Waterloo weather in August

In August, Waterloo sees average daytime highs of 26°C and overnight lows near 24°C, with 705 mm of rain across 29.7 wet days and about 12.3 hours of daylight. It is the 12th-warmest and 1st-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 0% of the time in August, and the air most often feels oppressive.

Daylight stretches from about 12 h 24 min at the start of August to 12 h 12 min by month's end. Set against the rest of the year, August is Waterloo's 12th-clearest and 1st-windiest month. For the whole year in context, see Waterloo's year-round climate.

Daytime high
26°
12th warmest
Overnight low
24°
1st coldest
Rainfall
705 mm
29.7 wet days
Daylight
12 h 18 min
6:48 AM – 7:05 PM
Cloud cover
90%
12th clearest
Wind
12 km/h
1st windiest
Solar energy
3.6 kWh/m²
Travel score
3.4
out of 10

Waterloo is city in Sierra Leone.

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

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

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

A typical August day in Waterloo reaches about 26°C in the afternoon and slips back to 24°C overnight — a 3°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, August runs on par with July and on par with September.

20°23°25°28°30°151015202531
Avg high (°C)Avg low (°C)
12624
22624
32624
42624
52624
62624
72624
82624
92624
102624
112624
122624
132624
142624
152624
162624
172624
182624
192624
202624
212624
222724
232724
242724
252724
262724
272724
282724
292724
302724
312724

How August really feels in Waterloo

Once humidity and wind are folded in, August 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

August sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Waterloo weather by month

How August compares with the rest of the year at a glance. August is the 12th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 24°164.111.66.2
Feb30° / 25°112.211.76.0
Mar30° / 25°204.711.95.6
Apr30° / 25°478.412.25.0
May29° / 25°21625.212.43.5
Jun28° / 24°42629.712.53.2
Jul27° / 24°60629.912.43.4
Aug26° / 24°70529.712.33.4
Sep27° / 24°50129.4123.3
Oct28° / 24°26629.611.83.3
Nov29° / 24°13024.811.63.7
Dec29° / 25°4211.111.55.5

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 0% of the time in August, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 3% of August, with mostly cloudy or overcast conditions the remaining 97%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
1397
2397
3397
4397
5397
6397
7397
8397
9397
10397
11397
12397
13397
14397
15397
16397
17397
18397
19397
20397
21397
22397
23397
24397
25397
26496
27496
28496
29496
30496
31496

Chance of precipitation in August

Any precipitation

Waterloo gets around 705 mm of rain over 29.7 wet days in August, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 96% and peaks near 98% on the wettest days.

0%20%40%60%80%100%151015202531
Rain chance (%)
194
294
395
495
595
695
795
895
995
1095
1195
1295
1395
1495
1595
1696
1796
1896
1996
2096
2196
2297
2397
2497
2597
2698
2798
2898
2998
3098
3198

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the oppressive band about 99% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Muggy (%)Oppressive (%)
1298
2298
3298
4298
5298
6298
7199
8199
9199
10199
11199
12199
13199
14199
15199
16199
17199
18199
19199
20199
21199
220100
230100
240100
250100
260100
270100
280100
290100
300100
310100

Wind in August

Winds average 12 km/h in August, the windiest month of the year.

Across August, daily wind ranges from about 11 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
112light breeze
212light breeze
312light breeze
412light breeze
512light breeze
613light breeze
713light breeze
813light breeze
913light breeze
1012light breeze
1112light breeze
1212light breeze
1312light breeze
1412light breeze
1512light breeze
1612light breeze
1712light breeze
1812light breeze
1912light breeze
2012light breeze
2112calm
2212calm
2312calm
2412calm
2512calm
2611calm
2711calm
2811calm
2911calm
3011calm
3111calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 12 h 24 min at the start of August to 12 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 12 minutes over August. Sunrise moves from 6:47 AM to 6:47 AM, and sunset from 7:09 PM to 6:57 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.46:477:09
212.46:477:09
312.46:477:09
412.46:487:09
512.36:487:08
612.36:487:08
712.36:487:08
812.36:487:08
912.36:487:07
1012.36:487:07
1112.36:487:07
1212.36:487:06
1312.36:487:06
1412.36:487:05
1512.36:487:05
1612.36:487:05
1712.36:487:04
1812.36:487:04
1912.36:487:03
2012.26:487:03
2112.26:487:02
2212.26:487:02
2312.26:487:02
2412.26:487:01
2512.26:487:01
2612.26:487:00
2712.26:487:00
2812.26:486:59
2912.26:476:58
3012.26:476:58
3112.26:476:57

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 3.6 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 3.6 kWh/m² to a high of 6.01 kWh/m² in March across the year — August's 3.6 kWh/m² sits near the bottom.

01234151015202531
Solar energy (kWh/m²)Level
13.5Moderate
23.5Moderate
33.5Moderate
43.5Moderate
53.5Moderate
63.5Moderate
73.5Moderate
83.5Moderate
93.5Moderate
103.5Moderate
113.5Moderate
123.5Moderate
133.5Moderate
143.5Moderate
153.5Moderate
163.5Moderate
173.6Moderate
183.6Moderate
193.6Moderate
203.6Moderate
213.6Moderate
223.7Moderate
233.7Moderate
243.7Moderate
253.7Moderate
263.7Moderate
273.8Moderate
283.8Moderate
293.8Moderate
303.8Moderate
313.8Moderate
Planning a trip in August

Hazard calendar for Waterloo

In seasonPeak

In August, Waterloo sits inside its monsoon season. The full year is below, with each hazard's peak months called out.

Waterloo's monsoon runs June–September, when most of the year's rain falls.

Waterloo sees seasonal dust haze (February–April), heaviest in February.

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

Is August a good time to visit Waterloo?

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

3.4
Sightseeing
8th-best month of the year
3.4
Beach & pool
12th-best month of the year

August is a weaker month for outdoor sightseeing in Waterloo.

What to pack for Waterloo in August

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

In August, Waterloo sees daytime highs around 26°C and nights near 24°C. Pack rain gear. Worth having: light clothes. About 30 days see rain.

rain gearlight clothes

Sea temperature near Waterloo in August

The nearest coast averages about 27°C in August — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 25 km away) is warmest in May at about 29°C and coldest in August near 27°C.

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

26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan28Warm
Feb28Warm
Mar28Warm
Apr28Warm
May29Tropical
Jun28Tropical
Jul27Warm
Aug27Warm
Sep27Warm
Oct28Warm
Nov29Tropical
Dec29Tropical

UV index in Waterloo in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August 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 Waterloo peaks around August 20 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 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 highAug 20UV 13Dec 15UV 8
UV index (midday)Level
Jan9Very high
Feb12Extreme
Mar12Extreme
Apr11Extreme
May12Extreme
Jun12Extreme
Jul11Extreme
Aug13Extreme
Sep12Extreme
Oct11Extreme
Nov9Very high
Dec8Very high

Air quality in Waterloo in August

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Waterloo is worst in April — around 217 µg/m³ PM2.5 (very unhealthy), about 19.6× the cleanest month (August, 11 µg/m³).

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

0306090120150180210JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyVery unhealthyUnhealthyModerateGoodModeratePoorApr 14200 µg/m³Aug 2011 µg/m³
PM2.5 (µg/m³)Level
Jan72Unhealthy
Feb78Unhealthy
Mar106Unhealthy
Apr217Very unhealthy
May43Poor
Jun20Moderate
Jul14Moderate
Aug11Good
Sep12Moderate
Oct18Moderate
Nov27Moderate
Dec54Poor
Location & terrain

Where is Waterloo?

Waterloo sits at 8.3°N, 13.1°W, 23 m above sea level, in Sierra Leone. The nearest listed city is Freetown, 24 km away.

FreetownGoderichPort LokoLunsarMile 91NjalaForécariahMakeni

Topography around Waterloo

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

Within 3 km, the terrain around Waterloo has significant variations in elevation — a maximum elevation change of 419 m around an average of 52 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 899 m; within 80 km, large variations in elevation — a maximum elevation change of 885 m.

The land around Waterloo is covered by artificial surfaces (46%), grassland (23%) and trees (20%) within 3 km, trees (48%) within 16 km, and water (41%) and trees (39%) within 80 km.

3 km
419 m
16 km
899 m
80 km
885 m
treesshrubsgrasslandartificial surfaceswaterwetlandmangroves
August weather nearby: Freetown 24 km · Goderich 26 km · Port Loko 57 km · Lunsar 70 km · Mile 91 95 km · Njala 117 km · Forécariah 121 km · Makeni 128 km

Sierra Leone travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type D / G
230 V · 50 Hz
Prices
≈ 24% of US
price level, 2025
GDP per capita
$846
2025
Happiness
3.3 / 10
World Happiness, 2025
Safe drinking water
11%
of population, 2024
Homicide rate
2.2
per 100k, 2020
Road deaths
33
per 100k/yr, 2019
Income group
Low
World Bank
Religion
Muslim 77%Christian 23%

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 Waterloo (8.3389°, -13.0709°, elevation 23 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. 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. 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).