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
In September, the average high-temperature marginally decreases from 82.8°F (28.2°C) in August to a still moderately hot 74.1°F (23.4°C). Merrill, amid September nights, sees a noteworthy disparity from daily highs with an average temperature of 44.1°F (6.7°C).Humidity
In September, the average relative humidity is 51%.Rainfall
In Merrill, in September, during 4 rainfall days, 0.39" (10mm) of precipitation is typically accumulated. Throughout the year, there are 97.4 rainfall days, and 12.01" (305mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through June, September through December. September is the first month it typically snows in Merrill. Throughout September, in the average 0.2 snowfall days, it receives 0.08" (2mm) of snow. Throughout the year, there are 64.6 snowfall days, and 38.31" (973mm) of snow is accumulated.Daylight
The average length of the day in September is 12h and 28min.On the first day of September, sunrise is at 6:32 am and sunset at 7:39 pm. On the last day of the month, sunrise is at 7:03 am and sunset at 6:49 pm PDT.
Sunshine
In Merrill, the average sunshine in September is 11.1h.UV index
The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for the average person.Note: In September, the maximum UV index of 4 translates into these guidelines:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense. Be alert! Nearly double the UV rays from the Sun can be reflected by snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Merrill in September?
What is the average humidity in September?
How many days does it rain in September in Merrill?
When does it start snowing?
How many hours of daylight does Merrill have in September?
When are sunrise and sunset in September?
How many hours of sunshine does Merrill have in September?
What is the UV index reading in September?
Average temperature in September
Merrill, OR
- Average high temperature in September: 74.1°F
The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is December (37.2°F).
- Average low temperature in September: 44.1°F
The month with the highest average low temperature is August (49.3°F).
The coldest month (with the lowest average low temperature) is December (25°F).
Average pressure in September
Merrill, OR
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is January (30.18"Hg).
The months with the lowest atmospheric pressure are June, July and August (29.96"Hg).
Average wind speed in September
Merrill, OR
- Average wind speed in September: 5.1mph
The windiest month (with the highest average wind speed) is March (6.5mph).
The calmest month (with the lowest average wind speed) is August (5mph).
Average humidity in September
Merrill, OR
- Average humidity in September: 51%
The month with the highest relative humidity is January (83%).
The month with the lowest relative humidity is August (47%).
Average rainfall in September
Merrill, OR
- Average rainfall in September: 0.39"
The wettest month (with the highest rainfall) is December (1.97").
The driest month (with the least rainfall) is July (0.16").
Average rainfall days in September
Merrill, OR
- Average rainfall days in September: 4 days
The month with the highest number of rainy days is March (12.5 days).
The month with the least rainy days is August (3.1 days).
Average snowfall in September
Merrill, OR
- Average snowfall in September: 0.08"
The month with the highest snowfall is December (9.57").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Merrill, OR
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is December (13.4 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Merrill, OR
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in September: 11h and 1min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 5h and 24min).
Average sunshine days in September
Merrill, OR
- Average sunshine days in September: 24.8 days
The month with the most sunshine days is August (25.7 days).
The month with the least sunshine days is March (11.5 days).
Average UV index in September
Merrill, OR
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in September
Merrill, OR
- Average cloud cover in September: 14
The months with the most cloud cover are March and December (Cloud cover 44).
The months with the least cloud cover are July and August (Cloud cover 8).
Average visibility in September
Merrill, OR
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is January (4mi).
Merrill, Oregon, USA
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