Bootle weather in September

In September, Bootle sees average daytime highs of 16°C and overnight lows near 12°C, with 96 mm of rain across 14.1 wet days and about 12.5 hours of daylight. It is the 3rd-warmest and 5th-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 12% 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 Bootle's 6th-clearest and 7th-windiest month. For the whole year in context, see Bootle's year-round climate.

Daytime high
16°
3rd warmest
Overnight low
12°
10th coldest
Rainfall
96 mm
14.1 wet days
Daylight
12 h 24 min
5:54 AM – 6:19 PM
Cloud cover
71%
6th clearest
Wind
19 km/h
7th windiest
Solar energy
2.95 kWh/m²
Travel score
4.5
out of 10

Bootle is town within the Metropolitan Borough of Sefton in Merseyside, England.

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 Bootle reaches about 16°C in the afternoon and slips back to 12°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 14°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°151015202530
Avg high (°C)Avg low (°C)
11713
21713
31713
41713
51713
61713
71713
81713
91713
101713
111713
121713
131712
141612
151612
161612
171612
181612
191612
201612
211612
221612
231612
241612
251612
261612
271511
281511
291511
301511

How September really feels in Bootle

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.

Bootle weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 9116.30.97.80.8
Feb / 7513.80.99.40.9
Mar / 7313.70.711.51.5
Apr11° / 6712.70.113.72.5
May14° / 6912.6015.63.7
Jun16° / 12°8313.6016.74.6
Jul18° / 14°8715.9016.25.1
Aug18° / 14°9916.4014.65.0
Sep16° / 12°9614.1012.54.5
Oct13° / 10°11516.5010.33.2
Nov10° / 115180.18.41.8
Dec / 121170.67.31.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 12% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 19% of September, with mostly cloudy or overcast conditions the remaining 69%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13664
23664
33664
43565
53565
63565
73466
83466
93367
103367
113367
123268
133268
143070
152971
162971
172971
182872
192872
202872
212773
222773
232773
242773
252872
262872
272872
282773
292773
302773

Chance of precipitation in September

Any precipitation

Bootle gets around 96 mm of rain over 14.1 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 48% and peaks near 52% on the wettest days.

0%20%40%60%151015202530
Rain chance (%)
147
247
347
447
547
647
748
848
948
1047
1147
1247
1347
1447
1546
1646
1746
1846
1946
2046
2146
2246
2347
2448
2548
2649
2750
2851
2951
3052

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 80% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
168293
269283
369283
470273
570273
671263
772253
873243
975232
1076222
1177212
1278202
1379192
1481181
1581181
1682171
1783161
1883161
1984151
2084151
2186140
2286140
2386140
2486140
2587130
2687130
2787130
2888120
2988120
3089110

Wind in September

Winds average 19 km/h in September.

Across September, daily wind ranges from about 18 km/h on the calmest days to 20 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202530
Wind speed (km/h)Feels
118light breeze
218light breeze
318light breeze
418light breeze
518light breeze
619light breeze
719light breeze
819light breeze
919light breeze
1019light breeze
1119light breeze
1219light breeze
1319light breeze
1419light breeze
1519light breeze
1619light breeze
1719light breeze
1819light breeze
1919light breeze
2019light breeze
2119light breeze
2219light breeze
2319light breeze
2419light breeze
2519light breeze
2619light breeze
2719light breeze
2820light breeze
2920light breeze
3020light 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 5:27 AM to 6:19 AM, and sunset from 6:57 PM to 5:43 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.55:276:57
213.45:296:54
313.45:316:52
413.35:326:49
513.25:346:47
613.15:366:44
713.15:386:42
813.05:396:39
912.95:416:37
1012.95:436:34
1112.85:456:32
1212.75:476:29
1312.65:486:27
1412.65:506:24
1512.55:526:21
1612.45:546:19
1712.35:566:16
1812.35:576:14
1912.25:596:11
2012.16:016:09
2112.16:036:06
2212.06:056:04
2311.96:076:01
2411.86:085:59
2511.86:105:56
2611.76:125:53
2711.66:145:51
2811.56:165:48
2911.56:175:46
3011.46:195:43

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 2.95 kWh/m².

For context, solar energy here swings from a low near 0.52 kWh/m² to a high of 5.38 kWh/m² in June across the year — September's 2.95 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.6Moderate
23.5Moderate
33.5Moderate
43.5Moderate
53.4Moderate
63.4Moderate
73.3Moderate
83.3Moderate
93.3Moderate
103.2Moderate
113.1Moderate
123.1Moderate
133.1Moderate
143.0Moderate
153.0Moderate
162.9Moderate
172.9Moderate
182.8Moderate
192.8Moderate
202.7Moderate
212.7Moderate
222.6Moderate
232.6Moderate
242.5Moderate
252.5Moderate
262.5Moderate
272.4Moderate
282.4Moderate
292.3Moderate
302.3Moderate
Planning a trip in September

Is September a good time to visit Bootle?

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

4.5
Sightseeing
4th-best month of the year
0.7
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Bootle for sightseeing.

What to pack for Bootle in September

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

In September, Bootle sees daytime highs around 16°C and nights near 12°C. Pack rain gear. Worth having: a warm layer. About 14 days see rain.

rain geara warm layer

Sea temperature near Bootle 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 offshore 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 Bootle 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 Bootle peaks around August 11 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 5 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowAug 11UV 6Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr3Moderate
May5High
Jun5High
Jul5High
Aug6High
Sep4Moderate
Oct2Low
Nov1Low
Dec1Low
Location & terrain

Where is Bootle?

Bootle sits at 53.5°N, 3.0°W, 15 m above sea level, in United Kingdom. The nearest listed city is Litherland, 1.0 km away.

Topography around Bootle

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

Within 3 km, the terrain around Bootle has only modest variations in elevation — a maximum elevation change of 39 m around an average of 11 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 118 m; within 80 km, large variations in elevation — a maximum elevation change of 1,055 m.

The land around Bootle is covered by artificial surfaces (45%) and water (32%) within 3 km, water (32%) and artificial surfaces (21%) within 16 km, and grassland (48%) and water (26%) within 80 km.

3 km
39 m
16 km
118 m
80 km
1,055 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Litherland 1.0 km · Kirkdale 5.0 km · Wallasey 6.0 km · Fazakerley 6.0 km · Liverpool 7.0 km · Norris Green 7.0 km · Maghull 7.0 km · Croxteth 8.0 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 Bootle (53.4667°, -3.0167°, elevation 15 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).