Waterloo weather in May
In May, Waterloo sees average daytime highs of 29°C and overnight lows near 25°C, with 216 mm of rain across 25.2 wet days and about 12.4 hours of daylight. It is the 6th-warmest and 6th-wettest month of the year here.
Day-to-day highs hold fairly steady near 29°C through the month. The sky is clear or mostly clear about 3% of the time in May, and the air most often feels miserable.
Daylight stretches from about 12 h 18 min at the start of May to 12 h 24 min by month's end. Set against the rest of the year, May is Waterloo's 8th-clearest and 9th-windiest month. For the whole year in context, see Waterloo's year-round climate.
- Daytime high
- 29°
- 6th warmest
- Overnight low
- 25°
- 11th coldest
- Rainfall
- 216 mm
- 25.2 wet days
- Daylight
- 12 h 24 min
- 6:37 AM – 7:00 PM
- Cloud cover
- 81%
- 8th clearest
- Wind
- 8 km/h
- 9th windiest
- Solar energy
- 4.78 kWh/m²
- Travel score
- 3.5
- out of 10
Waterloo is city in Sierra Leone.
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in May
Day-to-day highs hold fairly steady near 29°C through the month.
A typical May day in Waterloo reaches about 29°C in the afternoon and slips back to 25°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 30°C. Set against its neighbours, May runs about 1°C cooler than April and about 1°C warmer than June.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 30 | 30 | 30 | 30 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 28 | 28 | 28 |
| Avg low (°C) | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 30 | 25 |
| 2 | 30 | 25 |
| 3 | 30 | 25 |
| 4 | 30 | 25 |
| 5 | 29 | 25 |
| 6 | 29 | 25 |
| 7 | 29 | 25 |
| 8 | 29 | 25 |
| 9 | 29 | 25 |
| 10 | 29 | 25 |
| 11 | 29 | 25 |
| 12 | 29 | 25 |
| 13 | 29 | 25 |
| 14 | 29 | 25 |
| 15 | 29 | 25 |
| 16 | 29 | 25 |
| 17 | 29 | 25 |
| 18 | 29 | 25 |
| 19 | 29 | 25 |
| 20 | 29 | 25 |
| 21 | 29 | 25 |
| 22 | 29 | 25 |
| 23 | 29 | 25 |
| 24 | 29 | 25 |
| 25 | 29 | 25 |
| 26 | 29 | 25 |
| 27 | 29 | 25 |
| 28 | 29 | 25 |
| 29 | 28 | 25 |
| 30 | 28 | 25 |
| 31 | 28 | 25 |
How May really feels in Waterloo
Once humidity and wind are folded in, May averages 31 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.
The story in May is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Waterloo weather by month
How May compares with the rest of the year at a glance. May is the 6th-warmest and 6th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 30° / 24° | 16 | 4.1 | 11.6 | 6.2 |
| Feb | 30° / 25° | 11 | 2.2 | 11.7 | 6.0 |
| Mar | 30° / 25° | 20 | 4.7 | 11.9 | 5.6 |
| Apr | 30° / 25° | 47 | 8.4 | 12.2 | 5.0 |
| May | 29° / 25° | 216 | 25.2 | 12.4 | 3.5 |
| Jun | 28° / 24° | 426 | 29.7 | 12.5 | 3.2 |
| Jul | 27° / 24° | 606 | 29.9 | 12.4 | 3.4 |
| Aug | 26° / 24° | 705 | 29.7 | 12.3 | 3.4 |
| Sep | 27° / 24° | 501 | 29.4 | 12 | 3.3 |
| Oct | 28° / 24° | 266 | 29.6 | 11.8 | 3.3 |
| Nov | 29° / 24° | 130 | 24.8 | 11.6 | 3.7 |
| Dec | 29° / 25° | 42 | 11.1 | 11.5 | 5.5 |
Cloud cover in May
The sky is clear or mostly clear about 3% of the time in May.
Beyond those clear spells, partly cloudy skies cover about 14% of May, with mostly cloudy or overcast conditions the remaining 83%. Skies tend to cloud over as the month goes on.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 32 | 31 | 30 | 29 | 27 | 26 | 24 | 23 | 22 | 21 | 20 | 20 | 18 | 17 | 17 | 16 | 15 | 14 | 13 | 13 | 12 | 11 | 10 | 9 | 9 | 8 | 8 | 8 | 7 | 7 | 7 |
| Cloudier (%) | 68 | 69 | 70 | 71 | 73 | 74 | 76 | 77 | 78 | 79 | 80 | 80 | 82 | 83 | 83 | 84 | 85 | 86 | 87 | 87 | 88 | 89 | 90 | 91 | 91 | 92 | 92 | 92 | 93 | 93 | 93 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 32 | 68 |
| 2 | 31 | 69 |
| 3 | 30 | 70 |
| 4 | 29 | 71 |
| 5 | 27 | 73 |
| 6 | 26 | 74 |
| 7 | 24 | 76 |
| 8 | 23 | 77 |
| 9 | 22 | 78 |
| 10 | 21 | 79 |
| 11 | 20 | 80 |
| 12 | 20 | 80 |
| 13 | 18 | 82 |
| 14 | 17 | 83 |
| 15 | 17 | 83 |
| 16 | 16 | 84 |
| 17 | 15 | 85 |
| 18 | 14 | 86 |
| 19 | 13 | 87 |
| 20 | 13 | 87 |
| 21 | 12 | 88 |
| 22 | 11 | 89 |
| 23 | 10 | 90 |
| 24 | 9 | 91 |
| 25 | 9 | 91 |
| 26 | 8 | 92 |
| 27 | 8 | 92 |
| 28 | 8 | 92 |
| 29 | 7 | 93 |
| 30 | 7 | 93 |
| 31 | 7 | 93 |
Chance of precipitation in May
Waterloo gets around 216 mm of rain over 25.2 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 80% and peaks near 95% on the wettest days. The odds climb toward the end of the month.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 53 | 56 | 58 | 61 | 63 | 66 | 68 | 70 | 72 | 74 | 76 | 77 | 79 | 81 | 82 | 84 | 85 | 87 | 88 | 89 | 90 | 90 | 91 | 92 | 92 | 93 | 93 | 94 | 94 | 94 | 95 |
| Rain chance (%) | |
|---|---|
| 1 | 53 |
| 2 | 56 |
| 3 | 58 |
| 4 | 61 |
| 5 | 63 |
| 6 | 66 |
| 7 | 68 |
| 8 | 70 |
| 9 | 72 |
| 10 | 74 |
| 11 | 76 |
| 12 | 77 |
| 13 | 79 |
| 14 | 81 |
| 15 | 82 |
| 16 | 84 |
| 17 | 85 |
| 18 | 87 |
| 19 | 88 |
| 20 | 89 |
| 21 | 90 |
| 22 | 90 |
| 23 | 91 |
| 24 | 92 |
| 25 | 92 |
| 26 | 93 |
| 27 | 93 |
| 28 | 94 |
| 29 | 94 |
| 30 | 94 |
| 31 | 95 |
Humidity in May
Most of May feels miserable — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, May lands in the miserable band about 62% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Muggy (%) | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Oppressive (%) | 41 | 39 | 38 | 37 | 36 | 35 | 34 | 33 | 32 | 32 | 31 | 31 | 31 | 31 | 31 | 31 | 32 | 32 | 33 | 34 | 35 | 37 | 38 | 40 | 42 | 44 | 47 | 49 | 51 | 54 | 56 |
| Miserable (%) | 58 | 60 | 61 | 62 | 63 | 64 | 66 | 67 | 68 | 68 | 69 | 69 | 69 | 69 | 69 | 69 | 68 | 68 | 67 | 66 | 65 | 63 | 62 | 60 | 58 | 56 | 53 | 51 | 49 | 46 | 44 |
| Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|
| 1 | 1 | 41 | 58 |
| 2 | 1 | 39 | 60 |
| 3 | 1 | 38 | 61 |
| 4 | 1 | 37 | 62 |
| 5 | 1 | 36 | 63 |
| 6 | 1 | 35 | 64 |
| 7 | 0 | 34 | 66 |
| 8 | 0 | 33 | 67 |
| 9 | 0 | 32 | 68 |
| 10 | 0 | 32 | 68 |
| 11 | 0 | 31 | 69 |
| 12 | 0 | 31 | 69 |
| 13 | 0 | 31 | 69 |
| 14 | 0 | 31 | 69 |
| 15 | 0 | 31 | 69 |
| 16 | 0 | 31 | 69 |
| 17 | 0 | 32 | 68 |
| 18 | 0 | 32 | 68 |
| 19 | 0 | 33 | 67 |
| 20 | 0 | 34 | 66 |
| 21 | 0 | 35 | 65 |
| 22 | 0 | 37 | 63 |
| 23 | 0 | 38 | 62 |
| 24 | 0 | 40 | 60 |
| 25 | 0 | 42 | 58 |
| 26 | 0 | 44 | 56 |
| 27 | 0 | 47 | 53 |
| 28 | 0 | 49 | 51 |
| 29 | 0 | 51 | 49 |
| 30 | 0 | 54 | 46 |
| 31 | 0 | 56 | 44 |
Wind in May
Winds average 8 km/h in May.
Across May, daily wind ranges from about 7 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 9 | 9 | 9 | 9 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 8 | 8 | 8 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 9 | calm |
| 2 | 9 | calm |
| 3 | 9 | calm |
| 4 | 9 | calm |
| 5 | 8 | calm |
| 6 | 8 | calm |
| 7 | 8 | calm |
| 8 | 8 | calm |
| 9 | 8 | calm |
| 10 | 8 | calm |
| 11 | 8 | calm |
| 12 | 8 | calm |
| 13 | 8 | calm |
| 14 | 8 | calm |
| 15 | 8 | calm |
| 16 | 8 | calm |
| 17 | 8 | calm |
| 18 | 8 | calm |
| 19 | 7 | calm |
| 20 | 7 | calm |
| 21 | 7 | calm |
| 22 | 7 | calm |
| 23 | 7 | calm |
| 24 | 7 | calm |
| 25 | 7 | calm |
| 26 | 7 | calm |
| 27 | 7 | calm |
| 28 | 7 | calm |
| 29 | 8 | calm |
| 30 | 8 | calm |
| 31 | 8 | calm |
Sunrise & sunset in May
Daylight runs from about 12 h 18 min at the start of May to 12 h 24 min by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 6 minutes over May. Sunrise moves from 6:41 AM to 6:36 AM, and sunset from 6:58 PM to 7:03 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 12.3 | 12.3 | 12.3 | 12.3 | 12.3 | 12.3 | 12.3 | 12.3 | 12.3 | 12.3 | 12.4 | 12.4 | 12.4 | 12.4 | 12.4 | 12.4 | 12.4 | 12.4 | 12.4 | 12.4 | 12.4 | 12.4 | 12.4 | 12.4 | 12.4 | 12.4 | 12.4 | 12.4 | 12.4 | 12.4 | 12.4 |
| Sunrise (AM) | 6:41 | 6:40 | 6:40 | 6:40 | 6:40 | 6:39 | 6:39 | 6:39 | 6:38 | 6:38 | 6:38 | 6:38 | 6:38 | 6:37 | 6:37 | 6:37 | 6:37 | 6:37 | 6:37 | 6:37 | 6:37 | 6:36 | 6:36 | 6:36 | 6:36 | 6:36 | 6:36 | 6:36 | 6:36 | 6:36 | 6:36 |
| Sunset (PM) | 6:58 | 6:58 | 6:58 | 6:58 | 6:58 | 6:59 | 6:59 | 6:59 | 6:59 | 6:59 | 6:59 | 6:59 | 6:59 | 7:00 | 7:00 | 7:00 | 7:00 | 7:00 | 7:00 | 7:01 | 7:01 | 7:01 | 7:01 | 7:01 | 7:02 | 7:02 | 7:02 | 7:02 | 7:03 | 7:03 | 7:03 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 12.3 | 6:41 | 6:58 |
| 2 | 12.3 | 6:40 | 6:58 |
| 3 | 12.3 | 6:40 | 6:58 |
| 4 | 12.3 | 6:40 | 6:58 |
| 5 | 12.3 | 6:40 | 6:58 |
| 6 | 12.3 | 6:39 | 6:59 |
| 7 | 12.3 | 6:39 | 6:59 |
| 8 | 12.3 | 6:39 | 6:59 |
| 9 | 12.3 | 6:38 | 6:59 |
| 10 | 12.3 | 6:38 | 6:59 |
| 11 | 12.4 | 6:38 | 6:59 |
| 12 | 12.4 | 6:38 | 6:59 |
| 13 | 12.4 | 6:38 | 6:59 |
| 14 | 12.4 | 6:37 | 7:00 |
| 15 | 12.4 | 6:37 | 7:00 |
| 16 | 12.4 | 6:37 | 7:00 |
| 17 | 12.4 | 6:37 | 7:00 |
| 18 | 12.4 | 6:37 | 7:00 |
| 19 | 12.4 | 6:37 | 7:00 |
| 20 | 12.4 | 6:37 | 7:01 |
| 21 | 12.4 | 6:37 | 7:01 |
| 22 | 12.4 | 6:36 | 7:01 |
| 23 | 12.4 | 6:36 | 7:01 |
| 24 | 12.4 | 6:36 | 7:01 |
| 25 | 12.4 | 6:36 | 7:02 |
| 26 | 12.4 | 6:36 | 7:02 |
| 27 | 12.4 | 6:36 | 7:02 |
| 28 | 12.4 | 6:36 | 7:02 |
| 29 | 12.4 | 6:36 | 7:03 |
| 30 | 12.4 | 6:36 | 7:03 |
| 31 | 12.4 | 6:36 | 7:03 |
Solar energy in May
Average shortwave solar energy reaching the ground each day in May, about 4.78 kWh/m².
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 — May's 4.78 kWh/m² falls in the middle.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 5.2 | 5.2 | 5.2 | 5.1 | 5.1 | 5.1 | 5.0 | 5.0 | 5.0 | 5.0 | 4.9 | 4.9 | 4.9 | 4.8 | 4.8 | 4.8 | 4.8 | 4.7 | 4.7 | 4.7 | 4.7 | 4.6 | 4.6 | 4.6 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.4 | 4.4 |
| Level | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 5.2 | Bright |
| 2 | 5.2 | Bright |
| 3 | 5.2 | Bright |
| 4 | 5.1 | Bright |
| 5 | 5.1 | Bright |
| 6 | 5.1 | Bright |
| 7 | 5.0 | Bright |
| 8 | 5.0 | Bright |
| 9 | 5.0 | Bright |
| 10 | 5.0 | Bright |
| 11 | 4.9 | Bright |
| 12 | 4.9 | Bright |
| 13 | 4.9 | Bright |
| 14 | 4.8 | Bright |
| 15 | 4.8 | Bright |
| 16 | 4.8 | Bright |
| 17 | 4.8 | Bright |
| 18 | 4.7 | Bright |
| 19 | 4.7 | Bright |
| 20 | 4.7 | Bright |
| 21 | 4.7 | Bright |
| 22 | 4.6 | Bright |
| 23 | 4.6 | Bright |
| 24 | 4.6 | Bright |
| 25 | 4.5 | Bright |
| 26 | 4.5 | Bright |
| 27 | 4.5 | Bright |
| 28 | 4.5 | Bright |
| 29 | 4.5 | Bright |
| 30 | 4.4 | Bright |
| 31 | 4.4 | Bright |
Hazard calendar for Waterloo
None of Waterloo's seasonal hazards are active in May. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.
Waterloo's monsoon runs June–September, when most of the year's rain falls.
Waterloo sees seasonal dust haze (February–April), heaviest in February.
Is May a good time to visit Waterloo?
Our two travel scores rate May for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
May is a weaker month for outdoor sightseeing in Waterloo.
What to pack for Waterloo in May
From May's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In May, Waterloo sees daytime highs around 29°C and nights near 25°C. Pack light clothes and rain gear. Worth having: sun protection. About 25 days see rain.
Sea temperature near Waterloo in May
The nearest coast averages about 29°C in May — 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 28 | 28 | 28 | 28 | 29 | 28 | 27 | 27 | 27 | 28 | 29 | 29 |
| Comfort | Warm | Warm | Warm | Warm | Tropical | Tropical | Warm | Warm | Warm | Warm | Tropical | Tropical |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 28 | Warm |
| Feb | 28 | Warm |
| Mar | 28 | Warm |
| Apr | 28 | Warm |
| May | 29 | Tropical |
| Jun | 28 | Tropical |
| Jul | 27 | Warm |
| Aug | 27 | Warm |
| Sep | 27 | Warm |
| Oct | 28 | Warm |
| Nov | 29 | Tropical |
| Dec | 29 | Tropical |
UV index in Waterloo in May
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 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 9 | 12 | 12 | 11 | 12 | 12 | 11 | 13 | 12 | 11 | 9 | 8 |
| Level | Very high | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | Very high |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 9 | Very high |
| Feb | 12 | Extreme |
| Mar | 12 | Extreme |
| Apr | 11 | Extreme |
| May | 12 | Extreme |
| Jun | 12 | Extreme |
| Jul | 11 | Extreme |
| Aug | 13 | Extreme |
| Sep | 12 | Extreme |
| Oct | 11 | Extreme |
| Nov | 9 | Very high |
| Dec | 8 | Very high |
Air quality in Waterloo in May
Average fine-particle pollution (PM2.5) through the year — so you can see where May 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).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 72 | 78 | 106 | 217 | 43 | 20 | 14 | 11 | 12 | 18 | 27 | 54 |
| Level | Unhealthy | Unhealthy | Unhealthy | Very unhealthy | Poor | Moderate | Moderate | Good | Moderate | Moderate | Moderate | Poor |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 72 | Unhealthy |
| Feb | 78 | Unhealthy |
| Mar | 106 | Unhealthy |
| Apr | 217 | Very unhealthy |
| May | 43 | Poor |
| Jun | 20 | Moderate |
| Jul | 14 | Moderate |
| Aug | 11 | Good |
| Sep | 12 | Moderate |
| Oct | 18 | Moderate |
| Nov | 27 | Moderate |
| Dec | 54 | Poor |
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.
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.
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
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).