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
September reveals a small adjustment in temperature, transitioning from an average high of a moderately hot 77.5°F (25.3°C) in August to a pleasant 70.9°F (21.6°C). Merrimac records a steady low-temperature average of 51.4°F (10.8°C) during September.Humidity
In September, the average relative humidity is 80%.Rainfall
In September, in Merrimac, the rain falls for 8.2 days. Throughout September, 0.75" (19mm) of precipitation is accumulated. Throughout the year, in Merrimac, there are 88.4 rainfall days, and 7.4" (188mm) of precipitation is accumulated.Snowfall
May through September are months without snowfall.Daylight
The average length of the day in September is 12h and 29min.On the first day of the month, sunrise is at 6:23 am and sunset at 7:33 pm. On the last day of September, sunrise is at 6:55 am and sunset at 6:40 pm CDT.
Sunshine
The average sunshine in September in Merrimac is 8.7h.UV index
In September, the average daily maximum UV index is 3. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for average individuals.Note: A maximum high UV index of 3 in September translates into the following recommendations:
Adopt protective measures - Suggestions to resist sunburn are offered. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Merrimac in September?
What is the average humidity in September in Merrimac?
How many days does it rain in September in Merrimac?
When it does not snow in Merrimac?
Does it snow in Merrimac in September?
How many hours of daylight does Merrimac have in September?
When is the sunrise / sunset in September in Merrimac?
How many hours of sunshine does Merrimac have in September?
What is the UV index intensity in September in Merrimac?
Average temperature in September
Merrimac, WI
- Average high temperature in September: 70.9°F
The warmest month (with the highest average high temperature) is July (79°F).
The month with the lowest average high temperature is January (22.5°F).
- Average low temperature in September: 51.4°F
The month with the highest average low temperature is July (61.3°F).
The coldest month (with the lowest average low temperature) is January (10°F).
Average pressure in September
Merrimac, WI
- Average pressure in September: 30.03"Hg
The months with the highest atmospheric pressure are January and February (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Merrimac, WI
- Average wind speed in September: 7.5mph
The windiest month (with the highest average wind speed) is April (9.8mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).
Average humidity in September
Merrimac, WI
- Average humidity in September: 80%
The months with the highest relative humidity are January and February (89%).
The months with the lowest relative humidity are April and October (77%).
Average rainfall in September
Merrimac, WI
- Average rainfall in September: 0.75"
The wettest month (with the highest rainfall) is July (0.98").
The driest month (with the least rainfall) is January (0.28").
Average rainfall days in September
Merrimac, WI
- Average rainfall days in September: 8.2 days
The month with the highest number of rainy days is May (11.8 days).
The month with the least rainy days is February (2.2 days).
Average snowfall in September
Merrimac, WI
- Average snowfall in September: 0"
The month with the highest snowfall is January (1.38").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Merrimac, WI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (9.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Merrimac, WI
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in September: 8h and 4min
The month with the most sunshine is July (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 12min).
Average sunshine days in September
Merrimac, WI
- Average sunshine days in September: 19.9 days
The month with the most sunshine days is January (23.2 days).
The month with the least sunshine days is June (13.8 days).
Average UV index in September
Merrimac, WI
- Average UV index in September: 3
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, November and December (UV index 1).
Average cloud cover in September
Merrimac, WI
- Average cloud cover in September: 35
The month with the most cloud cover is January (Cloud cover 66).
The month with the least cloud cover is August (Cloud cover 33).
Average visibility in September
Merrimac, WI
- Average visibility in September: 5mi
The months with the highest visibility are March, April, May, June, October, November and December (6mi).
The months with the lowest visibility are January, February, July, August and September (5mi).
Merrimac, Wisconsin, USA
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