Arnold (MO) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Arnold.
Climate overview of Arnold
Arnold, Missouri, United States of America, sees big temperature differences between seasons, with July peaking at 32°C (90°F) and January dropping to 5°C (41°F).
The city receives considerable rain/snowfall, with around 1196 mm (47 in) annually. April is the wettest month. It has very warm summers and cold winters. Sunshine peaks in July, when the city sees around 10.4 hours of sunshine per day.
Arnold Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Arnold - and find the best time to visit.
Monthly Temperature in Arnold
Visitors to Arnold can expect significant temperature changes throughout the year. Typically, average maximum daytime temperatures range from a very warm 32°C (90°F) in July to a chilly 5°C (41°F) in the coolest month, January.
Nights vary from 20°C (68°F) in July to around -5°C (23°F) during the colder months.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Arnold
Arnold is known for its substantial rain/snowfall, with annual precipitation reaching 1196 mm (47 in). The climate in Arnold shows significant variation throughout the year. Expect high rainfall in April, the wettest month, with an average of 142 mm (5.6 in) of precipitation over 12 rainy days.
In contrast, the driest month January offers drier and sunnier days, with around 54 mm (2.1 in) of snow/rainfall over 7 snowy/rainy days. For more details, please visit our Arnold Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Arnold
For those who appreciate different seasons, Arnold serves as an ideal destination. Expect longer, more sun-filled days in July with an average of 10.4 hours of sunshine daily, and embrace the darker days in December, offering only 4.3 hours of daily sunlight.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Humidity in Arnold by Month
The relative humidity is high throughout the year in Arnold.
The city experiences its highest humidity in December, reaching 74%. In April, the humidity drops to its lowest level at 63%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Arnold
Each month is rated for comfortable sightseeing weather — mild temperatures and low rainfall. Tap a month for its full averages; your ideal time may differ for a beach or winter trip (see below).
- Best overall: October
- Warmest weather: June, July and August
- Most sunshine: July
- Fewer rainy days: January, February, August, October and November
- Climate seasons: very warm summers and cold winters
- Best for winter weather: January, with freezing nights around -5°C (23°F).
Frequently asked questions about the climate in Arnold
What is the best time to visit Arnold?
October typically offers the most optimal weather in Arnold. In contrast, January, February and December tend to have less optimal conditions. Arnold has very warm summers and cold winters.
What temperatures can I expect in Arnold?
Daytime highs range from 5°C (41°F) in January to 32°C (90°F) in July. Nighttime lows range from -5°C (23°F) to 20°C (68°F). Temperatures vary considerably through the year.
How much rain does Arnold get?
Annual rainfall is around 1196 mm (47 in). April is the wettest month with 142 mm (5.6 in), while January is the driest with 54 mm (2.1 in).
How sunny is Arnold?
Arnold receives around 2,594 hours of sunshine per year. July is the sunniest month with 311 hours, while December is the cloudiest with just 128 hours. Overall, Arnold enjoys abundant sunshine.
Arnold 3-Day Forecast
Arnold (MO) 3-Day Forecast
Arnold on the map
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