Arnold Weather in September

Arnold in September averages 27°C (81°F) during the day and 15°C (59°F) at night. Keep in mind that quite a bit of rainfall is expected this month.

Rainfall in Arnold in September

Rain is expected on roughly 10 days, totalling around 117 mm (4.6 in) for the month. When showers do arrive, they tend to be on the heavier side. Worth being prepared even if rain days are not that numerous.

Temperature in Arnold in September

Expect highs of 27°C (81°F) in Arnold in September, with nights dropping to around 15°C (59°F). This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. With overnight lows of 15°C (59°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.

Sunshine in Arnold in September

The days are predominantly sunny, with an estimated total of around 235 hours of sunshine. These sun-filled days are perfect for playing sports, visiting parks, or going for a bike ride.

If your ideal day consists of dry skies and pleasant temperatures, October typically offers the best circumstances for Arnold.

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For a detailed overview over the year and the best time to visit the United States of America, check out our Arnold's climate page.

Arnold Temperature in September

Min Temperature 15°C (59°F)  

Max Temperature 27°C (81°F)  

Chance of Rain 33%  

Precipitation 117 mm (4.6 in)  

Rainy days 10 days  

Humidity 71% *  

Sunshine 235 hours *  

Percentage Sunshine 63% *  

* Data from: St. Louis, the United States of America (26 KM, 16 Miles).

What to Wear in Arnold in September

Warm temperatures in September make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Prepare for significant rainfall with proper waterproof clothing and shoes. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.

What To Do in Arnold in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

9/10

Cycling

7/10

Walking

7/10

Camping

6/10

Outdoor sports

7/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Arnold's climate page.

More climate data for Arnold

Temperature Rainfall Sunshine Humidity

See the full Arnold climate overview or explore weather in the United States of America.