Sullana weather in September

In September, Sullana sees average daytime highs of 28°C and overnight lows near 17°C, with 1 mm of rain across 0.4 wet days and about 12 hours of daylight. It is the 10th-warmest and 10th-wettest month of the year here.

Day-to-day highs hold fairly steady near 28°C through the month. The sky is clear or mostly clear about 51% of the time in September, and the air most often feels comfortable.

Daylight stretches from about 11 h 54 min at the start of September to 12 hours by month's end. Set against the rest of the year, September is Sullana's 4th-clearest and 1st-windiest month. For the whole year in context, see Sullana's year-round climate.

Daytime high
28°
10th warmest
Overnight low
17°
2nd coldest
Rainfall
1 mm
0.4 wet days
Daylight
12 hours
6:18 AM – 6:16 PM
Cloud cover
45%
4th clearest
Wind
11 km/h
1st windiest
Solar energy
6.59 kWh/m²
Travel score
7.7
out of 10

Sullana is city in Piura, Peru.

Founded
1783

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 28°C through the month.

A typical September day in Sullana reaches about 28°C in the afternoon and slips back to 17°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 26°C and 30°C. Set against its neighbours, September runs on par with August and about 1°C cooler than October.

15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12717
22717
32817
42817
52817
62817
72817
82817
92817
102817
112817
122817
132817
142817
152817
162817
172817
182817
192817
202817
212817
222817
232817
242817
252817
262817
272817
282817
292817
302817

How September really feels in Sullana

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.

Sullana weather by month

How September compares with the rest of the year at a glance. September is the 10th-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan33° / 22°355.212.33.8
Feb33° / 23°759.912.23.1
Mar33° / 23°11411.2123.0
Apr33° / 22°426.511.93.7
May32° / 20°51.811.85.1
Jun29° / 19°20.811.76.8
Jul28° / 18°10.211.78.1
Aug27° / 17°00.111.88.4
Sep28° / 17°10.4127.7
Oct29° / 18°30.912.16.8
Nov30° / 18°71.812.26.1
Dec31° / 20°193.812.35.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 51% 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 32%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17723
27624
37525
47525
57426
67327
77228
87129
97030
107030
116931
126832
136832
146733
156634
166535
176535
186535
196535
206436
216436
226436
236436
246436
256436
266436
276436
286436
296436
306337

Chance of precipitation in September

Any precipitation

Sullana gets around 1 mm of rain over 0.4 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 (%)
10
21
31
41
51
61
71
81
91
101
111
121
131
141
151
161
171
182
192
202
212
222
232
242
252
262
272
282
292
301

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels comfortable — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the comfortable band about 55% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Comfortable (%)Humid (%)Muggy (%)
156413
255423
355423
455423
555423
655423
755423
855423
955423
1055423
1155423
1255423
1355423
1455423
1555423
1655423
1755423
1855423
1955423
2055423
2155423
2255423
2355423
2455423
2555423
2655423
2755423
2854433
2954433
3054433

Wind in September

Winds average 11 km/h in September, the windiest month of the year.

Across September, daily wind ranges from about 11 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 54 min at the start of September to 12 hours by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 6 minutes over September. Sunrise moves from 6:25 AM to 6:11 AM, and sunset from 6:20 PM to 6:13 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.96:256:20
211.96:256:19
311.96:246:19
411.96:246:19
511.96:236:19
611.96:236:19
711.96:226:18
811.96:226:18
911.96:216:18
1011.96:216:18
1112.06:206:17
1212.06:206:17
1312.06:196:17
1412.06:196:17
1512.06:186:17
1612.06:186:16
1712.06:176:16
1812.06:176:16
1912.06:166:16
2012.06:166:15
2112.06:156:15
2212.06:156:15
2312.06:146:15
2412.06:146:14
2512.06:136:14
2612.06:136:14
2712.06:126:14
2812.06:126:14
2912.06:116:13
3012.06:116:13

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.59 kWh/m².

For context, solar energy here swings from a low near 5.29 kWh/m² to a high of 6.72 kWh/m² in October across the year — September's 6.59 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
16.4Intense
26.4Intense
36.5Intense
46.5Intense
56.5Intense
66.5Intense
76.5Intense
86.5Intense
96.5Intense
106.5Intense
116.5Intense
126.6Intense
136.6Intense
146.6Intense
156.6Intense
166.6Intense
176.6Intense
186.6Intense
196.6Intense
206.6Intense
216.7Intense
226.7Intense
236.7Intense
246.7Intense
256.7Intense
266.7Intense
276.7Intense
286.7Intense
296.7Intense
306.7Intense
Planning a trip in September

Is September a good time to visit Sullana?

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

7.7
Sightseeing
3rd-best month of the year
8.5
Beach & pool
4th-best month of the year

September is one of the better times to visit Sullana for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Sullana in September

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

In September, Sullana sees daytime highs around 28°C and nights near 17°C. Pack light clothes and sun protection.

light clothessun protection

Sea temperature near Sullana in September

The nearest coast averages about 18°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 49 km away) is warmest in February at about 23°C and coldest in August near 18°C.

It's comfortable for a long swim from Dec 15 to May 28 — 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
Mar23Refreshing
Apr21Refreshing
May20Refreshing
Jun19Cool
Jul19Cool
Aug18Cool
Sep18Cool
Oct19Cool
Nov19Cool
Dec20Refreshing

UV index in Sullana 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 Sullana peaks around February 17 at about 16 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 23 at about 10 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeFeb 17UV 16Jun 23UV 10
UV index (midday)Level
Jan15Extreme
Feb16Extreme
Mar15Extreme
Apr13Extreme
May13Extreme
Jun10Extreme
Jul10Extreme
Aug11Extreme
Sep12Extreme
Oct14Extreme
Nov13Extreme
Dec13Extreme
Location & terrain

Where is Sullana?

Sullana sits at 4.9°S, 80.7°W, 60 m above sea level, in Peru. The nearest listed city is Marcavelica, 4.0 km away.

Topography around Sullana

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

Within 3 km, the terrain around Sullana has only modest variations in elevation — a maximum elevation change of 71 m around an average of 61 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 143 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,919 m.

The land around Sullana is covered by artificial surfaces (41%) and trees (22%) within 3 km, shrubs (28%) and bare terrain (28%) within 16 km, and shrubs (31%) and bare terrain (30%) within 80 km.

3 km
71 m
16 km
143 m
80 km
2,919 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Marcavelica 4.0 km · Querecotillo 9.0 km · Piura 31 km · San Martin 31 km · Tambo Grande 38 km · Catacaos 40 km · Paita 52 km · La Unión 56 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 Sullana (-4.9039°, -80.6853°, elevation 60 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).