | 11.9 | 5:53 | 5:47 |
| 25 | 11.9 | 5:54 | 5:46 |
| 26 | 11.8 | 5:55 | 5:44 |
| 27 | 11.8 | 5:56 | 5:42 |
| 28 | 11.7 | 5:57 | 5:40 |
| 29 | 11.7 | 5:58 | 5:39 |
| 30 | 11.6 | 6:00 | 5:37 |
Solar energy in September
Average shortwave solar energy reaching the ground each day in September, about 4.21 kWh/m².
For context, solar energy here swings from a low near 1.8 kWh/m² to a high of 6.01 kWh/m² in June across the year — September's 4.21 kWh/m² falls in the middle.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 4.8 | 4.7 | 4.7 | 4.7 | 4.6 | 4.6 | 4.6 | 4.5 | 4.5 | 4.4 | 4.4 | 4.4 | 4.3 | 4.3 | 4.3 | 4.2 | 4.2 | 4.1 | 4.1 | 4.1 | 4.0 | 4.0 | 3.9 | 3.9 | 3.9 | 3.8 | 3.8 | 3.7 | 3.7 | 3.7 |
| Level | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 4.8 | Bright |
| 2 | 4.7 | Bright |
| 3 | 4.7 | Bright |
| 4 | 4.7 | Bright |
| 5 | 4.6 | Bright |
| 6 | 4.6 | Bright |
| 7 | 4.6 | Bright |
| 8 | 4.5 | Bright |
| 9 | 4.5 | Bright |
| 10 | 4.4 | Bright |
| 11 | 4.4 | Bright |
| 12 | 4.4 | Bright |
| 13 | 4.3 | Bright |
| 14 | 4.3 | Bright |
| 15 | 4.3 | Bright |
| 16 | 4.2 | Bright |
| 17 | 4.2 | Bright |
| 18 | 4.1 | Bright |
| 19 | 4.1 | Bright |
| 20 | 4.1 | Bright |
| 21 | 4.0 | Bright |
| 22 | 4.0 | Moderate |
| 23 | 3.9 | Moderate |
| 24 | 3.9 | Moderate |
| 25 | 3.9 | Moderate |
| 26 | 3.8 | Moderate |
| 27 | 3.8 | Moderate |
| 28 | 3.7 | Moderate |
| 29 | 3.7 | Moderate |
| 30 | 3.7 | Moderate |
Hazard calendar for Trenton
In September, Trenton sits inside its atlantic hurricane season. The full year is below, with each hazard's peak months called out.
Trenton sits in the Atlantic hurricane belt; the season peaks August–October.
Is September a good time to visit Trenton?
Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
September is a reasonable time to visit Trenton for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Trenton in September
From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In September, Trenton sees daytime highs around 77°F and nights near 60°F. Worth packing: light clothes and rain gear. About 9 days see rain.
UV index in Trenton in September
Clear-sky midday UV in September peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Trenton peaks around July 11 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 1 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 3 | 5 | 6 | 8 | 8 | 8 | 6 | 6 | 3 | 2 | 1 |
| Level | Low | Moderate | Moderate | High | Very high | Very high | Very high | High | High | Moderate | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Low |
| Feb | 3 | Moderate |
| Mar | 5 | Moderate |
| Apr | 6 | High |
| May | 8 | Very high |
| Jun | 8 | Very high |
| Jul | 8 | Very high |
| Aug | 6 | High |
| Sep | 6 | High |
| Oct | 3 | Moderate |
| Nov | 2 | Moderate |
| Dec | 1 | Low |
Air quality in Trenton in September
Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.
Air quality in Trenton is worst in July — around 18 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (November, 9 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 11 | 13 | 14 | 14 | 16 | 17 | 18 | 15 | 13 | 10 | 9 | 10 |
| Level | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 11 | Good |
| Feb | 13 | Moderate |
| Mar | 14 | Moderate |
| Apr | 14 | Moderate |
| May | 16 | Moderate |
| Jun | 17 | Moderate |
| Jul | 18 | Moderate |
| Aug | 15 | Moderate |
| Sep | 13 | Moderate |
| Oct | 10 | Good |
| Nov | 9 | Good |
| Dec | 10 | Good |
Where is Trenton?
Trenton sits at 40.2°N, 74.7°W, 56 ft above sea level, in United States. The nearest listed city is Mercerville-Hamilton Square, 3.7 mi away.
Topography around Trenton
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Trenton.
Within 2 miles, the terrain around Trenton has only modest variations in elevation — a maximum elevation change of 135 ft around an average of 59 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 515 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,535 ft.
The land around Trenton is covered by artificial surfaces (53%) and trees (32%) within 2 miles, trees (56%) within 10 miles, and trees (62%) within 50 miles.
United States travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 100% of US
- price level, 2025
- GDP per capita
- $90,027
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 5.8
- per 100k, 2023
- Road deaths
- 12.7
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Trenton (40.2171°, -74.7429°, elevation 56 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).