Suisun in Fall
In fall (September, October and November), Suisun sees average daytime highs around 75°F and overnight lows near 52°F, with 3.0 in of rain over about 9 wet days across the season. It is the 2nd-warmest season and the 3rd-wettest season.
Over the season highs ease from about 85°F in early September to 61°F by late November. The sky is clear or mostly clear about 67% of the time across fall, and the air most often feels dry.
Fall is Suisun's best season of the year to visit on our travel score. For the whole year in context, see Suisun's year-round climate.
- Avg daytime high
- 75°F
- 2nd-warmest season
- Avg overnight low
- 52°F
- Rainfall
- 3.0 in
- 9 wet days
- Avg wind
- 5 mph
- Travel score
- 7.6
- best season of the year
- Months
- Sep · Oct · Nov
Temperature in Suisun in Fall
Over the season highs ease from about 85°F in early September to 61°F by late November.
A typical fall day in Suisun reaches about 75°F and drops to 52°F overnight. The warmest of the three months is September, the coolest November.
Suisun 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 | 58° / 42° | 4.3 | 9.2 | 9.6 | 4.3 |
| Feb | 62° / 44° | 4.2 | 9 | 10.5 | 5.2 |
| Mar | 66° / 46° | 3.1 | 8.2 | 11.7 | 6.4 |
| Apr | 71° / 49° | 1.3 | 4.8 | 13 | 7.5 |
| May | 77° / 53° | 0.7 | 3.2 | 14 | 8.4 |
| Jun | 83° / 57° | 0.2 | 0.9 | 14.6 | 7.7 |
| Jul | 85° / 58° | 0.0 | 0.1 | 14.4 | 7.1 |
| Aug | 85° / 58° | 0.0 | 0.2 | 13.5 | 7.1 |
| Sep | 84° / 57° | 0.1 | 0.4 | 12.3 | 7.7 |
| Oct | 77° / 53° | 0.9 | 2.7 | 11 | 8.5 |
| Nov | 65° / 47° | 2.0 | 5.8 | 9.9 | 6.6 |
| Dec | 58° / 42° | 3.9 | 9 | 9.4 | 4.3 |
Cloud cover in Fall
The sky is clear or mostly clear about 67% of the time across fall.
Chance of precipitation in Fall
Suisun gets around 3.0 in of rain over 9 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 5 mph across fall.
Sunrise & sunset in Fall
Daylight runs from about 12 h 54 min in early September to 9 h 36 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 4.3 kWh/m².
Hazard calendar for Suisun
In fall, Suisun overlaps its rainy season season. The full year is below, with each hazard's peak months called out.
Suisun's rainy season runs November–March, when most of the year's rain falls.
Is fall a good time to visit Suisun?
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 one of the better times to visit Suisun for general sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Suisun in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Suisun sees daytime highs around 75°F and nights near 52°F. Pack light clothes. Worth having: sun protection. About 9 days see rain.
Sea temperature near Suisun in Fall
The nearest coast averages about 57°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 40 mi away) is warmest in September at about 58°F and coldest in April near 53°F.
The water stays below 68°F all year — cool enough that most swimmers want a wetsuit.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°F) | 53 | 53 | 54 | 53 | 53 | 54 | 56 | 58 | 58 | 57 | 55 | 54 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing |
| Sea temperature (°F) | Comfort | |
|---|---|---|
| Jan | 53 | Bracing |
| Feb | 53 | Bracing |
| Mar | 54 | Bracing |
| Apr | 53 | Bracing |
| May | 53 | Bracing |
| Jun | 54 | Bracing |
| Jul | 56 | Bracing |
| Aug | 58 | Bracing |
| Sep | 58 | Bracing |
| Oct | 57 | Bracing |
| Nov | 55 | Bracing |
| Dec | 54 | Bracing |
UV index in Suisun 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 Suisun peaks around June 23 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 13 at about 2 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 4 | 5 | 6 | 8 | 10 | 10 | 9 | 6 | 5 | 2 | 2 |
| Level | Moderate | Moderate | Moderate | High | Very high | Very high | Very high | Very high | High | Moderate | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Moderate |
| Feb | 4 | Moderate |
| Mar | 5 | Moderate |
| Apr | 6 | High |
| May | 8 | Very high |
| Jun | 10 | Very high |
| Jul | 10 | Very high |
| Aug | 9 | Very high |
| Sep | 6 | High |
| Oct | 5 | Moderate |
| Nov | 2 | Moderate |
| Dec | 2 | Low |
Air quality in Suisun 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 Suisun is worst in September — around 29 µg/m³ PM2.5 (moderate), about 4.2× the cleanest month (June, 7 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) | 13 | 13 | 13 | 10 | 8 | 7 | 10 | 25 | 29 | 27 | 16 | 12 |
| Level | Moderate | Moderate | Moderate | Good | Good | Good | Good | Moderate | Moderate | Moderate | Moderate | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 13 | Moderate |
| Feb | 13 | Moderate |
| Mar | 13 | Moderate |
| Apr | 10 | Good |
| May | 8 | Good |
| Jun | 7 | Good |
| Jul | 10 | Good |
| Aug | 25 | Moderate |
| Sep | 29 | Moderate |
| Oct | 27 | Moderate |
| Nov | 16 | Moderate |
| Dec | 12 | Good |
Where is Suisun?
Suisun sits at 38.2°N, 122.0°W, 7 ft above sea level, in United States. The nearest listed city is Fairfield, 0.6 mi away.
Topography around Suisun
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Suisun.
Within 2 miles, the terrain around Suisun has only modest variations in elevation — a maximum elevation change of 194 ft around an average of 16 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 2,382 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 4,459 ft.
The land around Suisun is covered by artificial surfaces (40%) and wetland (23%) within 2 miles, grassland (43%) within 10 miles, and grassland (32%) and trees (24%) 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 Suisun (38.2383°, -122.0402°, elevation 7 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.