New Brunswick weather in September: New Brunswick, New Jersey: normal highs, lows, rain and records for September
New Brunswick in September has a normal high of 78°F and a normal low of 57°F, a daily mean of 67°F, falling from 83°F on the 1st to 73°F by the 30th. Measurable precipitation falls on 9 days in a normal September, 4.18 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 26°C and low of 14°C, 106 mm of precipitation in September.
- NOAA stationNew Brunswick (3 mi SE)
- Station IDUSC00286055
- Location40.47°N 74.42°W
- Elevation111 ft (34 m)
- From the center1 miles
- Population57,487
- Jan 40° 23°
- Feb 43° 24°
- Mar 51° 31°
- Apr 63° 41°
- May 72° 51°
- Jun 81° 60°
- Jul 87° 66°
- Aug 85° 64°
- Sep 78° 57°
- Oct 67° 44°
- Nov 56° 35°
- Dec 45° 28°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is New Brunswick in September?
The normal high is 78°F and the normal low 57°F, for a daily mean of 67.4°F. September is 6.9°F cooler than August and 12.0°F warmer than October. September is the 4th warmest month of the year in New Brunswick and the 6th wettest. Across the month the normal high falls 10°F, from 83°F on September 1 to 73°F on September 30. From one year to the next September's mean temperature typically moves about 2.1°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 65°F and 70°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 31%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 83°F | 61°F | 29% | 19% |
| September 8 | 81°F | 59°F | 28% | 19% |
| September 15 | 79°F | 57°F | 28% | 19% |
| September 22 | 76°F | 54°F | 30% | 19% |
| September 30 | 73°F | 51°F | 31% | 20% |
Every day of September: normal high, low and chance of precipitation (warmest afternoon September 1, coldest night September 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| September 1 | 83°F | 61°F | 29% | 19% | 13 h 10 min |
| September 2 | 83°F | 61°F | 29% | 19% | 13 h 10 min |
| September 3 | 82°F | 61°F | 29% | 19% | 13 h |
| September 4 | 82°F | 61°F | 29% | 19% | 13 h |
| September 5 | 82°F | 60°F | 29% | 19% | 13 h |
| September 6 | 82°F | 60°F | 28% | 19% | 13 h |
| September 7 | 81°F | 60°F | 28% | 19% | 12 h 50 min |
| September 8 | 81°F | 59°F | 28% | 19% | 12 h 50 min |
| September 9 | 81°F | 59°F | 28% | 19% | 12 h 50 min |
| September 10 | 81°F | 59°F | 28% | 19% | 12 h 40 min |
| September 11 | 80°F | 58°F | 28% | 19% | 12 h 40 min |
| September 12 | 80°F | 58°F | 28% | 19% | 12 h 40 min |
| September 13 | 80°F | 58°F | 28% | 19% | 12 h 40 min |
| September 14 | 79°F | 57°F | 28% | 19% | 12 h 30 min |
| September 15 | 79°F | 57°F | 28% | 19% | 12 h 30 min |
| September 16 | 79°F | 57°F | 29% | 19% | 12 h 30 min |
| September 17 | 78°F | 56°F | 29% | 19% | 12 h 30 min |
| September 18 | 78°F | 56°F | 29% | 19% | 12 h 20 min |
| September 19 | 77°F | 55°F | 29% | 19% | 12 h 20 min |
| September 20 | 77°F | 55°F | 29% | 19% | 12 h 20 min |
| September 21 | 77°F | 55°F | 29% | 19% | 12 h 20 min |
| September 22 | 76°F | 54°F | 30% | 19% | 12 h 10 min |
| September 23 | 76°F | 54°F | 30% | 20% | 12 h 10 min |
| September 24 | 75°F | 53°F | 30% | 20% | 12 h 10 min |
| September 25 | 75°F | 53°F | 30% | 20% | 12 h 10 min |
| September 26 | 75°F | 52°F | 30% | 20% | 12 h |
| September 27 | 74°F | 52°F | 31% | 20% | 12 h |
| September 28 | 74°F | 52°F | 31% | 20% | 12 h |
| September 29 | 73°F | 51°F | 31% | 20% | 11 h 50 min |
| September 30 | 73°F | 51°F | 31% | 20% | 11 h 50 min |
- Normal high
- 78°FSeptember average
- Normal low
- 57°FSeptember average
- Precipitation
- 4.18 inmonth total
- Days with precipitation
- 90.01 inch or more
- Days at 90°F or more
- 2
- Daylight
- 13 h 10 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 27
- Days at 80°F or more
- 14
- Sunshine
- 76%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00286055; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in New Brunswick in September?
On a given September day the chance of 0.01 inch or more is 29% on average, highest around September 30 (31%). In all, 4.18 in falls on 9 days of a normal September, 1 of them with an inch or more.
In a normal September in New Brunswick, 2 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00286055.
What are the records for September in New Brunswick?
The warmest September temperature on New Brunswick's official record (since 1893) is 103°F, on September 23, 1895; the coldest is 33°F, on September 30, 1942. The wettest September brought 12.68 in (1989).
The September mean against the 1991-2020 normal of 67.4°F: 2021 69.5°F (+2.1), 2022 68.0°F (+0.6), 2023 68.6°F (+1.2), 2024 67.5°F (+0.1), 2025 69.0°F (+1.6), 2026 69.2°F (+1.8). 6 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 69.5°F | +2.1°F | 10.01 in |
| 2022 | 68.0°F | +0.6°F | 2.69 in |
| 2023 | 68.6°F | +1.2°F | 10.93 in |
| 2024 | 67.5°F | +0.1°F | 1.06 in |
| 2025 | 69.0°F | +1.6°F | 2.44 in |
| 2026 | 69.2°F | +1.8°F | 6.70 in |
Source: records: ACIS, NWS threaded record NBRN4thr; recent months: ACIS, station USC00286055. Records and recent months use complete months only.
How does September in New Brunswick compare across New Jersey?
Across the 33 places PlainClimate covers in New Jersey, September normal highs run from 74°F in Andover to 80°F in Belleplain; New Brunswick's is 78°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- New Brunswick in August85°F by day, 64°F at night
- New Brunswick in October67°F by day, 44°F at night
- New Brunswick through the yearEvery month, frost dates, records and recent years
- New Jersey in SeptemberThe statewide normal and the warmest and coolest places
- Belleplain: New Jersey's warmest Septembernormal high 80°F