Princeton in Fall
In fall (September, October and November), Princeton sees average daytime highs around 84°F and overnight lows near 73°F, with 12.2 in of rain over about 45 wet days across the season. It is the 2nd-warmest season and the 2nd-wettest season.
Over the season highs ease from about 88°F in early September to 79°F by late November. The sky is clear or mostly clear about 32% of the time across fall, and the air most often feels oppressive.
Fall is Princeton's 3rd-best season to visit on our travel score. For the whole year in context, see Princeton's year-round climate.
- Avg daytime high
- 84°F
- 2nd-warmest season
- Avg overnight low
- 73°F
- Rainfall
- 12.2 in
- 45 wet days
- Avg wind
- 7 mph
- Travel score
- 5.1
- 3rd-best season
- Months
- Sep · Oct · Nov
Temperature in Princeton in Fall
Over the season highs ease from about 88°F in early September to 79°F by late November.
A typical fall day in Princeton reaches about 84°F and drops to 73°F overnight. The warmest of the three months is September, the coolest November.
How fall really feels in Princeton
Once humidity and wind are folded in, fall brings about 46 days that feel above 90°F and 0 that feel at or below 32°F.
The story in fall is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Princeton weather by month
How the three fall months (September, October and November) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 75° / 61° | 1.4 | 5.7 | 10.6 | 7.8 |
| Feb | 77° / 62° | 1.3 | 5.8 | 11.1 | 7.7 |
| Mar | 80° / 65° | 1.6 | 6.2 | 11.8 | 7.4 |
| Apr | 83° / 69° | 2.0 | 7.7 | 12.6 | 6.4 |
| May | 85° / 73° | 3.8 | 13.1 | 13.2 | 4.9 |
| Jun | 87° / 77° | 7.3 | 23.7 | 13.6 | 3.1 |
| Jul | 88° / 78° | 5.9 | 24.7 | 13.4 | 2.9 |
| Aug | 89° / 78° | 6.9 | 25.7 | 12.9 | 2.8 |
| Sep | 87° / 77° | 6.7 | 23.2 | 12.2 | 3.2 |
| Oct | 85° / 74° | 4.0 | 15 | 11.4 | 4.9 |
| Nov | 80° / 68° | 1.5 | 6.8 | 10.8 | 7.1 |
| Dec | 77° / 64° | 1.2 | 5.5 | 10.4 | 7.7 |
Cloud cover in Fall
The sky is clear or mostly clear about 32% of the time across fall.
Chance of precipitation in Fall
Princeton gets around 12.2 in of rain over 45 wet days across fall. The line is the day-by-day chance of measurable precipitation.
Humidity in Fall
Most of fall feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Fall
Winds average 7 mph across fall.
Sunrise & sunset in Fall
Daylight runs from about 12 h 30 min in early September to 10 h 30 min by late November. The lit band spans sunrise to sunset each day.
Solar energy in Fall
Average shortwave solar energy reaching the ground each day across fall, about 4.4 kWh/m².
Hazard calendar for Princeton
In fall, Princeton overlaps its atlantic hurricane and monsoon season. The full year is below, with each hazard's peak months called out.
Princeton sits in the Atlantic hurricane belt; the season peaks August–October.
Princeton's monsoon runs May–October, when most of the year's rain falls.
Is fall a good time to visit Princeton?
Our two travel scores rate fall for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
fall is a reasonable time to visit Princeton for sightseeing.
What to pack for Princeton in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Princeton sees daytime highs around 84°F and nights near 73°F. Pack light clothes and rain gear. Worth having: sun protection. About 45 days see rain.
Sea temperature near Princeton in Fall
The nearest coast averages about 83°F across fall — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 19 mi away) is warmest in August at about 85°F and coldest in February near 76°F.
The water stays above 68°F all year — warm enough for a swim any month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°F) | 76 | 76 | 77 | 78 | 81 | 83 | 85 | 85 | 85 | 83 | 80 | 78 |
| Comfort | Warm | Warm | Warm | Warm | Warm | Tropical | Tropical | Tropical | Tropical | Tropical | Warm | Warm |
| Sea temperature (°F) | Comfort | |
|---|---|---|
| Jan | 76 | Warm |
| Feb | 76 | Warm |
| Mar | 77 | Warm |
| Apr | 78 | Warm |
| May | 81 | Warm |
| Jun | 83 | Tropical |
| Jul | 85 | Tropical |
| Aug | 85 | Tropical |
| Sep | 85 | Tropical |
| Oct | 83 | Tropical |
| Nov | 80 | Warm |
| Dec | 78 | Warm |
UV index in Princeton in Fall
Clear-sky midday UV across fall averages around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Princeton peaks around July 15 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 18 at about 5 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 5 | 7 | 10 | 10 | 11 | 11 | 12 | 11 | 10 | 8 | 6 | 5 |
| Level | High | Very high | Very high | Very high | Extreme | Extreme | Extreme | Extreme | Very high | Very high | High | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 5 | High |
| Feb | 7 | Very high |
| Mar | 10 | Very high |
| Apr | 10 | Very high |
| May | 11 | Extreme |
| Jun | 11 | Extreme |
| Jul | 12 | Extreme |
| Aug | 11 | Extreme |
| Sep | 10 | Very high |
| Oct | 8 | Very high |
| Nov | 6 | High |
| Dec | 5 | Moderate |
Air quality in Princeton in Fall
Average fine-particle pollution (PM2.5) through the year — so you can see where fall falls, not just the annual average.
Air quality in Princeton is worst in July — around 23 µg/m³ PM2.5 (moderate), about 2.5× 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 | 11 | 14 | 14 | 14 | 19 | 23 | 19 | 15 | 11 | 9 | 10 |
| Level | Good | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 11 | Good |
| Feb | 11 | Good |
| Mar | 14 | Moderate |
| Apr | 14 | Moderate |
| May | 14 | Moderate |
| Jun | 19 | Moderate |
| Jul | 23 | Moderate |
| Aug | 19 | Moderate |
| Sep | 15 | Moderate |
| Oct | 11 | Good |
| Nov | 9 | Good |
| Dec | 10 | Good |
Where is Princeton?
Princeton sits at 25.5°N, 80.4°W, 10 ft above sea level, in United States. The nearest listed city is Leisure City, 3.1 mi away.
Topography around Princeton
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Princeton.
Within 2 miles, the terrain around Princeton has only modest variations in elevation — a maximum elevation change of 49 ft around an average of 13 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 148 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 171 ft.
The land around Princeton is covered by grassland (35%), artificial surfaces (32%) and trees (22%) within 2 miles, grassland (20%) within 10 miles, and water (43%) and wetland (36%) 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 Princeton (25.5384°, -80.4089°, elevation 10 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.