Climate and monthly weather forecast
Waterloo, IA

Weather in January

January, the same as December, in Waterloo, Iowa, is a freezing cold winter month, with an average temperature varying between 12°F (-11.1°C) and 24.3°F (-4.3°C). January is the coldest month, with an average high-temperature of 24.3°F (-4.3°C) and an average low-temperature of 12°F (-11.1°C). Weather in January »

Weather in February

The last month of the winter, February, is another freezing cold month in Waterloo, Iowa, with an average temperature ranging between max 28.4°F (-2°C) and min 15.4°F (-9.2°C). In February, the average high-temperature is relatively the same as in January - a still freezing cold 28.4°F (-2°C). Weather in February »

Weather in March

The first month of the spring, March, is a chilly month in Waterloo, Iowa, with temperature in the range of an average high of 44.1°F (6.7°C) and an average low of 29.7°F (-1.3°C). In Waterloo, the average high-temperature in March increases considerably from a freezing cold 28.4°F (-2°C) in February to a chilly 44.1°F (6.7°C). Weather in March »

Weather in April

April is a moderate spring month in Waterloo, Iowa, with an average temperature fluctuating between 40.1°F (4.5°C) and 56.8°F (13.8°C). In Waterloo, the average high-temperature in April increases from a chilly 44.1°F (6.7°C) in March to a mild 56.8°F (13.8°C). Weather in April »

Weather in May

May, the last month of the spring in Waterloo, is a pleasant month, with temperature in the range of an average high of 68.2°F (20.1°C) and an average low of 51.6°F (10.9°C). In Waterloo, the average high-temperature in May rises from a moderate 56.8°F (13.8°C) in April to a pleasant 68.2°F (20.1°C). Weather in May »

Weather in June

June, the first month of the summer in Waterloo, is a warm month, with temperature in the range of an average high of 77.7°F (25.4°C) and an average low of 61.3°F (16.3°C). In Waterloo, Iowa, the average high-temperature in June rises from an agreeable 68.2°F (20.1°C) in May to a warm 77.7°F (25.4°C). Weather in June »

Weather in July

July, the same as June, is another warm summer month in Waterloo, Iowa, with an average temperature ranging between max 80.1°F (26.7°C) and min 63.1°F (17.3°C). The warmest month is July, with an average high-temperature of 80.1°F (26.7°C) and an average low-temperature of 63.1°F (17.3°C). Weather in July »

Weather in August

August, the last month of the summer in Waterloo, is another warm month, with an average temperature ranging between min 61°F (16.1°C) and max 78.6°F (25.9°C). In August, the average high-temperature is almost the same as in July - a still moderately hot 78.6°F (25.9°C). Weather in August »

Weather in September

The first month of the autumn, September, is also an agreeable month in Waterloo, Iowa, with an average temperature varying between 54.5°F (12.5°C) and 73.2°F (22.9°C). In September, the average high-temperature slightly decreases from a moderately hot 78.6°F (25.9°C) in August to a pleasant 73.2°F (22.9°C). Weather in September »

Weather in October

October, the same as September, in Waterloo, Iowa, is a moderate autumn month, with temperature in the range of an average low of 43.5°F (6.4°C) and an average high of 58.5°F (14.7°C). In October, the average high-temperature plummets from an agreeable 73.2°F (22.9°C) in September to a mild 58.5°F (14.7°C). Weather in October »

Weather in November

November, the last month of the autumn in Waterloo, is another chilly month, with an average temperature varying between 31.1°F (-0.5°C) and 44.1°F (6.7°C). In Waterloo, Iowa, the average high-temperature in November drops from a moderate 58.5°F (14.7°C) in October to a chilly 44.1°F (6.7°C). Weather in November »

Weather in December

The first month of the winter, December, is also a subzero cold month in Waterloo, Iowa, with an average temperature fluctuating between 20.5°F (-6.4°C) and 31.1°F (-0.5°C). In Waterloo, the average high-temperature in December drops from a frosty 44.1°F (6.7°C) in November to a freezing cold 31.1°F (-0.5°C). Weather in December »
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FAQ

What is the coldest month in Waterloo?

The coldest month is January, with an average high-temperature of 24.3°F (-4.3°C) and an average low-temperature of 12°F (-11.1°C).

What is the most humid month in Waterloo?

The most humid month is January, with an average relative humidity of 87%.

What is the driest month in Waterloo?

The months with the least rainfall in Waterloo, Iowa, are January and February Rain falls for 4.1 days and accumulates 1.02" (26mm) of rain.

How many days does it rain in Waterloo?

Throughout the year, in Waterloo, Iowa, there are 133.6 rainfall days, and 28.27" (718mm) of precipitation is accumulated.

When does it snow in Waterloo?

Months with snowfall are January through May, October through December.

What is the snowiest month in Waterloo?

The month with the most snowfall in Waterloo is January, when snow falls for 11.5 days and typically aggregates up to 4.21" (107mm) of snow.

How much does it snow in Waterloo?

In Waterloo, Iowa, during the entire year, snow falls for 41.6 days and aggregates up to 15.24" (387mm) of snow.

What is the month with the least sunshine in Waterloo?

January has the least sunshine of the year in Waterloo, Iowa, with an average of 3.8h of sunshine.

When is Daylight Saving Time (DST) in Waterloo?

On Sunday, March 13. 2022, at 2:00 am, Daylight Saving Time starts in Waterloo, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 6. 2022, at 2:00 am, and the time zone reverts from CDT to CST.

What is the wettest month in Waterloo?

June is the month with the most rainfall. Rain falls for 18.1 days and accumulates 4.29" (109mm) of precipitation.

When it does not snow in Waterloo?

In Waterloo, Iowa, snow does not fall in June through September.

When are the longest days in Waterloo?

The month with the longest days is June, with an average of 15h and 15min of daylight.

What is the month with the highest UV index in Waterloo?

The month with the highest UV index in Waterloo is June, with an average maximum UV index of 6.

What is the warmest month in Waterloo?

July is the warmest month in Waterloo, with an average high-temperature of 80.1°F (26.7°C) and an average low-temperature of 63.1°F (17.3°C).

What month has the most sunshine in Waterloo?

The month with the most sunshine is July, with an average of 9.9h of sunshine.

What is the least humid month in Waterloo?

With an average relative humidity of 72%, October is the least humid month.

What is the month with the shortest days in Waterloo?

The month with the shortest days in Waterloo is December, with an average of 9h and 8min of daylight.

What is the month with the lowest UV index in Waterloo?

December is the month with the lowest UV index, with an average maximum UV index of 1.

Average temperature
Waterloo, IA

Average temperature - Waterloo, IA

The warmest month (with the highest average high temperature) is July (80.1°F).
The month with the lowest average high temperature is January (24.3°F).

The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (12°F).

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Average pressure
Waterloo, IA

Average pressure - Waterloo, IA

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).

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Average wind speed
Waterloo, IA

Average wind speed - Waterloo, IA

The windiest month (with the highest average wind speed) is April (10.8mph).
The calmest month (with the lowest average wind speed) is August (7mph).

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Average rainfall
Waterloo, IA

Average rainfall - Waterloo, IA

The wettest month (with the highest rainfall) is June (4.29").
The driest months (with the least rainfall) are January and February (1.02").

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Average rainfall days
Waterloo, IA

Average rainfall days - Waterloo, IA

The month with the highest number of rainy days is June (18.1 days).
The month with the least rainy days is February (4 days).

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Average snowfall
Waterloo, IA

Average snowfall - Waterloo, IA

The month with the highest snowfall is January (4.21").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days
Waterloo, IA

Average snowfall days - Waterloo, IA

The month with the highest number of snowfall days is January (11.5 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight / Average sunshine
Waterloo, IA

Average daylight / Average sunshine - Waterloo, IA

The month with the longest days is June (Average daylight: 15h and 15min).
The month with the shortest days is December (Average daylight: 9h and 8min).

The month with the most sunshine is July (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).

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Average sunshine days
Waterloo, IA

Average sunshine days - Waterloo, IA

The month with the most sunshine days is October (17.8 days).
The month with the least sunshine days is June (10 days).

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Average visibility
Waterloo, IA

Average visibility - Waterloo, IA

The months with the highest visibility are February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, July and August (5mi).

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