Climate and average weather in Tumbi

In Tumbi, the weather is hot, wet, and partly cloudy and remarkably steady, with daytime highs holding near hot levels all year. The wettest stretch peaks around December.

Best: mid April to early September

Over the course of the year, the temperature in Tumbi typically varies from 17°C to 32°C, and is rarely below 15°C or above 34°C. October is the hottest month of the year, while January is the coldest.

Based on the travel score, the best time of year to visit Tumbi for warm-weather activities is from mid April to early September.

Hottest
Oct
32°
Coldest
Jan
19°
Wettest
Dec
155 mm
Driest
Jul
0 mm
Rain / yr
757 mm
105 wet days
Daylight
11.7–12.3 h
shortest–longest
Elevation
1,168 m
5.1°S
Clearest
Jul
41% cloud

Tumbi weather by month, at a glance

The whole year in one picture — sky, rain, humidity, temperature and travel score. Click any band to jump to its full chart.

Each stripe is one measure across the whole year, stacked so a single day reads top to bottom. The sky band runs overcast grey on top down to clear blue at the base — more blue means sunnier — followed by the rainfall curve, the humidity band, a temperature strip that tints each stretch of the year by how warm its average high is, and the travel-score line at the foot. Scan straight down any date to read that day across every measure at once; the score climbs highest around mid April to early September.

Temperature through the year

Average highAverage lowShaded bands: 10–90% of days

Daily average highs and lows in Tumbi, from 1991–2020 of climate data. The shaded bands show the range most days fall in — 10th to 90th percentile.

Temperatures in Tumbi stay fairly even through the year, without a distinct hot or cool season. The warmest month is October, with an average high of 32°C and low of 21°C; the coolest is January, with an average low of 19°C and high of 28°C.

Days typically run about 10°C warmer than nights year-round.

15°20°25°30°35°JanFebMarAprMayJunJulAugSepOctNovDec
Avg high (°C)Avg low (°C)
Jan2819
Feb2819
Mar2819
Apr2819
May2919
Jun2918
Jul2917
Aug3018
Sep3120
Oct3221
Nov3020
Dec2819

Average hourly temperature in Tumbi

A compact picture of the whole year, hour by hour: each column is a day, each row an hour, and the color is the modeled average temperature. Darker overlays mark night, lighter ones the civil-twilight hours around sunrise and sunset.

Read left to right for the day of the year and top to bottom for the hour of the day; the color is the modeled temperature, cool blues through to hot reds on the same scale as the other charts. A vertical slice is a single day's swing — coolest just before dawn, warmest in the mid-afternoon — while a horizontal slice follows one hour across the seasons. The darker overlay marks night and the lighter one the twilight around sunrise and sunset. Colors run warmest on October afternoons, near 32°C, and coldest before dawn in January, near 19°C.

JanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AM

Tumbi weather by month

Every month at a glance. Click a month for its detailed page.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 19°15220.912.34.7
Feb28° / 19°11316.412.24.8
Mar28° / 19°12917.1125.0
Apr28° / 19°8012.211.95.8
May29° / 19°142.911.86.7
Jun29° / 18°00.111.77.0
Jul29° / 17°0011.77.2
Aug30° / 18°10.211.86.4
Sep31° / 20°20.4125.5
Oct32° / 21°183.112.14.8
Nov30° / 20°9411.612.24.7
Dec28° / 19°15519.712.34.7

Chance of rain

How likely it is to rain on a typical day, and how that shifts across the wetter and drier seasons.

Tumbi gets about 757 mm of precipitation a year. On a typical day the chance of rain is some rain, but that rises and falls sharply with the seasons.

The wetter season lasts 5.5 months, from around Nov 8 to Apr 23, peaking in January at about 69% chance on a given day. The drier stretch runs the rest of the year, bottoming out around Jun 15.

December is the wettest month by volume, with 155 mm over about 20 wet days; July is the driest, with 0 mm.

0%10%20%30%40%50%60%70%80%JanFebMarAprMayJunJulAugSepOctNovDecwetterdrierwettermostly drysome rainoften wetvery wetJan 9 · 69%Jun 15 · 0%
Rain on a day (%)Rain days
Jan6621
Feb5916
Mar5517
Apr4112
May103
Jun00
Jul00
Aug10
Sep20
Oct113
Nov3812
Dec6320

Monthly rainfall

Over a full year, Tumbi collects about 757 mm of rain across 105 wet days — roughly 63 mm in an average month.

It doesn’t fall evenly. December is the wettest month with 155 mm, while July is the driest at just 0 mm. The three wettest months alone bring about 58% of the year’s total.

0255075100125150175200JanFebMarAprMayJunJulAugSepOctNovDec152113129801400121894155
Rainfall (mm)Rain days
Jan15221
Feb11316
Mar12917
Apr8012
May143
Jun00
Jul00
Aug10
Sep20
Oct183
Nov9412
Dec15520

Clouds and sunshine

ClearMostly clearPartly cloudyMostly cloudyOvercast

How often the daytime sky is clear, partly cloudy or overcast.

In Tumbi, the average share of the sky covered by clouds shows significant seasonal variation over the course of the year.

The clearer part of the year begins around May 3 and lasts for 5.8 months, ending around October 25. The clearest month is September, when the sky is clear, mostly clear, or partly cloudy 74% of the time on average.

The cloudier part of the year begins around October 26 and lasts for 6.2 months, ending around May 2. The cloudiest month is January, when it is overcast or mostly cloudy 69% of the time.

0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JanFebMarAprMayJunJulAugSepOctNovDecAug 31 · 75%Jan 12 · 30%clearmostly clearpartly cloudymostly cloudyovercastcloudierclearercloudier
Clearer (%)Cloudier (%)
Jan3169
Feb3268
Mar3961
Apr4258
May6139
Jun6535
Jul7129
Aug7129
Sep7426
Oct5842
Nov4357
Dec3565

Daylight, sunrise and sunset

DaylightNight

Hours of daylight through the year, with sunrise and sunset times.

The gold band is daylight — sunrise runs along its lower edge, sunset along the upper — so it widens toward summer and pinches toward winter, with night the dark area above and below. Close to the equator, Tumbi barely changes through the year: days stay near 12 h 18 min of light in every season.

12 AM4 AM8 AM12 PM4 PM8 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDec
Daylight (h)Sunrise (AM)Sunset (PM)
Jan12.36:507:06
Feb12.26:597:09
Mar12.06:587:00
Apr11.96:536:46
May11.86:526:38
Jun11.76:586:41
Jul11.77:036:47
Aug11.86:586:48
Sep12.06:446:43
Oct12.16:316:38
Nov12.26:276:41
Dec12.36:366:54

Sunny days

How many genuinely sunny days each month brings — days the sky stays clear or mostly clear — banded into plain-language zones.

Tumbi averages about 9 sunny days a month — counting the days the sky stays clear or mostly clear — with a clear seasonal swing between 4 and 16 days.

The sunnier stretch runs 5.2 months, from around May 11 to Oct 16. The sunniest month is September, with roughly 16 sunny days (bright).

The greyest month is January, down near 4 sunny days — about 72% fewer than the September peak.

05101520JanFebMarAprMayJunJulAugSepOctNovDecgreyersunniergreyergloomymixedbrightSep 1816 daysJan 94 days
Sunny daysSky
Jan4Gloomy
Feb5Gloomy
Mar6Gloomy
Apr6Gloomy
May11Mixed
Jun13Mixed
Jul15Mixed
Aug15Mixed
Sep15Bright
Oct10Mixed
Nov6Gloomy
Dec5Gloomy

Humidity comfort

DryComfortableHumidMuggyOppressiveMiserable

Share of days at each humidity comfort level, based on the dew point — the measure that tracks how muggy it actually feels.

Humidity comfort is graded by the dew point — the temperature at which the air would be fully saturated — because it tracks how muggy it actually feels far better than relative humidity does. A low dew point feels dry and crisp; a high one feels sticky and oppressive no matter the reading on a humidity gauge.

In Tumbi, how humid it feels changes dramatically over the year.

The more humid part of the year lasts 5.8 months, from around November 14 to May 8. The muggiest month is January, when the air feels humid, muggy or worse about 95% of the time.

The most comfortable stretch runs from around May 9 to November 13, and June is the most comfortable month — the air is dry or comfortable 99% of the time.

0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecJun 26 · 100%Jan 15 · 4%muggycomfortabledryhumidhumidcomfortablehumid
Dry (%)Comfortable (%)Humid (%)Muggy (%)
Jan155044
Feb184743
Mar094843
Apr1165527
May2746243
Jun841510
Jul98200
Aug98200
Sep95310
Oct731691
Nov29243710
Dec4145131

Wind

Average wind speed through the year, banded into plain-language speed zones so a number reads as 'breezy' or 'calm' without knowing the scale.

This is the average sustained wind speed at the standard 10 metres above open ground — the steady flow a weather station reports, not the sharper gusts that come and go, which can run half again as fast. It's the number that says whether a place is generally breezy or calm.

Across the year, average wind speed in Tumbi is typically calm, near 10 km/h, and varies moderately with the seasons.

The windier part of the year lasts 6.4 months, from around Apr 24 to Nov 4. The windiest month is September, averaging about 13 km/h (light breeze).

The calmer part of the year runs from around Nov 5 to Apr 23, with January the calmest month at about 6 km/h.

05101520JanFebMarAprMayJunJulAugSepOctNovDeccalmerwindiercalmercalmlight breezeSep 20 · 14 km/hJan 13 · 6 km/h
Wind speed (km/h)Feels
Jan6calm
Feb6calm
Mar7calm
Apr9calm
May11calm
Jun12calm
Jul13light breeze
Aug13light breeze
Sep13light breeze
Oct12light breeze
Nov8calm
Dec6calm

Hazard calendar for Tumbi

In seasonPeak

When the seasonal hazards worth planning around — the rainy season, tropical-cyclone risk and dust haze — are active through the year.

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

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

Best time to visit Tumbi

TravelBeach/poolTemperatureCloudsPrecipitation

To characterize how pleasant the weather is in Tumbi throughout the year, we compute two travel scores — one for general sightseeing, one for beach and pool weather.

Around late April, Tumbi is still near the start of its best-weather window — great conditions with the peak-season crowds not yet at full swing.

Inferred from the travel-score curve; month-by-month visitor numbers are a planned addition.

The travel score favors clear, rainless days with daytime highs between 18°C and 28°C. Based on this score, the best time of year to visit Tumbi for general outdoor tourist activities is from mid April to early September, with a peak score in the second week of July.

0246810JanFebMarAprMayJunJulAugSepOctNovDecbest timetravel scoretemperaturecloudsprecipitationJul 8 · 7.3

The travel score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

Travel score (0–10)Rating
Jan4.7fair
Feb4.8fair
Mar5.0fair
Apr5.8good
May6.7good
Jun7.0good
Jul7.2good
Aug6.4good
Sep5.5good
Oct4.8fair
Nov4.7fair
Dec4.8fair

The beach/pool score favors clear, rainless days with daytime highs between 24°C and 34°C. Based on this score, the best time of year to visit Tumbi for hot-weather activities is from late April to late October, with a peak score in the third week of July.

024681012JanFebMarAprMayJunJulAugSepOctNovDecbest timebeach/pool scoretemperaturecloudsprecipitationJul 20 · 8.9

The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

What to pack for Tumbi, by month

EssentialRecommendedOptional

Month by month, what's worth putting in the bag — from the temperature range, rain chance, sun and wind. Tap a month for a quick packing note.

Tumbi packs about the same all year — highs hold near 32°C. Across the year the things worth having are light clothes, sun protection and rain gear.

Light clothing
Warm layer
Winter coat
Rain gear
Sun protection
Windbreaker

In October, Tumbi sees daytime highs around 32°C and nights near 21°C. Pack light clothes and sun protection. About 3 days see rain.

UV index (midday) in Tumbi by month

LowModerateHighVery highExtreme

Clear-sky midday UV index through the year, shaded by the WHO exposure levels — how much sun protection each month calls for.

Under clear skies, the midday UV index in Tumbi peaks around February 22 at about 16 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 17 at about 10 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeFeb 22UV 16Jun 17UV 10
UV index (midday)Level
Jan13Extreme
Feb16Extreme
Mar16Extreme
Apr15Extreme
May11Extreme
Jun10Very high
Jul11Extreme
Aug11Extreme
Sep13Extreme
Oct14Extreme
Nov13Extreme
Dec13Extreme

Average hourly UV index in Tumbi

LowModerateHighVery highExtreme

Modeled clear-sky UV for every hour of every day — when in the day sun protection actually matters.

The whole year hour by hour: each column is a day, each row an hour, and the color is the modeled clear-sky UV index — the midday peak scaled down as the sun sits lower in the sky. Darker overlays mark night, lighter ones the civil-twilight hours around sunrise and sunset.

UV falls off far faster than brightness as the sun drops, so even in February the burn window is concentrated in the middle of the day: about 8.5 hours a day reach index 3 (protection recommended), and 7 hours reach 6 or more. Mornings and late afternoons stay comparatively gentle year round.

JanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AM
UV ≥ 3 (h/day)UV ≥ 6 (h/day)
Jan8.56.5
Feb8.57
Mar8.57
Apr86.5
May7.55.5
Jun75
Jul7.55.5
Aug7.55.5
Sep86
Oct86.5
Nov86.5
Dec8.56.5
Almanac & agriculture

Growing season

Chance of a frost-free dayFrost-free year round

Tumbi is frost-free year round — even the coldest nights rarely reach freezing, so there is no start or end to the growing season.

0%25%50%75%100%JanFebMarAprMayJunJulAugSepOctNovDecfrost-free year round
Frost-free chance (%)Frost nights
Jan1000
Feb1000
Mar1000
Apr1000
May1000
Jun1000
Jul1000
Aug1000
Sep1000
Oct1000
Nov1000
Dec1000

Growing degree days

Degree days (base 10°C)Frost-free shaded

Growing degree days tally heat above 10°C: each day adds however many degrees its average temperature runs over that threshold, and cold days add nothing. Tumbi banks about 5,129 degree days a year, and the running total — which growers use to time plantings and predict maturity — climbs fastest around October.

02,0004,000JanFebMarAprMayJunJulAugSepOctNovDec
Growing degree days (°C·days)
Jan409
Feb380
Mar421
Apr402
May428
Jun403
Jul404
Aug438
Sep465
Oct505
Nov454
Dec420

Solar energy

Average daily shortwave solar energy reaching the ground, banded into brightness zones so the number means something at a glance.

Solar energy is how much sunlight actually reaches the ground each day, measured in kilowatt-hours per square metre (kWh/m²) — the combined effect of how long the sun is up, how high it climbs, and how much cloud gets in the way. It's the raw fuel a solar panel has to work with: for scale, 1 kWh/m² a day is dim and wintry, while 7+ is desert-bright.

Tumbi receives about 6.1 kWh/m² a day of solar energy — intense — and it stays remarkably steady, holding between 5.5 and 7.0 kWh/m² all year. For solar panels, output here is a flat line, not a seasonal wave.

012345678JanFebMarAprMayJunJulAugSepOctNovDecdimmoderatebrightintenseSep 287.0 kWhDec 195.5 kWh
Solar energy (kWh/m²)Level
Jan5.7Bright
Feb6.1Intense
Mar6.0Intense
Apr5.7Bright
May5.7Bright
Jun5.8Bright
Jul6.1Intense
Aug6.4Intense
Sep6.9Intense
Oct6.8Intense
Nov6.1Intense
Dec5.5Bright

Where is Tumbi?

Tumbi sits at 5.1°S, 32.7°E, 1,168 m above sea level, in Tanzania. The nearest listed city is Tabora, 12 km away.

UramboNzegaIsakaKahamaTinde

Topography around Tumbi

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

Within 3 km, the terrain around Tumbi has only modest variations in elevation — a maximum elevation change of 134 m around an average of 1,188 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 230 m; within 80 km, significant variations in elevation — a maximum elevation change of 335 m.

The land around Tumbi is covered by shrubs (46%) and cropland (36%) within 3 km, shrubs (44%) and cropland (30%) within 16 km, and cropland (42%), shrubs (27%) and trees (26%) within 80 km.

3 km
134 m
16 km
230 m
80 km
335 m
treesshrubsgrasslandcroplandartificial surfaces
Nearby: Tabora 12 km · Mabama 23 km · Sikonge 63 km · Urambo 76 km · Nzega 107 km · Isaka 132 km · Kahama 138 km · Tinde 141 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 Tumbi (-5.0667°, 32.7333°, elevation 1,168 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. 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).