Casper in Fall
In fall (September, October and November), Casper sees average daytime highs around 56°F and overnight lows near 34°F, with 4.0 in of precipitation over about 18 wet days across the season. It is the 2nd-warmest season and the 2nd-wettest season.
Over the season highs ease from about 78°F in early September to 35°F by late November. The sky is clear or mostly clear about 50% of the time across fall, and the air most often feels dry.
Fall is Casper's 2nd-best season to visit on our travel score. For the whole year in context, see Casper's year-round climate.
- Avg daytime high
- 56°F
- 2nd-warmest season
- Avg overnight low
- 34°F
- Precipitation
- 4.0 in
- 18 wet days
- Avg wind
- 8 mph
- Travel score
- 4.0
- 2nd-best season
- Months
- Sep · Oct · Nov
Temperature in Casper in Fall
Over the season highs ease from about 78°F in early September to 35°F by late November.
A typical fall day in Casper reaches about 56°F and drops to 34°F overnight. The warmest of the three months is September, the coolest November.
How fall really feels in Casper
Once humidity and wind are folded in, fall brings about 0 days that feel above 90°F and 57 that feel at or below 32°F.
The story in fall is cold — wind chill drags the overnight "feels like" below the raw low.
Casper 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 | 29° / 12° | 0.8 | 5.6 | 5.7 | 9.2 | 0.0 |
| Feb | 32° / 13° | 1.0 | 5.9 | 5.8 | 10.2 | 0.0 |
| Mar | 42° / 22° | 1.5 | 7.1 | 6 | 11.6 | 0.5 |
| Apr | 50° / 29° | 2.3 | 10.8 | 7 | 13.1 | 2.3 |
| May | 62° / 39° | 2.7 | 11.1 | 2.3 | 14.4 | 5.0 |
| Jun | 75° / 49° | 1.4 | 6.3 | 0.1 | 15.1 | 7.5 |
| Jul | 84° / 56° | 0.7 | 4.5 | 0 | 14.8 | 6.5 |
| Aug | 82° / 55° | 0.6 | 4.1 | 0 | 13.8 | 7.3 |
| Sep | 71° / 46° | 1.1 | 5.6 | 0.7 | 12.3 | 7.5 |
| Oct | 55° / 33° | 1.8 | 7 | 4.1 | 10.8 | 4.0 |
| Nov | 41° / 22° | 1.1 | 5.7 | 5.5 | 9.5 | 0.4 |
| Dec | 30° / 13° | 0.9 | 5.6 | 6.1 | 8.9 | 0.0 |
Cloud cover in Fall
The sky is clear or mostly clear about 50% of the time across fall.
Chance of precipitation in Fall
Casper gets around 4.0 in of rain and snow over 18 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 8 mph across fall.
Sunrise & sunset in Fall
Daylight runs from about 13 hours in early September to 9 h 06 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 4.0 kWh/m².
Is fall a good time to visit Casper?
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 weaker month for outdoor sightseeing in Casper.
What to pack for Casper in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Casper sees daytime highs around 56°F and nights near 34°F. Pack a warm layer and a heavy coat. Worth having: sun protection. About 18 days see rain.
UV index in Casper in Fall
Clear-sky midday UV across fall averages around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Casper peaks around July 11 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 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 | 8 | 10 | 10 | 8 | 7 | 4 | 3 | 2 |
| Level | Low | Moderate | High | 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 | High |
| Apr | 6 | High |
| May | 8 | Very high |
| Jun | 10 | Very high |
| Jul | 10 | Very high |
| Aug | 8 | Very high |
| Sep | 7 | High |
| Oct | 4 | Moderate |
| Nov | 3 | Moderate |
| Dec | 2 | Low |
Where is Casper?
Casper sits at 42.9°N, 106.3°W, 5,118 ft above sea level, in United States. The nearest listed city is Gillette, 106 mi away.
Topography around Casper
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Casper.
Within 2 miles, the terrain around Casper has only modest variations in elevation — a maximum elevation change of 282 ft around an average of 5,180 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 3,173 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 4,770 ft.
The land around Casper is covered by grassland (49%) and artificial surfaces (32%) within 2 miles, grassland (81%) within 10 miles, and grassland (91%) 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 Casper (42.8666°, -106.3131°, elevation 5,118 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.