Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
September welcomes an average high-temperature of a still moderately hot 76.5°F (24.7°C), not much different from the preceding month. Throughout the nights in September, San Jose experiences an average low-temperature of 57.9°F (14.4°C).Humidity
In San Jose, the average relative humidity in September is 76%.Rainfall
In San Jose, in September, it is raining for 10.3 days, with typically 1.57" (40mm) of accumulated precipitation. In San Jose, during the entire year, the rain falls for 131.4 days and collects up to 20.08" (510mm) of precipitation.Snowfall
May through October are months without snowfall.Daylight
The average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 6:26 am and sunset at 7:29 pm. On the last day of September, sunrise is at 6:54 am and sunset at 6:41 pm CDT.
Sunshine
The average sunshine in September in San Jose, Illinois, is 9.1h.UV index
In San Jose, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the average person.Note: A maximum high daily UV index of 5 during September translates into the following directions:
Undertake protective steps - Recommendations to avoid sunburn are issued. Around midday, solar radiation is most harmful; hence, exposure should be limited. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.
Frequently asked questions
What are the temperatures in San Jose in September?
What is the average humidity in September in San Jose?
How many days does it rain in September in San Jose?
When it does not snow in San Jose?
What is the average length of the day in September in San Jose?
When is the sunrise / sunset in September in San Jose?
How many hours of sunshine does San Jose have in September?
What is the UV index reading in September in San Jose?
Average temperature in September
San Jose, IL
- Average high temperature in September: 76.5°F
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).
- Average low temperature in September: 57.9°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).
Average pressure in September
San Jose, IL
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
San Jose, IL
- Average wind speed in September: 7.5mph
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).
Average humidity in September
San Jose, IL
- Average humidity in September: 76%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
San Jose, IL
- Average rainfall in September: 1.57"
The wettest month (with the highest rainfall) is May (2.83").
The driest month (with the least rainfall) is February (1.02").
Average rainfall days in September
San Jose, IL
- Average rainfall days in September: 10.3 days
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).
Average snowfall in September
San Jose, IL
- Average snowfall in September: 0"
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").
Average snowfall days in September
San Jose, IL
- Average snowfall days in September: 0 days
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).
Average daylight in September /
Average sunshine in September
San Jose, IL
- Average daylight in September: 12h and 2min
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 September: 9h and 1min
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 in September
San Jose, IL
- Average sunshine days in September: 18.8 days
The month with the most sunshine days is November (20 days).
The month with the least sunshine days is May (11.8 days).
Average UV index in September
San Jose, IL
- Average UV index in September: 5
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 in September
San Jose, IL
- Average cloud cover in September: 30
The month with the most cloud cover is January (Cloud cover 57).
The month with the least cloud cover is September (Cloud cover 30).
Average visibility in September
San Jose, IL
- Average visibility in September: 6mi
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).
San Jose, Illinois, USA
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