See exactly when rain will start and stop with a minute-by-minute precipitation nowcast for the next hour.
24°
Clear
Feels Like: 11°
Min: 14°
Max: 39°
The next few hours will be clear, with today reaching 38°C and dropping to 11°C. The coming days will be drizzle
Compare today's weather with yesterday's data and track temperature trends over time.
Hourly Forecast
Daylight Hours
06:48
Sunrise
19:03
Sunset
Moon
Waxing Crescent
11:33
Moonrise
20:43
Moonset
Daily Forecast
Today
Wednesday
Thursday
Friday
Saturday
Sunday
Monday
Tuesday
Wednesday
Thursday
Air Quality Data Available
Upgrade to access real-time air quality data for Arnold.
Resources
UV Index
Humidity
Weather in Arnold today, September 15, 2026
Conditions in Arnold on September 15, 2026 favour clear skies, so the day opens with a fine, sunny outlook. Any interruptions to the blue should be brief rather than lasting. Morning skies stay relatively clear, holding cloud close to 0% near 04:00. The early part of the day favours being outside.
The temperature range runs from about 14°C up to 39°C. The air stays humid, with relative humidity between 24% and 83% and the peak around 07:00. Winds stay light, near 5.6 km/h by 09:00, so the day feels still more than breezy.
Through the afternoon cloud remains the main feature, with cover near 78% around 23:00. Bright spells should stay limited even as the day wears on. Expect visibility around 16.1 km. Expect sunrise at 06:48, sunset at 19:03, and 12 hours 14 minutes of sunlight today overall.
The practical takeaway for Arnold is a bright September 15, 2026, ideal for outdoor errands before temperatures ease from about 39°C.
Frequently asked questions about weather in Arnold
How warm does it get in Arnold?
The warmest month in Arnold is July, with average high temperatures of 32°C. The average temperature during this period is around 26°C.
How cold does it get in Arnold?
The coldest month in Arnold is January, with average low temperatures of -3°C. The average temperature during this period is around 0°C.
What is the wettest time of year in Arnold?
The wettest month in Arnold is May, with an average of 131mm of precipitation.
What is the driest time of year in Arnold?
The driest month in Arnold is December, with an average of 59mm of precipitation.
Explore more weather forecasts
- Oakville, Missouri
- New York City, New York
- Mehlville, Missouri
- Los Angeles, California
- Concord, Missouri
- Brooklyn, New York
- Affton, Missouri
- Chicago, Illinois
- Crestwood, Missouri
- Houston, Texas
- Lemay, Missouri
- Queens, New York
- Kirkwood, Missouri
- Phoenix, Arizona
- Webster Groves, Missouri
- Philadelphia, Pennsylvania
