Blackburn weather in September

In September, Blackburn sees average daytime highs of 16°C and overnight lows near 10°C, with 91 mm of rain across 13.6 wet days and about 12.5 hours of daylight. It is the 4th-warmest and 8th-wettest month of the year here.

Highs ease over the month, from about 17°C in the first days to 15°C by the end. The sky is clear or mostly clear about 9% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 30 min at the start of September to 11 h 24 min by month's end. Set against the rest of the year, September is Blackburn's 6th-clearest and 9th-windiest month. For the whole year in context, see Blackburn's year-round climate.

Daytime high
16°
4th warmest
Overnight low
10°
9th coldest
Rainfall
91 mm
13.6 wet days
Daylight
12 h 24 min
5:52 AM – 6:17 PM
Cloud cover
74%
6th clearest
Wind
14 km/h
9th windiest
Solar energy
2.81 kWh/m²
Travel score
4.4
out of 10

Blackburn is town in Lancashire, England.

Density
5,980/km²
people per km²

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 17°C in the first days to 15°C by the end.

A typical September day in Blackburn reaches about 16°C in the afternoon and slips back to 10°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 13°C and 19°C. Set against its neighbours, September runs about 2°C cooler than August and about 3°C warmer than October.

10°15°20°25°151015202530
Avg high (°C)Avg low (°C)
11711
21711
31711
41711
51711
61710
71710
81710
91710
101710
111710
121710
131610
141610
151610
161610
171610
181610
191610
20169
21169
22169
23159
24159
25159
26159
27159
28159
29159
30159

How September really feels in Blackburn

Once humidity and wind are folded in, September averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Blackburn weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 10316.32.37.80.5
Feb / 89142.49.40.7
Mar / 8413.81.611.51.5
Apr12° / 7513.60.513.72.7
May15° / 8013.6015.63.9
Jun17° / 10°9114.3016.74.7
Jul19° / 12°9915.9016.35.1
Aug18° / 12°10816.4014.64.9
Sep16° / 10°9113.6012.54.4
Oct13° / 10815.40.110.23.0
Nov / 10716.40.58.31.5
Dec / 11916.21.67.30.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 9% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 76%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
12872
22872
32872
42872
52773
62674
72674
82674
92674
102674
112674
122674
132575
142575
152575
162476
172377
182278
192278
202278
212179
222278
232278
242278
252278
262179
272179
282377
292377
302377

Chance of precipitation in September

Any precipitation

Blackburn gets around 91 mm of rain over 13.6 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 46% and peaks near 49% on the wettest days.

0%20%40%60%151015202530
Rain chance (%)
145
245
344
445
545
645
745
846
946
1046
1146
1246
1346
1446
1546
1646
1745
1845
1945
2045
2145
2245
2345
2446
2547
2647
2748
2849
2949
3049

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the dry band about 86% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
177212
278202
378202
478202
579192
679192
780182
881181
982171
1082171
1183161
1284151
1385141
1486131
1586131
1687121
1788111
1888111
1989101
2090100
2190100
2290100
239190
249190
259190
269190
279280
289280
299280
309280

Wind in September

Winds average 14 km/h in September.

Across September, daily wind ranges from about 14 km/h on the calmest days to 15 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
114light breeze
214light breeze
314light breeze
414light breeze
514light breeze
614light breeze
714light breeze
814light breeze
914light breeze
1014light breeze
1114light breeze
1214light breeze
1314light breeze
1414light breeze
1514light breeze
1614light breeze
1714light breeze
1814light breeze
1914light breeze
2014light breeze
2115light breeze
2215light breeze
2315light breeze
2415light breeze
2515light breeze
2615light breeze
2715light breeze
2815light breeze
2915light breeze
3015light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 30 min at the start of September to 11 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 126 minutes over September. Sunrise moves from 5:24 AM to 6:17 AM, and sunset from 6:55 PM to 5:41 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.55:246:55
213.45:266:52
313.45:286:50
413.35:306:47
513.25:326:45
613.25:336:42
713.15:356:40
813.05:376:37
912.95:396:35
1012.95:416:32
1112.85:426:30
1212.75:446:27
1312.65:466:25
1412.65:486:22
1512.55:506:19
1612.45:526:17
1712.35:536:14
1812.35:556:12
1912.25:576:09
2012.15:596:07
2112.16:016:04
2212.06:036:01
2311.96:045:59
2411.86:065:56
2511.86:085:54
2611.76:105:51
2711.66:125:49
2811.56:145:46
2911.56:165:44
3011.46:175:41

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 2.81 kWh/m².

For context, solar energy here swings from a low near 0.49 kWh/m² to a high of 5.07 kWh/m² in June across the year — September's 2.81 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.4Moderate
23.4Moderate
33.3Moderate
43.3Moderate
53.2Moderate
63.2Moderate
73.2Moderate
83.1Moderate
93.1Moderate
103.0Moderate
113.0Moderate
123.0Moderate
132.9Moderate
142.9Moderate
152.8Moderate
162.8Moderate
172.7Moderate
182.7Moderate
192.6Moderate
202.6Moderate
212.6Moderate
222.5Moderate
232.5Moderate
242.4Moderate
252.4Moderate
262.3Moderate
272.3Moderate
282.3Moderate
292.2Moderate
302.2Moderate
Planning a trip in September

Is September a good time to visit Blackburn?

Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

4.4
Sightseeing
4th-best month of the year
0.7
Beach & pool
4th-best month of the year

September is a reasonable time to visit Blackburn for sightseeing.

What to pack for Blackburn in September

From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In September, Blackburn sees daytime highs around 16°C and nights near 10°C. Pack rain gear. Worth having: a warm layer. About 14 days see rain.

rain geara warm layer

Sea temperature near Blackburn in September

The nearest coast averages about 16°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 44 km away) is warmest in August at about 17°C and coldest in February near 6°C.

The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.

5°10°15°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcool
Sea temperature (°C)Comfort
Jan7Bracing
Feb6Bracing
Mar7Bracing
Apr9Bracing
May11Bracing
Jun14Bracing
Jul16Cool
Aug17Cool
Sep16Cool
Oct14Bracing
Nov11Bracing
Dec9Bracing

UV index in Blackburn in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Blackburn peaks around August 12 at about 6 (high) — a little sun protection helps at midday. It bottoms out near January 1 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 6 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowAug 12UV 6Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr3Moderate
May6High
Jun5High
Jul5High
Aug6High
Sep4Moderate
Oct2Low
Nov1Low
Dec1Low
Location & terrain

Where is Blackburn?

Blackburn sits at 53.8°N, 2.5°W, 121 m above sea level, in United Kingdom. The nearest listed city is Darwen, 6.0 km away.

Topography around Blackburn

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Blackburn.

Within 3 km, the terrain around Blackburn has only modest variations in elevation — a maximum elevation change of 160 m around an average of 150 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 458 m; within 80 km, large variations in elevation — a maximum elevation change of 791 m.

The land around Blackburn is covered by artificial surfaces (43%), trees (31%) and grassland (25%) within 3 km, grassland (62%) and trees (23%) within 16 km, and grassland (54%) within 80 km.

3 km
160 m
16 km
458 m
80 km
791 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Darwen 6.0 km · Accrington 8.0 km · Haslingden 12 km · Chorley 14 km · Rawtenstall 14 km · Preston 15 km · Leyland 15 km · Rossendale 15 km

United Kingdom travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type D / G / M
230 V · 50 Hz
Prices
≈ 89% of US
price level, 2025
GDP per capita
$57,602
2025
Happiness
6.7 / 10
World Happiness, 2025
Safe drinking water
100%
of population, 2024
Homicide rate
1.1
per 100k, 2021
Road deaths
3.2
per 100k/yr, 2019
Income group
High
World Bank
Religion
Christian 60%none 26%Muslim 4%other 2%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Blackburn (53.75°, -2.4833°, elevation 121 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).