Chatham in Fall
In fall (September, October and November), Chatham sees average daytime highs around 59°F and overnight lows near 51°F, with 11.2 in of precipitation over about 30 wet days across the season. It is the 2nd-warmest season and the 2nd-wettest season.
Over the season highs ease from about 76°F in early September to 42°F by late November. The sky is clear or mostly clear about 35% of the time across fall, and the air most often feels dry.
Fall is Chatham's 2nd-best season to visit on our travel score. For the whole year in context, see Chatham's year-round climate.
- Avg daytime high
- 59°F
- 2nd-warmest season
- Avg overnight low
- 51°F
- Precipitation
- 11.2 in
- 30 wet days
- Avg wind
- 13 mph
- Travel score
- 4.3
- 2nd-best season
- Months
- Sep · Oct · Nov
Temperature in Chatham in Fall
Over the season highs ease from about 76°F in early September to 42°F by late November.
A typical fall day in Chatham reaches about 59°F and drops to 51°F overnight. The warmest of the three months is September, the coolest November.
How fall really feels in Chatham
Once humidity and wind are folded in, fall brings about 0 days that feel above 90°F and 19 that feel at or below 32°F.
The story in fall is cold — wind chill drags the overnight "feels like" below the raw low.
Chatham 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 | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 31° / 21° | 3.3 | 10 | 6.4 | 9.3 | 0.0 |
| Feb | 32° / 22° | 2.6 | 8.2 | 5 | 10.3 | 0.0 |
| Mar | 39° / 30° | 3.2 | 10 | 3.2 | 11.7 | 0.1 |
| Apr | 50° / 42° | 4.9 | 12.4 | 1.1 | 13.1 | 2.2 |
| May | 63° / 54° | 4.6 | 12.1 | 0 | 14.3 | 5.2 |
| Jun | 74° / 65° | 3.9 | 11.6 | 0 | 15 | 6.5 |
| Jul | 79° / 71° | 3.4 | 11.4 | 0 | 14.7 | 6.5 |
| Aug | 78° / 70° | 3.8 | 10.8 | 0 | 13.7 | 6.8 |
| Sep | 71° / 63° | 3.3 | 9.1 | 0 | 12.3 | 6.9 |
| Oct | 59° / 51° | 4.1 | 10.7 | 0.1 | 10.9 | 4.6 |
| Nov | 46° / 39° | 3.8 | 10.3 | 1.2 | 9.6 | 1.3 |
| Dec | 36° / 28° | 3.2 | 10.2 | 4.6 | 9 | 0.0 |
Cloud cover in Fall
The sky is clear or mostly clear about 35% of the time across fall.
Chance of precipitation in Fall
Chatham gets around 11.2 in of rain and snow over 30 wet days across fall. The line is the day-by-day chance of measurable precipitation.
Humidity in Fall
Most of fall feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Fall
Winds average 13 mph across fall.
Sunrise & sunset in Fall
Daylight runs from about 13 hours in early September to 9 h 12 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 3.2 kWh/m².
Is fall a good time to visit Chatham?
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 Chatham for sightseeing.
What to pack for Chatham in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Chatham sees daytime highs around 59°F and nights near 51°F. Pack a warm layer. Worth having: a heavy coat, rain gear, sun protection and a windbreaker. About 30 days see rain.
Sea temperature near Chatham in Fall
The nearest coast averages about 58°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 9 mi away) is warmest in August at about 73°F and coldest in February near 36°F.
It's comfortable for a long swim from Jul 13 to Sep 15 — about 2.1 months when the water holds above 68°F.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°F) | 38 | 36 | 36 | 39 | 45 | 57 | 70 | 73 | 68 | 58 | 49 | 42 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Refreshing | Refreshing | Refreshing | Bracing | Bracing | Bracing |
| Sea temperature (°F) | Comfort | |
|---|---|---|
| Jan | 38 | Bracing |
| Feb | 36 | Bracing |
| Mar | 36 | Bracing |
| Apr | 39 | Bracing |
| May | 45 | Bracing |
| Jun | 57 | Bracing |
| Jul | 70 | Refreshing |
| Aug | 73 | Refreshing |
| Sep | 68 | Refreshing |
| Oct | 58 | Bracing |
| Nov | 49 | Bracing |
| Dec | 42 | Bracing |
UV index in Chatham in Fall
Clear-sky midday UV across fall averages around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Chatham peaks around June 23 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 at about 2 (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 | 7 | 9 | 9 | 8 | 6 | 3 | 2 | 2 |
| Level | Low | Moderate | Moderate | High | Very high | Very high | Very high | Very high | High | Moderate | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Low |
| Feb | 3 | Moderate |
| Mar | 5 | Moderate |
| Apr | 6 | High |
| May | 7 | Very high |
| Jun | 9 | Very high |
| Jul | 9 | Very high |
| Aug | 8 | Very high |
| Sep | 6 | High |
| Oct | 3 | Moderate |
| Nov | 2 | Moderate |
| Dec | 2 | Low |
Air quality in Chatham 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 Chatham is worst in July — around 21 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (October, 10 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) | 12 | 15 | 18 | 19 | 20 | 21 | 21 | 18 | 15 | 10 | 10 | 11 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 12 | Moderate |
| Feb | 15 | Moderate |
| Mar | 18 | Moderate |
| Apr | 19 | Moderate |
| May | 20 | Moderate |
| Jun | 21 | Moderate |
| Jul | 21 | Moderate |
| Aug | 18 | Moderate |
| Sep | 15 | Moderate |
| Oct | 10 | Good |
| Nov | 10 | Good |
| Dec | 11 | Good |
Where is Chatham?
Chatham sits at 41.7°N, 87.6°W, 591 ft above sea level, in United States. The nearest listed city is Greater Grand Crossing, 1.2 mi away.
Topography around Chatham
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Chatham.
Within 2 miles, the terrain around Chatham has only modest variations in elevation — a maximum elevation change of 75 ft around an average of 597 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 515 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 741 ft.
The land around Chatham is covered by artificial surfaces (81%) within 2 miles, artificial surfaces (52%) and water (29%) within 10 miles, and water (31%), cropland (26%) and trees (20%) 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 Chatham (41.7411°, -87.6125°, elevation 591 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.