Nampa (ID) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Nampa.
Climate overview of Nampa
Temperatures in Nampa, Idaho, United States of America, vary greatly throughout the year. July is the hottest month at 34°C (93°F), while January is the coldest at 3°C (37°F).
The city tends toward dry conditions, with around 262 mm (10 in) of rain/snowfall per year. It does, however, have very little rainfall year-round, with very warm summers and cold winters. July is the sunniest month, averaging 13.3 hours of sunshine per day.
Nampa Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Nampa - and find the best time to visit.
Monthly Temperature in Nampa
The climate in Nampa is known for significant temperature differences throughout the year, making the weather dynamic. Typically, average maximum daytime temperatures range from a very warm 34°C (93°F) in July to a chilly 3°C (37°F) in the coolest month, January.
Nights vary from 15°C (59°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 Nampa
Nampa maintains relatively dry conditions year-round, recording average annual precipitation of 262 mm (10 in). The climate in Nampa shows significant variation throughout the year. Expect moderate snow/rainfall in December, the wettest month, with an average of 40 mm (1.6 in) of precipitation over 12 snowy/rainy days.
In contrast, the driest month August offers drier and sunnier days, with around 5.4 mm (0.2 in) of rainfall over 2 rainy days. For more details, please visit our Nampa 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 Nampa
For those who appreciate different seasons, Nampa serves as an ideal destination. Expect longer, more sun-filled days in July with an average of 13.3 hours of sunshine daily, and embrace the darker days in December, offering only 3.4 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 Nampa by Month
The relative humidity is moderate throughout the year in Nampa.
The city experiences its highest humidity in January, reaching 75%. In July, the humidity drops to its lowest level at 36%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Nampa
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: May, June, September and October
- Warmest weather: July
- Most sunshine: July
- Fewest rainy days: July, August and September
- Seasonal pattern: Very little rainfall year-round, with very warm summers and cold winters
- Coldest conditions: January, with freezing nights around -5°C (23°F).
Frequently asked questions about the climate in Nampa
What is the best time to visit Nampa?
May, June, September and October typically offer the most optimal weather in Nampa. In contrast, January, July and December tend to have less optimal conditions. Nampa has very little rainfall year-round, with very warm summers and cold winters.
What temperatures can I expect in Nampa?
Daytime highs range from 3°C (37°F) in January to 34°C (93°F) in July. Nighttime lows range from -5°C (23°F) to 15°C (59°F). Temperatures vary considerably through the year.
How much rain does Nampa get?
Annual rainfall is around 262 mm (10 in). December is the wettest month with 40 mm (1.6 in), while August is the driest with 5.4 mm (0.2 in). In the coldest months, precipitation may fall as snow/rain.
How sunny is Nampa?
Nampa receives around 2,983 hours of sunshine per year. July is the sunniest month with 399 hours, while December is the cloudiest with just 103 hours. Overall, Nampa enjoys abundant sunshine.
Nampa 3-Day Forecast
Nampa (ID) 3-Day Forecast
Nampa on the map
Nampa is highlighted - select any city to see its climate.
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