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September Weather in Northern Ireland United Kingdom

We show the September climate in Northern Ireland by comparing the average September weather in 2 representative places: Belfast and Derry.

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Belfast
United Kingdom
Derry
United Kingdom
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Average High and Low Temperature in September in Northern Ireland

Average High and Low Temperature in September in Northern IrelandSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303040°F40°F45°F45°F50°F50°F55°F55°F60°F60°F65°F65°FAugOct525048636158474946504845626057DerryDerryBelfastBelfast
The daily average high and low air temperature at 2 meters above the ground. The thin dotted lines are the corresponding perceived temperatures.

Belfast in September

Average Hourly Temperature in Belfast in SeptemberSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMAugOctcoldcool

Derry in September

Average Hourly Temperature in Derry in SeptemberSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMAugOctcoldcoolcool
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Chance of Clearer Skies in September in Northern Ireland

Chance of Clearer Skies in September in Northern IrelandSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%AugOct484543444140DerryDerry
The percentage of time the sky is clear, mostly clear, or partly cloudy (i.e., less than 60% of the sky is covered by clouds).

Daily Chance of Precipitation in September in Northern Ireland

Daily Chance of Precipitation in September in Northern IrelandSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%AugOct333333403938DerryDerryBelfastBelfast
The percentage of days in which precipitation is observed, excluding trace quantities.

Average Monthly Rainfall in September in Northern Ireland

Average Monthly Rainfall in September in Northern IrelandSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300.0 in0.0 in0.5 in0.5 in1.0 in1.0 in1.5 in1.5 in2.0 in2.0 in2.5 in2.5 in3.0 in3.0 in3.5 in3.5 in4.0 in4.0 inAugOct2.52.62.93.03.03.2DerryDerryBelfastBelfast
The average rainfall accumulated over the course of a sliding 31-day period centered on the day in question.

Hours of Daylight in September in Northern Ireland

Hours of Daylight in September in Northern IrelandSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 hr0 hr4 hr4 hr8 hr8 hr12 hr12 hr16 hr16 hr20 hr20 hr24 hr24 hrAugOct13.712.711.6DerryDerryBelfastBelfast
The number of hours during which the Sun is at least partly above the horizon.

Chance of Muggy Conditions in September in Northern Ireland

Chance of Muggy Conditions in September in Northern IrelandSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%AugOctDerryDerry
The percentage of time that is muggy, oppressive, or miserable (i.e., a dew point greater than 65°F).

Average Wind Speed in September in Northern Ireland

Average Wind Speed in September in Northern IrelandSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mph16 mph16 mphAugOct12.313.013.7DerryDerryBelfastBelfast
The average of mean hourly wind speeds at 10 meters above the ground.

Tourism Score in September in Northern Ireland

Tourism Score in September in Northern IrelandSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303000224466881010AugOct5.04.33.3DerryDerryBelfastBelfast
The tourism score, which favors clear, rainless days with perceived temperatures between 65°F and 80°F.

Beach/Pool Score in September in Northern Ireland

Beach/Pool Score in September in Northern IrelandSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303000224466881010AugOct0.30.1DerryDerryBelfastBelfast
The beach/pool score, which favors clear, rainless days with perceived temperatures between 75°F and 90°F.

Growing Season in September in Northern Ireland

Growing Season in September in Northern IrelandSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%0%20%20%40%40%60%60%80%80%100%100%AugOctDerryDerryBelfastBelfast
The percentage chance that a given day is within the growing season, defined as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

Growing Degree Days in September in Northern Ireland

Growing Degree Days in September in Northern IrelandSep112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030600°F600°F700°F700°F800°F800°F900°F900°F1,000°F1,000°F1,100°F1,100°F1,200°F1,200°FAugOctDerryDerryBelfastBelfast
The average growing degree days accumulated over the course of September, where growing degree days are defined as the integral of warmth above a base temperature (50°F in this case).

Average Water Temperature in September in Northern Ireland

Average Water Temperature in September in Northern IrelandSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303053.5°F53.5°F54.0°F54.0°F54.5°F54.5°F55.0°F55.0°F55.5°F55.5°F56.0°F56.0°F56.5°F56.5°F57.0°F57.0°F57.5°F57.5°F58.0°F58.0°F58.5°F58.5°FAugOct5757575857DerryDerryBelfastBelfast
The daily average wide-area surface water temperature.

Average Daily Incident Shortwave Solar Energy in September in Northern Ireland

Average Daily Incident Shortwave Solar Energy in September in Northern IrelandSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300.0 kWh0.0 kWh0.5 kWh0.5 kWh1.0 kWh1.0 kWh1.5 kWh1.5 kWh2.0 kWh2.0 kWh2.5 kWh2.5 kWh3.0 kWh3.0 kWh3.5 kWh3.5 kWh4.0 kWh4.0 kWh4.5 kWh4.5 kWh5.0 kWh5.0 kWh5.5 kWh5.5 kWhAugOct4.03.32.5DerryDerryBelfastBelfast
The average daily shortwave solar energy reaching the ground per square meter.

This report illustrates the typical weather for Belfast and Derry, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

The details of the data sources used on this page vary between places and are discussed in detail on each place's dedicated page:

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.

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