Mtwara weather in September

In September, Mtwara sees average daytime highs of 26°C and overnight lows near 23°C, with 10 mm of rain across 3.2 wet days and about 11.9 hours of daylight. It is the 12th-warmest and 9th-wettest month of the year here.

Day-to-day highs hold fairly steady near 26°C through the month. The sky is clear or mostly clear about 84% of the time in September, and the air most often feels muggy.

Daylight stretches from about 11 h 48 min at the start of September to 12 h 06 min by month's end. Set against the rest of the year, September is Mtwara's 1st-clearest and 7th-windiest month. For the whole year in context, see Mtwara's year-round climate.

Daytime high
26°
12th warmest
Overnight low
23°
4th coldest
Rainfall
10 mm
3.2 wet days
Daylight
11 h 54 min
6:15 AM – 6:12 PM
Cloud cover
25%
1st clearest
Wind
17 km/h
7th windiest
Solar energy
6.19 kWh/m²
Travel score
8.5
out of 10

Mtwara is city.

Founded
1971

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 26°C through the month.

A typical September day in Mtwara reaches about 26°C in the afternoon and slips back to 23°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between 25°C and 27°C. Set against its neighbours, September runs on par with August and on par with October.

20°23°25°28°30°151015202530
Avg high (°C)Avg low (°C)
12623
22623
32623
42623
52623
62623
72623
82623
92623
102623
112623
122623
132623
142623
152623
162623
172623
182624
192624
202624
212624
222624
232624
242624
252624
262624
272624
282624
292624
302624

How September really feels in Mtwara

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.

Mtwara weather by month

How September compares with the rest of the year at a glance. September is the 12th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 26°18620.512.54.8
Feb28° / 26°14518.412.34.7
Mar28° / 26°18223.812.14.1
Apr28° / 25°11518.511.84.8
May28° / 25°387.211.56.9
Jun27° / 23°81.811.48.1
Jul26° / 23°51.311.58.4
Aug26° / 23°61.611.78.6
Sep26° / 23°103.211.98.5
Oct26° / 24°20612.27.9
Nov27° / 25°4210.712.56.8
Dec28° / 26°12320.912.65.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 84% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 10% of September, with mostly cloudy or overcast conditions the remaining 6%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1946
2946
3946
4946
5946
6946
7946
8946
9946
10946
11946
12946
13946
14946
15946
16946
17946
18946
19946
20946
21955
22955
23955
24955
25955
26955
27955
28955
29955
30955

Chance of precipitation in September

Any precipitation

Mtwara gets around 10 mm of rain over 3.2 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 10% and peaks near 17% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%151015202530
Rain chance (%)
15
25
36
46
56
67
77
87
98
108
118
129
139
149
159
1610
1710
1811
1911
2012
2112
2213
2314
2414
2515
2615
2716
2816
2917
3017

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the muggy band about 59% of days. Sticky, muggy-or-worse air turns up on roughly 99% of them.

0%25%50%75%100%151015202530
Humid (%)Muggy (%)Oppressive (%)
147917
237918
337819
437621
537522
637423
737324
837225
927226
1027127
1127028
1226830
1326632
1416534
1516336
1616138
1715940
1815643
1915445
2015247
2105050
2204852
2304555
2404357
2504159
2603961
2703763
2803664
2903466
3003367

Wind in September

Winds average 17 km/h in September.

Across September, daily wind ranges from about 17 km/h on the calmest days to 19 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202530
Wind speed (km/h)Feels
119light breeze
218light breeze
318light breeze
418light breeze
518light breeze
618light breeze
718light breeze
818light breeze
918light breeze
1018light breeze
1118light breeze
1218light breeze
1317light breeze
1417light breeze
1517light breeze
1617light breeze
1717light breeze
1817light breeze
1917light breeze
2017light breeze
2117light breeze
2217light breeze
2317light breeze
2417light breeze
2517light breeze
2617light breeze
2717light breeze
2817light breeze
2917light breeze
3017light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 48 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 18 minutes over September. Sunrise moves from 6:25 AM to 6:06 AM, and sunset from 6:13 PM to 6:11 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.86:256:13
211.86:246:13
311.86:246:13
411.86:236:13
511.86:226:13
611.86:226:13
711.96:216:13
811.96:216:13
911.96:206:12
1011.96:196:12
1111.96:196:12
1211.96:186:12
1311.96:176:12
1411.96:176:12
1511.96:166:12
1611.96:156:12
1712.06:156:12
1812.06:146:12
1912.06:136:12
2012.06:136:12
2112.06:126:12
2212.06:116:11
2312.06:116:11
2412.06:106:11
2512.06:096:11
2612.06:096:11
2712.16:086:11
2812.16:076:11
2912.16:076:11
3012.16:066:11

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.19 kWh/m².

For context, solar energy here swings from a low near 4.9 kWh/m² to a high of 6.77 kWh/m² in November across the year — September's 6.19 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.9Bright
25.9Bright
35.9Bright
46.0Bright
56.0Bright
66.0Intense
76.0Intense
86.0Intense
96.1Intense
106.1Intense
116.1Intense
126.1Intense
136.2Intense
146.2Intense
156.2Intense
166.2Intense
176.2Intense
186.3Intense
196.3Intense
206.3Intense
216.3Intense
226.3Intense
236.3Intense
246.4Intense
256.4Intense
266.4Intense
276.4Intense
286.4Intense
296.4Intense
306.5Intense
Planning a trip in September

Hazard calendar for Mtwara

In seasonPeak

None of Mtwara's seasonal hazards are active in September. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Mtwara sits in the South Indian Ocean cyclone belt; the season peaks January–March.

Mtwara's monsoon runs December–April, when most of the year's rain falls.

Cyclone
Monsoon
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is September a good time to visit Mtwara?

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

8.5
Sightseeing
2nd-best month of the year
8.0
Beach & pool
4th-best month of the year

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

What to pack for Mtwara in September

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

In September, Mtwara sees daytime highs around 26°C and nights near 23°C. Pack sun protection. Worth having: light clothes. About 3 days see rain.

sun protectionlight clothes

Sea temperature near Mtwara in September

The nearest coast averages about 26°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 17 km away) is warmest in March at about 29°C and coldest in August near 26°C.

The water stays above 20°C all year — warm enough for a swim any month.

24°26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan29Tropical
Feb29Tropical
Mar29Tropical
Apr29Tropical
May28Tropical
Jun27Warm
Jul26Warm
Aug26Warm
Sep26Warm
Oct27Warm
Nov28Warm
Dec29Tropical

UV index in Mtwara in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Mtwara peaks around March 13 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 21 at about 9 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeMar 13UV 15Jun 21UV 9
UV index (midday)Level
Jan13Extreme
Feb14Extreme
Mar15Extreme
Apr13Extreme
May10Very high
Jun9Very high
Jul9Very high
Aug11Extreme
Sep13Extreme
Oct13Extreme
Nov12Extreme
Dec13Extreme
Location & terrain

Where is Mtwara?

Mtwara sits at 10.3°S, 40.2°E, 21 m above sea level, in Tanzania. The nearest listed city is Lindi, 59 km away.

KitamaTandahimbaNyangaoNangangaLuchinguMocímboa

Topography around Mtwara

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

Within 3 km, the terrain around Mtwara has only modest variations in elevation — a maximum elevation change of 43 m around an average of 10 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 163 m; within 80 km, significant variations in elevation — a maximum elevation change of 460 m.

The land around Mtwara is covered by water (38%) and artificial surfaces (25%) within 3 km, water (39%) and trees (31%) within 16 km, and water (39%) and trees (36%) within 80 km.

3 km
43 m
16 km
163 m
80 km
460 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwaterwetlandmangroves
September weather nearby: Lindi 59 km · Nanyamba 60 km · Kitama 70 km · Tandahimba 81 km · Nyangao 99 km · Nanganga 114 km · Luchingu 117 km · Mocímboa 118 km

Tanzania travel facts

Travel advisory
Level 3
Reconsider Travel
Power plugs
Type D / G
230 V · 50 Hz
Prices
≈ 29% of US
price level, 2025
GDP per capita
$1,319
2025
Happiness
3.9 / 10
World Happiness, 2025
Safe drinking water
31%
of population, 2024
Homicide rate
3.7
per 100k, 2020
Road deaths
31.1
per 100k/yr, 2019
Income group
Lower middle
World Bank
English
Low
EF EPI 479
Religion
Christian 63%Muslim 34%folk religion 1%

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 Mtwara (-10.2667°, 40.1833°, elevation 21 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). 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).