Alton, Illinois Weather by Month

Alton, located in southwestern Illinois along the Mississippi River, is a historic city with a rich heritage and diverse cultural offerings. Situated approximately 15 miles north of St. Louis, Missouri, Alton is part of the St. Louis Metropolitan Area and serves as a gateway to the scenic Great Rivers National Scenic Byway. With a population of around 26,000 residents, Alton boasts a blend of urban amenities and small-town charm, making it an attractive destination for both residents and visitors alike. The city’s location along the river provides opportunities for outdoor recreation, including boating, fishing, and birdwatching, while its historic downtown area features well-preserved architecture, unique shops, and a variety of dining options. Major landmarks in Alton include the Alton Museum of History and Art, the Robert Wadlow Statue (honoring the world’s tallest man), and the Lewis and Clark State Historic Site, commemorating the famous explorers’ expedition. Alton is also known for its vibrant arts scene, with galleries, theaters, and live music venues showcasing local talent and cultural events throughout the year. Whether exploring its historic sites, enjoying outdoor activities along the river, or immersing oneself in its cultural offerings, Alton offers something for everyone to enjoy.

Climate and Weather Overview

Alton experiences a humid subtropical climate with four distinct seasons, characterized by hot, humid summers and cold, snowy winters. Situated in the Midwestern United States, the city’s climate is influenced by its proximity to the Mississippi River and its location within the Mississippi River Valley. Summers in Alton are typically warm and muggy, with average temperatures ranging from the upper 60s to low 90s Fahrenheit (around 20-33°C). Winters are cold and snowy, with average temperatures ranging from the upper 20s to mid-40s Fahrenheit (around -2 to 7°C). Spring and fall bring mild temperatures and moderate precipitation, making them ideal seasons for outdoor activities and sightseeing. Overall, Alton experiences a diverse range of weather conditions throughout the year, providing residents and visitors with opportunities to enjoy a variety of seasonal activities and attractions.

Average Climate Data

Below is a table detailing the average temperature, precipitation, and sunny days for each month in Alton:

Month Average Temperature (°F) Average Precipitation (inches) Sunny Days
January 35°F 2.15 inches 7 days
February 39°F 2.20 inches 8 days
March 50°F 3.48 inches 9 days
April 61°F 3.86 inches 10 days
May 71°F 4.29 inches 11 days
June 81°F 3.86 inches 10 days
July 86°F 3.24 inches 10 days
August 84°F 3.11 inches 9 days
September 77°F 2.84 inches 8 days
October 65°F 2.90 inches 7 days
November 52°F 3.89 inches 6 days
December 40°F 2.92 inches 6 days

Weather by Month

January

January in Alton brings cold temperatures and occasional snowfall, with average highs around 35°F (2°C). The city experiences moderate precipitation, often in the form of snow or freezing rain. While outdoor activities may be limited during snowy periods, residents and visitors can still enjoy indoor attractions, cultural events, and recreational activities.

Recommended Activities:

  • Visiting the Alton Museum of History and Art
  • Exploring the exhibits at the National Great Rivers Museum
  • Attending performances at the Jacoby Arts Center

February

February maintains cold temperatures in Alton, with average highs reaching 39°F (4°C). The city experiences moderate precipitation, with occasional snowfall and icy conditions. While outdoor activities may be limited during snowy periods, visitors can still explore indoor attractions, attend cultural events, and participate in winter sports and recreational activities.

Recommended Activities:

  • Hiking or birdwatching at Gordon F. Moore Community Park
  • Exploring the historic architecture of Downtown Alton
  • Attending the Alton Symphony Orchestra concert

March

March marks the transition to spring in Alton, with temperatures warming up to around 50°F (10°C). The city experiences increasing sunshine and longer daylight hours, making it an ideal time for outdoor activities and sightseeing. Visitors can explore local parks and nature trails, go hiking or biking, or attend community events and festivals celebrating the season.

Recommended Activities:

  • Hiking along the trails of Rock Spring Park
  • Exploring the historic sites along the Meeting of the Great Rivers National Scenic Byway
  • Attending the Mississippi Earthtones Festival

April

April brings mild temperatures and blooming flowers to Alton, with average highs reaching 61°F (16°C). The city experiences moderate precipitation, but sunny days prevail, providing residents and visitors with ample opportunities for outdoor recreation. Visitors can hike or bike along scenic trails, go birdwatching or wildlife viewing, or attend spring festivals and events celebrating the region’s natural beauty.

Recommended Activities:

  • Exploring the Great River Road Wine Trail
  • Attending the Annual Spring Wildflower Market
  • Taking a scenic drive along the Great Rivers National Scenic Byway

May

May heralds the arrival of warmer temperatures and longer days in Alton, with average highs reaching 71°F (22°C). The city experiences increasing sunshine and decreasing precipitation, making it an ideal time for outdoor activities and leisure pursuits. Visitors can go boating or fishing on the Mississippi River, attend outdoor concerts and performances, or explore local parks and gardens in full bloom.

Recommended Activities:

  • Boating or kayaking on the Mississippi River
  • Attending the Alton Farmer’s Market
  • Exploring the gardens at the Lewis and Clark Confluence Tower

June

June in Alton brings warm temperatures and abundant sunshine, with average highs around 81°F (27°C). The city experiences low precipitation and clear skies, providing residents and visitors with perfect weather for outdoor adventures. Visitors can go camping or picnicking in local parks, attend outdoor festivals and events, or explore scenic overlooks and hiking trails along the river.

Recommended Activities:

  • Picnicking at Rock Springs Park
  • Attending the Alton Expo Summer Concert Series
  • Exploring the Piasa Bird mural and lookout point

July

July in Alton brings hot and humid weather, with average highs around 86°F (30°C). The city experiences occasional rainfall and thunderstorms, but sunny days prevail, providing residents and visitors with plenty of opportunities for outdoor recreation. Visitors can go boating or swimming in local lakes and rivers, attend Fourth of July celebrations and fireworks displays, or enjoy outdoor concerts and performances.

Recommended Activities:

  • Boating or fishing on the Mississippi River
  • Attending the Alton Fireworks Spectacular
  • Exploring the scenic beauty of Pere Marquette State Park

August

August maintains hot and humid conditions in Alton, with average highs around 84°F (29°C). The city experiences occasional rainfall and thunderstorms, but sunny days are still prevalent, making it an ideal time for outdoor activities and leisure pursuits. Visitors can go hiking or biking on scenic trails, attend county fairs and agricultural festivals, or explore local parks and nature reserves.

Recommended Activities:

  • Hiking or biking along the Sam Vadalabene Bike Trail
  • Attending the Madison County Fair
  • Exploring the gardens at the Alton Visitor Center

September

September brings cooler temperatures and changing foliage to Alton, with average highs around 77°F (25°C). The city experiences decreasing humidity levels and clear skies, making it an ideal time for outdoor activities and sightseeing. Visitors can go hiking or biking on scenic trails, attend fall festivals and events, or explore local farms and orchards offering seasonal produce and activities.

Recommended Activities:

  • Apple picking at Eckert’s Orchard
  • Hiking along the Great River Road Trail
  • Attending the Alton Jazz and Wine Festival

October

October marks the peak of fall foliage season in Alton, with temperatures cooling down to around 65°F (18°C). The city experiences crisp mornings and mild afternoons, perfect for outdoor adventures and scenic drives through the countryside. Visitors can go leaf-peeping in nearby parks and forests, attend fall festivals celebrating the harvest season, or enjoy outdoor activities such as hiking, biking, and picnicking amidst the changing foliage and crisp autumn air.

Recommended Activities:

  • Exploring the historic sites along the Underground Railroad Freedom Trail
  • Attending the Great Godfrey Maze
  • Visiting local pumpkin patches and corn mazes

November

November brings cool temperatures and occasional frost to Alton, with average highs reaching 52°F (11°C). The city experiences increasing cloud cover and occasional rainfall, but outdoor activities are still possible with proper attire and preparation. Visitors can explore local parks and nature reserves, go birdwatching or wildlife viewing, or attend holiday events and festivals celebrating the season.

Recommended Activities:

  • Birdwatching at Gordon F. Moore Community Park
  • Exploring the exhibits at the Alton Museum of History and Art
  • Attending the Christmas Wonderland Holiday Light Display

December

December in Alton brings cold temperatures and occasional snowfall, with average highs around 40°F (4°C). The city experiences shorter daylight hours and festive holiday decorations, creating a cozy atmosphere for residents and visitors alike. While outdoor activities may be limited during snowy periods, indoor attractions, including museums, theaters, and holiday markets, provide entertainment and recreation for all ages.

Recommended Activities:

  • Ice skating at the East Alton Ice Arena
  • Visiting the Lincoln-Douglas Square
  • Attending holiday concerts and events in the area

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