United StatesAverage weather for Belfast in September
It's warm in September in Belfast with an average temperature of 29°C. Temperatures this month range from a low of 26°C to a high of 31°C. At night, you can expect temperatures between 14°C and 20°C.
Start of September
The month of September starts in Belfast with hot temps, averaging around 31°C during the day and nights around 19°C. There’s little chance of precipitation. The weather’s mostly sunny and dry.
With the temperature difference between day and night, it’s smart to wear layers.
Mid September
By mid-September, daytime temps drop to around 29°C, with nights around 18°C. There’s a chance of some showers during this time, but plenty of dry and sunny days too.
Since it cools down at night, it’s a good idea to wear layers.
End of September
By the end of September, the average daytime temperature in Belfast is around 28°C, while nighttime temps are about 16°C. A shower might pop up, but overall, the weather will be dry and sunny.
Because temperatures drop in the evening, wearing layers is recommended.
In September, there is an average of 45 mm of precipitation, spread over 5 days. The wind speed is around 3 Bft, mostly coming from the Southeast.
Belfast in September |
New York | ||
|---|---|---|---|
 Average temperature |
29°C | 27°C | |
 Max. temperature |
31°C | 31°C | |
| Min. temperature |
26°C | -5°C | |
 Total precipitation |
45 mm | 57 mm | |
| Rainy days |
5 days | 9 days | |
August
UV index
The UV index is a maximum of 7 this month. That's a moderate to high value on the intensity scale of 1 to 11. Unprotected skin can burn within 15-25 minutes.
Is September a good time to visit Belfast?
Looking for great weather? September is a good time to be in Belfast. The temperatures are nice, and there’s not too much rain.
Temperature records
With 36°C in 2019, Belfast reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was 16°C in 2017. The extreme nighttime temperatures ranged from a lowest recorded value of 5°C to a highest value of 24°C.
Check out the climate of Belfast for all months and discover the best travel time
Daily Temperature in September in Belfast
This chart shows the average daily high and low temperatures in September for Belfast, 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 Belfast
The chart below shows the average daily precipitation in September for Belfast, 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 5 days of precipitation in Belfast.
Daily UV index in September in Belfast
This chart shows the average daily UV index in September in Belfast, 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 Belfast over the years
This chart shows the average temperature in September in Belfast, measured in degrees Celsius, over the past few years.
Total precipitation in September in Belfast over the years
This chart shows the average precipitation in September in Belfast, measured in millimeters over the past years. Precipitation is always measured as water, whether it’s snow or hail.
Daily weather in September for Belfast
Click on any day in September to get detailed info about the usual weather on that day in Belfast. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in September in Belfast
Have you been to Belfast in September?
Share your weather experience in September in Belfast.
Average weather in Belfast by month
Click on a month below to see detailed weather info for Belfast. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
