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 onset of September results in a decrease in the average high-temperature, receding from a tropical 89.4°F (31.9°C) in August to a warm 78.4°F (25.8°C). A striking departure from daytime highs to an average low-temperature of 55.9°F (13.3°C) is witnessed during September.Humidity
In Harper, the average relative humidity in September is 35%.Rainfall
In Harper, in September, it is raining for 2.8 days, with typically 0.12" (3mm) of accumulated precipitation. Throughout the year, in Harper, there are 57 rainfall days, and 2.99" (76mm) of precipitation is accumulated.Snowfall
May through October are months without snowfall.Daylight
In September, the average length of the day in Harper is 12h and 29min.On the first day of the month, sunrise is at 7:14 am and sunset at 8:25 pm. On the last day of September, sunrise is at 7:47 am and sunset at 7:32 pm MDT.
Sunshine
In September, the average sunshine is 9.6h.UV index
The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for the average person.Note: The maximum UV index, 5 during September, leads to the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection.
Frequently asked questions
What are the temperatures in Harper in September?
What is the average humidity in September in Harper?
How many days does it rain in September in Harper?
When it does not snow in Harper?
How many hours of daylight does Harper have in September?
When are sunrise and sunset in September in Harper?
How long on average sun shines in September in Harper?
What is the UV index reading in September in Harper?
Average temperature in September
Harper, OR
- Average high temperature in September: 78.4°F
The warmest month (with the highest average high temperature) is July (91°F).
The month with the lowest average high temperature is December (34.3°F).
- Average low temperature in September: 55.9°F
The month with the highest average low temperature is August (63.5°F).
The coldest months (with the lowest average low temperature) are January and December (22.1°F).
Average pressure in September
Harper, OR
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.24"Hg).
The month with the lowest atmospheric pressure is August (29.92"Hg).
Average wind speed in September
Harper, OR
- Average wind speed in September: 5.8mph
The windiest month (with the highest average wind speed) is April (7.1mph).
The calmest month (with the lowest average wind speed) is January (3.9mph).
Average humidity in September
Harper, OR
- Average humidity in September: 35%
The month with the highest relative humidity is January (83%).
The months with the lowest relative humidity are July and August (28%).
Average rainfall in September
Harper, OR
- Average rainfall in September: 0.12"
The wettest months (with the highest rainfall) are March and May (0.39").
The driest months (with the least rainfall) are July and August (0.08").
Average rainfall days in September
Harper, OR
- Average rainfall days in September: 2.8 days
The month with the highest number of rainy days is March (8.4 days).
The month with the least rainy days is August (2.3 days).
Average snowfall in September
Harper, OR
- Average snowfall in September: 0"
The month with the highest snowfall is December (1.77").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Harper, OR
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (6.1 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Harper, OR
- 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: 9h and 4min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 12min).
Average sunshine days in September
Harper, OR
- Average sunshine days in September: 26.5 days
The month with the most sunshine days is July (26.8 days).
The month with the least sunshine days is March (20.1 days).
Average UV index in September
Harper, OR
- Average UV index in September: 5
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Harper, OR
- Average cloud cover in September: 14
The months with the most cloud cover are January and December (Cloud cover 43).
The months with the least cloud cover are July and August (Cloud cover 8).
Average visibility in September
Harper, OR
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (5mi).
Harper, Oregon, USA
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