Newport weather in September

In September, Newport sees average daytime highs of 18°C and overnight lows near 11°C, with 63 mm of rain across 10.1 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 19°C in the first days to 16°C by the end. The sky is clear or mostly clear about 13% 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 Newport's 6th-clearest and 9th-windiest month. For the whole year in context, see Newport's year-round climate.

Daytime high
18°
4th warmest
Overnight low
11°
9th coldest
Rainfall
63 mm
10.1 wet days
Daylight
12 h 24 min
5:55 AM – 6:18 PM
Cloud cover
71%
6th clearest
Wind
15 km/h
9th windiest
Solar energy
2.95 kWh/m²
Travel score
5.5
out of 10

Newport is city in south east Wales, United Kingdom.

Air quality
Good
PM2.5 9.5 µg/m³ · 2019
Founded
1126

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 Newport reaches about 18°C in the afternoon and slips back to 11°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 15°C and 21°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)
11913
21912
31912
41912
51912
61912
71912
81812
91812
101812
111812
121812
131812
141812
151811
161811
171811
181811
191711
201711
211711
221711
231711
241711
251711
261711
271611
281611
291611
301610

How September really feels in Newport

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.

Newport 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 / 7713.40.78.11.1
Feb / 6010.50.89.61.2
Mar10° / 6010.90.511.52.1
Apr13° / 6411.20.213.63.3
May16° / 6811.8015.34.5
Jun18° / 12°6410.6016.35.6
Jul20° / 14°6311.2015.96.0
Aug20° / 14°7511.3014.45.9
Sep18° / 11°6310.1012.45.5
Oct14° / 8813.1010.43.8
Nov11° / 8413.70.18.62.2
Dec / 8613.10.57.71.3

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 13% 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 71%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13169
23169
33169
43169
53169
63169
73169
83070
93070
103070
113070
122971
132872
142872
152971
162971
172971
182971
192971
202971
212971
222872
232872
242872
252872
262971
272971
282971
292872
302872

Chance of precipitation in September

Any precipitation

Newport gets around 63 mm of rain over 10.1 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 34% 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 (%)
130
230
330
430
530
630
730
831
931
1031
1131
1231
1332
1432
1533
1633
1733
1834
1934
2035
2135
2236
2337
2437
2538
2639
2740
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 73% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
163325
263325
364315
465305
566295
666295
767285
868275
969265
1071254
1171254
1272244
1373234
1474233
1575223
1675223
1776222
1876222
1976222
2076231
2176231
2276231
2376231
2476231
2577221
2677221
2778211
2879201
2980191
3080191

Wind in September

Winds average 15 km/h in September.

Across September, daily wind ranges from about 14 km/h on the calmest days to 16 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
415light breeze
515light breeze
615light breeze
715light breeze
815light breeze
915light breeze
1015light breeze
1115light breeze
1215light breeze
1315light breeze
1415light breeze
1515light breeze
1615light breeze
1715light breeze
1815light breeze
1915light breeze
2015light breeze
2115light breeze
2215light breeze
2315light breeze
2415light breeze
2515light breeze
2616light breeze
2716light breeze
2816light breeze
2916light breeze
3016light 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 5:30 AM to 6:18 AM, and sunset from 6:54 PM to 5:45 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.45:306:54
213.35:316:51
313.35:336:49
413.25:356:47
513.15:366:44
613.15:386:42
713.05:406:40
812.95:416:37
912.95:436:35
1012.85:456:32
1112.75:466:30
1212.75:486:28
1312.65:506:25
1412.55:516:23
1512.55:536:20
1612.45:556:18
1712.35:566:16
1812.35:586:13
1912.26:006:11
2012.16:016:08
2112.16:036:06
2212.06:056:04
2311.96:066:01
2411.86:085:59
2511.86:105:56
2611.76:115:54
2711.66:135:52
2811.66:155:49
2911.56:165:47
3011.46:185:45

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 0.64 kWh/m² to a high of 5.12 kWh/m² in June across the year — September's 2.95 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.5Moderate
23.5Moderate
33.5Moderate
43.4Moderate
53.4Moderate
63.4Moderate
73.3Moderate
83.3Moderate
93.2Moderate
103.2Moderate
113.2Moderate
123.1Moderate
133.1Moderate
143.0Moderate
153.0Moderate
163.0Moderate
172.9Moderate
182.9Moderate
192.8Moderate
202.8Moderate
212.7Moderate
222.7Moderate
232.6Moderate
242.6Moderate
252.5Moderate
262.5Moderate
272.4Moderate
282.4Moderate
292.3Moderate
302.3Moderate
Planning a trip in September

Is September a good time to visit Newport?

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

5.5
Sightseeing
4th-best month of the year
1.7
Beach & pool
4th-best month of the year

September is a reasonable time to visit Newport for sightseeing.

What to pack for Newport in September

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

In September, Newport sees daytime highs around 18°C and nights near 11°C. Worth packing: rain gear. About 10 days see rain.

rain gear

Sea temperature near Newport 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 7°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
Jan8Bracing
Feb7Bracing
Mar7Bracing
Apr9Bracing
May12Bracing
Jun15Cool
Jul18Cool
Aug18Cool
Sep17Cool
Oct15Bracing
Nov12Bracing
Dec9Bracing

UV index in Newport 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 Newport peaks around August 12 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowAug 12UV 6Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr4Moderate
May6High
Jun6High
Jul6High
Aug7High
Sep4Moderate
Oct2Moderate
Nov1Low
Dec1Low
Location & terrain

Where is Newport?

Newport sits at 51.6°N, 3.0°W, 16 m above sea level, in United Kingdom. The nearest listed city is Risca, 7.0 km away.

Topography around Newport

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

Within 3 km, the terrain around Newport has only modest variations in elevation — a maximum elevation change of 106 m around an average of 28 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 472 m; within 80 km, large variations in elevation — a maximum elevation change of 864 m.

The land around Newport is covered by artificial surfaces (44%) and trees (33%) within 3 km, grassland (34%), trees (28%) and water (24%) within 16 km, and grassland (52%) within 80 km.

3 km
106 m
16 km
472 m
80 km
864 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Risca 7.0 km · Cwmbran 8.0 km · Pontypool 13 km · Caerphilly 15 km · Blackwood 17 km · Cardiff 17 km · Clevedon 19 km · Portishead 20 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 Newport (51.5877°, -2.9983°, elevation 16 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).