September weather forecastMerrill, WI
September
Weather in September
September, the first month of the autumn in Merrill, is still a comfortable month, with temperature in the range of an average high of 67.5°F (19.7°C) and an average low of 48.9°F (9.4°C).Temperature
The arrival of September corresponds with a minor reduction in the average high-temperature, down from August's warm 75.6°F (24.2°C) to a comfortable 67.5°F (19.7°C). An average minimum temperature of 48.9°F (9.4°C) is recorded during the month of September.Humidity
In Merrill, the average relative humidity in September is 80%.Rainfall
In Merrill, in September, during 11.7 rainfall days, 1.22" (31mm) of precipitation is typically accumulated. In Merrill, during the entire year, the rain falls for 126.6 days and collects up to 17.36" (441mm) of precipitation.Snowfall
In Merrill, snow does not fall in June through September.Daylight
In Merrill, the average length of the day in September 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
In September, the average sunshine is 8h.UV index
In September, the average daily maximum UV index is 3. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for ordinary individuals.Note: In September, the maximum UV index of 3 transforms into these recommendations:
Undertake precautions - Guarding against sun damage is counselled. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. Always opt for UVA and UVB-resistant sunglasses on radiant days.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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 30min
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).
