Pärnu weather in September

In September, Pärnu sees average daytime highs of 16°C and overnight lows near 8°C, with 56 mm of rain across 10.7 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 14°C by the end. The sky is clear or mostly clear about 19% 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 Pärnu's 6th-clearest and 7th-windiest month. For the whole year in context, see Pärnu's year-round climate.

Daytime high
16°
5th warmest
Overnight low
9th coldest
Rainfall
56 mm
10.7 wet days
Daylight
12 h 30 min
6:01 AM – 6:31 PM
Cloud cover
67%
6th clearest
Wind
13 km/h
7th windiest
Solar energy
2.6 kWh/m²
Travel score
4.7
out of 10

Pärnu is city in Estonia.

Density
1,214/km²
people per km²
Founded
1251

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

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 14°C by the end.

A typical September day in Pärnu 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 12°C and 20°C. Set against its neighbours, September runs about 5°C cooler than August and about 7°C warmer than October.

10°15°20°25°151015202530
Avg high (°C)Avg low (°C)
11910
21910
31810
41810
51810
6189
7189
8179
9179
10179
11179
12179
13168
14168
15168
16168
17168
18168
19158
20157
21157
22157
23157
24147
25147
26147
27147
28146
29136
30136

How September really feels in Pärnu

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.

Pärnu 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.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-1° / -6°4811.18.36.80.0
Feb-1° / -7°439.58.38.90.0
Mar / -4°409.75.811.40.1
Apr10° / 42102142.3
May16° / 469.50.116.45.2
Jun20° / 10°8312.4017.85.9
Jul22° / 13°8312.3017.36.4
Aug21° / 12°8612.8015.16.0
Sep16° / 5610.7012.54.7
Oct / 6211.70.79.91.9
Nov / 5210.63.57.50.1
Dec / -3°5211.37.26.20.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 19% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 65%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13466
23565
33565
43565
53664
63664
73664
83664
93664
103763
113763
123763
133763
143763
153862
163862
173763
183763
193763
203664
213664
223565
233565
243466
253466
263466
273367
283367
293367
303268

Chance of precipitation in September

Any precipitation

Pärnu gets around 56 mm of rain over 10.7 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 36% and peaks near 41% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
141
241
340
440
540
639
739
839
938
1038
1137
1237
1336
1436
1535
1635
1734
1834
1933
2033
2133
2233
2333
2434
2534
2634
2734
2835
2935
3036

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 86% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
170273
271263
373252
474242
575232
676222
778211
879201
980191
1081181
1182171
1284151
1386140
1487130
1588120
1689110
1790100
189190
199280
209370
219370
229460
239460
249460
259550
269550
279550
289640
299640
309640

Wind in September

Winds average 13 km/h in September.

Across September, daily wind ranges from about 12 km/h on the calmest days to 14 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
112light breeze
212light breeze
312light breeze
412light breeze
512light breeze
612light breeze
712light breeze
813light breeze
913light breeze
1013light breeze
1113light breeze
1213light breeze
1313light breeze
1413light breeze
1513light breeze
1613light breeze
1713light breeze
1813light breeze
1913light breeze
2013light breeze
2113light breeze
2213light breeze
2313light breeze
2413light breeze
2513light breeze
2613light breeze
2713light breeze
2813light breeze
2913light breeze
3014light 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 5:28 AM to 6:33 AM, and sunset from 7:16 PM to 5:50 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.85:287:16
213.75:307:13
313.65:327:10
413.55:347:07
513.55:377:04
613.45:397:01
713.35:416:58
813.25:436:55
913.15:466:52
1013.05:486:49
1112.95:506:46
1212.95:526:43
1312.85:556:40
1412.75:576:37
1512.65:596:34
1612.56:016:31
1712.46:046:28
1812.36:066:25
1912.26:086:22
2012.26:106:19
2112.16:136:16
2212.06:156:13
2311.96:176:10
2411.86:196:07
2511.76:226:05
2611.66:246:02
2711.56:265:59
2811.56:285:56
2911.46:315:53
3011.36:335:50

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 2.6 kWh/m².

For context, solar energy here swings from a low near 0.23 kWh/m² to a high of 5.72 kWh/m² in June across the year — September's 2.6 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
83.0Moderate
92.9Moderate
102.9Moderate
112.8Moderate
122.8Moderate
132.7Moderate
142.7Moderate
152.6Moderate
162.6Moderate
172.5Moderate
182.5Moderate
192.5Moderate
202.4Moderate
212.4Moderate
222.3Moderate
232.3Moderate
242.2Moderate
252.2Moderate
262.1Moderate
272.1Moderate
282.0Moderate
292.0Dim
301.9Dim
Planning a trip in September

Is September a good time to visit Pärnu?

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

4.7
Sightseeing
5th-best month of the year
0.8
Beach & pool
5th-best month of the year

September is a reasonable time to visit Pärnu for sightseeing.

What to pack for Pärnu in September

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

In September, Pärnu 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

Sea temperature near Pärnu 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 offshore is warmest in August at about 19°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
Jan2Bracing
Feb0Bracing
Mar1Bracing
Apr3Bracing
May9Bracing
Jun14Bracing
Jul18Cool
Aug19Cool
Sep15Cool
Oct11Bracing
Nov7Bracing
Dec4Bracing

UV index in Pärnu 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 Pärnu peaks around June 19 at about 6 (high) — a little sun protection helps at midday. It bottoms out near December 19 at about 0 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 5 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJun 19UV 6Dec 19UV 0
UV index (midday)Level
Jan0Low
Feb1Low
Mar2Low
Apr3Moderate
May4Moderate
Jun6High
Jul5Moderate
Aug5Moderate
Sep3Moderate
Oct1Low
Nov0Low
Dec0Low
Location & terrain

Where is Pärnu?

Pärnu sits at 58.4°N, 24.5°E, 6 m above sea level, in Estonia. The nearest listed city is Viljandi, 64 km away.

ViljandiMuhuHaapsaluRuhnuValmieraNõmmeValgaMustamäe

Topography around Pärnu

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

Within 3 km, the terrain around Pärnu has only modest variations in elevation — a maximum elevation change of 35 m around an average of 5 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 54 m; within 80 km, only modest variations in elevation — a maximum elevation change of 164 m.

The land around Pärnu is covered by water (28%), artificial surfaces (25%) and trees (24%) within 3 km, trees (33%) and water (27%) within 16 km, and trees (48%) and water (24%) within 80 km.

3 km
35 m
16 km
54 m
80 km
164 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: Viljandi 64 km · Muhu 77 km · Haapsalu 83 km · Ruhnu 98 km · Valmiera 109 km · Nõmme 111 km · Valga 113 km · Mustamäe 114 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
none 58%Orthodox 17%Protestant 9%other 3%

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 Pärnu (58.3859°, 24.4971°, elevation 6 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).