Kasulu weather in May

In May, Kasulu sees average daytime highs of 26°C and overnight lows near 17°C, with 68 mm of rain across 11.1 wet days and about 11.8 hours of daylight. It is the 6th-warmest and 8th-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 17% of the time in May, and the air most often feels humid.

Daylight stretches from about 11 h 48 min at the start of May to 11 h 48 min by month's end. Set against the rest of the year, May is Kasulu's 5th-clearest and 4th-windiest month. For the whole year in context, see Kasulu's year-round climate.

Daytime high
26°
6th warmest
Overnight low
17°
5th coldest
Rainfall
68 mm
11.1 wet days
Daylight
11 h 48 min
7:02 AM – 6:50 PM
Cloud cover
66%
5th clearest
Wind
6 km/h
4th windiest
Solar energy
5.13 kWh/m²
Travel score
6.4
out of 10

Kasulu is city in Kigoma, Tanzania.

Density
271/km²
people per km²
Founded
1500

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

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 26°C through the month.

A typical May day in Kasulu reaches about 26°C in the afternoon and slips back to 17°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 27°C. Set against its neighbours, May runs on par with April and on par with June.

15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12617
22617
32617
42617
52617
62617
72617
82617
92617
102617
112617
122617
132617
142617
152617
162617
172617
182617
192617
202617
212617
222617
232617
242617
252617
262617
272617
282617
292617
302617
312617

Kasulu weather by month

How May compares with the rest of the year at a glance. May is the 6th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan25° / 17°23528.312.23.8
Feb26° / 17°18924.312.14.0
Mar26° / 17°21427.3124.0
Apr25° / 17°17223.711.94.3
May26° / 17°6811.111.86.4
Jun27° / 16°14311.77.6
Jul27° / 16°30.811.87.9
Aug29° / 17°111.811.96.8
Sep29° / 18°366.4125.7
Oct28° / 18°1361712.14.9
Nov26° / 17°23125.512.24.0
Dec25° / 17°25728.912.33.8

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

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

Beyond those clear spells, partly cloudy skies cover about 23% of May, with mostly cloudy or overcast conditions the remaining 60%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12377
22575
32575
42773
52872
62971
73070
83169
93268
103367
113466
123565
133763
143862
154060
164060
174258
184258
194357
204456
214555
224555
234753
244852
254951
265050
275149
285248
295248
305446
315446

Chance of precipitation in May

Any precipitation

Kasulu gets around 68 mm of rain over 11.1 wet days in May. 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 63% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
163
261
359
457
556
654
752
849
947
1045
1142
1240
1338
1436
1534
1632
1730
1829
1927
2026
2125
2224
2323
2422
2521
2620
2719
2819
2918
3018
3117

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, May lands in the humid band about 65% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1098011
2098110
30108010
4011809
5011809
6012808
7013798
8014788
9015787
10017767
11018766
12020746
13022735
14025705
15027685
16029674
17031654
18033634
19035623
20136603
21138583
22140572
23142552
24244531
25345511
26346501
27447491
28547471
29648460
30748450
31848430

Wind in May

Winds average 6 km/h in May.

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

0246810151015202531
Wind speed (km/h)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 11 h 48 min at the start of May to 11 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 0 minutes over May. Sunrise moves from 7:02 AM to 7:04 AM, and sunset from 6:52 PM to 6:50 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.87:026:52
211.87:026:52
311.87:016:52
411.87:016:51
511.87:016:51
611.87:016:51
711.87:026:51
811.87:026:51
911.87:026:50
1011.87:026:50
1111.87:026:50
1211.87:026:50
1311.87:026:50
1411.87:026:50
1511.87:026:50
1611.87:026:50
1711.87:026:50
1811.87:026:49
1911.87:026:49
2011.87:036:49
2111.87:036:49
2211.87:036:49
2311.87:036:49
2411.87:036:49
2511.87:036:49
2611.87:036:49
2711.87:046:49
2811.87:046:49
2911.87:046:50
3011.87:046:50
3111.87:046:50

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.13 kWh/m².

For context, solar energy here swings from a low near 4.9 kWh/m² to a high of 6.25 kWh/m² in September across the year — May's 5.13 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.0Bright
25.0Bright
35.0Bright
45.0Bright
55.0Bright
65.0Bright
75.0Bright
85.0Bright
95.0Bright
105.0Bright
115.1Bright
125.1Bright
135.1Bright
145.1Bright
155.1Bright
165.1Bright
175.1Bright
185.2Bright
195.2Bright
205.2Bright
215.2Bright
225.2Bright
235.2Bright
245.3Bright
255.3Bright
265.3Bright
275.3Bright
285.3Bright
295.3Bright
305.3Bright
315.3Bright
Planning a trip in May

Hazard calendar for Kasulu

In seasonPeak

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

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

Kasulu's rainy season runs October–April, when most of the year's rain falls.

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

Is May a good time to visit Kasulu?

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

6.4
Sightseeing
4th-best month of the year
6.1
Beach & pool
5th-best month of the year

May is a reasonable time to visit Kasulu for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Kasulu in May

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

In May, Kasulu sees daytime highs around 26°C and nights near 17°C. Worth packing: light clothes, rain gear and sun protection. About 11 days see rain.

light clothesrain gearsun protection

UV index in Kasulu in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May 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 Kasulu peaks around March 14 at about 16 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near August 14 at about 8 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeMar 14UV 16Aug 14UV 8
UV index (midday)Level
Jan10Extreme
Feb15Extreme
Mar16Extreme
Apr15Extreme
May12Extreme
Jun10Very high
Jul11Extreme
Aug8Very high
Sep13Extreme
Oct14Extreme
Nov13Extreme
Dec12Extreme

Air quality in Kasulu in May

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where May falls, not just the annual average.

Air quality in Kasulu is worst in July — around 47 µg/m³ PM2.5 (poor), about 3.3× the cleanest month (April, 14 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0204060JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorModerateJul 2146 µg/m³Apr 1515 µg/m³
PM2.5 (µg/m³)Level
Jan20Moderate
Feb20Moderate
Mar17Moderate
Apr14Moderate
May18Moderate
Jun35Moderate
Jul47Poor
Aug43Poor
Sep36Poor
Oct23Moderate
Nov17Moderate
Dec16Moderate
Location & terrain

Where is Kasulu?

Kasulu sits at 4.6°S, 30.1°E, 1,310 m above sea level, in Tanzania. The nearest listed city is Mwandiga, 57 km away.

VyandaRumongeNgurukaGitegaKibondo

Topography around Kasulu

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

Within 3 km, the terrain around Kasulu has significant variations in elevation — a maximum elevation change of 288 m around an average of 1,320 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 629 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,720 m.

The land around Kasulu is covered by artificial surfaces (29%), cropland (27%) and trees (21%) within 3 km, grassland (49%) and cropland (28%) within 16 km, and grassland (35%), cropland (22%) and trees (21%) within 80 km.

3 km
288 m
16 km
629 m
80 km
1,720 m
treesshrubsgrasslandcroplandartificial surfaceswaterwetland
May weather nearby: Mwandiga 57 km · Kigoma 62 km · Uvinza 67 km · Vyanda 76 km · Rumonge 100 km · Nguruka 120 km · Gitega 129 km · Kibondo 130 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 Kasulu (-4.5767°, 30.1025°, elevation 1,310 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). UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).