September weather forecastMenlo, WA
September
Weather in September
September, the first month of the autumn in Menlo, is still a comfortable month, with temperature in the range of an average high of 66.6°F (19.2°C) and an average low of 49.6°F (9.8°C).Temperature
The shift from August to September is characterized by an average high-temperature of a refreshing 66.6°F (19.2°C), not significantly different from the 70.7°F (21.5°C) of August. In Menlo, an average nighttime temperature of 49.6°F (9.8°C) is expected during September.Humidity
In Menlo, the average relative humidity in September is 83%.Rainfall
In Menlo, in September, it is raining for 7.2 days, with typically 0.39" (10mm) of accumulated precipitation. Throughout the year, in Menlo, Washington, there are 126 rainfall days, and 8.5" (216mm) of precipitation is accumulated.Snowfall
In Menlo, snow does not fall in April through October and December.Daylight
In September, the average length of the day 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, sunrise is at 7:13 am and sunset at 6:55 pm PDT.
Sunshine
In Menlo, the average sunshine in September is 8.2h.UV index
In Menlo, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: During September, 4 as the daily maximum UV index converts into the following advice:
Exercise prevention - Warding off sunburn is urged. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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 30min
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 12min
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).
