Casper, United States — Weather in August 2026

Climate Overview

Casper, United States in August has hot conditions, with highs reaching 30.7°C (87°F) and afternoons the warmest part of the day. Temperatures drop noticeably between day and night.

This month falls at the end of Summer. Temperatures are at their seasonal peak.

Daily highs in August gradually drop from around 32°C (89°F) at the start to 30°C (85°F) by month's end.

August sees fairly even rainfall, totalling about 21 mm across the month.

Expect around 12.9h of sunshine at the start of August, decreasing to 11.9h by the end.

The warmest days tend to fall around the 2th, averaging 31.8°C (89°F).

Compared to July, this month is about 2°C cooler with 1 more rainy days. Temperatures begin dropping heading into September.

Monthly August Averages

Temperature

31°C / 15°C

Feels Like

28°C / 14°C

Rain

5 days · 21 mm

Sunshine

12.3h / day

Humidity

39% — Comfortable

Wind

20 km/h

Wind Direction

SW (226°)

Gusts

43 km/h

Daylight

13.9 h

Cloud Cover

32%

Clear Sky Days

12.4

UV Index

7.4 — Very High

Dew Point

8°C — Dry

Moon Phase

Waxing Crescent · 3%

Climate Charts

Daily averages based on historical data (2016–2025)

Daily Temperature

HighLow

Daily Precipitation

Rainfall

Daily Sunshine

Sunshine

Daily Wind Speed

Wind Speed

Sun Position

Sunrise 06:13

Daylight 13.9h

Sunset 20:10

Compare Months

Month	Temp	Feels Like	Rain	Sun	Humidity	UV	Status	Details
January	-2°C / -12°C	-7°C / -18°C	7days (27 mm) Good	7.3h Good	73% Muggy	3.1 Moderate	Poor	View Details
February	0°C / -11°C	-5°C / -17°C	6days (24 mm) Good	8.5h Good	70% Muggy	3.9 Moderate	Poor	View Details
March	7°C / -5°C	2°C / -10°C	8days (46 mm) Wet	9.8h Good	68% Muggy	5.3 High	Poor	View Details
April	12°C / -2°C	8°C / -6°C	10days (59 mm) Wet	10.7h Excellent	64% Muggy	6.6 High	Poor	View Details
May	19°C / 5°C	16°C / 2°C	10days (63 mm) Wet	11.8h Excellent	61% Muggy	7.4 Very High	Fair	View Details
June best	28°C / 12°C	25°C / 10°C	7days (31 mm) Good	13.4h Excellent	44% Moderate	8.2 Very High	Excellent	View Details
July best	32°C / 17°C	30°C / 15°C	4days (12 mm) Good	13.4h Excellent	37% Comfortable	8.2 Very High	Excellent	View Details
August best	31°C / 15°C	28°C / 14°C	5days (21 mm) Good	12.3h Excellent	39% Comfortable	7.4 Very High	Excellent	View Details
September best	26°C / 10°C	22°C / 8°C	5days (25 mm) Good	10.9h Excellent	44% Moderate	6.2 High	Excellent	View Details
October	16°C / 2°C	11°C / -2°C	6days (39 mm) Good	9h Good	57% Moderate	4.6 Moderate	Fair	View Details
November	8°C / -3°C	3°C / -7°C	5days (22 mm) Good	7.8h Good	59% Moderate	3.1 Moderate	Poor	View Details
December	1°C / -8°C	-4°C / -14°C	5days (22 mm) Good	7.1h Good	65% Muggy	2.5 Moderate	Poor	View Details

What to Wear

Light, breathable fabrics like cotton and linen are essential. Opt for loose-fitting clothing in light colors to stay cool.

Temperatures drop significantly at night, so pack layers you can add or remove throughout the day.

Packing List

Breathable clothingSunscreen (SPF 30+)Sun hatSunglassesComfortable walking shoes

Frequently Asked Questions

Expand all

Is August a good time to visit Casper?

August is typically excellent for visiting Casper, with average highs of 31°C (87°F) and around 5 rainy days. Casper, United States in August has hot conditions, with highs reaching 30.7°C (87°F) and afternoons the warmest part of

Does it rain a lot in Casper in August?

Casper typically sees around 5 rainy days in August with 21 mm (0.8 in) of total rainfall. An umbrella should suffice.

Does it get cold at night in Casper in August?

Evenings in Casper during August are mild at 15°C (59°F). A light cardigan is usually enough.

What should I pack for Casper in August?

With highs of 31°C (87°F) and lows of 15°C (59°F) in August, we recommend: Breathable clothing, Sunscreen (SPF 30+), Sun hat, Sunglasses, Comfortable walking shoes. Comfortable walking shoes are essential.

Is August among the best months weather-wise in Casper?

Yes, August offers some of the best weather conditions in Casper with comfortable temperatures and lower chances of rain.

What is the UV index in Casper in August?

The average UV index in Casper during August is 7 (high). Wear sunscreen SPF 30+, a hat, and sunglasses. Limit direct sun exposure between 10 AM and 4 PM.

How many hours of daylight are there in Casper in August?

Casper gets approximately 14 hours of daylight per day in August, with around 12 hours of sunshine.

Does it snow in Casper in August?

Snow is uncommon in Casper during August based on 10-year climate averages.

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