Alta weather in September

In September, Alta sees average daytime highs of 9°C and overnight lows near 4°C, with 58 mm of precipitation across 12.3 wet days and about 12.9 hours of daylight. It is the 4th-warmest and 4th-wettest month of the year here.

Highs ease over the month, from about 12°C in the first days to 7°C by the end. The sky is clear or mostly clear about 8% of the time in September, and the air most often feels dry.

Daylight stretches from about 15 h 06 min at the start of September to 10 h 48 min by month's end. Set against the rest of the year, September is Alta's 4th-clearest and 6th-windiest month. For the whole year in context, see Alta's year-round climate.

Daytime high: 9°; 4th warmest
Overnight low: 4°; 9th coldest
Precipitation: 58 mm; 12.3 wet days
Daylight: 12 h 48 min; 4:56 AM – 5:47 PM
Cloud cover: 80%; 4th clearest
Wind: 9 km/h; 6th windiest
Solar energy: 1.52 kWh/m²
Travel score: 1.8; out of 10

Alta is settlement in Alta Municipality, Norway.

Density: 1,604/km²; people per km²
Founded: 2000

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

← August Alta 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 12°C in the first days to 7°C by the end.

A typical September day in Alta reaches about 9°C in the afternoon and slips back to 4°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 5°C and 14°C. Set against its neighbours, September runs about 5°C cooler than August and about 7°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)	12	12	12	12	12	11	11	11	11	11	11	10	10	10	10	9	9	9	9	9	8	8	8	8	7	7	7	7	7	6
Avg low (°C)	6	5	5	5	5	5	5	5	5	4	4	4	4	4	4	3	3	3	3	3	3	2	2	2	2	2	2	2	1	1

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

How September really feels in Alta

Once humidity and wind are folded in, September averages 0 days that feel above 32°C and 9 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

The story in September is cold — wind chill drags the overnight "feels like" below the raw low.

Alta 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.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Snow days	Daylight (hours)	Travel score
Jan	-7° / -14°	42	9.8	11.5	0.7	0.0
Feb	-7° / -13°	35	9.4	10.8	6.3	0.0
Mar	-3° / -10°	36	10.1	11.9	10.9	0.0
Apr	2° / -6°	36	10.8	11.2	15.5	0.0
May	7° / 0°	50	13	7.3	21.4	0.7
Jun	12° / 5°	70	14.2	1.2	24	2.6
Jul	16° / 9°	75	13.7	0	23.5	4.2
Aug	14° / 7°	69	12.6	0	17.8	3.7
Sep	9° / 4°	58	12.3	1.5	12.9	1.8
Oct	2° / -3°	57	12.8	8.4	8.3	0.0
Nov	-3° / -8°	40	9.6	9.5	2.4	0.0
Dec	-5° / -11°	40	10	11.4	0	0.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 8% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 11% of September, with mostly cloudy or overcast conditions the remaining 82%.

	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 (%)	15	16	17	17	17	17	18	18	18	18	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	20	19	20
Cloudier (%)	85	84	83	83	83	83	82	82	82	82	81	81	81	81	81	81	81	81	81	81	81	81	81	81	81	81	81	80	81	80

	Clearer (%)	Cloudier (%)
1	15	85
2	16	84
3	17	83
4	17	83
5	17	83
6	17	83
7	18	82
8	18	82
9	18	82
10	18	82
11	19	81
12	19	81
13	19	81
14	19	81
15	19	81
16	19	81
17	19	81
18	19	81
19	19	81
20	19	81
21	19	81
22	19	81
23	19	81
24	19	81
25	19	81
26	19	81
27	19	81
28	20	80
29	19	81
30	20	80

Chance of precipitation in September

Any precipitationSnow

Alta gets around 58 mm of rain and snow over 12.3 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 40% and peaks near 43% on the wettest days, and about 2 days bring snow.

	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 (%)	43	43	42	42	42	41	41	41	40	40	40	40	40	39	40	40	40	40	41	41	41	41	41	40	40	39	39	39	39	38
Snow chance (%)	1	1	1	1	1	1	1	1	1	2	2	2	3	3	4	4	5	5	6	7	7	8	8	9	9	10	10	11	11	12

	Rain chance (%)	Snow chance (%)
1	43	1
2	43	1
3	42	1
4	42	1
5	42	1
6	41	1
7	41	1
8	41	1
9	40	1
10	40	2
11	40	2
12	40	2
13	40	3
14	39	3
15	40	4
16	40	4
17	40	5
18	40	5
19	41	6
20	41	7
21	41	7
22	41	8
23	41	8
24	40	9
25	40	9
26	39	10
27	39	10
28	39	11
29	39	11
30	38	12

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 100% 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 (%)	99	99	99	99	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100
Comfortable (%)	1	1	1	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	99	1
4	99	1
5	100	0
6	100	0
7	100	0
8	100	0
9	100	0
10	100	0
11	100	0
12	100	0
13	100	0
14	100	0
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	100	0
29	100	0
30	100	0

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 15 h 06 min at the start of September to 10 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 258 minutes over September. Sunrise moves from 3:54 AM to 5:53 AM, and sunset from 7:00 PM to 4:40 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)	15.1	14.9	14.8	14.6	14.5	14.3	14.2	14.0	13.9	13.7	13.6	13.4	13.3	13.1	13.0	12.8	12.7	12.6	12.4	12.3	12.1	12.0	11.8	11.7	11.5	11.4	11.2	11.1	10.9	10.8
Sunrise (AM)	3:54	3:58	4:02	4:06	4:10	4:15	4:19	4:23	4:27	4:31	4:35	4:39	4:44	4:48	4:52	4:56	5:00	5:04	5:08	5:12	5:16	5:20	5:24	5:28	5:32	5:36	5:40	5:45	5:49	5:53
Sunset (PM)	7:00	6:55	6:50	6:45	6:40	6:35	6:30	6:25	6:21	6:16	6:11	6:06	6:01	5:56	5:52	5:47	5:42	5:37	5:32	5:27	5:23	5:18	5:13	5:08	5:04	4:59	4:54	4:49	4:44	4:40

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	15.1	3:54	7:00
2	14.9	3:58	6:55
3	14.8	4:02	6:50
4	14.6	4:06	6:45
5	14.5	4:10	6:40
6	14.3	4:15	6:35
7	14.2	4:19	6:30
8	14.0	4:23	6:25
9	13.9	4:27	6:21
10	13.7	4:31	6:16
11	13.6	4:35	6:11
12	13.4	4:39	6:06
13	13.3	4:44	6:01
14	13.1	4:48	5:56
15	13.0	4:52	5:52
16	12.8	4:56	5:47
17	12.7	5:00	5:42
18	12.6	5:04	5:37
19	12.4	5:08	5:32
20	12.3	5:12	5:27
21	12.1	5:16	5:23
22	12.0	5:20	5:18
23	11.8	5:24	5:13
24	11.7	5:28	5:08
25	11.5	5:32	5:04
26	11.4	5:36	4:59
27	11.2	5:40	4:54
28	11.1	5:45	4:49
29	10.9	5:49	4:44
30	10.8	5:53	4:40

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 1.52 kWh/m².

For context, solar energy here swings from a low near 0 kWh/m² to a high of 4.84 kWh/m² in May across the year — September's 1.52 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)	2.1	2.1	2.0	2.0	1.9	1.9	1.9	1.8	1.8	1.7	1.7	1.6	1.6	1.6	1.5	1.5	1.4	1.4	1.4	1.3	1.3	1.3	1.2	1.2	1.2	1.1	1.1	1.1	1.0	1.0
Level	Moderate	Moderate	Moderate	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim

	Solar energy (kWh/m²)	Level
1	2.1	Moderate
2	2.1	Moderate
3	2.0	Moderate
4	2.0	Dim
5	1.9	Dim
6	1.9	Dim
7	1.9	Dim
8	1.8	Dim
9	1.8	Dim
10	1.7	Dim
11	1.7	Dim
12	1.6	Dim
13	1.6	Dim
14	1.6	Dim
15	1.5	Dim
16	1.5	Dim
17	1.4	Dim
18	1.4	Dim
19	1.4	Dim
20	1.3	Dim
21	1.3	Dim
22	1.3	Dim
23	1.2	Dim
24	1.2	Dim
25	1.2	Dim
26	1.1	Dim
27	1.1	Dim
28	1.1	Dim
29	1.0	Dim
30	1.0	Dim

Planning a trip in September

Is September a good time to visit Alta?

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

1.8

Sightseeing

4th-best month of the year

—

Beach & pool

never really warm enough

September is a weaker month for outdoor sightseeing in Alta.

What to pack for Alta in September

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

In September, Alta sees daytime highs around 9°C and nights near 4°C. Pack a warm layer. Worth having: rain gear. About 12 days see rain.

a warm layerrain gear

Sea temperature near Alta in September

The nearest coast averages about 9°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 48 km away) is warmest in August at about 10°C and coldest in April near 3°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)	5	4	3	3	4	7	10	10	9	8	7	6
Comfort	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing

	Sea temperature (°C)	Comfort
Jan	5	Bracing
Feb	4	Bracing
Mar	3	Bracing
Apr	3	Bracing
May	4	Bracing
Jun	7	Bracing
Jul	10	Bracing
Aug	10	Bracing
Sep	9	Bracing
Oct	8	Bracing
Nov	7	Bracing
Dec	6	Bracing

UV index in Alta in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 1. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Alta peaks around July 13 at about 4 (moderate) — a little sun protection helps at midday. It bottoms out near January 1 at about 0 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 2 months of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	0	0	1	2	3	3	4	3	1	0	0	0
Level	Low	Low	Low	Low	Moderate	Moderate	Moderate	Moderate	Low	Low	Low	Low

	UV index (midday)	Level
Jan	0	Low
Feb	0	Low
Mar	1	Low
Apr	2	Low
May	3	Moderate
Jun	3	Moderate
Jul	4	Moderate
Aug	3	Moderate
Sep	1	Low
Oct	0	Low
Nov	0	Low
Dec	0	Low

Location & terrain

Where is Alta?

Alta sits at 70.0°N, 23.3°E, 65 m above sea level, in Norway. The nearest listed city is Tromsdalen, 167 km away.

Topography around Alta

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

Within 3 km, the terrain around Alta has only modest variations in elevation — a maximum elevation change of 208 m around an average of 21 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 998 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,343 m.

The land around Alta is covered by water (39%) and trees (31%) within 3 km, trees (35%), grassland (26%) and water (25%) within 16 km, and grassland (41%), moss and lichen (23%) and water (20%) within 80 km.

3 km

208 m

water 39%

16 km

998 m

trees 35%

80 km

1,343 m

grassland 41%

treesgrasslandartificial surfacesbare terrainsnow and icewaterwetlandmoss and lichen

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

September weather nearby: Tromsdalen 167 km · Tromso 169 km · Levi 248 km · Kiruna 265 km · Nikel 275 km · Harstad 294 km · Zapolyarnyy 297 km · Kovdor 394 km

Norway travel facts

Travel advisory: Level 1; Exercise Normal Precautions
Power plugs: Type C / F; 230 V · 50 Hz
Prices: ≈ 91% of US; price level, 2025
GDP per capita: $94,594; 2025
Happiness: 7.2 / 10; World Happiness, 2025
Safe drinking water: 99%; of population, 2024
Homicide rate: 0.7; per 100k, 2023
Road deaths: 2.1; per 100k/yr, 2019
Income group: High; World Bank
English: Very high; EF EPI 613
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 Alta (69.9689°, 23.2717°, elevation 65 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	12	6
2	12	5
3	12	5
4	12	5
5	12	5
6	11	5
7	11	5
8	11	5
9	11	5
10	11	4
11	11	4
12	10	4
13	10	4
14	10	4
15	10	4
16	9	3
17	9	3
18	9	3
19	9	3
20	9	3
21	8	3
22	8	2
23	8	2
24	8	2
25	7	2
26	7	2
27	7	2
28	7	2
29	7	1
30	6	1

	Clearer (%)	Cloudier (%)
1	15	85
2	16	84
3	17	83
4	17	83
5	17	83
6	17	83
7	18	82
8	18	82
9	18	82
10	18	82
11	19	81
12	19	81
13	19	81
14	19	81
15	19	81
16	19	81
17	19	81
18	19	81
19	19	81
20	19	81
21	19	81
22	19	81
23	19	81
24	19	81
25	19	81
26	19	81
27	19	81
28	20	80
29	19	81
30	20	80

	Rain chance (%)	Snow chance (%)
1	43	1
2	43	1
3	42	1
4	42	1
5	42	1
6	41	1
7	41	1
8	41	1
9	40	1
10	40	2
11	40	2
12	40	2
13	40	3
14	39	3
15	40	4
16	40	4
17	40	5
18	40	5
19	41	6
20	41	7
21	41	7
22	41	8
23	41	8
24	40	9
25	40	9
26	39	10
27	39	10
28	39	11
29	39	11
30	38	12

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	99	1
4	99	1
5	100	0
6	100	0
7	100	0
8	100	0
9	100	0
10	100	0
11	100	0
12	100	0
13	100	0
14	100	0
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	100	0
29	100	0
30	100	0

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

	Clearer (%)	Cloudier (%)
1	15	85
2	16	84
3	17	83
4	17	83
5	17	83
6	17	83
7	18	82
8	18	82
9	18	82
10	18	82
11	19	81
12	19	81
13	19	81
14	19	81
15	19	81
16	19	81
17	19	81
18	19	81
19	19	81
20	19	81
21	19	81
22	19	81
23	19	81
24	19	81
25	19	81
26	19	81
27	19	81
28	20	80
29	19	81
30	20	80

	Rain chance (%)	Snow chance (%)
1	43	1
2	43	1
3	42	1
4	42	1
5	42	1
6	41	1
7	41	1
8	41	1
9	40	1
10	40	2
11	40	2
12	40	2
13	40	3
14	39	3
15	40	4
16	40	4
17	40	5
18	40	5
19	41	6
20	41	7
21	41	7
22	41	8
23	41	8
24	40	9
25	40	9
26	39	10
27	39	10
28	39	11
29	39	11
30	38	12

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	99	1
4	99	1
5	100	0
6	100	0
7	100	0
8	100	0
9	100	0
10	100	0
11	100	0
12	100	0
13	100	0
14	100	0
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	100	0
29	100	0
30	100	0

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

	Clearer (%)	Cloudier (%)
1	15	85
2	16	84
3	17	83
4	17	83
5	17	83
6	17	83
7	18	82
8	18	82
9	18	82
10	18	82
11	19	81
12	19	81
13	19	81
14	19	81
15	19	81
16	19	81
17	19	81
18	19	81
19	19	81
20	19	81
21	19	81
22	19	81
23	19	81
24	19	81
25	19	81
26	19	81
27	19	81
28	20	80
29	19	81
30	20	80

	Rain chance (%)	Snow chance (%)
1	43	1
2	43	1
3	42	1
4	42	1
5	42	1
6	41	1
7	41	1
8	41	1
9	40	1
10	40	2
11	40	2
12	40	2
13	40	3
14	39	3
15	40	4
16	40	4
17	40	5
18	40	5
19	41	6
20	41	7
21	41	7
22	41	8
23	41	8
24	40	9
25	40	9
26	39	10
27	39	10
28	39	11
29	39	11
30	38	12

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	99	1
4	99	1
5	100	0
6	100	0
7	100	0
8	100	0
9	100	0
10	100	0
11	100	0
12	100	0
13	100	0
14	100	0
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	100	0
29	100	0
30	100	0