Arnold, Missouri Weather by Month

Introduction to Arnold, Missouri

Arnold is a vibrant city located in Jefferson County in the southeastern part of the U.S. state of Missouri. Situated along the banks of the Meramec River and just a short drive south of St. Louis, Arnold offers a unique blend of small-town charm and convenient access to urban amenities. The city’s proximity to major highways, including Interstate 55, makes it a hub for commerce and commuting.

Geographically, Arnold is positioned at approximately 38.43°N latitude and 90.37°W longitude, encompassing an area of about 12.25 square miles. The city has a population of around 21,000 residents, making it one of the larger communities in Jefferson County.

Arnold is home to several notable companies and landmarks. One of the most prominent employers is Anheuser-Busch, which operates a significant facility in the area. Additionally, the city is known for the Arnold Water Tower, a local landmark that has become synonymous with the community. Educationally, Arnold is served by the Fox C-6 School District, providing quality education to its residents. The city also boasts numerous parks and recreational facilities, including the Arnold Recreation Center and the scenic Strawberry Creek Nature Area.

Climate and Weather Overview

Arnold, Missouri, experiences a humid subtropical climate characterized by hot, humid summers and mild to cool winters. The climate is influenced by its location in the central United States, resulting in significant seasonal variations and a generally humid climate year-round.

Average Monthly Climate Data

Month Average Temperature (°F) Average Precipitation (inches) Average Sunny Days
January 33.8 2.2 10
February 37.9 2.4 11
March 47.9 3.4 12
April 58.8 4.0 14
May 68.8 4.6 16
June 77.6 4.1 17
July 81.8 4.0 19
August 80.2 3.2 18
September 73.1 3.4 16
October 61.7 3.1 14
November 49.4 3.3 11
December 37.9 2.7 9

Weather by Month in Arnold, Missouri


January in Arnold is typically the coldest month of the year. Average temperatures range from a low of around 23°F to a high of about 43°F. Precipitation is relatively low, averaging around 2.2 inches, mostly in the form of snow. The city typically enjoys about 10 sunny days during this month.

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 48°F. Precipitation remains low at around 2.4 inches, with occasional snowfall. The number of sunny days increases to around 11 days.

Outdoor activities become more viable as the weather starts to improve. Exploring early signs of spring in local parks or enjoying a stroll along the Meramec River are popular pastimes.


March marks the beginning of spring with average temperatures climbing to between 36°F and 60°F. Precipitation averages around 3.4 inches, with more frequent rain showers. Arnold typically experiences around 12 sunny days during this month.

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 severe thunderstorms can occur, so it’s important to stay informed about weather conditions.


April sees a more noticeable shift to warmer weather with temperatures ranging from 46°F to 71°F. Precipitation increases to 4.0 inches, and the number of sunny days increases to around 14.

This month is ideal for outdoor activities like picnicking, biking, and visiting local farmers’ markets. The risk of severe weather, including thunderstorms and tornadoes, begins to rise, making it important to stay prepared.


May brings even warmer temperatures, ranging from 56°F to 79°F. Precipitation remains moderate at 4.6 inches. The abundance of sunshine, with about 16 sunny days, makes it perfect for outdoor adventures.

Residents and visitors can enjoy activities like gardening, hiking, and attending local festivals. May is also known for severe weather, including tornadoes, so it is crucial to have a safety plan in place.


June heralds the start of summer with average temperatures ranging from 65°F to 87°F. Precipitation averages around 4.1 inches, often in the form of brief but intense thunderstorms. Arnold typically experiences around 17 sunny days in June.

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. However, be prepared for potential severe weather.


July is typically the hottest month in Arnold, with temperatures ranging from 69°F to 90°F. Precipitation is around 4.0 inches, making it a relatively wet month. Arnold enjoys about 19 sunny days during this month.

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 67°F to 88°F. Precipitation remains low at 3.2 inches, and the number of sunny days is around 18.

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 59°F to 82°F. Precipitation averages around 3.4 inches, and the number of sunny days starts to decrease to about 16.

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 47°F to 72°F. Precipitation averages around 3.1 inches, and sunny days are around 14.

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 36°F to 59°F, with precipitation averaging 3.3 inches. The weather becomes cooler, and the number of sunny days decreases to about 11.

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 27°F to 50°F, and precipitation averages around 2.7 inches. Snow is more common, adding a festive atmosphere to the city. Arnold experiences around 9 sunny days during this month.

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

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