Tacna weather in September

In September, Tacna sees average daytime highs of 21°C and overnight lows near 14°C, with 2 mm of rain across 0.2 wet days and about 11.9 hours of daylight. It is the 9th-warmest and 9th-wettest month of the year here.

Day-to-day highs hold fairly steady near 21°C through the month. The sky is clear or mostly clear about 35% of the time in September, and the air most often feels dry.

Daylight stretches from about 11 h 36 min at the start of September to 12 h 06 min by month's end. Set against the rest of the year, September is Tacna's 2nd-clearest and 8th-windiest month. For the whole year in context, see Tacna's year-round climate.

Daytime high
21°
9th warmest
Overnight low
14°
4th coldest
Rainfall
2 mm
0.2 wet days
Daylight
11 h 54 min
5:38 AM – 5:32 PM
Cloud cover
50%
2nd clearest
Wind
7 km/h
8th windiest
Solar energy
6.32 kWh/m²
Travel score
8.1
out of 10

Tacna is city of Peru, capital of Tacna region.

Founded
1875

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 21°C through the month.

A typical September day in Tacna reaches about 21°C in the afternoon and slips back to 14°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 19°C and 23°C. Set against its neighbours, September runs about 1°C warmer than August and about 1°C cooler than October.

10°15°20°25°151015202530
Avg high (°C)Avg low (°C)
12114
22114
32114
42114
52114
62114
72114
82114
92114
102114
112114
122114
132114
142114
152114
162114
172114
182114
192114
202114
212114
222114
232114
242214
252214
262214
272214
282214
292214
302214

Tacna weather by month

How September compares with the rest of the year at a glance. September is the 9th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan25° / 17°236.5137.0
Feb25° / 18°236.912.66.8
Mar25° / 17°144.112.17.6
Apr24° / 16°20.411.68.6
May22° / 15°40.411.28.2
Jun21° / 14°50.410.97.8
Jul20° / 13°40.5117.7
Aug20° / 14°40.511.47.9
Sep21° / 14°20.211.98.1
Oct22° / 15°1012.48.2
Nov23° / 15°10.212.88.5
Dec24° / 16°61.413.18.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 35% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 40% of September, with mostly cloudy or overcast conditions the remaining 26%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17921
27921
37921
47921
57822
67822
77624
87525
97525
107426
117426
127426
137426
147426
157426
167426
177426
187426
197426
207327
217327
227327
237228
247327
257327
267228
277129
287030
297030
306931

Chance of precipitation in September

Any precipitation

Tacna gets around 2 mm of rain over 0.2 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 1% and peaks near 2% on the wettest days.

0%10%20%30%151015202530
Rain chance (%)
12
21
31
41
51
61
71
81
91
101
111
121
131
141
151
161
171
181
191
201
211
221
231
241
250
260
270
280
290
300

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 97% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)
1991
2991
3982
4982
5982
6982
7982
8982
9982
10973
11973
12973
13973
14973
15973
16973
17973
18973
19973
20973
21973
22973
23973
24973
25973
26973
27973
28964
29964
30964

Wind in September

Winds average 7 km/h in September.

Across September, daily wind ranges from about 6 km/h on the calmest days to 7 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 36 min at the start of September to 12 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 30 minutes over September. Sunrise moves from 5:51 AM to 5:26 AM, and sunset from 5:30 PM to 5:35 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.65:515:30
211.75:515:30
311.75:505:30
411.75:495:30
511.75:485:31
611.75:475:31
711.75:465:31
811.85:455:31
911.85:455:31
1011.85:445:31
1111.85:435:32
1211.85:425:32
1311.85:415:32
1411.95:405:32
1511.95:395:32
1611.95:385:32
1711.95:375:32
1811.95:375:33
1912.05:365:33
2012.05:355:33
2112.05:345:33
2212.05:335:33
2312.05:325:33
2412.05:315:34
2512.15:305:34
2612.15:295:34
2712.15:295:34
2812.15:285:34
2912.15:275:34
3012.15:265:35

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.32 kWh/m².

For context, solar energy here swings from a low near 4.34 kWh/m² to a high of 7.94 kWh/m² in November across the year — September's 6.32 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.8Bright
25.9Bright
35.9Bright
45.9Bright
56.0Bright
66.0Bright
76.0Intense
86.0Intense
96.1Intense
106.1Intense
116.2Intense
126.2Intense
136.2Intense
146.3Intense
156.3Intense
166.3Intense
176.4Intense
186.4Intense
196.4Intense
206.5Intense
216.5Intense
226.5Intense
236.6Intense
246.6Intense
256.6Intense
266.7Intense
276.7Intense
286.7Intense
296.8Intense
306.8Intense
Planning a trip in September

Is September a good time to visit Tacna?

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

8.1
Sightseeing
5th-best month of the year
5.0
Beach & pool
9th-best month of the year

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

What to pack for Tacna in September

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

In September, Tacna sees daytime highs around 21°C and nights near 14°C. Pack sun protection.

sun protection

Sea temperature near Tacna in September

The nearest coast averages about 17°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 41 km away) is warmest in February at about 23°C and coldest in August near 17°C.

It's comfortable for a long swim from Nov 26 to May 7 — about 5.4 months when the water holds above 20°C.

16°18°20°22°24°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan22Refreshing
Feb23Refreshing
Mar22Refreshing
Apr21Refreshing
May20Cool
Jun19Cool
Jul18Cool
Aug17Cool
Sep17Cool
Oct18Cool
Nov20Cool
Dec21Refreshing

UV index in Tacna in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Tacna peaks around February 9 at about 16 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 10 at about 7 (very high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeFeb 9UV 16Jul 10UV 7
UV index (midday)Level
Jan16Extreme
Feb16Extreme
Mar13Extreme
Apr12Extreme
May9Very high
Jun7Very high
Jul7Very high
Aug10Very high
Sep12Extreme
Oct14Extreme
Nov14Extreme
Dec14Extreme
Location & terrain

Where is Tacna?

Tacna sits at 18.0°S, 70.3°W, 567 m above sea level, in Peru. The nearest listed city is Arica, 51 km away.

San AntonioMoqueguaIloMollendoCiudad SateliteJacobo HunterIlave

Topography around Tacna

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

Within 3 km, the terrain around Tacna has significant variations in elevation — a maximum elevation change of 309 m around an average of 582 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,180 m; within 80 km, extreme variations in elevation — a maximum elevation change of 5,938 m.

The land around Tacna is covered by artificial surfaces (54%) and bare terrain (35%) within 3 km, bare terrain (90%) within 16 km, and bare terrain (71%) within 80 km.

3 km
309 m
16 km
1,180 m
80 km
5,938 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Arica 51 km · San Antonio 114 km · Moquegua 116 km · Ilo 123 km · Mollendo 217 km · Ciudad Satelite 222 km · Jacobo Hunter 223 km · Ilave 224 km

Peru travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type A / B / C
220 V · 60 Hz
Prices
≈ 51% of US
price level, 2025
GDP per capita
$9,684
2025
Happiness
6.0 / 10
World Happiness, 2025
Safe drinking water
49%
of population, 2024
Homicide rate
8.6
per 100k, 2021
Road deaths
13.6
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Moderate
EF EPI 519
Religion
Catholic 76%Evangelical Christian 16%no religion 5%other religions 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 Tacna (-18.0146°, -70.2536°, elevation 567 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).