Waterloo (IA) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Waterloo.
Climate overview of Waterloo
Waterloo, Iowa, United States of America, sees big temperature differences between seasons, with July peaking at 29°C (84°F) and January dropping to -3°C (27°F).
The city receives around 970 mm (38 in) of rain/snowfall per year. It experiences a distinct dry season from January to February, with warm summers and very cold winters. June is the wettest month and January the driest.
Waterloo Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Waterloo - and find the best time to visit.
Monthly Temperature in Waterloo
Visitors to Waterloo can expect significant temperature changes throughout the year. On average, daytime temperatures range from a comfortable 29°C (84°F) in July to a very cold -3°C (27°F) in January.
Nighttime temperatures range from 17°C (63°F) in July to -13°C (9°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Waterloo
Generally, Waterloo experiences moderate precipitation patterns, averaging 970 mm (38 in) yearly. The seasons in Waterloo bring significant changes in precipitation. The wettest month, June, receives high rainfall, with an average of 144 mm (5.7 in) of precipitation. This rainfall is distributed across 14 rainy days.
In contrast, the driest month, January, experiences much less snowfall, totaling 22 mm (0.9 in) over 8 snowy days. These distinct seasonal differences provide diverse experiences throughout the year. For more details, please visit our Waterloo Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Best Time to Visit Waterloo
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: September
- Warmest weather: July and August
- Fewer rainy days: January, February, March, September and November
- Seasonal pattern: A distinct dry season from January to February, with warm summers and very cold winters
- Coldest conditions: January, with freezing nights around -13°C (9°F).
Frequently asked questions about the climate in Waterloo
What is the best time to visit Waterloo?
September typically offers the most optimal weather in Waterloo. In contrast, January, February, March, November and December tend to have less optimal conditions. Waterloo has a distinct dry season from January to February, with warm summers and very cold winters.
What temperatures can I expect in Waterloo?
Daytime highs range from -3°C (27°F) in January to 29°C (84°F) in July. Nighttime lows range from -13°C (9°F) to 17°C (63°F). Temperatures vary considerably through the year.
How much rain does Waterloo get?
Annual rainfall is around 970 mm (38 in). June is the wettest month with 144 mm (5.7 in), while January is the driest with 22 mm (0.9 in).
Waterloo 3-Day Forecast
Waterloo (IA) 3-Day Forecast
Waterloo on the map
Waterloo is highlighted - select any city to see its climate.
Popular this month
Where to go in July - average daytime high across popular destinations.
Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
Yosemite National Park is definitely worth a visit
Vast forests, blue lakes, towering sequoias, and majestic waterfalls hint at the beauty of Yosemite National Park—a true natural masterpiece.
The 10 most alternative cities in the United States
Discover the top 10 fun and alternative U.S. cities rich in art, culture, and adventure. From Portland's hippy charm to Sedona's stunning landscapes.
Sedona: Explore Majestic Red Rock Landscapes
A picturesque artists' town surrounded by red rocks and known for its spirituality, vortex energy, and stunning hikes like Cathedral Rock.
10 most idyllic villages to visit in the United States
Discover 10 idyllic villages in the USA, from California to Vermont. Explore their unique charm, rich history, stunning nature, and vibrant arts scenes.