Climate and average weather in Geiro

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

Best: late May to early November

Over the course of the year, the temperature in Geiro typically varies from 13°C to 26°C, and is rarely below 11°C or above 28°C. November is the hottest month of the year, while July is the coldest.

Based on the travel score, the best time of year to visit Geiro for warm-weather activities is from late May to early November.

Hottest
Nov
26°
Coldest
Jul
13°
Wettest
Jan
199 mm
Driest
Sep
11 mm
Rain / yr
1011 mm
160 wet days
Daylight
11.6–12.4 h
shortest–longest
Elevation
1,284 m
6.2°S
Clearest
Sep
48% cloud

Geiro 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 late May to early November.

Temperature through the year

Average highAverage lowShaded bands: 10–90% of days

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

Temperatures in Geiro stay fairly even through the year, without a distinct hot or cool season. The warmest month is November, with an average high of 26°C and low of 17°C; the coolest is July, with an average low of 13°C and high of 22°C.

Days typically run about 9°C warmer than nights, with the widest day–night swing (around 10°C) in September.

10°15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDec
Avg high (°C)Avg low (°C)
Jan2618
Feb2617
Mar2618
Apr2417
May2316
Jun2214
Jul2213
Aug2313
Sep2414
Oct2615
Nov2617
Dec2618

Average hourly temperature in Geiro

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 November afternoons, near 26°C, and coldest before dawn in July, near 13°C.

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

Geiro 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
Jan26° / 18°19920.812.35.0
Feb26° / 17°16316.812.25.2
Mar26° / 18°16922.5124.8
Apr24° / 17°11623.711.94.6
May23° / 16°5715.811.76.0
Jun22° / 14°176.711.77.2
Jul22° / 13°124.711.77.4
Aug23° / 13°166.211.87.4
Sep24° / 14°113.9128.0
Oct26° / 15°267.712.17.3
Nov26° / 17°6612.412.36.3
Dec26° / 18°16018.912.45.3

Chance of rain

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

Geiro gets about 1011 mm of precipitation a year. On a typical day the chance of rain is often wet, but that rises and falls sharply with the seasons.

The wetter season lasts 6.0 months, from around Nov 20 to May 21, peaking in April at about 83% chance on a given day. The drier stretch runs the rest of the year, bottoming out around Sep 18.

January is the wettest month by volume, with 199 mm over about 21 wet days; September is the driest, with 11 mm.

0%10%20%30%40%50%60%70%80%90%JanFebMarAprMayJunJulAugSepOctNovDecwetterdrierwettermostly drysome rainoften wetvery wetApr 4 · 83%Sep 18 · 12%
Rain on a day (%)Rain days
Jan6621
Feb6117
Mar7223
Apr7824
May5116
Jun237
Jul175
Aug196
Sep144
Oct258
Nov4112
Dec6119

Monthly rainfall

Over a full year, Geiro collects about 1011 mm of rain across 160 wet days — roughly 84 mm in an average month.

It doesn’t fall evenly. January is the wettest month with 199 mm, while September is the driest at just 11 mm. The three wettest months alone bring about 52% of the year’s total.

050100150200250JanFebMarAprMayJunJulAugSepOctNovDec19916316911657171216112666160
Rainfall (mm)Rain days
Jan19921
Feb16317
Mar16923
Apr11624
May5716
Jun177
Jul125
Aug166
Sep114
Oct268
Nov6612
Dec16019

Clouds and sunshine

ClearMostly clearPartly cloudyMostly cloudyOvercast

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

In Geiro, 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 August 9 and lasts for 4.1 months, ending around December 12. The clearest month is September, when the sky is clear, mostly clear, or partly cloudy 68% of the time on average.

The cloudier part of the year begins around December 13 and lasts for 5.2 months, ending around May 18. The cloudiest month is April, when it is overcast or mostly cloudy 71% 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%JanFebMarAprMayJunJulAugSepOctNovDecSep 23 · 73%Apr 7 · 26%clearmostly clearpartly cloudymostly cloudyovercastcloudierclearer
Clearer (%)Cloudier (%)
Jan3367
Feb3268
Mar3466
Apr2971
May4753
Jun5347
Jul5149
Aug5347
Sep6832
Oct6535
Nov5842
Dec4555

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. The longest day, around January 1, brings about 12 h 24 min of light; the shortest, around June 12, only 11 h 36 min — a swing of roughly 0 h 48 min.

12 AM4 AM8 AM12 PM4 PM8 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDec
Daylight (h)Sunrise (AM)Sunset (PM)
Jan12.36:326:51
Feb12.26:416:53
Mar12.06:416:43
Apr11.96:376:29
May11.76:376:20
Jun11.76:436:22
Jul11.76:486:28
Aug11.86:436:31
Sep12.06:286:26
Oct12.16:136:22
Nov12.36:096:26
Dec12.46:186:39

Sunny days

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

Geiro averages about 6 sunny days a month — counting the days the sky stays clear or mostly clear — with a clear seasonal swing between 1 and 12 days.

The sunnier stretch runs 4.1 months, from around Aug 15 to Dec 16. The sunniest month is September, with roughly 10 sunny days (mixed).

The greyest month is April, down near 2 sunny days — about 85% fewer than the September peak.

051015JanFebMarAprMayJunJulAugSepOctNovDecgreyersunniergloomymixedSep 2512 daysApr 191 days
Sunny daysSky
Jan4Gloomy
Feb5Gloomy
Mar4Gloomy
Apr2Gloomy
May4Gloomy
Jun6Gloomy
Jul7Gloomy
Aug6Gloomy
Sep10Mixed
Oct11Mixed
Nov8Mixed
Dec6Gloomy

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 Geiro, how humid it feels changes dramatically over the year.

The more humid part of the year lasts 6.0 months, from around November 12 to May 14. The muggiest month is March, when the air feels humid, muggy or worse about 95% of the time.

The most comfortable stretch runs from around May 15 to November 11, and July is the most comfortable month — the air is dry or comfortable 100% of the time.

0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecJul 22 · 100%Mar 31 · 2%muggycomfortablehumiddryhumidcomfortablehumid
Dry (%)Comfortable (%)Humid (%)Muggy (%)
Jan097516
Feb0117118
Mar057223
Apr097813
May946441
Jun504640
Jul792100
Aug693100
Sep554320
Oct2658160
Nov741503
Dec116767

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 Geiro is typically calm, near 10 km/h, and varies moderately with the seasons.

The windier part of the year lasts 7.4 months, from around Apr 16 to Nov 26. The windiest month is September, averaging about 13 km/h (light breeze).

The calmer part of the year runs from around Nov 27 to Apr 15, with January the calmest month at about 7 km/h.

05101520JanFebMarAprMayJunJulAugSepOctNovDeccalmerwindiercalmercalmlight breezeSep 25 · 13 km/hJan 17 · 7 km/h
Wind speed (km/h)Feels
Jan7calm
Feb7calm
Mar8calm
Apr10calm
May11calm
Jun11calm
Jul12calm
Aug12light breeze
Sep13light breeze
Oct13light breeze
Nov11calm
Dec8calm

Hazard calendar for Geiro

In seasonPeak

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

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

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

Best time to visit Geiro

TravelBeach/poolTemperatureCloudsPrecipitation

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

Around early June, Geiro 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 Geiro for general outdoor tourist activities is from late May to early November, with a peak score in the third week of September.

0246810JanFebMarAprMayJunJulAugSepOctNovDecbest timetravel scoretemperaturecloudsprecipitationSep 18 · 8.2

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
Jan5.0fair
Feb5.2fair
Mar4.8fair
Apr4.7fair
May6.0good
Jun7.2good
Jul7.3good
Aug7.4good
Sep8.0ideal
Oct7.3good
Nov6.3good
Dec5.3fair

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 Geiro for hot-weather activities is from late August to early December, with a peak score in the last week of September.

024681012JanFebMarAprMayJunJulAugSepOctNovDecbest timebeach/pool scoretemperaturecloudsprecipitationSep 23 · 7.1

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 Geiro, 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.

Geiro packs about the same all year — highs hold near 26°C. Across the year the things worth having are light clothes, rain gear and sun protection.

Light clothing
Warm layer
Winter coat
Rain gear
Sun protection
Windbreaker

In November, Geiro sees daytime highs around 26°C and nights near 17°C. Pack sun protection. Worth having: light clothes and rain gear. About 12 days see rain.

UV index (midday) in Geiro 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 Geiro peaks around March 11 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeMar 11UV 16Jun 17UV 10
UV index (midday)Level
Jan15Extreme
Feb16Extreme
Mar16Extreme
Apr15Extreme
May11Extreme
Jun10Extreme
Jul11Extreme
Aug11Extreme
Sep14Extreme
Oct14Extreme
Nov13Extreme
Dec13Extreme

Average hourly UV index in Geiro

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 March 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
Jun7.55
Jul7.55.5
Aug7.55.5
Sep86.5
Oct8.56.5
Nov8.56.5
Dec8.56.5
Almanac & agriculture

Growing season

Chance of a frost-free dayFrost-free year round

Geiro 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. Geiro banks about 3,671 degree days a year, and the running total — which growers use to time plantings and predict maturity — climbs fastest around December.

01,0002,0003,0004,000JanFebMarAprMayJunJulAugSepOctNovDec
Growing degree days (°C·days)
Jan364
Feb330
Mar360
Apr321
May290
Jun236
Jul222
Aug240
Sep269
Oct323
Nov347
Dec369

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.

Geiro receives about 5.8 kWh/m² a day of solar energy on average — bright — with a clear seasonal swing between 4.9 and 6.7 kWh/m².

The brighter stretch of the year lasts 6.6 months, from around Aug 31 to Mar 20. The brightest month is October, averaging about 6.7 kWh/m² (intense).

The dimmest month is May, down near 5.0 kWh/m² — roughly 25% less than the October peak.

012345678JanFebMarAprMayJunJulAugSepOctNovDecbrighterdimmerbrighterdimmoderatebrightintenseOct 246.7 kWhMay 164.9 kWh
Solar energy (kWh/m²)Level
Jan6.0Bright
Feb6.2Intense
Mar5.8Bright
Apr5.2Bright
May4.9Bright
Jun5.0Bright
Jul5.1Bright
Aug5.4Bright
Sep6.3Intense
Oct6.7Intense
Nov6.5Intense
Dec6.0Intense

Where is Geiro?

Geiro sits at 6.2°S, 36.9°E, 1,284 m above sea level, in Tanzania. The nearest listed city is Kibaigwa, 26 km away.

KilosaKibakwe

Topography around Geiro

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

Within 3 km, the terrain around Geiro has significant variations in elevation — a maximum elevation change of 458 m around an average of 1,295 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 845 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,016 m.

The land around Geiro is covered by cropland (69%) within 3 km, cropland (71%) within 16 km, and cropland (36%), trees (26%) and shrubs (25%) within 80 km.

3 km
458 m
16 km
845 m
80 km
2,016 m
treesshrubsgrasslandcroplandartificial surfaces
Nearby: Kibaigwa 26 km · Mpwapwa 48 km · Msowero 56 km · Dumila 59 km · Magole 61 km · Lubata 65 km · Kilosa 77 km · Kibakwe 84 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 Geiro (-6.15°, 36.8667°, elevation 1,284 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).