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
Martinsville experiences an average high-temperature of a still moderately hot 77.4°F (25.2°C) with the onset of September, subtly varied from August's 81.7°F (27.6°C). Martinsville observes an average nighttime temperature of 59.2°F (15.1°C) during September.Humidity
In September, the average relative humidity in Martinsville, Illinois, is 76%.Rainfall
In September, the rain falls for 9.5 days. Throughout September, 0.55" (14mm) of precipitation is accumulated. Throughout the year, in Martinsville, there are 115.9 rainfall days, and 11.26" (286mm) of precipitation is accumulated.Snowfall
In Martinsville, snow does not fall in May through October.Daylight
In September, the average length of the day is 12h and 26min.On the first day of September, sunrise is at 6:20 am and sunset at 7:21 pm. On the last day of the month, sunrise is at 6:47 am and sunset at 6:35 pm CDT.
Sunshine
In Martinsville, the average sunshine in September is 9h.UV index
In September, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for the ordinary person.Note: The UV index of 5 during September leads to these advisories:
Preventative actions are necessary - The mandate to avoid skin and eye damage is in place. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Martinsville in September?
What is the average humidity in September in Martinsville?
How many days does it rain in September in Martinsville?
When it does not snow in Martinsville?
What is the average length of the day in September in Martinsville?
What time are sunrise and sunset in September in Martinsville?
How many hours of sunshine does Martinsville have in September?
How high is the UV index in September in Martinsville?
Average temperature in September
Martinsville, IL
- Average high temperature in September: 77.4°F
The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is January (34.7°F).
- Average low temperature in September: 59.2°F
The month with the highest average low temperature is July (66.4°F).
The coldest month (with the lowest average low temperature) is January (22.6°F).
Average pressure in September
Martinsville, IL
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Martinsville, IL
- Average wind speed in September: 6.9mph
The windiest months (with the highest average wind speed) are January and February (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.1mph).
Average humidity in September
Martinsville, IL
- Average humidity in September: 76%
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Martinsville, IL
- Average rainfall in September: 0.55"
The wettest month (with the highest rainfall) is April (1.54").
The driest month (with the least rainfall) is February (0.47").
Average rainfall days in September
Martinsville, IL
- Average rainfall days in September: 9.5 days
The month with the highest number of rainy days is May (14.9 days).
The month with the least rainy days is February (6 days).
Average snowfall in September
Martinsville, IL
- Average snowfall in September: 0"
The month with the highest snowfall is December (0.47").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Martinsville, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (5.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Martinsville, IL
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 9h and 0min
The month with the most sunshine is June (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in September
Martinsville, IL
- Average sunshine days in September: 18.2 days
The month with the most sunshine days is October (21.2 days).
The month with the least sunshine days is May (12.4 days).
Average UV index in September
Martinsville, IL
- Average UV index in September: 5
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Martinsville, IL
- Average cloud cover in September: 31
The month with the most cloud cover is January (Cloud cover 55).
The month with the least cloud cover is June (Cloud cover 30).
Average visibility in September
Martinsville, IL
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, September, October, November and December (6mi).
The month with the lowest visibility is August (5mi).
Martinsville, Illinois, USA
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