Climate and monthly weather forecast
Marion, IA


The climate of Marion

Nestled in the heart of the USA is the city of Marion, Iowa. Predominantly characterized by the Köppen climate classification as Dfa - a humid continental zone with no dry season and hot summers. This marks the climate of Marion with prominent seasonal variations throughout the year and a moderately high humidity, prevalent almost every month with slight fluctuations. The temperature, humidity, and pressure create a particular weather pattern distinct to Marion, making it a city of contrasts when it comes to weather conditions.

Throughout the year, temperatures fluctuate between minimum of 14.2°F (-9.9°C) in winter to maximum of 80.2°F (26.8°C) in summer. Humidity varies, extending from a low of 73% to a high of 85%. Substantial variations in pressure and cloud cover percentage are also prevalent throughout the year. Rainfall ranges from a light 1.34" (34mm) to a heavier 5" (127mm), with May being the wettest month. During the colder months, snowfall is also a common occurrence, with December to February being the peak snowfall period.

Residents of Marion experience a decent amount of sunlight throughout the year. Sunshine hours peak at 9.8 hours in the middle of the year. Saliently, strong winds are quite common, reaching a maximum speed of 16.8mph (27km/h), adding another dynamic aspect to the climate of Marion.

The best time to visit Marion

For most visitors, the ideal time for a comfortable and pleasant visit to Marion falls between May and September. During these months, temperatures are usually toasty, extending from a pleasant 57.9°F (14.4°C) to a high of 80.2°F (26.8°C). Humidity is moderate, making outings comfortable yet refreshingly cool. Additionally, there is ample daylight, up to 15.2 hours at the peak of the summer season, and a high amount of sunshine per day.

The worst time to visit Marion

Despite its classic charm, Marion can be a challenging destination during the winter months. From December to February, temperatures dive to a harsh low between 14.2°F (-9.9°C) to 33.1°F (0.6°C). Coupled with snowfall reaching a high of 5.79" (147mm) in December, outings might prove not only uncomfortable but also potentially risky. Limited sunlight and high winds only exacerbate the situation, making these winter months a difficult time for travel.

Spring weather in Marion

Spring in Marion, extending from March to May, sees gradual warming of temperatures, with lows rising from 30.7°F (-0.7°C) to highs of 68.9°F (20.5°C). Rainfall increases gradually throughout the spring, making way for the summer showers. It is also noteworthy that daylight increases progressively from 12 to 14.6 hours. Overall, spring presents a delightful balance of moderate temperatures, increasing rainfall, and steady wind speeds.

Summer weather in Marion

Summer, stretching from June to August, is the warmest time in Marion, with temperatures reaching a soaring high of 80.2°F (26.8°C). Humidity hits a peak of 84%, making the air thick and sweltering. Surprisingly, this is also the season with maximum daylight reaching a high of 15.2 hours. There is a drastic drop in rainfall from 5" (127mm) in May to 3.31" (84mm) in July, giving a bit of a breather from the otherwise drenching showers.

Autumn weather in Marion

Autumn months, from September to November, mark a noticeable decline in temperatures in Marion, dipping from 74.1°F (23.4°C) to a lower 45.3°F (7.4°C). Rainfall decreases gradually throughout the season, and the city experiences less daylight, making the weather cooler and the days shorter. The wind speeds, however, start picking up during this time, adding a crispness to the air.

Winter weather in Marion

The winter in Marion, from December to February, gets harshly cold, with a plunge in temperatures between 33.1°F (0.6°C) to 14.2°F (-9.9°C). The city wears a white blanket, with December and January being the peak snowfall months. Despite the decrease in daylight hours and high winds whipping across the city, an occasional sunny day brings a shimmering charm to the snow-laden city.

Weather in January

Begin the year with the chill of winter in Marion, Iowa where Covering the ground is snowfall totaling 5.79" (147mm). Residents adapt to the colder temperatures, layering clothing to stay warm and the city typically sees relatively high humidity adding to the discomfort. Weather in January »

Weather in February

While February still carries the chill of winter in Marion, Iowa, there's a slight uptick in temperature. With high humidity and snowy weather only slightly less than the previous month, February remains a month for winter wear. Weather in February »

Weather in March

As spring approaches, March sees an improvement in the weather at Marion, touching a high of 45.5°F (7.5°C). There's quite a significant reduction in snowfall, marking the transition from winter into spring. The skies also start to clear up, allowing for more daylight hours and consequently, a lot more direct sunlight. Weather in March »

Weather in April

With temperatures continually on the rise, April symbolizes the full arrival of spring in Marion, Iowa. There's a significant uptick in rainfall, with April showers becoming a common occurrence. The disappearance of snow is fully marked as the landscape takes on a fresh, rejuvenated look. Weather in April »

Weather in May

May ushers in peak spring season in Marion, and the temperature rises to a comfortable 68.9°F (20.5°C). The increased rainfall contributes to the lush greenery typical of the month, setting a picturesque natural backdrop. The lengthened daylight hours extend the possibilities for outdoor activities into the late evening. Weather in May »

Weather in June

June in Marion, Iowa brings the onset of summer, boasting the highest concentration of daylight hours for the year. Dry days are prevalent, and high temperatures become the norm. An increase in wind speed provides some relief from the hot and humid conditions. Weather in June »

Weather in July

July heat peaks in Marion with an average high temperature touching 80.2°F (26.8°C). Summery weather dominates the city, with people opting for cool clothing and hydrating drinks with typical summer accessories like sunglasses and sun hats being commonplace. Weather in July »

Weather in August

August continues the heat wave in Marion, Iowa, but temperatures begin to plateau. There is a noticeable drop in rainfall as summer reaches its zenith. Outdoor activities are still a favorite among residents, with plenty of daylight hours available for exploration or relaxation. Weather in August »

Weather in September

September brings a welcome change to the torrid summer heat in Marion. As fall commences, a gradual decrease in daylight hours signifies the impending cold weather. September is largely favorable weather-wise, with predominantly dry conditions and comfortable temperatures. Weather in September »

Weather in October

October in Marion, Iowa witnesses a more evident dip in temperature, signaling the strong onset of fall. Dry days with minimal rainfall make for beautiful outdoor moments. The city scenery transforms into a fall foliage spectacle, with leaves turning to vibrant hues of red, yellow, and orange. Weather in October »

Weather in November

November weather in Marion brings colder conditions, closely resembling the chill of winter. The combination of high humidity and wind speed enhances the cold, marking the end of fall. Cloudy skies become a familiar sight once more, reminding residents of the inevitable approach of winter. Weather in November »

Weather in December

Closing the year is the cold December weather in Marion. Winter conditions become fully pronounced in the city with 3.11" (79mm) of snow covering the ground. Iowans wrap up warmly, battling the freezing temperatures and reduced daylight hours. Weather in December »

Frequently asked questions

What are the coldest months in Marion?

January tends to be the coldest month in Marion, with temperatures averaging a daily high of 26.2°F (-3.2°C) and a low of 14.2°F (-9.9°C).

What is the most humid month in Marion?

January is the most humid month, with an average relative humidity of 85%.

What is the driest month in Marion?

The month with the least rainfall in Marion, Iowa, is January, when the rain falls for 5.2 days and typically collects 1.34" (34mm) of precipitation.

How much does it rain in Marion?

Throughout the year, in Marion, there are 147.9 rainfall days, and 31.57" (802mm) of precipitation is accumulated.

When does it snow in Marion?

Months with snowfall in Marion are January through April, October through December.

When does it snow the most in Marion?

January is the month with the most snowfall. Snow falls for 12.7 days and accumulates 5.79" (147mm) of snow.

How many days does it snow in Marion?

In Marion, Iowa, during the entire year, snow falls for 44 days and aggregates up to 18.35" (466mm) of snow.

What is the month with the least sunshine in Marion?

The month with the least sunshine in Marion, Iowa, is January, with an average of 4h of sunshine.

When is Daylight Saving Time (DST) in Marion?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from CDT to CST.

What is the rainiest month in Marion?

May is the month with the most rainfall in Marion. Rain falls for 19 days and accumulates 5" (127mm) of precipitation.

When it does not snow in Marion?

May through September are months without snowfall in Marion.

When are the longest days in Marion?

The month with the longest days in Marion, Iowa, is June, with an average of 15h and 12min of daylight.

What is the warmest month in Marion?

July is the warmest month, with the temperature often reaching an average high of 80.2°F (26.8°C) and an average low of 64.4°F (18°C).

What is the month with the most sunshine in Marion?

July and August, with an average of 9.8h of sunshine, are months with the most sunshine in Marion, Iowa.

When is the highest UV index in Marion?

The month with the highest UV index is July, with an average maximum UV index of 6.

What is the least humid month in Marion?

The least humid month in Marion is October, with an average relative humidity of 73%.

What is the month with the shortest days in Marion?

The month with the shortest days in Marion, Iowa, is December, with an average of 9h and 12min of daylight.

When is the lowest UV index in Marion?

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

Average temperature
Marion, IA

Average temperature - Marion, IA

The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is January (26.2°F).

The month with the highest average low temperature is July (64.4°F).
The coldest month (with the lowest average low temperature) is January (14.2°F).


Average pressure
Marion, IA

Average pressure - Marion, IA

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).


Average wind speed
Marion, IA

Average wind speed - Marion, IA

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


Average rainfall
Marion, IA

Average rainfall - Marion, IA

The wettest month (with the highest rainfall) is May (5").
The driest month (with the least rainfall) is January (1.34").


Average rainfall days
Marion, IA

Average rainfall days - Marion, IA

The month with the highest number of rainy days is May (19 days).
The months with the least rainy days are January and February (5.2 days).


Average snowfall
Marion, IA

Average snowfall - Marion, IA

The month with the highest snowfall is January (5.79").
The months with the least snowfall are May, June, July, August and September (0").


Average snowfall days
Marion, IA

Average snowfall days - Marion, IA

The month with the highest number of snowfall days is January (12.7 days).
The months with the least snowfall days are June, July, August and September (0 days).


Average daylight / Average sunshine
Marion, IA

Average daylight / Average sunshine - Marion, IA

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).

The months with the most sunshine are July and August (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).


Average sunshine days
Marion, IA

Average sunshine days - Marion, IA

The month with the most sunshine days is November (17 days).
The month with the least sunshine days is June (8.1 days).


Average visibility
Marion, IA

Average visibility - Marion, IA

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


Marion, Iowa, USA

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