Climate and monthly weather forecastSaint Joseph, IL
Climate and monthly weather forecast
Weather in January
January, like December, is another subzero cold winter month in Saint Joseph, Illinois, with an average temperature ranging between max 31.8°F (-0.1°C) and min 20.5°F (-6.4°C). Saint Joseph's coldest temperatures are experienced in January, with average high temperatures of 31.8°F (-0.1°C) and lows of 20.5°F (-6.4°C). Weather in January »Weather in February
February, the last month of the winter in Saint Joseph, is a cold month, with an average temperature fluctuating between 37°F (2.8°C) and 24.3°F (-4.3°C). The transition into February shows a subtle variation to an icy 37°F (2.8°C) from January's 31.8°F (-0.1°C) in the average high-temperature. Weather in February »Weather in March
March, the first month of the spring in Saint Joseph, is a frosty month, with an average temperature fluctuating between 34.7°F (1.5°C) and 49.5°F (9.7°C). As Saint Joseph enters March, the average high-temperature increases from the a cold 37°F (2.8°C) of February to a frosty 49.5°F (9.7°C). Weather in March »Weather in April
April is a comfortable spring month in Saint Joseph, Illinois, with an average temperature fluctuating between 61.3°F (16.3°C) and 45.7°F (7.6°C). The onset of April brings a rise in the average high-temperature, elevating from a chilly 49.5°F (9.7°C) in March to an enjoyable 61.3°F (16.3°C). Weather in April »Weather in May
The last month of the spring, May, is a pleasant month in Saint Joseph, Illinois, with an average temperature varying between 56.1°F (13.4°C) and 72.1°F (22.3°C). Noticing a change, the average high-temperature during May moves from April's comfortable 61.3°F (16.3°C) to a pleasant 72.1°F (22.3°C). Weather in May »Weather in June
June, the first month of the summer in Saint Joseph, is a moderately hot month, with an average temperature varying between 63.9°F (17.7°C) and 80.1°F (26.7°C). The arrival of June introduces a minor uplift in high-temperatures, adjusting from a pleasant 72.1°F (22.3°C) in May to a warm 80.1°F (26.7°C). Weather in June »Weather in July
July, like June, in Saint Joseph, Illinois, is a moderately hot summer month, with temperature in the range of an average high of 81.1°F (27.3°C) and an average low of 65.1°F (18.4°C). Saint Joseph's July weather, marked by an average high temperature of 81.1°F (27.3°C) and an average low temperature of 65.1°F (18.4°C), is the warmest in the year. During July, the heat index is estimated at a hot 87.8°F (31°C). Weather in July »Weather in August
The last month of the summer, August, is also a moderately hot month in Saint Joseph, Illinois, with an average temperature fluctuating between 80.6°F (27°C) and 63.3°F (17.4°C). The arrival of August is marked by an average high-temperature of a still moderately hot 80.6°F (27°C), bearing a close resemblance to July. Weather in August »Weather in September
September, the first month of the autumn in Saint Joseph, is also a moderately hot month, with an average temperature ranging between max 76.1°F (24.5°C) and min 58.3°F (14.6°C). The advent of September sees the average high-temperature at a still warm 76.1°F (24.5°C), subtly shifted from August's 80.6°F (27°C). Weather in September »Weather in October
October, like September, in Saint Joseph, Illinois, is another comfortable autumn month, with an average temperature ranging between max 63.5°F (17.5°C) and min 47.8°F (8.8°C). The shift to October brings a decrease in the average high-temperature, falling from a moderately hot 76.1°F (24.5°C) in September to an enjoyable 63.5°F (17.5°C). Weather in October »Weather in November
November, the last month of the autumn in Saint Joseph, is also a frosty month, with an average temperature varying between 49.1°F (9.5°C) and 36°F (2.2°C). As Saint Joseph transitions into November, the average high-temperature shows a marked reduction, decreasing from a refreshing 63.5°F (17.5°C) in October to a frosty 49.1°F (9.5°C). Weather in November »Weather in December
December, the first month of the winter in Saint Joseph, is also a wintry month, with an average temperature ranging between max 37.6°F (3.1°C) and min 27.7°F (-2.4°C). The onset of December brings a small change in high-temperatures, falling from a frosty 49.1°F (9.5°C) in November to a wintry 37.6°F (3.1°C). Weather in December »Updated: Feb 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
January is Saint Joseph's coldest month, registering average high temperatures of 31.8°F (-0.1°C) and lows of 20.5°F (-6.4°C).
In Saint Joseph, during the entire year, the rain falls for 129.9 days and collects up to 18.15" (461mm) of precipitation.
January through April, November and December are months with snowfall in Saint Joseph.
The month with the most snowfall in Saint Joseph, Illinois, is January, when snow falls for 8.7 days and typically aggregates up to 1.85" (47mm) of snow.
In Saint Joseph, during the entire year, snow falls for 27.1 days and aggregates up to 5.91" (150mm) of snow.
With an average of 4h of sunshine, January has the least sunshine of the year.
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Saint Joseph, Illinois, 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.
The month with the most rainfall is April, when the rain falls for 13.8 days and typically aggregates up to 2.24" (57mm) of precipitation.
May through October are months without snowfall.
June has the longest days of the year, with an average of 15h and 0min of daylight.
June has the most sunshine of the year in Saint Joseph, Illinois, with an average of 10.2h of sunshine.
June through August, with an average maximum UV index of 6, are months with the highest UV index in Saint Joseph, Illinois.
Saint Joseph's July weather, marked by an average high temperature of 81.1°F (27.3°C) and an average low temperature of 65.1°F (18.4°C), is the warmest in the year.
With an average relative humidity of 85%, July is the most humid month in Saint Joseph.
September is the month with the least rainfall. Rain falls for 10.4 days and accumulates 0.94" (24mm) of precipitation.
October is the least humid month in Saint Joseph, Illinois, with an average relative humidity of 70%.
With an average of 9h and 24min of daylight, December has the shortest days of the year in Saint Joseph, Illinois.
Average temperature
Saint Joseph, IL
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (31.8°F).
The month with the highest average low temperature is July (65.1°F).
The coldest month (with the lowest average low temperature) is January (20.5°F).
Average pressure
Saint Joseph, IL
- Average pressure in January:
30.14"Hg - Average pressure in February:
30.11"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.94"Hg - Average pressure in May:
29.96"Hg - Average pressure in June:
29.92"Hg
- Average pressure in July:
29.97"Hg - Average pressure in August:
29.98"Hg - Average pressure in September:
30.03"Hg - Average pressure in October:
30.02"Hg - Average pressure in November:
30.12"Hg - Average pressure in December:
30.12"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed
Saint Joseph, IL
- Average wind speed in January:
10.8mph - Average wind speed in February:
10.7mph - Average wind speed in March:
10.3mph - Average wind speed in April:
10.6mph - Average wind speed in May:
8.9mph - Average wind speed in June:
7.6mph
- Average wind speed in July:
6.4mph - Average wind speed in August:
6.3mph - Average wind speed in September:
7.3mph - Average wind speed in October:
9.5mph - Average wind speed in November:
10.2mph - Average wind speed in December:
10.1mph
The windiest month (with the highest average wind speed) is January (10.8mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).
Average humidity
Saint Joseph, IL
The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (70%).
Average rainfall
Saint Joseph, IL
- Average rainfall in January:
1.26" - Average rainfall in February:
0.98" - Average rainfall in March:
1.65" - Average rainfall in April:
2.24" - Average rainfall in May:
2.2" - Average rainfall in June:
2.01"
- Average rainfall in July:
1.69" - Average rainfall in August:
1.54" - Average rainfall in September:
0.94" - Average rainfall in October:
1.5" - Average rainfall in November:
1.14" - Average rainfall in December:
0.98"
The wettest month (with the highest rainfall) is April (2.24").
The driest month (with the least rainfall) is September (0.94").
Average rainfall days
Saint Joseph, IL
- Average rainfall days in January:
6 days - Average rainfall days in February:
6 days - Average rainfall days in March:
11 days - Average rainfall days in April:
13.8 days - Average rainfall days in May:
15.3 days - Average rainfall days in June:
14.6 days
- Average rainfall days in July:
14.7 days - Average rainfall days in August:
13 days - Average rainfall days in September:
10.4 days - Average rainfall days in October:
10.6 days - Average rainfall days in November:
7.5 days - Average rainfall days in December:
7 days
The month with the highest number of rainy days is May (15.3 days).
The months with the least rainy days are January and February (6 days).
Average snowfall
Saint Joseph, IL
The month with the highest snowfall is January (1.85").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
Saint Joseph, IL
- Average snowfall days in January:
8.7 days - Average snowfall days in February:
7 days - Average snowfall days in March:
2.8 days - Average snowfall days in April:
0.6 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0.1 days - Average snowfall days in November:
2 days - Average snowfall days in December:
5.9 days
The month with the highest number of snowfall days is January (8.7 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Saint Joseph, IL
- Average daylight in January:
9h and 42min - Average daylight in February:
10h and 42min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 18min - Average daylight in May:
14h and 24min - Average daylight in June:
15h and 0min
- Average daylight in July:
14h and 42min - Average daylight in August:
13h and 42min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 6min - Average daylight in November:
10h and 0min - Average daylight in December:
9h and 24min
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 24min).
- Average sunshine in January:
4h and 0min - Average sunshine in February:
4h and 12min - Average sunshine in March:
6h and 18min - Average sunshine in April:
8h and 6min - Average sunshine in May:
9h and 0min - Average sunshine in June:
10h and 12min
- Average sunshine in July:
9h and 54min - Average sunshine in August:
9h and 54min - Average sunshine in September:
8h and 54min - Average sunshine in October:
6h and 12min - Average sunshine in November:
5h and 24min - Average sunshine in December:
4h and 30min
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).
Average sunshine days
Saint Joseph, IL
- Average sunshine days in January:
18.3 days - Average sunshine days in February:
16.3 days - Average sunshine days in March:
16.1 days - Average sunshine days in April:
13.6 days - Average sunshine days in May:
12.6 days - Average sunshine days in June:
12.2 days
- Average sunshine days in July:
11.8 days - Average sunshine days in August:
13.9 days - Average sunshine days in September:
16.5 days - Average sunshine days in October:
18.5 days - Average sunshine days in November:
19.7 days - Average sunshine days in December:
18.5 days
The month with the most sunshine days is November (19.7 days).
The month with the least sunshine days is July (11.8 days).
Average UV index
Saint Joseph, 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).
Average cloud cover
Saint Joseph, IL
The month with the most cloud cover is January (Cloud cover 57).
The months with the least cloud cover are August and September (Cloud cover 31).
Average visibility
Saint Joseph, 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).
