Ballwin, United States — Weather in August 2026

Climate Overview

Ballwin, United States in August has hot conditions, with highs reaching 29.5°C (85°F) and afternoons the warmest part of the day. Rain falls on about 11 days this month.

This month falls at the end of Summer.

Temperatures remain fairly steady throughout August, with daily highs around 29°C (84°F).

August sees fairly even rainfall, totalling about 117 mm across the month.

Expect around 11.6h of sunshine at the start of August, decreasing to 10.5h by the end.

The warmest days tend to fall around the 10th, averaging 30.3°C (87°F).

Compared to July, this month is about 2°C cooler with 2 fewer rainy days.

Monthly August Averages

Temperature

30°C / 21°C

Feels Like

33°C / 23°C

Rain

11 days · 117 mm

Sunshine

11h / day

Humidity

72% — Muggy

Wind

12 km/h

Wind Direction

S (176°)

Gusts

29 km/h

Daylight

13.6 h

Cloud Cover

53%

Clear Sky Days

3.9

UV Index

6.8 — High

Dew Point

20°C — Humid

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 06:18

Daylight 13.7h

Sunset 19:59

What to Expect

Daytime temperatures around 30°C (85°F) are ideal for full-day outdoor exploration.

Rain usually comes in shorter passing showers rather than all-day rain.

1 of the last 5 yearly records were warmer than this month's long-run average.

Compare Months

Month	Temp	Feels Like	Rain	Sun	Humidity	UV	Status	Details
January	5°C / -3°C	1°C / -8°C	8days (75 mm) Wet	5.7h Fair	69% Muggy	2.6 Moderate	Poor	View Details
February	9°C / -1°C	5°C / -6°C	8days (69 mm) Wet	7h Good	67% Muggy	3.7 Moderate	Poor	View Details
March	15°C / 4°C	12°C / 1°C	12days (118 mm) Wet	7.6h Good	66% Muggy	5.2 High	Fair	View Details
April	19°C / 9°C	18°C / 6°C	12days (129 mm) Wet	9h Good	65% Muggy	5.8 High	Good	View Details
May best	24°C / 15°C	25°C / 14°C	14days (129 mm) Wet	10h Excellent	72% Muggy	6.9 High	Excellent	View Details
June best	30°C / 20°C	33°C / 21°C	10days (89 mm) Wet	12.1h Excellent	67% Muggy	7.4 Very High	Excellent	View Details
July	31°C / 22°C	35°C / 25°C	13days (107 mm) Wet	12h Excellent	72% Muggy	7.4 Very High	Fair	View Details
August best	30°C / 21°C	33°C / 23°C	11days (117 mm) Wet	11h Excellent	72% Muggy	6.8 High	Good	View Details
September best	28°C / 18°C	29°C / 19°C	7days (74 mm) Good	10.3h Excellent	68% Muggy	5.8 High	Excellent	View Details
October best	21°C / 12°C	20°C / 10°C	9days (83 mm) Wet	7.9h Good	67% Muggy	4.4 Moderate	Good	View Details
November	13°C / 5°C	10°C / 1°C	8days (70 mm) Wet	6.9h Fair	68% Muggy	3 Moderate	Fair	View Details
December	8°C / 0°C	5°C / -4°C	8days (59 mm) Wet	5.8h Fair	70% Muggy	2.3 Moderate	Poor	View Details

What to Wear

Summer clothing like shorts, t-shirts, and sundresses will be comfortable. Bring a light cardigan for air-conditioned spaces.

A waterproof jacket or compact umbrella is recommended for occasional showers.

Packing List

UmbrellaWaterproof jacketBreathable clothingSunscreen (SPF 30+)Sun hatSunglassesComfortable walking shoes

Frequently Asked Questions

Expand all

Is August a good time to visit Ballwin?

August is typically good for visiting Ballwin, with average highs of 30°C (85°F) and around 11 rainy days. Ballwin, United States in August has hot conditions, with highs reaching 29.5°C (85°F) and afternoons the warmest part o

Does it rain a lot in Ballwin in August?

Ballwin typically sees around 11 rainy days in August with 117 mm (4.6 in) of total rainfall. Pack a waterproof jacket.

Does it get cold at night in Ballwin in August?

Nights stay pleasantly warm in Ballwin during August, around 21°C (70°F). Light evening wear is sufficient.

What should I pack for Ballwin in August?

With highs of 30°C (85°F) and lows of 21°C (70°F) in August, we recommend: Umbrella, Waterproof jacket, Breathable clothing, Sunscreen (SPF 30+), Sun hat. Comfortable walking shoes are essential.

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

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

What is the UV index in Ballwin in August?

The average UV index in Ballwin 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 Ballwin in August?

Ballwin gets approximately 14 hours of daylight per day in August, with around 11 hours of sunshine.

Does it snow in Ballwin in August?

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

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