Nampa Weather in September

In Nampa, September brings moderate daytime temperatures around 12°C (54°F), with nights cooling to 4°C (39°F). Expect quite a bit of rainfall this month.

Rainfall in Nampa in September

Typically, you can expect about 18 days of rain this month, with 67 mm (2.6 in) on average. Expect plenty of grey, overcast days rather than intense storms. The rain rarely amounts to much on any given day.

Temperature in Nampa in September

Nampa in September gets highs of 12°C (54°F) during the day and drops to 4°C (39°F) at night. Conditions are often most pleasant around the middle of the day. Nights fall to 4°C (39°F), which is cold enough to feel it indoors too. A good thick duvet makes all the difference for a comfortable night's sleep.

Sunshine in Nampa in September

You can expect a moderate amount of sunlight, with approximately 112 hours. This means a pleasant mix of sun and overcast.

If you prefer dry days with pleasant temperatures, July typically offers the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.