Temperatures in September
It's cool in September in Fort William with an average temperature of 12°C. Temperatures this month range from a low of 10°C to a high of 16°C. At night, you can expect temperatures between 5°C and 8°C.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for Fort William in September. The red line indicates the max temperatures, and the blue line shows the minimums.
Start of September
The month of September starts in Fort William with cool temperatures, averaging around 14°C during the day and nights close to 8°C. A few showers might pop up in the first days of the month, but the weather remains mostly sunny and dry.
Mid-September
By mid-September, the average daytime temperature drops to around 13°C, with nights close to 6°C. During this part of the month, you can expect regular precipitation, but there’ll also be some sunny days.
End of September
By the end of September, the average daytime temperature in Fort William will be around 12°C, with nights close to 6°C. There’s regular precipitation, but with a bit of luck, you’ll also get some dry and sunny days.
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Water temperature
The water temperature at Fort William is 15°C this month. This is probably too cold to swim without protective gear.
Precipitation in September
In September, there is an average of 117 mm of precipitation, spread over 15 days. The wind speed is around 6 Bft, mostly coming from the Southwest.
Across the whole month, the average precipitation chance is 51% per day. Though it seems average, the weather’s variable. Some days have a higher chance of precipitation.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in September for Fort William. 0% means it never rained on that day in the past 10 years, and 100% means it rained every day. All values in between represent the average chance of precipitation on that day.
Fort William in September |
London | ||
|---|---|---|---|
 Average Temperature |
12°C | 20°C | |
 High Temp |
16°C | 22°C | |
| Low Temp |
10°C | 17°C | |
 Total Precipitation |
117 mm | 44 mm | |
| Rainy Days |
15 days | 8 days | |
August
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 Fort William?
After some sun? Then September isn’t the best time to be in Fort William. There’s too much chance of rain this month.
Temperature records for Fort William in September
With 26°C, Fort William hit the highest temperature in the last 10 years in September 2023. The lowest daytime temperature in this month was 3°C in 2015. The extreme night temperatures ranged from a low of -2°C to a high of 15°C.
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Daily Temperature in September in Fort William
This chart shows the average daily temperatures, both day and night, for each day in September in Fort William, 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 Fort William
The chart below shows the average daily precipitation in September for Fort William, 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 15 days of rain in Fort William.
Daily UV Index in September in Fort William
This chart shows the average daily UV index in September in Fort William, 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 Fort William Over the Years
This chart shows the average temperature in September in Fort William, measured in degrees Celsius, over the past years.
Total Precipitation in September in Fort William Over the Years
This chart shows the average precipitation in September in Fort William, 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 Fort William
Click on a specific day in September for detailed info on the typical weather on that day in Fort William. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in September in Fort William
Have you been to Fort William in September?
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Average Weather in Fort William by Month
Click on a month below to see detailed weather info for Fort William. 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 Fort William for all months at once
