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
With September's onset, the weather reveals a slight temperature decrease, transitioning from a warm 76.5°F (24.7°C) in August to a pleasant 68.9°F (20.5°C). Johannesburg records an average nighttime low-temperature of 49.8°F (9.9°C) throughout September.Humidity
In September, the average relative humidity is 79%.Rainfall
The month with the least rainfall is September, when the rain falls for 12.3 days and typically collects 1.3" (33mm) of precipitation.Snowfall
In Johannesburg, snow does not fall in June through September.Daylight
In Johannesburg, the average length of the day in September is 12h and 31min.On the first day of the month, sunrise is at 7:00 am and sunset at 8:14 pm. On the last day of September, sunrise is at 7:35 am and sunset at 7:19 pm EDT.
Sunshine
The average sunshine in September is 7.7h.UV index
In Johannesburg, the average daily maximum UV index in September is 3. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for the average person.Note: The UV index of 3 in September translates into these instructions:
Put precautions into practice - Guidance to elude sunburn is provided. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in September?
What is the average humidity in September?
What is the driest month in Johannesburg?
How many days does it rain in September?
When it does not snow?
Does it snow in September?
How many hours of daylight does Johannesburg have in September?
When is the sunrise / sunset in September?
How many hours of sunshine does Johannesburg have in September?
What is the UV index intensity in September?
Average temperature in September
Johannesburg, MI
- Average high temperature in September: 68.9°F
The warmest month (with the highest average high temperature) is July (78.1°F).
The month with the lowest average high temperature is January (23.5°F).
- Average low temperature in September: 49.8°F
The month with the highest average low temperature is July (57°F).
The coldest month (with the lowest average low temperature) is February (14.4°F).
Average pressure in September
Johannesburg, MI
- Average pressure in September: 30.02"Hg
The month with the highest atmospheric pressure is March (30.08"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Johannesburg, MI
- Average wind speed in September: 6.4mph
The windiest month (with the highest average wind speed) is April (8.2mph).
The calmest months (with the lowest average wind speed) are July and August (6.2mph).
Average humidity in September
Johannesburg, MI
- Average humidity in September: 79%
The months with the highest relative humidity are January and February (90%).
The month with the lowest relative humidity is May (70%).
Average rainfall in September
Johannesburg, MI
- Average rainfall in September: 1.3"
The wettest month (with the highest rainfall) is May (2.76").
The driest month (with the least rainfall) is September (1.3").
Average rainfall days in September
Johannesburg, MI
- Average rainfall days in September: 12.3 days
The month with the highest number of rainy days is October (17.5 days).
The months with the least rainy days are January and February (5 days).
Average snowfall in September
Johannesburg, MI
- Average snowfall in September: 0"
The month with the highest snowfall is January (10.94").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Johannesburg, MI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (24.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Johannesburg, MI
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in September: 7h and 4min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 1h and 42min).
Average sunshine days in September
Johannesburg, MI
- Average sunshine days in September: 14.6 days
The month with the most sunshine days is September (14.6 days).
The month with the least sunshine days is February (5.4 days).
Average UV index in September
Johannesburg, MI
- Average UV index in September: 3
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February and December (UV index 1).
Average cloud cover in September
Johannesburg, MI
- Average cloud cover in September: 41
The month with the most cloud cover is January (Cloud cover 83).
The month with the least cloud cover is July (Cloud cover 34).
Average visibility in September
Johannesburg, MI
- Average visibility in September: 5mi
The months with the highest visibility are May and June (6mi).
The months with the lowest visibility are January, February, March and December (4mi).
Johannesburg, Michigan, USA
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