Allerød weather in September

In September, Allerød sees average daytime highs of 17°C and overnight lows near 10°C, with 57 mm of rain across 10.1 wet days and about 12.5 hours of daylight. It is the 4th-warmest and 5th-wettest month of the year here.

Highs ease over the month, from about 19°C in the first days to 15°C by the end. The sky is clear or mostly clear about 18% 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 Allerød's 6th-clearest and 7th-windiest month. For the whole year in context, see Allerød's year-round climate.

Daytime high: 17°; 4th warmest
Overnight low: 10°; 9th coldest
Rainfall: 57 mm; 10.1 wet days
Daylight: 12 h 30 min; 5:51 AM – 6:19 PM
Cloud cover: 67%; 6th clearest
Wind: 16 km/h; 7th windiest
Solar energy: 2.84 kWh/m²
Travel score: 5.3; out of 10

← August Allerød 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 19°C in the first days to 15°C by the end.

A typical September day in Allerød reaches about 17°C in the afternoon and slips back to 10°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 14°C and 21°C. Set against its neighbours, September runs about 4°C cooler than August and about 5°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)	19	19	19	19	19	18	18	18	18	18	18	18	17	17	17	17	17	17	17	16	16	16	16	16	16	16	15	15	15	15
Avg low (°C)	12	12	11	11	11	11	11	11	11	11	11	11	10	10	10	10	10	10	10	10	10	9	9	9	9	9	9	9	9	9

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

How September really feels in Allerød

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.

Allerød 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	3° / -1°	48	11.3	4	7.4	0.0
Feb	3° / -1°	39	9.4	4.4	9.2	0.0
Mar	6° / 0°	42	9.8	2.4	11.4	0.6
Apr	11° / 3°	41	9.5	0.4	13.8	2.8
May	16° / 7°	54	10.8	0	16	4.9
Jun	19° / 11°	71	11.5	0	17.2	5.8
Jul	21° / 13°	73	12.1	0	16.7	6.2
Aug	21° / 13°	75	12.7	0	14.8	6.1
Sep	17° / 10°	57	10.1	0	12.5	5.3
Oct	12° / 7°	58	11.4	0	10.1	3.0
Nov	7° / 3°	47	10.7	0.9	8	0.9
Dec	4° / 0°	50	11.4	2.8	6.8	0.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 18% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 20% of September, with mostly cloudy or overcast conditions the remaining 62%.

	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 (%)	41	42	42	41	42	42	41	41	41	41	41	40	40	39	38	37	37	36	36	36	35	35	34	34	34	34	34	34	34	34
Cloudier (%)	59	58	58	59	58	58	59	59	59	59	59	60	60	61	62	63	63	64	64	64	65	65	66	66	66	66	66	66	66	66

	Clearer (%)	Cloudier (%)
1	41	59
2	42	58
3	42	58
4	41	59
5	42	58
6	42	58
7	41	59
8	41	59
9	41	59
10	41	59
11	41	59
12	40	60
13	40	60
14	39	61
15	38	62
16	37	63
17	37	63
18	36	64
19	36	64
20	36	64
21	35	65
22	35	65
23	34	66
24	34	66
25	34	66
26	34	66
27	34	66
28	34	66
29	34	66
30	34	66

Chance of precipitation in September

Any precipitation

Allerød gets around 57 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 38% 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 (%)	38	38	38	37	37	37	36	36	36	35	35	34	34	34	34	33	33	33	32	32	32	32	32	32	33	33	34	34	34	34

	Rain chance (%)
1	38
2	38
3	38
4	37
5	37
6	37
7	36
8	36
9	36
10	35
11	35
12	34
13	34
14	34
15	34
16	33
17	33
18	33
19	32
20	32
21	32
22	32
23	32
24	32
25	33
26	33
27	34
28	34
29	34
30	34

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 82% 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 (%)	66	68	68	70	71	73	73	74	76	77	78	79	80	81	82	83	86	86	87	88	89	89	90	90	91	91	92	92	92	93
Comfortable (%)	29	28	28	27	26	25	25	24	23	22	21	20	19	18	17	16	14	14	13	12	11	11	10	10	9	9	8	8	8	7
Humid (%)	5	4	4	3	3	2	2	2	1	1	1	1	1	1	1	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0

	Dry (%)	Comfortable (%)	Humid (%)
1	66	29	5
2	68	28	4
3	68	28	4
4	70	27	3
5	71	26	3
6	73	25	2
7	73	25	2
8	74	24	2
9	76	23	1
10	77	22	1
11	78	21	1
12	79	20	1
13	80	19	1
14	81	18	1
15	82	17	1
16	83	16	1
17	86	14	0
18	86	14	0
19	87	13	0
20	88	12	0
21	89	11	0
22	89	11	0
23	90	10	0
24	90	10	0
25	91	9	0
26	91	9	0
27	92	8	0
28	92	8	0
29	92	8	0
30	93	7	0

Wind in September

Winds average 16 km/h in September.

Across September, daily wind ranges from about 15 km/h on the calmest days to 16 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)	15	15	15	15	15	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16
Feels	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze

	Wind speed (km/h)	Feels
1	15	light breeze
2	15	light breeze
3	15	light breeze
4	15	light breeze
5	15	light breeze
6	16	light breeze
7	16	light breeze
8	16	light breeze
9	16	light breeze
10	16	light breeze
11	16	light breeze
12	16	light breeze
13	16	light breeze
14	16	light breeze
15	16	light breeze
16	16	light breeze
17	16	light breeze
18	16	light breeze
19	16	light breeze
20	16	light breeze
21	16	light breeze
22	16	light breeze
23	16	light breeze
24	16	light breeze
25	16	light breeze
26	16	light breeze
27	16	light breeze
28	16	light breeze
29	16	light breeze
30	16	light 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 5:21 AM to 6:20 AM, and sunset from 6:59 PM to 5:40 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)	13.6	13.6	13.5	13.4	13.3	13.2	13.2	13.1	13.0	12.9	12.9	12.8	12.7	12.6	12.5	12.5	12.4	12.3	12.2	12.1	12.1	12.0	11.9	11.8	11.7	11.7	11.6	11.5	11.4	11.3
Sunrise (AM)	5:21	5:23	5:25	5:27	5:29	5:31	5:33	5:35	5:37	5:39	5:41	5:43	5:45	5:47	5:49	5:51	5:53	5:55	5:57	5:59	6:01	6:03	6:05	6:07	6:09	6:11	6:13	6:15	6:17	6:20
Sunset (PM)	6:59	6:57	6:54	6:51	6:49	6:46	6:43	6:40	6:38	6:35	6:32	6:30	6:27	6:24	6:21	6:19	6:16	6:13	6:10	6:08	6:05	6:02	5:59	5:57	5:54	5:51	5:48	5:46	5:43	5:40

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	13.6	5:21	6:59
2	13.6	5:23	6:57
3	13.5	5:25	6:54
4	13.4	5:27	6:51
5	13.3	5:29	6:49
6	13.2	5:31	6:46
7	13.2	5:33	6:43
8	13.1	5:35	6:40
9	13.0	5:37	6:38
10	12.9	5:39	6:35
11	12.9	5:41	6:32
12	12.8	5:43	6:30
13	12.7	5:45	6:27
14	12.6	5:47	6:24
15	12.5	5:49	6:21
16	12.5	5:51	6:19
17	12.4	5:53	6:16
18	12.3	5:55	6:13
19	12.2	5:57	6:10
20	12.1	5:59	6:08
21	12.1	6:01	6:05
22	12.0	6:03	6:02
23	11.9	6:05	5:59
24	11.8	6:07	5:57
25	11.7	6:09	5:54
26	11.7	6:11	5:51
27	11.6	6:13	5:48
28	11.5	6:15	5:46
29	11.4	6:17	5:43
30	11.3	6:20	5:40

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 2.84 kWh/m².

For context, solar energy here swings from a low near 0.37 kWh/m² to a high of 5.65 kWh/m² in June across the year — September's 2.84 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)	3.5	3.5	3.5	3.4	3.4	3.3	3.3	3.2	3.1	3.1	3.0	3.0	2.9	2.9	2.8	2.8	2.7	2.7	2.6	2.6	2.5	2.5	2.5	2.4	2.4	2.3	2.3	2.2	2.2	2.1
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	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	3.5	Moderate
2	3.5	Moderate
3	3.5	Moderate
4	3.4	Moderate
5	3.4	Moderate
6	3.3	Moderate
7	3.3	Moderate
8	3.2	Moderate
9	3.1	Moderate
10	3.1	Moderate
11	3.0	Moderate
12	3.0	Moderate
13	2.9	Moderate
14	2.9	Moderate
15	2.8	Moderate
16	2.8	Moderate
17	2.7	Moderate
18	2.7	Moderate
19	2.6	Moderate
20	2.6	Moderate
21	2.5	Moderate
22	2.5	Moderate
23	2.5	Moderate
24	2.4	Moderate
25	2.4	Moderate
26	2.3	Moderate
27	2.3	Moderate
28	2.2	Moderate
29	2.2	Moderate
30	2.1	Moderate

Planning a trip in September

Is September a good time to visit Allerød?

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

5.3

Sightseeing

4th-best month of the year

1.3

Beach & pool

4th-best month of the year

September is a reasonable time to visit Allerød for sightseeing.

What to pack for Allerød in September

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

In September, Allerød sees daytime highs around 17°C and nights near 10°C. Worth packing: rain gear. About 10 days see rain.

rain gear

Sea temperature near Allerød 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 17 km away) is warmest in August at about 18°C and coldest in February near 2°C.

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sea temperature (°C)	3	2	3	6	10	14	17	18	15	12	8	5
Comfort	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Cool	Cool	Cool	Bracing	Bracing	Bracing

	Sea temperature (°C)	Comfort
Jan	3	Bracing
Feb	2	Bracing
Mar	3	Bracing
Apr	6	Bracing
May	10	Bracing
Jun	14	Bracing
Jul	17	Cool
Aug	18	Cool
Sep	15	Cool
Oct	12	Bracing
Nov	8	Bracing
Dec	5	Bracing

UV index in Allerød 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 Allerød peaks around July 12 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 6 months of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	0	1	2	3	5	5	5	5	3	2	1	0
Level	Low	Low	Moderate	Moderate	Moderate	High	High	Moderate	Moderate	Low	Low	Low

	UV index (midday)	Level
Jan	0	Low
Feb	1	Low
Mar	2	Moderate
Apr	3	Moderate
May	5	Moderate
Jun	5	High
Jul	5	High
Aug	5	Moderate
Sep	3	Moderate
Oct	2	Low
Nov	1	Low
Dec	0	Low

Location & terrain

Where is Allerød?

Allerød sits at 55.9°N, 12.4°E, 48 m above sea level, in Denmark. The nearest listed city is Lillerød, 1.0 km away.

Topography around Allerød

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

Within 3 km, the terrain around Allerød has only modest variations in elevation — a maximum elevation change of 66 m around an average of 52 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 110 m; within 80 km, significant variations in elevation — a maximum elevation change of 286 m.

The land around Allerød is covered by trees (52%) and grassland (24%) within 3 km, trees (37%) and grassland (25%) within 16 km, and water (45%) and cropland (23%) within 80 km.

3 km

66 m

trees 52%

16 km

110 m

trees 37%

80 km

286 m

water 45%

treesgrasslandcroplandartificial surfaceswater

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

September weather nearby: Lillerød 1.0 km · Birkerød 5.0 km · Farum 7.0 km · Hillerød 7.0 km · Hørsholm 9.0 km · Stenløse 15 km · Ballerup 15 km · Frederikssund 18 km

Denmark travel facts

Travel advisory: Level 2; Exercise Increased Caution
Power plugs: Type C / E / F / K; 230 V · 50 Hz
Prices: ≈ 92% of US; price level, 2025
GDP per capita: $76,970; 2025
Happiness: 7.5 / 10; World Happiness, 2025
Safe drinking water: 100%; of population, 2024
Homicide rate: 0.8; per 100k, 2023
Road deaths: 3.7; per 100k/yr, 2019
Income group: High; World Bank
English: Very high; EF EPI 611
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 Allerød (55.8704°, 12.3574°, elevation 48 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).

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

	Clearer (%)	Cloudier (%)
1	41	59
2	42	58
3	42	58
4	41	59
5	42	58
6	42	58
7	41	59
8	41	59
9	41	59
10	41	59
11	41	59
12	40	60
13	40	60
14	39	61
15	38	62
16	37	63
17	37	63
18	36	64
19	36	64
20	36	64
21	35	65
22	35	65
23	34	66
24	34	66
25	34	66
26	34	66
27	34	66
28	34	66
29	34	66
30	34	66

	Rain chance (%)
1	38
2	38
3	38
4	37
5	37
6	37
7	36
8	36
9	36
10	35
11	35
12	34
13	34
14	34
15	34
16	33
17	33
18	33
19	32
20	32
21	32
22	32
23	32
24	32
25	33
26	33
27	34
28	34
29	34
30	34

	Dry (%)	Comfortable (%)	Humid (%)
1	66	29	5
2	68	28	4
3	68	28	4
4	70	27	3
5	71	26	3
6	73	25	2
7	73	25	2
8	74	24	2
9	76	23	1
10	77	22	1
11	78	21	1
12	79	20	1
13	80	19	1
14	81	18	1
15	82	17	1
16	83	16	1
17	86	14	0
18	86	14	0
19	87	13	0
20	88	12	0
21	89	11	0
22	89	11	0
23	90	10	0
24	90	10	0
25	91	9	0
26	91	9	0
27	92	8	0
28	92	8	0
29	92	8	0
30	93	7	0

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

	Clearer (%)	Cloudier (%)
1	41	59
2	42	58
3	42	58
4	41	59
5	42	58
6	42	58
7	41	59
8	41	59
9	41	59
10	41	59
11	41	59
12	40	60
13	40	60
14	39	61
15	38	62
16	37	63
17	37	63
18	36	64
19	36	64
20	36	64
21	35	65
22	35	65
23	34	66
24	34	66
25	34	66
26	34	66
27	34	66
28	34	66
29	34	66
30	34	66

	Rain chance (%)
1	38
2	38
3	38
4	37
5	37
6	37
7	36
8	36
9	36
10	35
11	35
12	34
13	34
14	34
15	34
16	33
17	33
18	33
19	32
20	32
21	32
22	32
23	32
24	32
25	33
26	33
27	34
28	34
29	34
30	34

	Dry (%)	Comfortable (%)	Humid (%)
1	66	29	5
2	68	28	4
3	68	28	4
4	70	27	3
5	71	26	3
6	73	25	2
7	73	25	2
8	74	24	2
9	76	23	1
10	77	22	1
11	78	21	1
12	79	20	1
13	80	19	1
14	81	18	1
15	82	17	1
16	83	16	1
17	86	14	0
18	86	14	0
19	87	13	0
20	88	12	0
21	89	11	0
22	89	11	0
23	90	10	0
24	90	10	0
25	91	9	0
26	91	9	0
27	92	8	0
28	92	8	0
29	92	8	0
30	93	7	0

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

	Clearer (%)	Cloudier (%)
1	41	59
2	42	58
3	42	58
4	41	59
5	42	58
6	42	58
7	41	59
8	41	59
9	41	59
10	41	59
11	41	59
12	40	60
13	40	60
14	39	61
15	38	62
16	37	63
17	37	63
18	36	64
19	36	64
20	36	64
21	35	65
22	35	65
23	34	66
24	34	66
25	34	66
26	34	66
27	34	66
28	34	66
29	34	66
30	34	66

	Rain chance (%)
1	38
2	38
3	38
4	37
5	37
6	37
7	36
8	36
9	36
10	35
11	35
12	34
13	34
14	34
15	34
16	33
17	33
18	33
19	32
20	32
21	32
22	32
23	32
24	32
25	33
26	33
27	34
28	34
29	34
30	34

	Dry (%)	Comfortable (%)	Humid (%)
1	66	29	5
2	68	28	4
3	68	28	4
4	70	27	3
5	71	26	3
6	73	25	2
7	73	25	2
8	74	24	2
9	76	23	1
10	77	22	1
11	78	21	1
12	79	20	1
13	80	19	1
14	81	18	1
15	82	17	1
16	83	16	1
17	86	14	0
18	86	14	0
19	87	13	0
20	88	12	0
21	89	11	0
22	89	11	0
23	90	10	0
24	90	10	0
25	91	9	0
26	91	9	0
27	92	8	0
28	92	8	0
29	92	8	0
30	93	7	0