Climate and monthly weather forecast
San Jose, IL

Weather in January

January, the same as December, in San Jose, Illinois, is a freezing cold winter month, with temperature in the range of an average high of 31.5°F (-0.3°C) and an average low of 19.8°F (-6.8°C). With an average high-temperature of 31.5°F (-0.3°C) and an average low-temperature of 19.8°F (-6.8°C), January is the coldest month. Weather in January »

Weather in February

The last month of the winter, February, is a cold month in San Jose, Illinois, with an average temperature fluctuating between 36.3°F (2.4°C) and 23.4°F (-4.8°C). In San Jose, the average high-temperature in February is almost the same as in January - a cold 36.3°F (2.4°C). Weather in February »

Weather in March

The first month of the spring, March, is a frosty month in San Jose, Illinois, with an average temperature varying between 49.6°F (9.8°C) and 34.5°F (1.4°C). In San Jose, the average high-temperature in March rises from a cold 36.3°F (2.4°C) in February to a frosty 49.6°F (9.8°C). Weather in March »

Weather in April

April is a comfortable spring month in San Jose, Illinois, with temperature in the range of an average low of 44.6°F (7°C) and an average high of 61.5°F (16.4°C). In April, the average high-temperature rises from a frosty 49.6°F (9.8°C) in March to a comfortable 61.5°F (16.4°C). Weather in April »

Weather in May

The last month of the spring, May, is a pleasant month in San Jose, Illinois, with an average temperature fluctuating between 55.8°F (13.2°C) and 72.1°F (22.3°C). In San Jose, the average high-temperature in May rises from an enjoyable 61.5°F (16.4°C) in April to a pleasant 72.1°F (22.3°C). Weather in May »

Weather in June

June, the first month of the summer in San Jose, is a moderately hot month, with an average temperature ranging between max 80.6°F (27°C) and min 63.9°F (17.7°C). In June, the average high-temperature slightly increases from an agreeable 72.1°F (22.3°C) in May to a warm 80.6°F (27°C). Weather in June »

Weather in July

July, like June, in San Jose, Illinois, is a moderately hot summer month, with an average temperature varying between 65.3°F (18.5°C) and 82°F (27.8°C). With an average high-temperature of 82°F (27.8°C) and an average low-temperature of 65.3°F (18.5°C), July is the warmest month. The average heat index in July is estimated at a tropical 89.6°F (32°C). Weather in July »

Weather in August

The last month of the summer, August, is also a moderately hot month in San Jose, Illinois, with an average temperature fluctuating between 81.1°F (27.3°C) and 63.5°F (17.5°C). In San Jose, the average high-temperature in August is almost the same as in July - a still moderately hot 81.1°F (27.3°C). Weather in August »

Weather in September

The first month of the autumn, September, is also a moderately hot month in San Jose, Illinois, with an average temperature ranging between min 57.9°F (14.4°C) and max 76.5°F (24.7°C). In San Jose, the average high-temperature in September is practically the same as in August - a still warm 76.5°F (24.7°C). Weather in September »

Weather in October

October, the same as September, is another comfortable autumn month in San Jose, Illinois, with temperature in the range of an average low of 46.9°F (8.3°C) and an average high of 63.1°F (17.3°C). In San Jose, Illinois, the average high-temperature in October drops from a moderately hot 76.5°F (24.7°C) in September to a comfortable 63.1°F (17.3°C). Weather in October »

Weather in November

The last month of the autumn, November, is another chilly month in San Jose, Illinois, with an average temperature fluctuating between 35.2°F (1.8°C) and 48.9°F (9.4°C). In San Jose, the average high-temperature in November decreases from a comfortable 63.1°F (17.3°C) in October to a chilly 48.9°F (9.4°C). Weather in November »

Weather in December

December, the first month of the winter in San Jose, is still a cold month, with an average temperature fluctuating between 36.9°F (2.7°C) and 26.4°F (-3.1°C). In December, the average high-temperature decreases from a frosty 48.9°F (9.4°C) in November to a cold 36.9°F (2.7°C). Weather in December »
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FAQ

What is the coldest month in San Jose?

With an average high-temperature of 31.5°F (-0.3°C) and an average low-temperature of 19.8°F (-6.8°C), January is the coldest month in San Jose.

How much does it rain in San Jose?

In San Jose, Illinois, during the entire year, the rain falls for 131.4 days and collects up to 20.08" (510mm) of precipitation.

When does it snow in San Jose?

January through April, November and December are months with snowfall in San Jose, Illinois.

What is the snowiest month in San Jose?

January is the month with the most snowfall in San Jose. Snow falls for 8.4 days and accumulates 2.87" (73mm) of snow.

How many days does it snow in San Jose?

In San Jose, during the entire year, snow falls for 25.8 days and aggregates up to 8.66" (220mm) of snow.

What is the month with the least sunshine in San Jose?

January has the least sunshine of the year, with an average of 4h of sunshine.

What is the month with the lowest UV index in San Jose?

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

What is the driest month in San Jose?

February is the month with the least rainfall in San Jose. Rain falls for 5.1 days and accumulates 1.02" (26mm) of precipitation.

When is Daylight Saving Time (DST) in San Jose?

On Sunday, March 13. 2022, at 2:00 am, Daylight Saving Time starts in San Jose, 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 rainiest month in San Jose?

May is the month with the most rainfall in San Jose. Rain falls for 17.7 days and accumulates 2.83" (72mm) of precipitation.

When it does not snow in San Jose?

In San Jose, snow does not fall in May through October.

When are the longest days in San Jose?

June has the longest days of the year in San Jose, Illinois, with an average of 15h and 0min of daylight.

What month has the most sunshine in San Jose?

June has the most sunshine of the year in San Jose, with an average of 10.2h of sunshine.

What are the months with the highest UV index in San Jose?

The months with the highest UV index in San Jose, Illinois, are June through August, with an average maximum UV index of 6.

What is the warmest month in San Jose?

The warmest month is July, with an average high-temperature of 82°F (27.8°C) and an average low-temperature of 65.3°F (18.5°C).

What is the most humid month in San Jose?

The most humid month is July, with an average relative humidity of 84%.

What is the least humid month in San Jose?

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

What is the month with the shortest days in San Jose?

December has the shortest days of the year in San Jose, with an average of 9h and 22min of daylight.

Average temperature
San Jose, IL

Average temperature - San Jose, IL

The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (31.5°F).

The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).

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Average pressure
San Jose, IL

Average pressure - San Jose, IL

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed
San Jose, IL

Average wind speed - San Jose, IL

The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).

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Average rainfall
San Jose, IL

Average rainfall - San Jose, IL

The wettest month (with the highest rainfall) is May (2.83").
The driest month (with the least rainfall) is February (1.02").

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Average rainfall days
San Jose, IL

Average rainfall days - San Jose, IL

The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is February (5.1 days).

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Average snowfall
San Jose, IL

Average snowfall - San Jose, IL

The month with the highest snowfall is January (2.87").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days
San Jose, IL

Average snowfall days - San Jose, IL

The month with the highest number of snowfall days is January (8.4 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average daylight / Average sunshine
San Jose, IL

Average daylight / Average sunshine - San Jose, IL

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 22min).

The month with the most sunshine is June (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).

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Average sunshine days
San Jose, IL

Average sunshine days - San Jose, IL

The month with the most sunshine days is November (20 days).
The month with the least sunshine days is May (11.8 days).

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Average UV index
San Jose, IL

Average UV index - San Jose, IL

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average visibility
San Jose, IL

Average visibility - San Jose, IL

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

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