Ipswich weather in September

In September, Ipswich sees average daytime highs of 18°C and overnight lows near 13°C, with 54 mm of rain across 9.9 wet days and about 12.4 hours of daylight. It is the 3rd-warmest and 7th-wettest month of the year here.

Highs ease over the month, from about 19°C in the first days to 16°C by the end. The sky is clear or mostly clear about 18% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 24 min at the start of September to 11 h 24 min by month's end. Set against the rest of the year, September is Ipswich's 5th-clearest and 7th-windiest month. For the whole year in context, see Ipswich's year-round climate.

Daytime high
18°
3rd warmest
Overnight low
13°
10th coldest
Rainfall
54 mm
9.9 wet days
Daylight
12 h 24 min
5:38 AM – 6:02 PM
Cloud cover
66%
5th clearest
Wind
18 km/h
7th windiest
Solar energy
3.22 kWh/m²
Travel score
5.6
out of 10

Ipswich is county town of Suffolk, England.

Density
4,846/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 19°C in the first days to 16°C by the end.

A typical September day in Ipswich reaches about 18°C in the afternoon and slips back to 13°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 15°C and 20°C. Set against its neighbours, September runs about 2°C cooler than August and about 4°C warmer than October.

10°15°20°25°151015202530
Avg high (°C)Avg low (°C)
11914
21914
31914
41914
51914
61914
71814
81814
91813
101813
111813
121813
131813
141813
151813
161813
171713
181713
191713
201713
211713
221713
231713
241712
251712
261712
271612
281612
291612
301612

How September really feels in Ipswich

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.

Ipswich weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 6012.20.880.9
Feb / 479.819.60.9
Mar / 4310.20.611.51.7
Apr11° / 419.3013.62.8
May14° / 10°519.7015.44.2
Jun17° / 12°5310.2016.45.4
Jul20° / 15°5711.40166.1
Aug20° / 15°6210.3014.46.1
Sep18° / 13°549.9012.45.6
Oct14° / 10°6711.7010.43.9
Nov10° / 6411.80.28.52.3
Dec / 6512.10.67.61.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 18% 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 63%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13862
23862
34060
44060
54060
64060
74060
84060
94060
104060
114060
124060
133961
143862
153763
163763
173763
183664
193664
203565
213565
223565
233466
243466
253466
263466
273367
283466
293466
303367

Chance of precipitation in September

Any precipitation

Ipswich gets around 54 mm of rain over 9.9 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 33% and peaks near 40% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
128
228
328
428
528
629
729
830
930
1031
1131
1231
1332
1432
1532
1633
1733
1834
1935
2035
2136
2236
2337
2437
2538
2638
2739
2840
2940
3040

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 65% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
1553510
257349
358339
458339
559329
661318
761318
862308
962308
1062308
1163298
1264297
1364297
1464297
1565296
1665296
1766295
1866295
1967294
2067294
2167303
2267303
2367303
2468302
2569292
2669292
2771281
2872271
2973261
3074251

Wind in September

Winds average 18 km/h in September.

Across September, daily wind ranges from about 18 km/h on the calmest days to 19 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
618light breeze
718light breeze
818light breeze
918light breeze
1018light breeze
1118light breeze
1218light 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
2819light breeze
2919light breeze
3019light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 24 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 120 minutes over September. Sunrise moves from 5:13 AM to 6:02 AM, and sunset from 6:38 PM to 5:28 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.45:136:38
213.45:146:35
313.35:166:33
413.25:186:31
513.15:196:28
613.15:216:26
713.05:236:23
812.95:246:21
912.95:266:19
1012.85:286:16
1112.75:296:14
1212.75:316:11
1312.65:336:09
1412.55:346:06
1512.55:366:04
1612.45:386:02
1712.35:395:59
1812.35:415:57
1912.25:435:54
2012.15:455:52
2112.15:465:49
2212.05:485:47
2311.95:505:45
2411.85:515:42
2511.85:535:40
2611.75:555:37
2711.65:575:35
2811.65:585:32
2911.56:005:30
3011.46:025:28

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.22 kWh/m².

For context, solar energy here swings from a low near 0.63 kWh/m² to a high of 5.63 kWh/m² in June across the year — September's 3.22 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.9Moderate
23.8Moderate
33.8Moderate
43.7Moderate
53.7Moderate
63.6Moderate
73.6Moderate
83.5Moderate
93.5Moderate
103.5Moderate
113.4Moderate
123.4Moderate
133.3Moderate
143.3Moderate
153.2Moderate
163.2Moderate
173.1Moderate
183.1Moderate
193.0Moderate
203.0Moderate
213.0Moderate
222.9Moderate
232.9Moderate
242.8Moderate
252.8Moderate
262.7Moderate
272.7Moderate
282.6Moderate
292.6Moderate
302.5Moderate
Planning a trip in September

Is September a good time to visit Ipswich?

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

5.6
Sightseeing
3rd-best month of the year
1.7
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Ipswich for sightseeing.

What to pack for Ipswich in September

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

In September, Ipswich sees daytime highs around 18°C and nights near 13°C. Worth packing: rain gear. About 10 days see rain.

rain gear

Sea temperature near Ipswich in September

The nearest coast averages about 17°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 25 km away) is warmest in August at about 18°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°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°C)Comfort
Jan7Bracing
Feb6Bracing
Mar7Bracing
Apr9Bracing
May12Bracing
Jun15Bracing
Jul17Cool
Aug18Cool
Sep17Cool
Oct15Bracing
Nov12Bracing
Dec9Bracing

UV index in Ipswich 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 Ipswich peaks around June 22 at about 6 (high) — sunscreen and a hat are worth it in the middle of the day. 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJun 22UV 6Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr3Moderate
May6High
Jun6High
Jul6High
Aug6High
Sep4Moderate
Oct2Moderate
Nov1Low
Dec1Low
Location & terrain

Where is Ipswich?

Ipswich sits at 52.1°N, 1.2°E, 18 m above sea level, in United Kingdom. The nearest listed city is Harwich, 16 km away.

Topography around Ipswich

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

Within 3 km, the terrain around Ipswich has only modest variations in elevation — a maximum elevation change of 58 m around an average of 29 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 112 m; within 80 km, only modest variations in elevation — a maximum elevation change of 173 m.

The land around Ipswich is covered by artificial surfaces (48%) and trees (30%) within 3 km, cropland (48%) and grassland (21%) within 16 km, and cropland (42%) and water (30%) within 80 km.

3 km
58 m
16 km
112 m
80 km
173 m
treesgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Harwich 16 km · Felixstowe 17 km · Stowmarket 18 km · Walton-on-the-Naze 25 km · Colchester 26 km · Frinton-on-Sea 26 km · Sudbury 29 km · Clacton-on-Sea 30 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 Ipswich (52.0592°, 1.1555°, elevation 18 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).