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 onset of September brings a small shift in high-temperatures, falling from 81.1°F (27.3°C) in August to a still warm 73.4°F (23°C). In Waterloo, following the steep rise of daytime temperatures, an average nighttime low of 48.9°F (9.4°C) is anticipated during September.Humidity
In September, the average relative humidity in Waterloo is 71%.Rainfall
In Waterloo, in September, during 8.8 rainfall days, 1.5" (38mm) of precipitation is typically accumulated. In Waterloo, during the entire year, the rain falls for 163.3 days and collects up to 29.92" (760mm) of precipitation.Snowfall
In Waterloo, Oregon, snow does not fall in April through October.Daylight
In Waterloo, the average length of the day in September is 12h and 30min.On the first day of September, sunrise is at 6:34 am and sunset at 7:47 pm. On the last day of the month, sunrise is at 7:08 am and sunset at 6:53 pm PDT.
Sunshine
In Waterloo, Oregon, the average sunshine in September is 9.4h.UV index
In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: During September, 4 as the daily maximum UV index converts into the following advice:
Adopt protective measures - Suggestions to resist sunburn are offered. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes.
Frequently asked questions
What are the temperatures in Waterloo in September?
What is the average humidity in September in Waterloo?
How much does it rain in Waterloo in September?
When it does not snow in Waterloo?
What is the average length of the day in September in Waterloo?
When are sunrise and sunset in September in Waterloo?
How long on average sun shines in September in Waterloo?
What is the UV index reading in September in Waterloo?
Average temperature in September
Waterloo, OR
- Average high temperature in September: 73.4°F
The warmest month (with the highest average high temperature) is August (81.1°F).
The month with the lowest average high temperature is December (45.3°F).
- Average low temperature in September: 48.9°F
The month with the highest average low temperature is August (51.8°F).
The coldest month (with the lowest average low temperature) is December (34.2°F).
Average pressure in September
Waterloo, OR
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The months with the lowest atmospheric pressure are August and September (30.01"Hg).
Average wind speed in September
Waterloo, OR
- Average wind speed in September: 4mph
The windiest months (with the highest average wind speed) are January and March (5.1mph).
The calmest month (with the lowest average wind speed) is August (3.9mph).
Average humidity in September
Waterloo, OR
- Average humidity in September: 71%
The months with the highest relative humidity are January, February, March and December (86%).
The month with the lowest relative humidity is August (66%).
Average rainfall in September
Waterloo, OR
- Average rainfall in September: 1.5"
The wettest month (with the highest rainfall) is December (4.41").
The driest month (with the least rainfall) is July (0.24").
Average rainfall days in September
Waterloo, OR
- Average rainfall days in September: 8.8 days
The month with the highest number of rainy days is March (20.1 days).
The months with the least rainy days are July and August (3.8 days).
Average snowfall in September
Waterloo, OR
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.13").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Waterloo, OR
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.5 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
Waterloo, OR
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in September: 9h and 2min
The month with the most sunshine is August (Average sunshine: 11h and 12min).
The month with the least sunshine is February (Average sunshine: 4h and 12min).
Average sunshine days in September
Waterloo, OR
- Average sunshine days in September: 19.3 days
The month with the most sunshine days is July (25.6 days).
The month with the least sunshine days is March (9.1 days).
Average UV index in September
Waterloo, OR
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Waterloo, OR
- Average cloud cover in September: 30
The month with the most cloud cover is February (Cloud cover 59).
The month with the least cloud cover is August (Cloud cover 20).
Average visibility in September
Waterloo, OR
- Average visibility in September: 6mi
The months with the highest visibility are July, August and September (6mi).
The month with the lowest visibility is February (4mi).
Waterloo, Oregon, USA
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