Usa River weather in May

In May, Usa River sees average daytime highs of 22°C and overnight lows near 14°C, with 50 mm of rain across 11.9 wet days and about 11.8 hours of daylight. It is the 9th-warmest and 7th-wettest month of the year here.

Day-to-day highs hold fairly steady near 22°C through the month. The sky is clear or mostly clear about 8% of the time in May, and the air most often feels comfortable.

Daylight stretches from about 11 h 54 min at the start of May to 11 h 48 min by month's end. Set against the rest of the year, May is Usa River's 10th-clearest and 5th-windiest month. For the whole year in context, see Usa River's year-round climate.

Daytime high
22°
9th warmest
Overnight low
14°
6th coldest
Rainfall
50 mm
11.9 wet days
Daylight
11 h 48 min
6:33 AM – 6:24 PM
Cloud cover
69%
10th clearest
Wind
7 km/h
5th windiest
Solar energy
4.58 kWh/m²
Travel score
6.2
out of 10

Usa River is human settlement in Tanzania.

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 22°C through the month.

A typical May day in Usa River reaches about 22°C in the afternoon and slips back to 14°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 20°C and 24°C. Set against its neighbours, May runs about 2°C cooler than April and about 1°C warmer than June.

10°15°20°25°151015202531
Avg high (°C)Avg low (°C)
12315
22315
32315
42315
52315
62315
72315
82315
92215
102215
112215
122215
132215
142214
152214
162214
172214
182214
192214
202214
212214
222214
232214
242213
252213
262213
272213
282213
292213
302213
312213

Usa River weather by month

How May compares with the rest of the year at a glance. May is the 9th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan26° / 15°8210.612.26.6
Feb27° / 15°738.912.16.5
Mar26° / 16°14316.7125.6
Apr24° / 16°14521.711.94.9
May22° / 14°5011.911.86.2
Jun21° / 12°72.311.87.3
Jul21° / 11°41.111.87.5
Aug22° / 11°41.111.97.8
Sep24° / 12°41.1128.3
Oct25° / 14°307.312.17.2
Nov25° / 15°10317.712.25.6
Dec25° / 15°10816.712.25.7

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 8% 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 70%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12575
22575
32575
42575
52575
62575
72674
82674
92773
102872
112971
122971
133070
143070
153268
163268
173268
183268
193268
203367
213466
223565
233565
243565
253565
263466
273565
283466
293466
303466
313466

Chance of precipitation in May

Any precipitation

Usa River gets around 50 mm of rain over 11.9 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 38% and peaks near 59% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
159
258
357
456
555
654
753
851
950
1048
1146
1245
1343
1442
1540
1638
1737
1835
1933
2031
2130
2228
2326
2425
2523
2622
2721
2820
2919
3018
3117

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, May lands in the comfortable band about 68% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
115544
215742
315841
416039
516138
616336
726434
826533
926731
1036928
1147026
1257124
1357322
1467420
1577419
1697417
17107515
18117514
19127612
20147511
21167410
2218739
2319738
2421727
2523716
2625705
2727685
2829674
2931654
3033634
3135623

Wind in May

Winds average 7 km/h in May.

Across May, daily wind ranges from about 7 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm
318calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 11 h 54 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 shrink by about 6 minutes over May. Sunrise moves from 6:33 AM to 6:35 AM, and sunset from 6:26 PM to 6:25 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.96:336:26
211.96:336:26
311.96:336:26
411.96:336:26
511.96:336:26
611.96:336:25
711.96:336:25
811.96:336:25
911.96:336:25
1011.96:336:25
1111.96:336:25
1211.96:336:25
1311.96:336:24
1411.96:336:24
1511.86:336:24
1611.86:336:24
1711.86:336:24
1811.86:346:24
1911.86:346:24
2011.86:346:24
2111.86:346:24
2211.86:346:24
2311.86:346:24
2411.86:346:24
2511.86:346:24
2611.86:356:24
2711.86:356:24
2811.86:356:24
2911.86:356:24
3011.86:356:25
3111.86:356:25

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 4.58 kWh/m².

For context, solar energy here swings from a low near 4.54 kWh/m² to a high of 6.33 kWh/m² in February across the year — May's 4.58 kWh/m² sits near the bottom.

024151015202531
Solar energy (kWh/m²)Level
14.6Bright
24.6Bright
34.6Bright
44.6Bright
54.6Bright
64.6Bright
74.6Bright
84.5Bright
94.5Bright
104.5Bright
114.5Bright
124.6Bright
134.6Bright
144.6Bright
154.6Bright
164.6Bright
174.6Bright
184.6Bright
194.6Bright
204.6Bright
214.6Bright
224.6Bright
234.6Bright
244.7Bright
254.7Bright
264.7Bright
274.7Bright
284.7Bright
294.7Bright
304.7Bright
314.7Bright
Planning a trip in May

Hazard calendar for Usa River

In seasonPeak

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

Usa River'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

Is May a good time to visit Usa River?

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

6.2
Sightseeing
8th-best month of the year
4.5
Beach & pool
10th-best month of the year

May is a reasonable time to visit Usa River for sightseeing.

What to pack for Usa River in May

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

In May, Usa River sees daytime highs around 22°C and nights near 14°C. Worth packing: light clothes, rain gear and sun protection. About 12 days see rain.

light clothesrain gearsun protection

UV index in Usa River 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 Usa River peaks around March 14 at about 16 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 19 at about 10 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeMar 14UV 16Jun 19UV 10
UV index (midday)Level
Jan15Extreme
Feb16Extreme
Mar16Extreme
Apr15Extreme
May12Extreme
Jun10Extreme
Jul11Extreme
Aug11Extreme
Sep14Extreme
Oct14Extreme
Nov14Extreme
Dec13Extreme

Air quality in Usa River 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 Usa River is worst in June — around 16 µg/m³ PM2.5 (moderate), about 1.7× the cleanest month (November, 10 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodJun 2316 µg/m³Nov 1210 µg/m³
PM2.5 (µg/m³)Level
Jan14Moderate
Feb13Moderate
Mar13Moderate
Apr12Moderate
May13Moderate
Jun16Moderate
Jul16Moderate
Aug13Moderate
Sep12Good
Oct11Good
Nov10Good
Dec13Moderate
Location & terrain

Where is Usa River?

Usa River sits at 3.4°S, 36.9°E, 1,197 m above sea level, in Tanzania. The nearest listed city is Kingori, 17 km away.

MakuyuniTarakea

Topography around Usa River

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

Within 3 km, the terrain around Usa River has significant variations in elevation — a maximum elevation change of 250 m around an average of 1,201 m above sea level; within 16 km, extreme variations in elevation — a maximum elevation change of 3,134 m; within 80 km, extreme variations in elevation — a maximum elevation change of 5,168 m.

The land around Usa River is covered by trees (62%) within 3 km, trees (48%) and cropland (23%) within 16 km, and grassland (39%) and shrubs (31%) within 80 km.

3 km
250 m
16 km
3,134 m
80 km
5,168 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
May weather nearby: Kingori 17 km · Arusha 19 km · Mbuguni 25 km · Merelani 26 km · Boma la Ngombe 34 km · Moshi 54 km · Makuyuni 86 km · Tarakea 89 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 Usa River (-3.3667°, 36.85°, elevation 1,197 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. 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).