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 implies a soft temperature shift, with average high-temperatures reducing from August's pleasant 72.3°F (22.4°C) to a comfortable 66.2°F (19°C). Throughout September, the average low-temperature in Cathan dips to a chilly 49.1°F (9.5°C).Humidity
In September, the average relative humidity in Cathan is 78%.Rainfall
In Cathan, during September, the rain falls for 13.5 days and regularly aggregates up to 2.05" (52mm) of precipitation. Throughout the year, there are 188.6 rainfall days, and 34.92" (887mm) of precipitation is accumulated.Snowfall
May through October are months without snowfall.Daylight
In Cathan, Washington, the average length of the day in September is 12h and 33min.On the first day of the month, sunrise is at 6:28 am and sunset at 7:49 pm. On the last day of September, in Cathan, sunrise is at 7:08 am and sunset at 6:49 pm PDT.
Sunshine
In Cathan, the average sunshine in September is 9.2h.UV index
In September, the average daily maximum UV index in Cathan is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for ordinary individuals.Note: In September, the maximum UV index of 4 suggests this advice:
Exercise prudence. Persons with fair skin could be burned in under 30 minutes. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. Experience reduced UV exposure by about half when donning a wide-brim hat.
Frequently asked questions
What is the temperature in September in Cathan?
What is the average humidity in September in Cathan?
How much does it rain in Cathan in September?
When it does not snow in Cathan?
How many hours of daylight does Cathan have in September?
When are sunrise and sunset in September in Cathan?
How long on average sun shines in September in Cathan?
What is the UV index intensity in September in Cathan?
Average temperature in September
Cathan, WA
- Average high temperature in September: 66.2°F
The warmest month (with the highest average high temperature) is August (72.3°F).
The month with the lowest average high temperature is December (41.7°F).
- Average low temperature in September: 49.1°F
The month with the highest average low temperature is August (51.6°F).
The coldest month (with the lowest average low temperature) is February (33.8°F).
Average pressure in September
Cathan, WA
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The month with the lowest atmospheric pressure is August (30"Hg).
Average wind speed in September
Cathan, WA
- Average wind speed in September: 3.9mph
The windiest months (with the highest average wind speed) are January and November (5.6mph).
The calmest month (with the lowest average wind speed) is August (3.3mph).
Average humidity in September
Cathan, WA
- Average humidity in September: 78%
The months with the highest relative humidity are January, February, November and December (85%).
The month with the lowest relative humidity is July (73%).
Average rainfall in September
Cathan, WA
- Average rainfall in September: 2.05"
The wettest month (with the highest rainfall) is November (4.92").
The driest month (with the least rainfall) is July (0.51").
Average rainfall days in September
Cathan, WA
- Average rainfall days in September: 13.5 days
The month with the highest number of rainy days is March (20.9 days).
The month with the least rainy days is August (6.9 days).
Average snowfall in September
Cathan, WA
- Average snowfall in September: 0"
The month with the highest snowfall is February (4.45").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Cathan, WA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (4.3 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
Cathan, WA
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 24min).
- Average sunshine in September: 9h and 1min
The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 4h and 6min).
Average sunshine days in September
Cathan, WA
- Average sunshine days in September: 15.2 days
The month with the most sunshine days is August (22 days).
The month with the least sunshine days is March (8.1 days).
Average UV index in September
Cathan, WA
- Average UV index in September: 4
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, October, November and December (UV index 2).
Average cloud cover in September
Cathan, WA
- Average cloud cover in September: 34
The month with the most cloud cover is December (Cloud cover 57).
The months with the least cloud cover are July and August (Cloud cover 26).
Average visibility in September
Cathan, WA
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February, November and December (5mi).
Cathan, Washington, USA
Weather forecast for your location
2. Allow the app to use your location
