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
The average high-temperature shows a slight dip in September, from August's moderately hot 75.6°F (24.2°C) to an enjoyable 67.5°F (19.7°C). Throughout September nights, Merrill experiences a consistent temperature average of 48.9°F (9.4°C).Humidity
In September, the average relative humidity in Merrill is 80%.Rainfall
In September, in Merrill, the rain falls for 11.7 days. Throughout September, 1.22" (31mm) of precipitation is accumulated. Throughout the year, in Merrill, there are 126.6 rainfall days, and 17.36" (441mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall in Merrill.Daylight
In September, the average length of the day is 12h and 31min.On the first day of September, sunrise is at 6:21 am and sunset at 7:35 pm. On the last day of the month, sunrise is at 6:56 am and sunset at 6:40 pm CDT.
Sunshine
The average sunshine in September in Merrill is 8h.UV index
The average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for average individuals.Note: The maximum UV index of 3 during September leads to these instructions:
Adopt protective measures - It is advised to guard against sun damage. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.
Frequently asked questions
What are September temperatures in Merrill?
What is the average humidity in September in Merrill?
How much does it rain in Merrill in September?
When it does not snow in Merrill?
Does it snow in Merrill in September?
How many hours of daylight does Merrill have in September?
When is the sunrise / sunset in September in Merrill?
How long on average sun shines in September in Merrill?
What is the UV index intensity in September in Merrill?
Average temperature in September
Merrill, WI
- Average high temperature in September: 67.5°F
The warmest month (with the highest average high temperature) is July (77.5°F).
The month with the lowest average high temperature is January (19.2°F).
- Average low temperature in September: 48.9°F
The month with the highest average low temperature is July (57.9°F).
The coldest month (with the lowest average low temperature) is January (7.9°F).
Average pressure in September
Merrill, WI
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is February (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Merrill, WI
- Average wind speed in September: 7.5mph
The windiest month (with the highest average wind speed) is April (9mph).
The calmest month (with the lowest average wind speed) is August (6.8mph).
Average humidity in September
Merrill, WI
- Average humidity in September: 80%
The months with the highest relative humidity are January and February (92%).
The month with the lowest relative humidity is May (75%).
Average rainfall in September
Merrill, WI
- Average rainfall in September: 1.22"
The wettest month (with the highest rainfall) is May (2.28").
The driest months (with the least rainfall) are January and February (0.79").
Average rainfall days in September
Merrill, WI
- Average rainfall days in September: 11.7 days
The months with the highest number of rainy days are May and June (15.8 days).
The month with the least rainy days is January (3.9 days).
Average snowfall in September
Merrill, WI
- Average snowfall in September: 0"
The month with the highest snowfall is January (4.76").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Merrill, WI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (20.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Merrill, WI
- 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: 8h and 0min
The month with the most sunshine is July (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 2h and 36min).
Average sunshine days in September
Merrill, WI
- Average sunshine days in September: 15.7 days
The month with the most sunshine days is September (15.7 days).
The month with the least sunshine days is April (10.3 days).
Average UV index in September
Merrill, WI
- 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
Merrill, WI
- Average cloud cover in September: 41
The month with the most cloud cover is January (Cloud cover 75).
The months with the least cloud cover are July and August (Cloud cover 37).
Average visibility in September
Merrill, WI
- Average visibility in September: 5mi
The months with the highest visibility are April, May, June and October (6mi).
The months with the lowest visibility are January and February (4mi).
Merrill, Wisconsin, USA
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