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
A shift in Highland's weather is observed as August turns into September, with the average high temperature reducing from a hot 89.2°F (31.8°C) to a warm 77.9°F (25.5°C). Highland reports a consistent average low-temperature of 57°F (13.9°C) throughout September nights.Humidity
The average relative humidity in September is 43%.Rainfall
In Highland, in September, it is raining for 4.6 days, with typically 0.24" (6mm) of accumulated precipitation. In Highland, Washington, during the entire year, the rain falls for 102.8 days and collects up to 7.32" (186mm) of precipitation.Snowfall
In Highland, snow does not fall in April through October.Daylight
The average length of the day in September is 12h and 31min.On the first day of the month, sunrise is at 6:18 am and sunset at 7:34 pm. On the last day of September, sunrise is at 6:54 am and sunset at 6:37 pm PDT.
Sunshine
The average sunshine in September is 10.7h.UV index
In Highland, the average daily maximum UV index in September 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 average person.Note: The average daily UV index of 5 in September transforms into the following instructions:
Put precautions into practice - Protective measures against sun-induced damage are advised. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures?
What is the average humidity in September in Highland?
How much does it rain in September?
When it does not snow?
How many hours of daylight does Highland have in September?
When are sunrise and sunset in September?
How many hours of sunshine does Highland have in September?
What is the UV index reading in September?
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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