Normal weather for Grand Lake in September
It's hot in September in Grand Lake with an average temperature of 32°C. Temperatures this month range from a low of 29°C to a high of 34°C. At night, you can expect temperatures between 21°C and 25°C.
In September, there is an average of 170 mm of precipitation, spread over 18 days. The wind speed is around 3 Bft, mostly coming from the Southeast.
Grand Lake in September |
London | ||
|---|---|---|---|
 Average Temperature |
32°C | 20°C | |
 High Temp |
34°C | 22°C | |
| Low Temp |
29°C | 17°C | |
 Total Precipitation |
170 mm | 44 mm | |
| Rainy Days |
18 days | 8 days | |
Start of September
The month of September starts in Grand Lake with hot temperatures, averaging around 33°C during the day and nights close to 25°C. You can expect regular precipitation, but there’s also a chance for some sunny days in the first days of the month. Breezy clothes like shorts or a dress, plus a hat and sunglasses, are ideal.
Mid-September
By mid-September, the average daytime temperature drops to around 32°C, with nights close to 24°C. During this part of the month, you can expect regular precipitation, but there’ll also be some sunny days. Breezy clothes like shorts or a dress, plus a hat and sunglasses, are ideal.
End of September
By the end of September, the average daytime temperature in Grand Lake will be around 31°C, with nights close to 22°C. There’s a significant chance of many days with precipitation.
As it gets cooler in the evening, it’s best to wear layers. Breezy clothes like shorts or a dress, plus a hat and sunglasses, are ideal for the day. In the evening and morning, a T-shirt, light trousers or skirt, and a light jacket are recommended.
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UV index
The UV index is a maximum of 9 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.
Is September a good time to visit Grand Lake?
After some sun? Then September isn’t the best time to be in Grand Lake. The temperature is pleasant, but there’s too much chance of rain this month.
The hurricane season in Grand Lake runs from June to November.
Temperature records for Grand Lake in September
With 38°C, Grand Lake hit the highest temperature in the last 10 years in September 2023. The lowest daytime temperature in this month was 23°C in 2020. The extreme night temperatures ranged from a low of 11°C to a high of 27°C.
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Daily Temperature in September in Grand Lake
This chart shows the average daily temperatures, both day and night, for each day in September in Grand Lake, measured in degrees Celsius. The red line represents the maximum temperatures, while the blue line shows the minimums. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, gives an overview of the average daily temperatures during this month.
Daily Precipitation in September in Grand Lake
The chart below shows the average daily precipitation in September for Grand Lake, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are shown 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 rain is more likely. But it’s still an average, so each day can be different. Based on historical weather data for September, you can expect around 18 days of rain in Grand Lake.
Daily UV Index in September in Grand Lake
This chart shows the average daily UV index in September in Grand Lake, 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 Grand Lake Over the Years
This chart shows the average temperature in September in Grand Lake, measured in degrees Celsius, over the past years.
Total Precipitation in September in Grand Lake Over the Years
This chart shows the average precipitation in September in Grand Lake, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Daily climate in September for Grand Lake
Click on a specific day in September for detailed info on the typical weather on that day in Grand Lake. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in September in Grand Lake
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Average Weather in Grand Lake by Month
Click on a month below to see detailed weather info for Grand Lake. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
Or check out the climate of Grand Lake for all months at once
