Winchester weather in September

In September, Winchester sees average daytime highs of 18°C and overnight lows near 11°C, with 56 mm of rain across 9.3 wet days and about 12.4 hours of daylight. It is the 4th-warmest and 10th-wettest month of the year here.

Highs ease over the month, from about 20°C in the first days to 17°C by the end. The sky is clear or mostly clear about 16% 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 30 min by month's end. Set against the rest of the year, September is Winchester's 4th-clearest and 9th-windiest month. For the whole year in context, see Winchester's year-round climate.

Daytime high
18°
4th warmest
Overnight low
11°
9th coldest
Rainfall
56 mm
9.3 wet days
Daylight
12 h 24 min
5:48 AM – 6:11 PM
Cloud cover
68%
4th clearest
Wind
14 km/h
9th windiest
Solar energy
3.18 kWh/m²
Travel score
5.8
out of 10

Winchester is city and unparished area within the larger City of Winchester, Hampshire, 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 20°C in the first days to 17°C by the end.

A typical September day in Winchester reaches about 18°C in the afternoon and slips back to 11°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 15°C and 22°C. Set against its neighbours, September runs about 3°C cooler than August and about 4°C warmer than October.

10°15°20°25°151015202530
Avg high (°C)Avg low (°C)
12012
22012
32012
42012
51911
61911
71911
81911
91911
101911
111911
121911
131911
141811
151811
161811
171811
181811
191810
201810
211810
221810
231710
241710
251710
261710
271710
281710
291710
301710

How September really feels in Winchester

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.

Winchester weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 6711.50.68.21.1
Feb / 529.90.79.61.2
Mar10° / 5010.70.411.52.3
Apr13° / 6111.50.113.53.5
May16° / 6310.3015.34.9
Jun19° / 11°6010.2016.25.9
Jul21° / 13°5710.4015.96.4
Aug21° / 13°6810.6014.46.2
Sep18° / 11°569.3012.45.8
Oct14° / 7611.3010.44.1
Nov11° / 7511.60.18.72.3
Dec / 7111.30.57.81.3

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 16% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 16% of September, with mostly cloudy or overcast conditions the remaining 67%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13466
23466
33466
43466
53565
63565
73565
83466
93466
103466
113466
123466
133466
143466
153367
163268
173268
183268
193268
203268
213268
223268
233268
243169
253169
263070
273169
283169
293169
303169

Chance of precipitation in September

Any precipitation

Winchester gets around 56 mm of rain over 9.3 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 31% and peaks near 38% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
129
229
329
429
529
629
729
829
929
1029
1129
1229
1329
1429
1529
1630
1730
1830
1931
2031
2132
2233
2333
2434
2535
2636
2737
2838
2938
3038

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 72% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
163316
265305
366295
467285
567285
668275
768266
869256
969256
1071245
1171245
1272235
1372235
1474224
1574224
1674224
1774233
1874233
1975232
2074242
2174242
2274251
2374251
2474251
2574251
2674251
2776240
2877230
2978220
3078220

Wind in September

Winds average 14 km/h in September.

Across September, daily wind ranges from about 13 km/h on the calmest days to 14 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
113light breeze
213light breeze
313light breeze
413light breeze
513light breeze
613light 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
2114light breeze
2214light breeze
2314light breeze
2414light breeze
2514light breeze
2614light breeze
2714light breeze
2814light breeze
2914light breeze
3014light breeze

Sunrise & sunset in September

DaylightNight

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

Days shrink by about 114 minutes over September. Sunrise moves from 5:24 AM to 6:11 AM, and sunset from 6:46 PM to 5:38 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.45:246:46
213.35:266:44
313.25:276:41
413.25:296:39
513.15:306:37
613.05:326:35
713.05:346:32
812.95:356:30
912.85:376:28
1012.85:386:25
1112.75:406:23
1212.65:426:21
1312.65:436:18
1412.55:456:16
1512.45:466:13
1612.45:486:11
1712.35:506:09
1812.25:516:06
1912.25:536:04
2012.15:556:02
2112.05:565:59
2212.05:585:57
2311.96:005:55
2411.96:015:52
2511.86:035:50
2611.76:045:47
2711.76:065:45
2811.66:085:43
2911.56:095:40
3011.56:115:38

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.18 kWh/m².

For context, solar energy here swings from a low near 0.7 kWh/m² to a high of 5.49 kWh/m² in June across the year — September's 3.18 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.8Moderate
23.8Moderate
33.7Moderate
43.7Moderate
53.6Moderate
63.6Moderate
73.6Moderate
83.5Moderate
93.5Moderate
103.4Moderate
113.4Moderate
123.3Moderate
133.3Moderate
143.3Moderate
153.2Moderate
163.1Moderate
173.1Moderate
183.1Moderate
193.0Moderate
203.0Moderate
212.9Moderate
222.9Moderate
232.8Moderate
242.8Moderate
252.7Moderate
262.7Moderate
272.6Moderate
282.6Moderate
292.5Moderate
302.5Moderate
Planning a trip in September

Is September a good time to visit Winchester?

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

5.8
Sightseeing
4th-best month of the year
2.1
Beach & pool
4th-best month of the year

September is a reasonable time to visit Winchester for sightseeing.

What to pack for Winchester in September

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

In September, Winchester sees daytime highs around 18°C and nights near 11°C. Worth packing: rain gear. About 9 days see rain.

rain gear

Sea temperature near Winchester 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 49 km away) is warmest in August at about 18°C and coldest in March near 8°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
Jan9Bracing
Feb8Bracing
Mar8Bracing
Apr9Bracing
May11Bracing
Jun14Bracing
Jul16Cool
Aug18Cool
Sep17Cool
Oct16Cool
Nov13Bracing
Dec11Bracing

UV index in Winchester 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 Winchester peaks around August 11 at about 6 (high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 21 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 11UV 6Dec 21UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr4Moderate
May6High
Jun6High
Jul6High
Aug6High
Sep4Moderate
Oct2Moderate
Nov1Low
Dec1Low
Location & terrain

Where is Winchester?

Winchester sits at 51.1°N, 1.3°W, 61 m above sea level, in United Kingdom. The nearest listed city is Bishopstoke, 11 km away.

Topography around Winchester

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

Within 3 km, the terrain around Winchester has only modest variations in elevation — a maximum elevation change of 134 m around an average of 74 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 209 m; within 80 km, significant variations in elevation — a maximum elevation change of 302 m.

The land around Winchester is covered by trees (38%), grassland (24%) and cropland (21%) within 3 km, cropland (39%), trees (29%) and grassland (27%) within 16 km, and grassland (31%), cropland (22%) and water (22%) within 80 km.

3 km
134 m
16 km
209 m
80 km
302 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Bishopstoke 11 km · Eastleigh 11 km · Romsey 15 km · Hedge End 17 km · Southampton 19 km · Totton 20 km · Andover 20 km · Hythe 24 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 Winchester (51.0651°, -1.3187°, elevation 61 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).