Climate and monthly weather forecast
Eureka, MO

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Weather in January

January, the same as December, is a wintry winter month in Eureka, Missouri, with an average temperature ranging between max 38.5°F (3.6°C) and min 24.6°F (-4.1°C). Eureka's January weather, with an average high temperature of 38.5°F (3.6°C) and an average low temperature of 24.6°F (-4.1°C), tends to be the coldest of the year. Weather in January »

Weather in February

The last month of the winter, February, is a frosty month in Eureka, Missouri, with an average temperature fluctuating between 43°F (6.1°C) and 28°F (-2.2°C). The ushering in of February brings an average high-temperature of a chilly 43°F (6.1°C), closely mirroring the 38.5°F (3.6°C) of January. Weather in February »

Weather in March

March, the first month of the spring in Eureka, is a cool month, with an average temperature varying between 54.9°F (12.7°C) and 38.1°F (3.4°C). The shift into March is marked by a rise in the average high-temperature, moving from February's frosty 43°F (6.1°C) to a fresh 54.9°F (12.7°C). Weather in March »

Weather in April

April is an enjoyable spring month in Eureka, Missouri, with temperature in the range of an average high of 65.8°F (18.8°C) and an average low of 47.8°F (8.8°C). Eureka's weather in April shows a rise in the average high-temperature, moving up from March's fresh 54.9°F (12.7°C) to a refreshing 65.8°F (18.8°C). Weather in April »

Weather in May

The last month of the spring, May, is a warm month in Eureka, Missouri, with an average temperature fluctuating between 75.7°F (24.3°C) and 57.4°F (14.1°C). With the onset of May, Eureka sees a temperature rise, with the average high-temperature moving from April's comfortable 65.8°F (18.8°C) to a moderately hot 75.7°F (24.3°C). Weather in May »

Weather in June

The first month of the summer, June, is also a moderately hot month in Eureka, Missouri, with an average temperature fluctuating between 66.4°F (19.1°C) and 85.3°F (29.6°C). With the onset of June, the average high-temperature slightly shifts from May's moderately hot 75.7°F (24.3°C) to a still warm 85.3°F (29.6°C). Weather in June »

Weather in July

July is a tropical summer month in Eureka, Missouri, with an average temperature varying between 88.2°F (31.2°C) and 69.3°F (20.7°C). In Eureka, Missouri, the month of July registers the highest temperatures, averaging 88.2°F (31.2°C) at the peak and 69.3°F (20.7°C) at the lowest. During July, the heat index is calculated to be a blisteringly hot 104°F (40°C). Weather in July »

Weather in August

August, the last month of the summer in Eureka, is another tropical month, with an average temperature ranging between min 67.3°F (19.6°C) and max 86.5°F (30.3°C). Eureka measures an average high-temperature of a still tropical 86.5°F (30.3°C) in August, nearly consistent with the preceding month. Weather in August »

Weather in September

September, the first month of the autumn in Eureka, is also a moderately hot month, with an average temperature varying between 80.1°F (26.7°C) and 59.9°F (15.5°C). With the arrival of September, Eureka notices a mild change in the average high-temperature, sliding from August's hot 86.5°F (30.3°C) to a warm 80.1°F (26.7°C). Weather in September »

Weather in October

October, like September, in Eureka, Missouri, is another comfortable autumn month, with an average temperature varying between 48.9°F (9.4°C) and 66.6°F (19.2°C). October's arrival comes with a decrease in the average high-temperature, moving from a moderately hot 80.1°F (26.7°C) in September to a refreshing 66.6°F (19.2°C). Weather in October »

Weather in November

The last month of the autumn, November, is another cool month in Eureka, Missouri, with an average temperature varying between 37.9°F (3.3°C) and 53.8°F (12.1°C). November comes with a drop in the average high-temperature, falling from October's refreshing 66.6°F (19.2°C) to a fresh 53.8°F (12.1°C). Weather in November »

Weather in December

December, the first month of the winter in Eureka, is also a frosty month, with an average temperature fluctuating between 43.3°F (6.3°C) and 30.2°F (-1°C). December suggests a modest reduction in the average high-temperature, shifting from a cool 53.8°F (12.1°C) in November to a frosty 43.3°F (6.3°C). Weather in December »

Frequently asked questions

What is the coldest month?

The month of January, characterized by an average high of 38.5°F (3.6°C) and a low of 24.6°F (-4.1°C), is recognized as the coldest.

How much does it rain?

In Eureka, during the entire year, the rain falls for 134.1 days and collects up to 23.82" (605mm) of precipitation.

When does it snow?

January through March, November and December are months with snowfall in Eureka.

How many days does it snow?

In Eureka, during the entire year, snow falls for 19.5 days and aggregates up to 4.29" (109mm) of snow.

What is the month with the least sunshine?

With an average of 4.6h of sunshine, January has the least sunshine of the year.

What are the months with the lowest UV index?

The months with the lowest UV index are January, February and December, with an average maximum UV index of 2.

What is the driest month in Eureka?

The month with the least rainfall is February, when the rain falls for 6.7 days and typically collects 1.1" (28mm) of precipitation.

When is Daylight Saving Time (DST)?

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.

When it does not snow?

April through October are months without snowfall.

What is the most humid month?

May is the most humid month, with an average relative humidity of 78%.

What is the rainiest month?

The month with the most rainfall is May, when the rain falls for 16.3 days and typically aggregates up to 3.03" (77mm) of precipitation.

When are the longest days?

With an average of 14h and 48min of daylight, June has the longest days of the year.

What are the warmest months?

July stands out as Eureka's warmest month, with an average high-temperature of 88.2°F (31.2°C) and a low-temperature of 69.3°F (20.7°C).

What month has the most sunshine?

With an average of 10.4h of sunshine, July has the most sunshine of the year.

What is the month with the highest UV index?

The month with the highest UV index is July, with an average maximum UV index of 7.

What is the least humid month?

October is the least humid month, with an average relative humidity of 71%.

When does it snow the most?

The month with the most snowfall is December, when snow falls for 4.1 days and typically aggregates up to 1.3" (33mm) of snow.

What is the month with the shortest days?

December has the shortest days of the year, with an average of 9h and 30min of daylight.

Average temperature
Eureka, MO

Average temperature - Eureka, MO

The warmest month (with the highest average high temperature) is July (88.2°F).
The month with the lowest average high temperature is January (38.5°F).

The month with the highest average low temperature is July (69.3°F).
The coldest month (with the lowest average low temperature) is January (24.6°F).

Average pressure
Eureka, MO

Average pressure - Eureka, MO

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

Average wind speed
Eureka, MO

Average wind speed - Eureka, MO

The windiest month (with the highest average wind speed) is January (8.8mph).
The calmest months (with the lowest average wind speed) are July and August (5.3mph).

Average rainfall
Eureka, MO

Average rainfall - Eureka, MO

The wettest month (with the highest rainfall) is May (3.03").
The driest month (with the least rainfall) is February (1.1").

Average rainfall days
Eureka, MO

Average rainfall days - Eureka, MO

The month with the highest number of rainy days is May (16.3 days).
The month with the least rainy days is December (6.1 days).

Average snowfall
Eureka, MO

Average snowfall - Eureka, MO

The month with the highest snowfall is December (1.3").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days
Eureka, MO

Average snowfall days - Eureka, MO

The month with the highest number of snowfall days is January (6.4 days).
The months with the least snowfall days are May, June, July and August (0 days).

Average daylight / Average sunshine
Eureka, MO

Average daylight / Average sunshine - Eureka, MO

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).

The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).

Average sunshine days
Eureka, MO

Average sunshine days - Eureka, MO

The month with the most sunshine days is December (20.3 days).
The month with the least sunshine days is May (12.6 days).

Average visibility
Eureka, MO

Average visibility - Eureka, MO

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

Eureka, Missouri, USA

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