Boise (ID) Temperatures: Monthly Averages and Year-Round Insights

On this page, we’ll explore Boise’s temperature statistics in detail, including day and night variations and monthly averages. We’ll also compare the annual temperature to other cities in the United States of America.

Monthly Temperature Averages

Visitors to Boise can expect significant temperature changes throughout the year. Average maximum daytime temperatures reach a very warm 34°C in July. In January, the coolest month of the year, temperatures drop to a chilly 4°C. At night, minimum temperatures can drop even lower, averaging around -5°C.

The chart below illustrates the average maximum day and minimum night temperatures in Boise by month:

The minimum temperature is often recorded between 4 AM and 6 AM, while the highest temperature is usually reached at 3 PM. During this time the sun's heating effect is the strongest. July, the city’s warmest month receives 399 hours of sunshine.

The chart below shows the average temperature throughout the year:

July, the city’s warmest month, also receives about 8.4 mm of snow/rainfall spread over roughly 4 days. For more information, please visit our Boise Precipitation page.

Annual Temperatures in the United States of America Compared

The map below shows the annual temperature across the United States of America. You can also select the different months in case you are interested in a specific month.

Annual

Annual

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Legend

very warm

warm

pleasant

moderate

cold

very cold

Very warm means maximum temperatures above 30°C. Warm: 22°C to 30°C. Pleasant: 18°C to 22°C Moderate: 12°C to 18°C. Cold: 2°C to 12°C. Very cold: lower than 2°C

Boise Temperatures Compared World Wide

Boise’s average annual maximum temperature is 18°C. Let’s compare this with some popular tourist destinations:

Seville, Spain, stands out with its warm Mediterranean climate and an average annual temperature of 23°C.

Meanwhile, Queenstown, New Zealand, the average annual temperature is significantly lower at 10°C, with mild summers and cold winters.

Beijing, China, experiences more extreme temperature shifts, but still averaging 20°C annually.

Melbourne, Australia, has a slightly cooler climate, with an average annual temperature of 20°C.

How does the temperature feel?

Humidity is an essential factor in how you experience temperature. When a warm period is accompanied by high humidity, it results in a higher perceived temperature. This is especially true when temperatures exceed 25°C, as it can cause greater discomfort.

On the other hand, in cooler months, especially when temperatures dip below 10°C, high humidity can intensify the cold. This makes the air feel much colder than it really is.

In Boise, during the coolest month, January, you will experience 75% humidity, which is considered high. This is accompanied by an average maximum temperature of 4°C. In the warmest month, July, the humidity is 36% combined with an average maximum temperature of 34°C, which creates a low-feel temperature. Explore our detailed page on humidity levels for further details.

How are these Temperatures Measured?

Generally, temperature data depicting climate is usually given over a 30-year average in order to reduce short-term fluctuations and reveal better long-term trends in climate conditions.

This temperature data is taken from land-based thermometers, ocean buoys, ships, and satellites. These measurements are transmitted to weather stations and climate centers around the globe where they are processed, averaged, and analyzed in order to monitor the trends and create climate models.