Country Overview For United States Of America
For Washington The wettest month for Washington
HISTORICAL MONTHLY AVERAGES FOR SEPTEMBER
The information presented below gives detailed historical monthly average weather conditions along with exceptional weather occurrences. To maintain relevance to current weather trends the displayed information has been calculated using data collected over the past two decades. The climate profile is taken from closest available data source to Methow Valley.
Throughout the month of September daytime temperatures will generally reach highs of around 26°C that's about 78°F. At night the average minimum temperature drops down to around 8°C, that's 47°F.
In recent times the highest recorded temperature in September has been 38°C that's 100°F, with the lowest recorded temperature -1°C, about 30°F.
The average daily relative humidity for September is around 56%.
The Heat Index is a measure of how hot it feels when relative humidity is added to actual air temperature. From this a comfort level is calculated providing categories on how heat conditions might adversely affect someone.
Comfort Levels: Given average maximum temperatures and humidity levels generally you should not anticipate any discomfort from heat (see heat index for more information).
The average monthly amount of precipitation has been recorded at around 23 mm, that's 1 inches.
The average daily wind speed in September has been around 6 km/h, that’s the equivalent to about 4 mph, or 3 knots. In recent years the maximum sustained wind speed has reached 41 km/h, that’s the equivalent of around 25 mph, or 22 knots.
YEARLY TRENDS: WEATHER AVERAGES & EXTREMES
The following charts show yearly weather trends with information on monthly weather averages and extremes.
The chart below plots the average high and low temperature for each month of the year. It also shows the maximum and minimum recorded temperatures.
The chart below plots the average monthly precipitation amount.
The chart below plots the average daily wind speed you can expect for any month. It also shows the maximum recorded sustained wind speed for each month.