Normal weather for Rainier in September
It's warm in September in Rainier with an average temperature of 23°C. Temperatures this month range from a low of 19°C to a high of 26°C. At night, you can expect temperatures between 8°C and 13°C.
In September, there is an average of 126 mm of precipitation, spread over 15 days. The wind speed is around 3 Bft, mostly coming from the South.
Rainier in September |
New York | ||
|---|---|---|---|
 Average Temperature |
23°C | 27°C | |
 High Temp |
26°C | 31°C | |
| Low Temp |
19°C | 21°C | |
 Total Precipitation |
126 mm | 57 mm | |
| Rainy Days |
15 days | 9 days | |
Start of September
The month of September starts in Rainier with warm temps, averaging around 25°C during the day and nights around 12°C. A few showers might pop up early in the month, but overall, it’ll stay mostly sunny and dry.
With the temperature difference between day and night, it’s smart to wear layers. A T-shirt, light pants or skirt, and a light jacket are great for the day. In the evening and morning, choose a light jacket, sweater or hoodie, and long pants.
Mid September
By mid-September, daytime temps drop to around 22°C, with nights around 11°C. During this part of the month, you might see regular precipitation, but there will also be some sunny days.
Since it cools down at night, it’s a good idea to wear layers. A T-shirt, light pants or skirt, and a light jacket are great for the day. In the evening and morning, choose a light jacket, sweater or hoodie, and long pants.
End of September
By the end of September, the average daytime temperature in Rainier is around 21°C, while nighttime temps are about 10°C. Expect regular precipitation, but if you’re lucky, you’ll also get some dry and sunny days.
Because temperatures drop in the evening, wearing layers is recommended. During the day, a shirt, maybe a light sweater, and thin pants will do. In the evening and morning, go for a warm jacket, sweater or hoodie, and long pants.
UV index
The UV index is a maximum of 5 this month. That's a moderate value on the intensity scale of 1 to 11. Unprotected skin can burn in about 30 minutes.
Is September a good time to visit Rainier?
Looking for sun? September isn’t a good month to be in Rainier. The temperature is nice, but there’s too much chance of rain.
Temperature records for Rainier in September
Check out the climate of Rainier for all months and discover the best travel time
August
Daily Temperature in September in Rainier
This chart shows the average daily high and low temperatures in September for Rainier, in degrees Celsius. The red line represents the highs, and the blue line shows the lows. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, provide the average temperatures for this month.
Daily Precipitation in September in Rainier
The chart below shows the average daily precipitation in September for Rainier, measured in millimeters over the past few years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are listed at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that it rained more often. But remember, it’s just an average, and every day can be different. Based on historical weather data for September, you can expect about 15 days of precipitation in Rainier.
Daily UV Index in September in Rainier
This chart shows the average daily UV index in September in Rainier, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Temperature in September in Rainier Over the Years
This chart shows the average temperature in September in Rainier, measured in degrees Celsius, over the past few years.
Total Precipitation in September in Rainier Over the Years
This chart shows the average precipitation in September in Rainier, measured in millimeters over the past years. Precipitation is always measured as water, whether it’s snow or hail.
Daily Climate in September for Rainier
Click on any day in September to get detailed info about the usual weather on that day in Rainier. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in September in Rainier
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Average Weather in Rainier by Month
Click on a month below to see detailed weather info for Rainier. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
