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 arrival of September is marked by an average high-temperature of an enjoyable 66.6°F (19.2°C), bearing a close resemblance to August. The average nighttime temperature in Menlo lowers to a frosty 49.6°F (9.8°C) throughout September.Humidity
In September, the average relative humidity is 83%.Rainfall
In Menlo, during September, the rain falls for 7.2 days and regularly aggregates up to 0.39" (10mm) of precipitation. Throughout the year, in Menlo, there are 126 rainfall days, and 8.5" (216mm) of precipitation is accumulated.Snowfall
April through October and December are months without snowfall in Menlo.Daylight
In September, the average length of the day in Menlo is 12h and 32min.On the first day of the month, sunrise is at 6:35 am and sunset at 7:52 pm. On the last day of September, in Menlo, sunrise is at 7:13 am and sunset at 6:55 pm PDT.
Sunshine
The average sunshine in September in Menlo is 8.2h.UV index
In Menlo, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for the average person.Note: The daily high UV index of 4 in September translates into this advice:
Be cautious. Those with fair skin can be subjected to burns in fewer than 30 minutes. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.
Frequently asked questions
What is the average September temperature in Menlo?
What is the average humidity in September in Menlo?
How much does it rain in Menlo in September?
When it does not snow in Menlo?
How many hours of daylight does Menlo have in September?
When are sunrise and sunset in September in Menlo?
How many hours of sunshine does Menlo have in September?
How high is the UV index in September in Menlo?
Average temperature in September
Menlo, WA
- Average high temperature in September: 66.6°F
The warmest month (with the highest average high temperature) is August (70.7°F).
The month with the lowest average high temperature is December (44.1°F).
- Average low temperature in September: 49.6°F
The month with the highest average low temperature is August (51.4°F).
The coldest month (with the lowest average low temperature) is December (36.3°F).
Average pressure in September
Menlo, WA
- Average pressure in September: 30.02"Hg
The months with the highest atmospheric pressure are January, April and July (30.07"Hg).
The month with the lowest atmospheric pressure is March (30.01"Hg).
Average wind speed in September
Menlo, WA
- Average wind speed in September: 4.8mph
The windiest month (with the highest average wind speed) is January (7mph).
The calmest month (with the lowest average wind speed) is August (4.6mph).
Average humidity in September
Menlo, WA
- Average humidity in September: 83%
The months with the highest relative humidity are November and December (88%).
The months with the lowest relative humidity are June and July (80%).
Average rainfall in September
Menlo, WA
- Average rainfall in September: 0.39"
The wettest month (with the highest rainfall) is December (1.46").
The driest months (with the least rainfall) are July and August (0.16").
Average rainfall days in September
Menlo, WA
- Average rainfall days in September: 7.2 days
The months with the highest number of rainy days are March and December (14.4 days).
The month with the least rainy days is August (4.1 days).
Average snowfall in September
Menlo, WA
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.47").
The months with the least snowfall are April, May, June, July, August, September, October and December (0").
Average snowfall days in September
Menlo, WA
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and February (1.1 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
Menlo, WA
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in September: 8h and 1min
The month with the most sunshine is July (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).
Average sunshine days in September
Menlo, WA
- Average sunshine days in September: 18.7 days
The month with the most sunshine days is August (22.9 days).
The month with the least sunshine days is February (11.5 days).
Average UV index in September
Menlo, 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, November and December (UV index 2).
Average cloud cover in September
Menlo, WA
- Average cloud cover in September: 43
The month with the most cloud cover is January (Cloud cover 64).
The month with the least cloud cover is July (Cloud cover 40).
Average visibility in September
Menlo, WA
- Average visibility in September: 4mi
The months with the highest visibility are January, February, March, April, May, June, October, November and December (5mi).
The months with the lowest visibility are July, August and September (4mi).
Menlo, Washington, USA
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