Bonnyrigg weather in September

In September, Bonnyrigg sees average daytime highs of 15°C and overnight lows near 9°C, with 65 mm of rain across 11.8 wet days and about 12.5 hours of daylight. It is the 4th-warmest and 10th-wettest month of the year here.

Highs ease over the month, from about 16°C in the first days to 14°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 36 min at the start of September to 11 h 18 min by month's end. Set against the rest of the year, September is Bonnyrigg's 8th-clearest and 8th-windiest month. For the whole year in context, see Bonnyrigg's year-round climate.

Daytime high
15°
4th warmest
Overnight low
9th coldest
Rainfall
65 mm
11.8 wet days
Daylight
12 h 30 min
5:53 AM – 6:20 PM
Cloud cover
76%
8th clearest
Wind
15 km/h
8th windiest
Solar energy
2.63 kWh/m²
Travel score
4.1
out of 10

Bonnyrigg is town in Midlothian, Scotland, UK.

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 16°C in the first days to 14°C by the end.

A typical September day in Bonnyrigg reaches about 15°C in the afternoon and slips back to 9°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 12°C and 18°C. Set against its neighbours, September runs about 2°C cooler than August and about 4°C warmer than October.

10°15°20°151015202530
Avg high (°C)Avg low (°C)
11610
21610
31610
41610
5169
6169
7169
8169
9169
10169
11159
12159
13159
14159
15159
16159
17159
18159
19158
20158
21148
22148
23148
24148
25148
26148
27148
28148
29148
30148

How September really feels in Bonnyrigg

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.

Bonnyrigg 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 / 7714.34.47.40.2
Feb / 6612.64.49.20.4
Mar / 6313.2311.41.1
Apr10° / 6212.91.213.82.1
May13° / 67140.2163.2
Jun16° / 7914.4017.24.1
Jul18° / 11°8315.3016.74.8
Aug17° / 11°8715014.84.8
Sep15° / 6511.8012.54.1
Oct12° / 7813.40.110.12.6
Nov / 7414.4181.2
Dec / 8113.83.36.80.3

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 (%)
12575
22377
32476
42476
52476
62476
72476
82476
92476
102377
112278
122278
132278
142377
152377
162476
172476
182377
192377
202377
212476
222377
232377
242377
252476
262476
272476
282476
292476
302476

Chance of precipitation in September

Any precipitation

Bonnyrigg gets around 65 mm of rain over 11.8 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 40% and peaks near 44% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
140
240
339
439
540
640
740
840
940
1040
1140
1240
1340
1440
1540
1640
1739
1839
1939
2039
2139
2239
2340
2440
2541
2642
2743
2843
2944
3044

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 94% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
190100
290100
39190
49091
59091
69091
79091
89091
99181
109280
119370
129370
139460
149460
159460
169550
179550
189550
199640
209640
219640
229640
239730
249730
259730
269730
279730
289730
299730
309730

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
2615light breeze
2715light breeze
2815light breeze
2916light breeze
3016light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 36 min at the start of September to 11 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 138 minutes over September. Sunrise moves from 5:23 AM to 6:21 AM, and sunset from 7:01 PM to 5:42 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.65:237:01
213.65:256:59
313.55:276:56
413.45:296:53
513.35:316:50
613.25:336:48
713.25:356:45
813.15:376:42
913.05:396:40
1012.95:416:37
1112.95:436:34
1212.85:456:31
1312.75:476:29
1412.65:496:26
1512.55:516:23
1612.55:536:20
1712.45:556:18
1812.35:576:15
1912.25:596:12
2012.16:016:09
2112.16:036:07
2212.06:056:04
2311.96:076:01
2411.86:095:58
2511.76:115:56
2611.76:135:53
2711.66:155:50
2811.56:175:48
2911.46:195:45
3011.36:215:42

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 2.63 kWh/m².

For context, solar energy here swings from a low near 0.41 kWh/m² to a high of 4.83 kWh/m² in May across the year — September's 2.63 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.2Moderate
23.2Moderate
33.1Moderate
43.1Moderate
53.1Moderate
63.0Moderate
73.0Moderate
83.0Moderate
92.9Moderate
102.9Moderate
112.8Moderate
122.8Moderate
132.8Moderate
142.7Moderate
152.7Moderate
162.6Moderate
172.6Moderate
182.5Moderate
192.5Moderate
202.5Moderate
212.4Moderate
222.4Moderate
232.3Moderate
242.3Moderate
252.3Moderate
262.2Moderate
272.2Moderate
282.1Moderate
292.1Moderate
302.1Moderate
Planning a trip in September

Is September a good time to visit Bonnyrigg?

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

4.1
Sightseeing
3rd-best month of the year
0.2
Beach & pool
4th-best month of the year

September is a reasonable time to visit Bonnyrigg for sightseeing.

What to pack for Bonnyrigg in September

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

In September, Bonnyrigg sees daytime highs around 15°C and nights near 9°C. Worth packing: a warm layer and rain gear. About 12 days see rain.

a warm layerrain gear

Sea temperature near Bonnyrigg in September

The nearest coast averages about 13°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 28 km away) is warmest in August at about 14°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°JanFebMarAprMayJunJulAugSepOctNovDecbracingcool
Sea temperature (°C)Comfort
Jan7Bracing
Feb6Bracing
Mar6Bracing
Apr7Bracing
May10Bracing
Jun12Bracing
Jul14Bracing
Aug14Bracing
Sep13Bracing
Oct12Bracing
Nov10Bracing
Dec8Bracing

UV index in Bonnyrigg in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 3 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Bonnyrigg peaks around June 20 at about 5 (high) — a little sun protection helps at midday. It bottoms out near December 20 at about 0 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 5 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJun 20UV 5Dec 20UV 0
UV index (midday)Level
Jan0Low
Feb1Low
Mar2Moderate
Apr3Moderate
May5Moderate
Jun5High
Jul5High
Aug5Moderate
Sep3Moderate
Oct2Low
Nov1Low
Dec0Low
Location & terrain

Where is Bonnyrigg?

Bonnyrigg sits at 55.9°N, 3.1°W, 103 m above sea level, in United Kingdom. The nearest listed city is Musselburgh, 8.0 km away.

Topography around Bonnyrigg

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

Within 3 km, the terrain around Bonnyrigg has only modest variations in elevation — a maximum elevation change of 121 m around an average of 100 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 609 m; within 80 km, large variations in elevation — a maximum elevation change of 851 m.

The land around Bonnyrigg is covered by trees (33%), grassland (27%) and cropland (21%) within 3 km, grassland (44%) within 16 km, and grassland (49%) within 80 km.

3 km
121 m
16 km
609 m
80 km
851 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Musselburgh 8.0 km · Penicuik 9.0 km · Edinburgh 10 km · Broxburn 24 km · Livingston 26 km · Kirkcaldy 27 km · Dunfermline 31 km · Bathgate 34 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 Bonnyrigg (55.8733°, -3.1051°, elevation 103 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).