Lomonosov weather in September

In September, Lomonosov sees average daytime highs of 13°C and overnight lows near 10°C, with 69 mm of rain across 11.8 wet days and about 12.6 hours of daylight. It is the 4th-warmest and 4th-wettest month of the year here.

Highs ease over the month, from about 15°C in the first days to 11°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 54 min at the start of September to 11 h 12 min by month's end. Set against the rest of the year, September is Lomonosov's 6th-clearest and 7th-windiest month. For the whole year in context, see Lomonosov's year-round climate.

Daytime high
13°
4th warmest
Overnight low
10°
10th coldest
Rainfall
69 mm
11.8 wet days
Daylight
12 h 30 min
6:39 AM – 7:11 PM
Cloud cover
69%
6th clearest
Wind
18 km/h
7th windiest
Solar energy
2.54 kWh/m²
Travel score
3.3
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 15°C in the first days to 11°C by the end.

A typical September day in Lomonosov reaches about 13°C in the afternoon and slips back to 10°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 9°C and 16°C. Set against its neighbours, September runs about 4°C cooler than August and about 6°C warmer than October.

10°15°20°151015202530
Avg high (°C)Avg low (°C)
11512
21512
31512
41512
51411
61411
71411
81411
91411
101411
111311
121311
131310
141310
151310
161310
171210
181210
191210
20129
21129
22129
23119
24119
25119
26118
27118
28118
29108
30108

How September really feels in Lomonosov

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.

Lomonosov weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-3° / -6°4411.6126.40.0
Feb-4° / -7°349.49.88.70.0
Mar-1° / -4°3797.111.30.0
Apr / 389314.10.3
May11° / 477.90.216.72.7
Jun14° / 10°6410.1018.34.2
Jul18° / 14°599.2017.75.8
Aug17° / 13°7710.7015.35.3
Sep13° / 10°6911.8012.63.3
Oct / 7913.61.59.80.8
Nov / 7113.96.27.20.0
Dec-1° / -4°5513.410.45.70.0

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 19% of September, with mostly cloudy or overcast conditions the remaining 65%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13862
23862
33862
43862
53763
63763
73664
83664
93664
103664
113664
123664
133565
143565
153565
163565
173565
183565
193466
203466
213466
223466
233367
243367
253367
263268
273268
283169
293070
303070

Chance of precipitation in September

Any precipitation

Lomonosov gets around 69 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 39% and peaks near 44% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
135
234
334
434
535
635
735
836
937
1037
1138
1238
1339
1439
1539
1640
1740
1840
1940
2041
2141
2242
2342
2442
2543
2643
2743
2844
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 (%)
182162
284151
385141
486131
587121
688111
788111
889101
99091
109181
119271
129271
139361
149550
159550
169640
179640
189730
199730
209820
219820
229820
239910
249910
259910
269910
279910
289910
2910000
3010000

Wind in September

Winds average 18 km/h in September.

Across September, daily wind ranges from about 16 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
116light breeze
217light breeze
317light breeze
417light breeze
517light breeze
617light breeze
717light breeze
817light breeze
917light breeze
1018light breeze
1118light breeze
1218light breeze
1318light breeze
1418light breeze
1518light breeze
1618light breeze
1718light 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 54 min at the start of September to 11 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 162 minutes over September. Sunrise moves from 6:03 AM to 7:13 AM, and sunset from 7:58 PM to 6:27 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.96:037:58
213.86:057:55
313.76:087:52
413.66:107:49
513.66:137:46
613.56:157:43
713.46:187:40
813.36:207:36
913.26:227:33
1013.16:257:30
1113.06:277:27
1212.96:307:24
1312.86:327:21
1412.76:347:18
1512.66:377:14
1612.56:397:11
1712.46:427:08
1812.36:447:05
1912.36:467:02
2012.26:496:59
2112.16:516:55
2212.06:546:52
2311.96:566:49
2411.86:596:46
2511.77:016:43
2611.67:036:40
2711.57:066:37
2811.47:086:33
2911.37:116:30
3011.27:136:27

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 2.54 kWh/m².

For context, solar energy here swings from a low near 0.16 kWh/m² to a high of 5.81 kWh/m² in June across the year — September's 2.54 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.3Moderate
23.3Moderate
33.2Moderate
43.2Moderate
53.1Moderate
63.1Moderate
73.0Moderate
82.9Moderate
92.9Moderate
102.8Moderate
112.8Moderate
122.7Moderate
132.7Moderate
142.6Moderate
152.6Moderate
162.5Moderate
172.5Moderate
182.4Moderate
192.4Moderate
202.3Moderate
212.3Moderate
222.2Moderate
232.1Moderate
242.1Moderate
252.0Moderate
262.0Dim
271.9Dim
281.9Dim
291.8Dim
301.8Dim
Planning a trip in September

Is September a good time to visit Lomonosov?

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

3.3
Sightseeing
4th-best month of the year
0.0
Beach & pool
4th-best month of the year

September is a weaker month for outdoor sightseeing in Lomonosov.

What to pack for Lomonosov in September

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

In September, Lomonosov sees daytime highs around 13°C and nights near 10°C. Worth packing: a warm layer and rain gear. About 12 days see rain.

a warm layerrain gear

Sea temperature near Lomonosov in September

The nearest coast averages about 15°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 July at about 18°C and coldest in February near -0°C.

The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.

0°10°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°C)Comfort
Jan0Bracing
Feb0Bracing
Mar0Bracing
Apr2Bracing
May8Bracing
Jun14Bracing
Jul18Cool
Aug18Cool
Sep15Bracing
Oct10Bracing
Nov6Bracing
Dec2Bracing

UV index in Lomonosov in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 2. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Lomonosov peaks around July 12 at about 5 (high) — a little sun protection helps at midday. It bottoms out near December 17 at about 0 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 4 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJul 12UV 5Dec 17UV 0
UV index (midday)Level
Jan0Low
Feb1Low
Mar2Low
Apr3Moderate
May4Moderate
Jun5High
Jul5High
Aug4Moderate
Sep2Moderate
Oct1Low
Nov0Low
Dec0Low

Air quality in Lomonosov in September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.

Air quality in Lomonosov is worst in April — around 20 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (November, 10 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1719 µg/m³Nov 1710 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb11Good
Mar17Moderate
Apr20Moderate
May17Moderate
Jun15Moderate
Jul16Moderate
Aug16Moderate
Sep15Moderate
Oct12Good
Nov10Good
Dec11Good
Location & terrain

Where is Lomonosov?

Lomonosov sits at 59.9°N, 29.8°E, 30 m above sea level, in Russia. The nearest listed city is Petrodvorets, 2.0 km away.

Topography around Lomonosov

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

Within 3 km, the terrain around Lomonosov has only modest variations in elevation — a maximum elevation change of 61 m around an average of 24 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 115 m; within 80 km, only modest variations in elevation — a maximum elevation change of 236 m.

The land around Lomonosov is covered by trees (62%) and water (20%) within 3 km, water (44%) and trees (40%) within 16 km, and trees (61%) and water (20%) within 80 km.

3 km
61 m
16 km
115 m
80 km
236 m
treesshrubsgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Petrodvorets 2.0 km · Peterhof 8.0 km · Kronstadt 10 km · Sosnovaya Polyana 22 km · Uritsk 24 km · Sestroretsk 24 km · Gorelovo 25 km · Krasnoye Selo 26 km

Russia travel facts

Travel advisory
Level 4
Do Not Travel
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 32% of US
price level, 2025
GDP per capita
$17,547
2025
Happiness
5.8 / 10
World Happiness, 2025
Safe drinking water
76%
of population, 2024
Homicide rate
6.8
per 100k, 2021
Road deaths
12
per 100k/yr, 2019
Income group
High
World Bank
English
Moderate
EF EPI 521
Religion
other Christian 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 Lomonosov (59.9061°, 29.7725°, elevation 30 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. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).