Bacău weather in September

In September, Bacău sees average daytime highs of 22°C and overnight lows near 11°C, with 46 mm of rain across 6.4 wet days and about 12.4 hours of daylight. It is the 4th-warmest and 5th-wettest month of the year here.

Highs ease over the month, from about 24°C in the first days to 19°C by the end. The sky is clear or mostly clear about 37% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 12 min at the start of September to 11 h 30 min by month's end. Set against the rest of the year, September is Bacău's 3rd-clearest and 7th-windiest month. For the whole year in context, see Bacău's year-round climate.

Daytime high: 22°; 4th warmest
Overnight low: 11°; 9th coldest
Rainfall: 46 mm; 6.4 wet days
Daylight: 12 h 18 min; 5:57 AM – 6:16 PM
Cloud cover: 53%; 3rd clearest
Wind: 9 km/h; 7th windiest
Solar energy: 3.77 kWh/m²
Travel score: 7.3; out of 10

Bacău is locality in Bacău County, Romania.

Air quality: Moderate; PM2.5 12.9 µg/m³ · 2010

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

← August Bacău year-round climate October →Best places to visit in September

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 24°C in the first days to 19°C by the end.

A typical September day in Bacău reaches about 22°C in the afternoon and slips back to 11°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 16°C and 28°C. Set against its neighbours, September runs about 5°C cooler than August and about 6°C warmer than October.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Avg high (°C)	25	25	24	24	24	24	24	23	23	23	23	23	23	22	22	22	22	22	21	21	21	21	20	20	20	20	20	19	19	19
Avg low (°C)	14	14	13	13	13	13	13	13	12	12	12	12	12	12	11	11	11	11	11	11	11	10	10	10	10	10	10	9	9	9

	Avg high (°C)	Avg low (°C)
1	25	14
2	25	14
3	24	13
4	24	13
5	24	13
6	24	13
7	24	13
8	23	13
9	23	12
10	23	12
11	23	12
12	23	12
13	23	12
14	22	12
15	22	11
16	22	11
17	22	11
18	22	11
19	21	11
20	21	11
21	21	11
22	21	10
23	20	10
24	20	10
25	20	10
26	20	10
27	20	10
28	19	9
29	19	9
30	19	9

How September really feels in Bacău

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

heat index over the day's high

Days feeling ≤ 0°C

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.

Bacău weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 5th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Snow days	Daylight (hours)	Travel score
Jan	1° / -5°	30	5.8	5.4	8.8	0.0
Feb	4° / -4°	28	6.3	4.6	10	0.1
Mar	9° / 0°	39	8.1	2.7	11.6	2.0
Apr	16° / 6°	48	9	0.4	13.3	5.0
May	22° / 11°	64	10.1	0	14.8	6.6
Jun	25° / 15°	81	10.3	0	15.6	6.8
Jul	27° / 16°	70	8.7	0	15.2	6.8
Aug	27° / 16°	44	6.3	0	14	7.2
Sep	22° / 11°	46	6.4	0	12.4	7.3
Oct	15° / 6°	44	6	0.1	10.7	5.2
Nov	8° / 1°	35	5.7	2	9.2	1.6
Dec	2° / -4°	36	6.7	4.4	8.4	0.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 37% 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 45%. Skies tend to cloud over as the month goes on.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Clearer (%)	62	62	61	61	61	60	60	60	60	60	59	59	58	58	57	57	55	55	54	53	52	51	50	49	49	49	48	47	47	47
Cloudier (%)	38	38	39	39	39	40	40	40	40	40	41	41	42	42	43	43	45	45	46	47	48	49	50	51	51	51	52	53	53	53

	Clearer (%)	Cloudier (%)
1	62	38
2	62	38
3	61	39
4	61	39
5	61	39
6	60	40
7	60	40
8	60	40
9	60	40
10	60	40
11	59	41
12	59	41
13	58	42
14	58	42
15	57	43
16	57	43
17	55	45
18	55	45
19	54	46
20	53	47
21	52	48
22	51	49
23	50	50
24	49	51
25	49	51
26	49	51
27	48	52
28	47	53
29	47	53
30	47	53

Chance of precipitation in September

Any precipitation

Bacău gets around 46 mm of rain over 6.4 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 21% and peaks near 22% on the wettest days.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Rain chance (%)	22	22	22	21	21	21	21	21	20	20	20	20	20	21	21	21	21	21	21	21	21	21	21	21	21	21	20	20	20	20

	Rain chance (%)
1	22
2	22
3	22
4	21
5	21
6	21
7	21
8	21
9	20
10	20
11	20
12	20
13	20
14	21
15	21
16	21
17	21
18	21
19	21
20	21
21	21
22	21
23	21
24	21
25	21
26	21
27	20
28	20
29	20
30	20

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 77% of days. It rarely turns muggy — the humid and sticky bands barely register.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Dry (%)	60	62	64	66	68	70	71	73	73	75	76	76	77	78	79	80	80	81	81	82	83	83	84	84	84	85	85	85	85	85
Comfortable (%)	29	28	27	26	25	24	23	22	22	21	20	20	19	19	18	17	17	16	16	15	14	14	13	13	13	12	12	12	12	12
Humid (%)	11	10	9	8	7	6	6	5	5	4	4	4	4	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3

	Dry (%)	Comfortable (%)	Humid (%)
1	60	29	11
2	62	28	10
3	64	27	9
4	66	26	8
5	68	25	7
6	70	24	6
7	71	23	6
8	73	22	5
9	73	22	5
10	75	21	4
11	76	20	4
12	76	20	4
13	77	19	4
14	78	19	3
15	79	18	3
16	80	17	3
17	80	17	3
18	81	16	3
19	81	16	3
20	82	15	3
21	83	14	3
22	83	14	3
23	84	13	3
24	84	13	3
25	84	13	3
26	85	12	3
27	85	12	3
28	85	12	3
29	85	12	3
30	85	12	3

Wind in September

Winds average 9 km/h in September.

Across September, daily wind ranges from about 9 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Wind speed (km/h)	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9
Feels	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm

	Wind speed (km/h)	Feels
1	9	calm
2	9	calm
3	9	calm
4	9	calm
5	9	calm
6	9	calm
7	9	calm
8	9	calm
9	9	calm
10	9	calm
11	9	calm
12	9	calm
13	9	calm
14	9	calm
15	9	calm
16	9	calm
17	9	calm
18	9	calm
19	9	calm
20	9	calm
21	9	calm
22	9	calm
23	9	calm
24	9	calm
25	9	calm
26	9	calm
27	9	calm
28	9	calm
29	9	calm
30	9	calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 12 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 102 minutes over September. Sunrise moves from 5:37 AM to 6:16 AM, and sunset from 6:47 PM to 5:48 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Daylight (h)	13.2	13.1	13.1	13.0	12.9	12.9	12.8	12.8	12.7	12.7	12.6	12.6	12.5	12.4	12.4	12.3	12.3	12.2	12.2	12.1	12.0	12.0	11.9	11.9	11.8	11.8	11.7	11.6	11.6	11.5
Sunrise (AM)	5:37	5:38	5:40	5:41	5:42	5:44	5:45	5:46	5:48	5:49	5:50	5:52	5:53	5:54	5:56	5:57	5:58	6:00	6:01	6:02	6:04	6:05	6:06	6:08	6:09	6:10	6:12	6:13	6:14	6:16
Sunset (PM)	6:47	6:45	6:43	6:41	6:39	6:37	6:35	6:33	6:31	6:29	6:27	6:25	6:23	6:21	6:19	6:16	6:14	6:12	6:10	6:08	6:06	6:04	6:02	6:00	5:58	5:56	5:54	5:52	5:50	5:48

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	13.2	5:37	6:47
2	13.1	5:38	6:45
3	13.1	5:40	6:43
4	13.0	5:41	6:41
5	12.9	5:42	6:39
6	12.9	5:44	6:37
7	12.8	5:45	6:35
8	12.8	5:46	6:33
9	12.7	5:48	6:31
10	12.7	5:49	6:29
11	12.6	5:50	6:27
12	12.6	5:52	6:25
13	12.5	5:53	6:23
14	12.4	5:54	6:21
15	12.4	5:56	6:19
16	12.3	5:57	6:16
17	12.3	5:58	6:14
18	12.2	6:00	6:12
19	12.2	6:01	6:10
20	12.1	6:02	6:08
21	12.0	6:04	6:06
22	12.0	6:05	6:04
23	11.9	6:06	6:02
24	11.9	6:08	6:00
25	11.8	6:09	5:58
26	11.8	6:10	5:56
27	11.7	6:12	5:54
28	11.6	6:13	5:52
29	11.6	6:14	5:50
30	11.5	6:16	5:48

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.77 kWh/m².

For context, solar energy here swings from a low near 1.09 kWh/m² to a high of 5.86 kWh/m² in June across the year — September's 3.77 kWh/m² falls in the middle.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Solar energy (kWh/m²)	4.5	4.5	4.4	4.4	4.3	4.3	4.2	4.2	4.1	4.1	4.0	4.0	3.9	3.9	3.8	3.8	3.7	3.6	3.6	3.5	3.5	3.4	3.4	3.3	3.3	3.2	3.2	3.1	3.1	3.0
Level	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate

	Solar energy (kWh/m²)	Level
1	4.5	Bright
2	4.5	Bright
3	4.4	Bright
4	4.4	Bright
5	4.3	Bright
6	4.3	Bright
7	4.2	Bright
8	4.2	Bright
9	4.1	Bright
10	4.1	Bright
11	4.0	Bright
12	4.0	Moderate
13	3.9	Moderate
14	3.9	Moderate
15	3.8	Moderate
16	3.8	Moderate
17	3.7	Moderate
18	3.6	Moderate
19	3.6	Moderate
20	3.5	Moderate
21	3.5	Moderate
22	3.4	Moderate
23	3.4	Moderate
24	3.3	Moderate
25	3.3	Moderate
26	3.2	Moderate
27	3.2	Moderate
28	3.1	Moderate
29	3.1	Moderate
30	3.0	Moderate

Planning a trip in September

Is September a good time to visit Bacău?

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

7.3

Sightseeing

1st-best month of the year

5.0

Beach & pool

4th-best month of the year

September is one of the better times to visit Bacău for general sightseeing.

What to pack for Bacău in September

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

In September, Bacău sees daytime highs around 22°C and nights near 11°C. Little to plan around — just the basics. About 6 days see rain.

UV index in Bacău in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Bacău peaks around July 17 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 7 months of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	1	2	3	7	6	8	8	8	5	3	1	1
Level	Low	Low	Moderate	High	High	Very high	Very high	Very high	High	Moderate	Low	Low

	UV index (midday)	Level
Jan	1	Low
Feb	2	Low
Mar	3	Moderate
Apr	7	High
May	6	High
Jun	8	Very high
Jul	8	Very high
Aug	8	Very high
Sep	5	High
Oct	3	Moderate
Nov	1	Low
Dec	1	Low

Air quality in Bacău 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 Bacău is worst in July — around 16 µg/m³ PM2.5 (moderate), about 1.7× the cleanest month (December, 9 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Bacău's WHO annual average of 12.9 µg/m³.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
PM2.5 (µg/m³)	12	12	16	14	14	15	16	14	12	10	11	9
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Good	Good	Good	Good

	PM2.5 (µg/m³)	Level
Jan	12	Moderate
Feb	12	Moderate
Mar	16	Moderate
Apr	14	Moderate
May	14	Moderate
Jun	15	Moderate
Jul	16	Moderate
Aug	14	Moderate
Sep	12	Good
Oct	10	Good
Nov	11	Good
Dec	9	Good

Location & terrain

Where is Bacău?

Bacău sits at 46.6°N, 26.9°E, 165 m above sea level, in Romania. The nearest listed city is Buhuşi, 23 km away.

Topography around Bacău

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

Within 3 km, the terrain around Bacău has only modest variations in elevation — a maximum elevation change of 82 m around an average of 167 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 591 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,614 m.

The land around Bacău is covered by artificial surfaces (43%) within 3 km, trees (38%), cropland (33%) and grassland (21%) within 16 km, and trees (45%), cropland (32%) and grassland (21%) within 80 km.

3 km

82 m

artificial surfaces 43%

16 km

591 m

trees 38%

80 km

1,614 m

trees 45%

treesgrasslandcroplandartificial surfaceswaterwetland

← August Bacău year-round climate October →Best places to visit in September

September weather nearby: Buhuşi 23 km · Moineşti 34 km · Roman 39 km · Comăneşti 40 km · Adjud 56 km · Piatra Neamţ 59 km · Vaslui 63 km · Bârlad 69 km

Romania travel facts

Travel advisory: Level 1; Exercise Normal Precautions
Power plugs: Type C / F; 230 V · 50 Hz
Prices: ≈ 44% of US; price level, 2025
GDP per capita: $22,538; 2025
Happiness: 6.6 / 10; World Happiness, 2025
Safe drinking water: 82%; of population, 2024
Homicide rate: 1.1; per 100k, 2023
Road deaths: 10.3; per 100k/yr, 2019
Income group: High; World Bank
English: Very high; EF EPI 605
Religion

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 Bacău (46.5672°, 26.9138°, elevation 165 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. 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).

	Avg high (°C)	Avg low (°C)
1	25	14
2	25	14
3	24	13
4	24	13
5	24	13
6	24	13
7	24	13
8	23	13
9	23	12
10	23	12
11	23	12
12	23	12
13	23	12
14	22	12
15	22	11
16	22	11
17	22	11
18	22	11
19	21	11
20	21	11
21	21	11
22	21	10
23	20	10
24	20	10
25	20	10
26	20	10
27	20	10
28	19	9
29	19	9
30	19	9

	Clearer (%)	Cloudier (%)
1	62	38
2	62	38
3	61	39
4	61	39
5	61	39
6	60	40
7	60	40
8	60	40
9	60	40
10	60	40
11	59	41
12	59	41
13	58	42
14	58	42
15	57	43
16	57	43
17	55	45
18	55	45
19	54	46
20	53	47
21	52	48
22	51	49
23	50	50
24	49	51
25	49	51
26	49	51
27	48	52
28	47	53
29	47	53
30	47	53

	Rain chance (%)
1	22
2	22
3	22
4	21
5	21
6	21
7	21
8	21
9	20
10	20
11	20
12	20
13	20
14	21
15	21
16	21
17	21
18	21
19	21
20	21
21	21
22	21
23	21
24	21
25	21
26	21
27	20
28	20
29	20
30	20

	Dry (%)	Comfortable (%)	Humid (%)
1	60	29	11
2	62	28	10
3	64	27	9
4	66	26	8
5	68	25	7
6	70	24	6
7	71	23	6
8	73	22	5
9	73	22	5
10	75	21	4
11	76	20	4
12	76	20	4
13	77	19	4
14	78	19	3
15	79	18	3
16	80	17	3
17	80	17	3
18	81	16	3
19	81	16	3
20	82	15	3
21	83	14	3
22	83	14	3
23	84	13	3
24	84	13	3
25	84	13	3
26	85	12	3
27	85	12	3
28	85	12	3
29	85	12	3
30	85	12	3

	Avg high (°C)	Avg low (°C)
1	25	14
2	25	14
3	24	13
4	24	13
5	24	13
6	24	13
7	24	13
8	23	13
9	23	12
10	23	12
11	23	12
12	23	12
13	23	12
14	22	12
15	22	11
16	22	11
17	22	11
18	22	11
19	21	11
20	21	11
21	21	11
22	21	10
23	20	10
24	20	10
25	20	10
26	20	10
27	20	10
28	19	9
29	19	9
30	19	9

	Clearer (%)	Cloudier (%)
1	62	38
2	62	38
3	61	39
4	61	39
5	61	39
6	60	40
7	60	40
8	60	40
9	60	40
10	60	40
11	59	41
12	59	41
13	58	42
14	58	42
15	57	43
16	57	43
17	55	45
18	55	45
19	54	46
20	53	47
21	52	48
22	51	49
23	50	50
24	49	51
25	49	51
26	49	51
27	48	52
28	47	53
29	47	53
30	47	53

	Rain chance (%)
1	22
2	22
3	22
4	21
5	21
6	21
7	21
8	21
9	20
10	20
11	20
12	20
13	20
14	21
15	21
16	21
17	21
18	21
19	21
20	21
21	21
22	21
23	21
24	21
25	21
26	21
27	20
28	20
29	20
30	20

	Dry (%)	Comfortable (%)	Humid (%)
1	60	29	11
2	62	28	10
3	64	27	9
4	66	26	8
5	68	25	7
6	70	24	6
7	71	23	6
8	73	22	5
9	73	22	5
10	75	21	4
11	76	20	4
12	76	20	4
13	77	19	4
14	78	19	3
15	79	18	3
16	80	17	3
17	80	17	3
18	81	16	3
19	81	16	3
20	82	15	3
21	83	14	3
22	83	14	3
23	84	13	3
24	84	13	3
25	84	13	3
26	85	12	3
27	85	12	3
28	85	12	3
29	85	12	3
30	85	12	3

	Avg high (°C)	Avg low (°C)
1	25	14
2	25	14
3	24	13
4	24	13
5	24	13
6	24	13
7	24	13
8	23	13
9	23	12
10	23	12
11	23	12
12	23	12
13	23	12
14	22	12
15	22	11
16	22	11
17	22	11
18	22	11
19	21	11
20	21	11
21	21	11
22	21	10
23	20	10
24	20	10
25	20	10
26	20	10
27	20	10
28	19	9
29	19	9
30	19	9

	Clearer (%)	Cloudier (%)
1	62	38
2	62	38
3	61	39
4	61	39
5	61	39
6	60	40
7	60	40
8	60	40
9	60	40
10	60	40
11	59	41
12	59	41
13	58	42
14	58	42
15	57	43
16	57	43
17	55	45
18	55	45
19	54	46
20	53	47
21	52	48
22	51	49
23	50	50
24	49	51
25	49	51
26	49	51
27	48	52
28	47	53
29	47	53
30	47	53

	Rain chance (%)
1	22
2	22
3	22
4	21
5	21
6	21
7	21
8	21
9	20
10	20
11	20
12	20
13	20
14	21
15	21
16	21
17	21
18	21
19	21
20	21
21	21
22	21
23	21
24	21
25	21
26	21
27	20
28	20
29	20
30	20

	Dry (%)	Comfortable (%)	Humid (%)
1	60	29	11
2	62	28	10
3	64	27	9
4	66	26	8
5	68	25	7
6	70	24	6
7	71	23	6
8	73	22	5
9	73	22	5
10	75	21	4
11	76	20	4
12	76	20	4
13	77	19	4
14	78	19	3
15	79	18	3
16	80	17	3
17	80	17	3
18	81	16	3
19	81	16	3
20	82	15	3
21	83	14	3
22	83	14	3
23	84	13	3
24	84	13	3
25	84	13	3
26	85	12	3
27	85	12	3
28	85	12	3
29	85	12	3
30	85	12	3