Viljandi weather in September

In September, Viljandi sees average daytime highs of 16°C and overnight lows near 8°C, with 57 mm of rain across 11.2 wet days and about 12.5 hours of daylight. It is the 5th-warmest and 5th-wettest month of the year here.

Highs ease over the month, from about 18°C in the first days to 13°C by the end. The sky is clear or mostly clear about 17% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 48 min at the start of September to 11 h 18 min by month's end. Set against the rest of the year, September is Viljandi's 6th-clearest and 7th-windiest month. For the whole year in context, see Viljandi's year-round climate.

Daytime high: 16°; 5th warmest
Overnight low: 8°; 9th coldest
Rainfall: 57 mm; 11.2 wet days
Daylight: 12 h 30 min; 5:57 AM – 6:27 PM
Cloud cover: 69%; 6th clearest
Wind: 14 km/h; 7th windiest
Solar energy: 2.5 kWh/m²
Travel score: 4.5; out of 10

Viljandi is town in southern Estonia.

Density: 1,187/km²; people per km²
Founded: 1263

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

← August Viljandi 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 18°C in the first days to 13°C by the end.

A typical September day in Viljandi reaches about 16°C in the afternoon and slips back to 8°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 11°C and 20°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)	18	18	18	18	18	17	17	17	17	17	16	16	16	16	16	15	15	15	15	15	15	14	14	14	14	14	13	13	13	13
Avg low (°C)	10	10	10	10	10	9	9	9	9	9	9	9	8	8	8	8	8	8	7	7	7	7	7	7	7	7	6	6	6	6

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

How September really feels in Viljandi

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.

Viljandi weather by month

How September compares with the rest of the year at a glance. September is the 5th-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	-2° / -6°	47	11.1	9.3	6.8	0.0
Feb	-2° / -7°	41	9.4	8	8.9	0.0
Mar	3° / -4°	39	9.6	6.3	11.4	0.0
Apr	10° / 1°	43	9.8	2.2	14	2.2
May	16° / 6°	53	10.6	0.1	16.4	4.9
Jun	19° / 10°	90	12.7	0	17.8	5.7
Jul	22° / 13°	81	12.4	0	17.2	6.2
Aug	21° / 12°	90	13.3	0	15.1	5.9
Sep	16° / 8°	57	11.2	0	12.5	4.5
Oct	9° / 3°	66	11.9	0.9	9.9	1.6
Nov	3° / -1°	53	11.2	4.4	7.5	0.0
Dec	-0° / -4°	50	11.5	8.4	6.2	0.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 17% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 16% of September, with mostly cloudy or overcast conditions the remaining 67%.

	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 (%)	32	31	31	32	32	33	33	33	32	33	33	33	34	34	34	34	35	35	35	34	34	34	33	33	32	31	30	30	29	29
Cloudier (%)	68	69	69	68	68	67	67	67	68	67	67	67	66	66	66	66	65	65	65	66	66	66	67	67	68	69	70	70	71	71

	Clearer (%)	Cloudier (%)
1	32	68
2	31	69
3	31	69
4	32	68
5	32	68
6	33	67
7	33	67
8	33	67
9	32	68
10	33	67
11	33	67
12	33	67
13	34	66
14	34	66
15	34	66
16	34	66
17	35	65
18	35	65
19	35	65
20	34	66
21	34	66
22	34	66
23	33	67
24	33	67
25	32	68
26	31	69
27	30	70
28	30	70
29	29	71
30	29	71

Chance of precipitation in September

Any precipitation

Viljandi gets around 57 mm of rain over 11.2 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 38% and peaks near 41% 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 (%)	41	41	40	40	40	39	39	39	39	39	39	39	39	38	38	37	37	37	36	36	36	36	36	36	36	36	36	36	37	37

	Rain chance (%)
1	41
2	41
3	40
4	40
5	40
6	39
7	39
8	39
9	39
10	39
11	39
12	39
13	39
14	38
15	38
16	37
17	37
18	37
19	36
20	36
21	36
22	36
23	36
24	36
25	36
26	36
27	36
28	36
29	37
30	37

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 89% 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 (%)	76	77	77	78	79	81	82	83	84	85	86	87	89	90	91	92	93	93	94	95	95	96	96	97	97	97	97	98	98	98
Comfortable (%)	22	21	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	7	6	5	5	4	4	3	3	3	3	2	2	2
Humid (%)	2	2	2	2	2	1	1	1	1	1	1	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0

	Dry (%)	Comfortable (%)	Humid (%)
1	76	22	2
2	77	21	2
3	77	21	2
4	78	20	2
5	79	19	2
6	81	18	1
7	82	17	1
8	83	16	1
9	84	15	1
10	85	14	1
11	86	13	1
12	87	12	1
13	89	11	0
14	90	10	0
15	91	9	0
16	92	8	0
17	93	7	0
18	93	7	0
19	94	6	0
20	95	5	0
21	95	5	0
22	96	4	0
23	96	4	0
24	97	3	0
25	97	3	0
26	97	3	0
27	97	3	0
28	98	2	0
29	98	2	0
30	98	2	0

Wind in September

Winds average 14 km/h in September.

Across September, daily wind ranges from about 13 km/h on the calmest days to 14 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)	13	13	13	13	13	13	13	13	13	13	13	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14
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	13	light breeze
2	13	light breeze
3	13	light breeze
4	13	light breeze
5	13	light breeze
6	13	light breeze
7	13	light breeze
8	13	light breeze
9	13	light breeze
10	13	light breeze
11	13	light breeze
12	14	light breeze
13	14	light breeze
14	14	light breeze
15	14	light breeze
16	14	light breeze
17	14	light breeze
18	14	light breeze
19	14	light breeze
20	14	light breeze
21	14	light breeze
22	14	light breeze
23	14	light breeze
24	14	light breeze
25	14	light breeze
26	14	light breeze
27	14	light breeze
28	14	light breeze
29	14	light breeze
30	14	light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 48 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 150 minutes over September. Sunrise moves from 5:23 AM to 6:29 AM, and sunset from 7:11 PM to 5:45 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)	13.8	13.7	13.6	13.5	13.5	13.4	13.3	13.2	13.1	13.0	12.9	12.9	12.8	12.7	12.6	12.5	12.4	12.3	12.2	12.2	12.1	12.0	11.9	11.8	11.7	11.6	11.5	11.5	11.4	11.3
Sunrise (AM)	5:23	5:26	5:28	5:30	5:32	5:34	5:37	5:39	5:41	5:43	5:46	5:48	5:50	5:52	5:55	5:57	5:59	6:01	6:04	6:06	6:08	6:10	6:13	6:15	6:17	6:19	6:22	6:24	6:26	6:29
Sunset (PM)	7:11	7:09	7:06	7:03	7:00	6:57	6:54	6:51	6:48	6:45	6:42	6:39	6:36	6:33	6:30	6:27	6:24	6:21	6:18	6:15	6:12	6:09	6:06	6:03	6:00	5:57	5:54	5:51	5:48	5:45

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	13.8	5:23	7:11
2	13.7	5:26	7:09
3	13.6	5:28	7:06
4	13.5	5:30	7:03
5	13.5	5:32	7:00
6	13.4	5:34	6:57
7	13.3	5:37	6:54
8	13.2	5:39	6:51
9	13.1	5:41	6:48
10	13.0	5:43	6:45
11	12.9	5:46	6:42
12	12.9	5:48	6:39
13	12.8	5:50	6:36
14	12.7	5:52	6:33
15	12.6	5:55	6:30
16	12.5	5:57	6:27
17	12.4	5:59	6:24
18	12.3	6:01	6:21
19	12.2	6:04	6:18
20	12.2	6:06	6:15
21	12.1	6:08	6:12
22	12.0	6:10	6:09
23	11.9	6:13	6:06
24	11.8	6:15	6:03
25	11.7	6:17	6:00
26	11.6	6:19	5:57
27	11.5	6:22	5:54
28	11.5	6:24	5:51
29	11.4	6:26	5:48
30	11.3	6:29	5:45

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 2.5 kWh/m².

For context, solar energy here swings from a low near 0.23 kWh/m² to a high of 5.46 kWh/m² in June across the year — September's 2.5 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)	3.2	3.1	3.1	3.0	3.0	2.9	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	2.1	2.0	2.0	1.9	1.9	1.8
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	Dim	Dim	Dim	Dim

	Solar energy (kWh/m²)	Level
1	3.2	Moderate
2	3.1	Moderate
3	3.1	Moderate
4	3.0	Moderate
5	3.0	Moderate
6	2.9	Moderate
7	2.9	Moderate
8	2.9	Moderate
9	2.8	Moderate
10	2.8	Moderate
11	2.7	Moderate
12	2.7	Moderate
13	2.6	Moderate
14	2.6	Moderate
15	2.5	Moderate
16	2.5	Moderate
17	2.5	Moderate
18	2.4	Moderate
19	2.4	Moderate
20	2.3	Moderate
21	2.3	Moderate
22	2.2	Moderate
23	2.2	Moderate
24	2.1	Moderate
25	2.1	Moderate
26	2.0	Moderate
27	2.0	Dim
28	1.9	Dim
29	1.9	Dim
30	1.8	Dim

Planning a trip in September

Is September a good time to visit Viljandi?

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

4.5

Sightseeing

5th-best month of the year

0.6

Beach & pool

5th-best month of the year

September is a reasonable time to visit Viljandi for sightseeing.

What to pack for Viljandi in September

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

In September, Viljandi sees daytime highs around 16°C and nights near 8°C. Worth packing: a warm layer and rain gear. About 11 days see rain.

a warm layerrain gear

UV index in Viljandi in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 3. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Viljandi peaks around June 20 at about 6 (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 5 months of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	0	1	2	3	4	6	5	5	3	1	0	0
Level	Low	Low	Low	Moderate	Moderate	High	High	Moderate	Moderate	Low	Low	Low

	UV index (midday)	Level
Jan	0	Low
Feb	1	Low
Mar	2	Low
Apr	3	Moderate
May	4	Moderate
Jun	6	High
Jul	5	High
Aug	5	Moderate
Sep	3	Moderate
Oct	1	Low
Nov	0	Low
Dec	0	Low

Location & terrain

Where is Viljandi?

Viljandi sits at 58.4°N, 25.6°E, 84 m above sea level, in Estonia. The nearest listed city is Otepää, 63 km away.

Topography around Viljandi

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

Within 3 km, the terrain around Viljandi has only modest variations in elevation — a maximum elevation change of 67 m around an average of 74 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 119 m; within 80 km, only modest variations in elevation — a maximum elevation change of 222 m.

The land around Viljandi is covered by trees (33%), grassland (26%) and cropland (21%) within 3 km, trees (56%) and cropland (26%) within 16 km, and trees (60%) within 80 km.

3 km

67 m

trees 33%

16 km

119 m

trees 56%

80 km

222 m

trees 60%

treesgrasslandcroplandartificial surfaceswaterwetland

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

September weather nearby: Otepää 63 km · Pärnu 64 km · Tartu 66 km · Valga 70 km · Valmiera 92 km · Rakvere 118 km · Cēsis 118 km · Nõmme 124 km

Estonia travel facts

Travel advisory: Level 1; Exercise Normal Precautions
Power plugs: Type C / F; 230 V · 50 Hz
Prices: ≈ 66% of US; price level, 2025
GDP per capita: $34,418; 2025
Happiness: 6.4 / 10; World Happiness, 2025
Safe drinking water: 99%; of population, 2024
Homicide rate: 1.5; per 100k, 2023
Road deaths: 4.5; per 100k/yr, 2019
Income group: High; World Bank
English: High; EF EPI 561
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 Viljandi (58.3632°, 25.5916°, elevation 84 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. 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	18	10
2	18	10
3	18	10
4	18	10
5	18	10
6	17	9
7	17	9
8	17	9
9	17	9
10	17	9
11	16	9
12	16	9
13	16	8
14	16	8
15	16	8
16	15	8
17	15	8
18	15	8
19	15	7
20	15	7
21	15	7
22	14	7
23	14	7
24	14	7
25	14	7
26	14	7
27	13	6
28	13	6
29	13	6
30	13	6

	Clearer (%)	Cloudier (%)
1	32	68
2	31	69
3	31	69
4	32	68
5	32	68
6	33	67
7	33	67
8	33	67
9	32	68
10	33	67
11	33	67
12	33	67
13	34	66
14	34	66
15	34	66
16	34	66
17	35	65
18	35	65
19	35	65
20	34	66
21	34	66
22	34	66
23	33	67
24	33	67
25	32	68
26	31	69
27	30	70
28	30	70
29	29	71
30	29	71

	Rain chance (%)
1	41
2	41
3	40
4	40
5	40
6	39
7	39
8	39
9	39
10	39
11	39
12	39
13	39
14	38
15	38
16	37
17	37
18	37
19	36
20	36
21	36
22	36
23	36
24	36
25	36
26	36
27	36
28	36
29	37
30	37

	Dry (%)	Comfortable (%)	Humid (%)
1	76	22	2
2	77	21	2
3	77	21	2
4	78	20	2
5	79	19	2
6	81	18	1
7	82	17	1
8	83	16	1
9	84	15	1
10	85	14	1
11	86	13	1
12	87	12	1
13	89	11	0
14	90	10	0
15	91	9	0
16	92	8	0
17	93	7	0
18	93	7	0
19	94	6	0
20	95	5	0
21	95	5	0
22	96	4	0
23	96	4	0
24	97	3	0
25	97	3	0
26	97	3	0
27	97	3	0
28	98	2	0
29	98	2	0
30	98	2	0

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

	Clearer (%)	Cloudier (%)
1	32	68
2	31	69
3	31	69
4	32	68
5	32	68
6	33	67
7	33	67
8	33	67
9	32	68
10	33	67
11	33	67
12	33	67
13	34	66
14	34	66
15	34	66
16	34	66
17	35	65
18	35	65
19	35	65
20	34	66
21	34	66
22	34	66
23	33	67
24	33	67
25	32	68
26	31	69
27	30	70
28	30	70
29	29	71
30	29	71

	Rain chance (%)
1	41
2	41
3	40
4	40
5	40
6	39
7	39
8	39
9	39
10	39
11	39
12	39
13	39
14	38
15	38
16	37
17	37
18	37
19	36
20	36
21	36
22	36
23	36
24	36
25	36
26	36
27	36
28	36
29	37
30	37

	Dry (%)	Comfortable (%)	Humid (%)
1	76	22	2
2	77	21	2
3	77	21	2
4	78	20	2
5	79	19	2
6	81	18	1
7	82	17	1
8	83	16	1
9	84	15	1
10	85	14	1
11	86	13	1
12	87	12	1
13	89	11	0
14	90	10	0
15	91	9	0
16	92	8	0
17	93	7	0
18	93	7	0
19	94	6	0
20	95	5	0
21	95	5	0
22	96	4	0
23	96	4	0
24	97	3	0
25	97	3	0
26	97	3	0
27	97	3	0
28	98	2	0
29	98	2	0
30	98	2	0

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

	Clearer (%)	Cloudier (%)
1	32	68
2	31	69
3	31	69
4	32	68
5	32	68
6	33	67
7	33	67
8	33	67
9	32	68
10	33	67
11	33	67
12	33	67
13	34	66
14	34	66
15	34	66
16	34	66
17	35	65
18	35	65
19	35	65
20	34	66
21	34	66
22	34	66
23	33	67
24	33	67
25	32	68
26	31	69
27	30	70
28	30	70
29	29	71
30	29	71

	Rain chance (%)
1	41
2	41
3	40
4	40
5	40
6	39
7	39
8	39
9	39
10	39
11	39
12	39
13	39
14	38
15	38
16	37
17	37
18	37
19	36
20	36
21	36
22	36
23	36
24	36
25	36
26	36
27	36
28	36
29	37
30	37

	Dry (%)	Comfortable (%)	Humid (%)
1	76	22	2
2	77	21	2
3	77	21	2
4	78	20	2
5	79	19	2
6	81	18	1
7	82	17	1
8	83	16	1
9	84	15	1
10	85	14	1
11	86	13	1
12	87	12	1
13	89	11	0
14	90	10	0
15	91	9	0
16	92	8	0
17	93	7	0
18	93	7	0
19	94	6	0
20	95	5	0
21	95	5	0
22	96	4	0
23	96	4	0
24	97	3	0
25	97	3	0
26	97	3	0
27	97	3	0
28	98	2	0
29	98	2	0
30	98	2	0