Walnut (IA) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Walnut.
Climate overview of Walnut
Temperatures in Walnut, Iowa, United States of America, vary greatly throughout the year. July is the hottest month at 29°C (84°F), while January is the coldest at -1°C (30°F).
With around 963 mm (38 in) of annual rain/snowfall, the city has moderate precipitation levels. June is the wettest month and January the driest. It also has a distinct dry season from January to February, with warm summers and very cold winters. July is the sunniest month, averaging 11.2 hours of sunshine per day.
Walnut Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Walnut - and find the best time to visit.
Monthly Temperature in Walnut
The climate in Walnut is known for significant temperature differences throughout the year, making the weather dynamic. Typically, average maximum daytime temperatures range from a comfortable 29°C (84°F) in July to a very cold -1°C (30°F) in the coolest month, January.
Nights vary from 17°C (63°F) in July to around -12°C (10°F) during the colder months.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Walnut
Generally, Walnut receives mid-range precipitation levels, with 963 mm (38 in) annually. The climate in Walnut shows significant variation throughout the year. Expect heavy rainfall in June, the wettest month, with an average of 163 mm (6.4 in) of precipitation over 14 rainy days.
In contrast, the driest month January offers drier and sunnier days, with around 15 mm (0.6 in) of snowfall over 5 snowy days. For more details, please visit our Walnut 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 Walnut
For those who appreciate different seasons, Walnut serves as an ideal destination. Expect longer, more sun-filled days in July with an average of 11.2 hours of sunshine daily, and embrace the darker days in December, offering only 4.4 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 Walnut by Month
The relative humidity is high throughout the year in Walnut.
The city experiences its highest humidity in January, reaching 71%. In April, the humidity drops to its lowest level at 60%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Walnut
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: July and September
- Warmest weather: June, July and August
- Most sunshine: July
- Fewest rainy days: January and November
- Seasonal pattern: A distinct dry season from January to February, with warm summers and very cold winters
- Coldest conditions: January, with freezing nights around -12°C (10°F).
Frequently asked questions about the climate in Walnut
What is the best time to visit Walnut?
July and September typically offer the most optimal weather in Walnut. In contrast, January, February, March and December tend to have less optimal conditions. Walnut has a distinct dry season from January to February, with warm summers and very cold winters.
What temperatures can I expect in Walnut?
Daytime highs range from -1°C (30°F) in January to 29°C (84°F) in July. Nighttime lows range from -12°C (10°F) to 17°C (63°F). Temperatures vary considerably through the year.
How much rain does Walnut get?
Annual rainfall is around 963 mm (38 in). June is the wettest month with 163 mm (6.4 in), while January is the driest with 15 mm (0.6 in).
How sunny is Walnut?
Walnut receives around 2,736 hours of sunshine per year. July is the sunniest month with 335 hours, while December is the cloudiest with just 133 hours. Overall, Walnut enjoys abundant sunshine.
Walnut 3-Day Forecast
Walnut (IA) 3-Day Forecast
Walnut on the map
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