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
As August makes way for September, Saint Johns's average high-temperature eases from a moderately hot 77.9°F (25.5°C) to an agreeable 71.6°F (22°C). Throughout the month of September, Saint Johns expects an average low of 52.5°F (11.4°C).Humidity
In Saint Johns, the average relative humidity in September is 79%.Rainfall
In September, the rain falls for 12 days. Throughout September, 1.34" (34mm) of precipitation is accumulated. In Saint Johns, during the entire year, the rain falls for 137.2 days and collects up to 20.83" (529mm) of precipitation.Snowfall
In Saint Johns, snow does not fall in May through September.Daylight
The average length of the day in September is 12h and 29min.On the first day of September, sunrise is at 7:03 am and sunset at 8:12 pm. On the last day of the month, sunrise is at 7:35 am and sunset at 7:20 pm EDT.
Sunshine
The average sunshine in September in Saint Johns, Michigan, is 7.6h.UV index
The average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: In September, the average maximum UV index of 3 translates into the following recommendations:
Exercise caution. The susceptibility of light skin individuals to burns is less than 30 minutes. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.
Frequently asked questions
What is the usual temperature for Saint Johns in September?
What is the average humidity in September in Saint Johns?
How much does it rain in Saint Johns in September?
When it does not snow in Saint Johns?
Does it snow in Saint Johns in September?
How many hours of daylight does Saint Johns have in September?
What time are sunrise and sunset in September in Saint Johns?
How many hours of sunshine does Saint Johns have in September?
How high is the UV index in September in Saint Johns?
Average temperature in September
Saint Johns, MI
- Average high temperature in September: 71.6°F
The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (27°F).
- Average low temperature in September: 52.5°F
The month with the highest average low temperature is July (60.8°F).
The coldest month (with the lowest average low temperature) is January (16.2°F).
Average pressure in September
Saint Johns, MI
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is March (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Saint Johns, MI
- Average wind speed in September: 7.3mph
The windiest month (with the highest average wind speed) is February (10mph).
The calmest month (with the lowest average wind speed) is July (6.6mph).
Average humidity in September
Saint Johns, MI
- Average humidity in September: 79%
The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is April (76%).
Average rainfall in September
Saint Johns, MI
- Average rainfall in September: 1.34"
The wettest month (with the highest rainfall) is May (2.6").
The driest month (with the least rainfall) is November (1.1").
Average rainfall days in September
Saint Johns, MI
- Average rainfall days in September: 12 days
The month with the highest number of rainy days is May (16 days).
The month with the least rainy days is February (5 days).
Average snowfall in September
Saint Johns, MI
- Average snowfall in September: 0"
The month with the highest snowfall is February (4.29").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Saint Johns, MI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (17.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Saint Johns, MI
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in September: 7h and 4min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 2h and 36min).
Average sunshine days in September
Saint Johns, MI
- Average sunshine days in September: 16.4 days
The month with the most sunshine days is September (16.4 days).
The month with the least sunshine days is February (9.2 days).
Average UV index in September
Saint Johns, MI
- Average UV index in September: 3
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Saint Johns, MI
- Average cloud cover in September: 38
The month with the most cloud cover is January (Cloud cover 72).
The month with the least cloud cover is July (Cloud cover 32).
Average visibility in September
Saint Johns, MI
- Average visibility in September: 5mi
The months with the highest visibility are March, April, May, June, July, October and November (6mi).
The months with the lowest visibility are January, February, August, September and December (5mi).
Saint Johns, Michigan, USA
Weather forecast for your location
2. Allow the app to use your location
