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 brings a decrease in the average high-temperature, falling from August's tropical 89.2°F (31.8°C) to a moderately hot 77.9°F (25.5°C). An average nighttime temperature of 57°F (13.9°C) is observed in Highland during September.Humidity
In Highland, the average relative humidity in September is 43%.Rainfall
In Highland, Washington, in September, it is raining for 4.6 days, with typically 0.24" (6mm) of accumulated precipitation. Throughout the year, there are 102.8 rainfall days, and 7.32" (186mm) of precipitation is accumulated.Snowfall
April through October are months without snowfall.Daylight
The average length of the day in September in Highland is 12h and 31min.On the first day of September, sunrise is at 6:18 am and sunset at 7:34 pm. On the last day of the month, sunrise is at 6:54 am and sunset at 6:37 pm PDT.
Sunshine
In Highland, the average sunshine in September is 10.7h.UV index
In September, the average daily maximum UV index in Highland is 5. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for the ordinary person.Note: The daily maximum UV index of 5 in September interprets into the following advice:
Adopt protective measures - It is advised to guard against sun damage. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.
Frequently asked questions
What is the temperature in September in Highland?
What is the average humidity in September in Highland?
How much does it rain in Highland in September?
When it does not snow in Highland?
How many hours of daylight does Highland have in September?
When are sunrise and sunset in September in Highland?
How many hours of sunshine does Highland have in September?
How high is the UV index in September in Highland?
Average temperature in September
Highland, WA
- Average high temperature in September: 77.9°F
The warmest month (with the highest average high temperature) is July (90.1°F).
The month with the lowest average high temperature is December (38.3°F).
- Average low temperature in September: 57°F
The month with the highest average low temperature is August (64°F).
The coldest month (with the lowest average low temperature) is December (27.9°F).
Average pressure in September
Highland, WA
- Average pressure in September: 29.95"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is August (29.91"Hg).
Average wind speed in September
Highland, WA
- Average wind speed in September: 6.7mph
The windiest month (with the highest average wind speed) is April (8.5mph).
The calmest month (with the lowest average wind speed) is December (5.8mph).
Average humidity in September
Highland, WA
- Average humidity in September: 43%
The month with the highest relative humidity is January (80%).
The month with the lowest relative humidity is July (35%).
Average rainfall in September
Highland, WA
- Average rainfall in September: 0.24"
The wettest months (with the highest rainfall) are March and December (0.94").
The driest month (with the least rainfall) is July (0.2").
Average rainfall days in September
Highland, WA
- Average rainfall days in September: 4.6 days
The month with the highest number of rainy days is March (13.3 days).
The month with the least rainy days is July (3.5 days).
Average snowfall in September
Highland, WA
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.2").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Highland, WA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (3.1 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Highland, WA
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in September: 10h and 4min
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
Highland, WA
- Average sunshine days in September: 24 days
The month with the most sunshine days is July (25.7 days).
The month with the least sunshine days is March (15.4 days).
Average UV index in September
Highland, WA
- 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
Highland, WA
- Average cloud cover in September: 16
The month with the most cloud cover is January (Cloud cover 44).
The month with the least cloud cover is July (Cloud cover 9).
Average visibility in September
Highland, WA
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Highland, Washington, USA
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