Caldwell, Idaho Weather by Month

Caldwell, Idaho Weather by Month

Introduction to Caldwell, Idaho

Caldwell is a city located in Canyon County in the southwestern part of the U.S. state of Idaho. Situated in the Treasure Valley, Caldwell is part of the Boise metropolitan area, offering a blend of small-town charm and access to urban amenities. The city lies along the Boise River and boasts a rich history that dates back to its founding in the late 19th century.

Geographically, Caldwell is positioned at approximately 43.66°N latitude and 116.69°W longitude, covering an area of about 22.1 square miles. The city has a population of around 58,000 residents, making it one of the larger cities in Idaho. Caldwell is known for its vibrant community, agricultural roots, and educational institutions.

One of the most notable institutions in Caldwell is the College of Idaho, a private liberal arts college that significantly contributes to the cultural and educational landscape of the region. The city is also home to several major landmarks, including the historic downtown district, Indian Creek Plaza, and various parks and recreational facilities that highlight its community-oriented spirit.

Climate and Weather Overview

Caldwell, Idaho, experiences a semi-arid climate characterized by hot, dry summers and cold, relatively wet winters. The climate is influenced by its location in the Treasure Valley, resulting in significant seasonal variations and a generally sunny and dry climate year-round.

Average Monthly Climate Data

Month Average Temperature (°F) Average Precipitation (inches) Average Sunny Days
January 30.2 1.2 14
February 35.1 1.0 15
March 44.5 1.2 17
April 51.7 1.1 18
May 60.7 1.3 21
June 69.2 0.9 26
July 75.6 0.3 30
August 74.1 0.4 29
September 65.2 0.6 26
October 52.4 0.9 21
November 40.1 1.2 16
December 31.0 1.3 14

Weather by Month in Caldwell, Idaho


January in Caldwell is typically the coldest month of the year. Average temperatures range from a low of around 22°F to a high of about 38°F. Precipitation is relatively low, averaging around 1.2 inches, mostly in the form of snow.

Natural disasters such as severe winter storms can occur, but they are relatively rare. Recommended activities include indoor pursuits such as visiting local museums, enjoying the cozy atmosphere of local cafes, or participating in winter sports like ice skating at nearby rinks.


February sees a slight warming trend with average temperatures ranging from 26°F to 44°F. Precipitation remains low at around 1.0 inches, with occasional snowfall.

Outdoor activities become more viable as the weather starts to improve. Hiking in the nearby foothills or exploring early signs of spring in local parks are popular pastimes.


March marks the beginning of spring with average temperatures climbing to between 31°F and 56°F. Precipitation averages around 1.2 inches, with more frequent rain showers.

The emergence of blooming flowers makes it a beautiful time for outdoor activities. Garden tours, hiking, and visiting nature reserves are recommended. Natural disasters such as floods are uncommon but possible during this transition period.


April sees a more noticeable shift to warmer weather with temperatures ranging from 37°F to 64°F. Precipitation decreases slightly to 1.1 inches, and the number of sunny days increases.

This month is ideal for outdoor activities like picnicking, biking, and visiting local farmers’ markets. The risk of severe weather is low, making it one of the most pleasant months to enjoy Caldwell.


May brings even warmer temperatures, ranging from 45°F to 72°F. Precipitation remains moderate at 1.3 inches. The abundance of sunshine makes it perfect for outdoor adventures.

Residents and visitors can enjoy activities like gardening, hiking, and attending local festivals. The likelihood of severe weather remains low, making it a great time to explore the area.


June heralds the start of summer with average temperatures ranging from 52°F to 82°F. Precipitation averages around 0.9 inches, often in the form of brief rain showers.

Outdoor activities such as swimming, boating, and picnics are popular. The weather is generally favorable with a high number of sunny days, making it an excellent time for outdoor exploration.


July is typically the hottest month in Caldwell, with temperatures ranging from 57°F to 91°F. Precipitation is minimal at 0.3 inches, making it the driest month of the year.

Despite the heat, outdoor activities like attending local fairs, swimming, and exploring state parks are common. Residents should stay hydrated and take precautions against heat-related illnesses.


August continues the summer heat with temperatures ranging from 56°F to 89°F. Precipitation remains low at 0.4 inches, and the number of sunny days is high.

The weather remains suitable for outdoor activities, including water sports and hiking. It’s important to monitor weather reports for any severe thunderstorms that may occur.


September brings a gradual cooling with temperatures ranging from 48°F to 79°F. Precipitation averages around 0.6 inches, and the number of sunny days starts to decrease.

This month is ideal for outdoor activities such as apple picking, hiking, and attending fall festivals. The risk of severe weather is low, making it a pleasant time to enjoy the outdoors.


October sees more significant cooling with temperatures ranging from 38°F to 65°F. Precipitation averages around 0.9 inches, and sunny days are abundant.

Fall foliage makes this month particularly scenic, ideal for outdoor photography, hiking, and visiting pumpkin patches. Natural disasters are rare in October.


November temperatures range from 29°F to 52°F, with precipitation averaging 1.2 inches. The weather becomes cooler, and the number of sunny days decreases.

Outdoor activities like hiking and visiting local markets are still enjoyable. As the holiday season approaches, indoor activities and local events become more popular.


December brings cooler temperatures, ranging from 23°F to 41°F, and precipitation averages around 1.3 inches. Snow is more common, adding a festive atmosphere to the city.

Indoor activities such as visiting museums and historical sites are recommended. The festive season also brings various local events and holiday markets to enjoy.


Caldwell, Idaho, offers a diverse climate with distinct seasons, making it a charming place to visit or live throughout the year. Whether you prefer the vibrant blooms of spring, the sunny warmth of summer, the colorful foliage of autumn, or the snowy winters, Caldwell has something to offer for every season. By understanding the weather patterns and planning activities accordingly, residents and visitors can make the most of their time in this picturesque Idaho city.

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