Chilaw weather in March
In March, Chilaw sees average daytime highs of 31°C and overnight lows near 26°C, with 69 mm of rain across 13.7 wet days and about 11.9 hours of daylight. It is the 1st-warmest and 10th-wettest month of the year here.
Day-to-day highs hold fairly steady near 31°C through the month. The sky is clear or mostly clear about 45% of the time in March, and the air most often feels miserable.
Daylight stretches from about 11 h 48 min at the start of March to 12 h 06 min by month's end. Set against the rest of the year, March is Chilaw's 2nd-clearest and 12th-windiest month. For the whole year in context, see Chilaw's year-round climate.
- Daytime high
- 31°
- 1st warmest
- Overnight low
- 26°
- 7th coldest
- Rainfall
- 69 mm
- 13.7 wet days
- Daylight
- 11 h 54 min
- 6:22 AM – 6:19 PM
- Cloud cover
- 49%
- 2nd clearest
- Wind
- 11 km/h
- 12th windiest
- Solar energy
- 6.51 kWh/m²
- Travel score
- 4.4
- out of 10
Chilaw is large town in Puttalam district, Sri Lanka.
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in March
Day-to-day highs hold fairly steady near 31°C through the month.
A typical March day in Chilaw reaches about 31°C in the afternoon and slips back to 26°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 29°C and 32°C. Set against its neighbours, March runs on par with February and on par with April.
| 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) | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 30 | 30 | 30 | 30 | 30 | 30 |
| Avg low (°C) | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 31 | 25 |
| 2 | 31 | 25 |
| 3 | 31 | 25 |
| 4 | 31 | 25 |
| 5 | 31 | 25 |
| 6 | 31 | 25 |
| 7 | 31 | 25 |
| 8 | 31 | 25 |
| 9 | 31 | 26 |
| 10 | 31 | 26 |
| 11 | 31 | 26 |
| 12 | 31 | 26 |
| 13 | 31 | 26 |
| 14 | 31 | 26 |
| 15 | 31 | 26 |
| 16 | 31 | 26 |
| 17 | 31 | 26 |
| 18 | 31 | 26 |
| 19 | 31 | 26 |
| 20 | 31 | 26 |
| 21 | 31 | 26 |
| 22 | 31 | 26 |
| 23 | 31 | 26 |
| 24 | 31 | 26 |
| 25 | 31 | 26 |
| 26 | 30 | 26 |
| 27 | 30 | 26 |
| 28 | 30 | 26 |
| 29 | 30 | 26 |
| 30 | 30 | 26 |
| 31 | 30 | 26 |
How March really feels in Chilaw
Once humidity and wind are folded in, March 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 March is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Chilaw weather by month
How March compares with the rest of the year at a glance. March is the 1st-warmest and 10th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 30° / 24° | 37 | 6.1 | 11.6 | 5.7 |
| Feb | 31° / 25° | 33 | 6 | 11.8 | 5.2 |
| Mar | 31° / 26° | 69 | 13.7 | 11.9 | 4.4 |
| Apr | 30° / 26° | 152 | 24.9 | 12.2 | 3.2 |
| May | 30° / 27° | 221 | 28.1 | 12.3 | 3.0 |
| Jun | 29° / 27° | 185 | 25.8 | 12.4 | 3.4 |
| Jul | 28° / 26° | 133 | 22.1 | 12.4 | 4.0 |
| Aug | 28° / 26° | 129 | 21.9 | 12.2 | 4.1 |
| Sep | 28° / 26° | 180 | 24.4 | 12 | 3.7 |
| Oct | 29° / 26° | 298 | 26.1 | 11.8 | 3.5 |
| Nov | 29° / 25° | 261 | 22.2 | 11.7 | 3.8 |
| Dec | 29° / 25° | 131 | 13.5 | 11.6 | 5.0 |
Cloud cover in March
The sky is clear or mostly clear about 45% of the time in March.
Beyond those clear spells, partly cloudy skies cover about 20% of March, with mostly cloudy or overcast conditions the remaining 35%. 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 (%) | 65 | 65 | 66 | 66 | 66 | 67 | 67 | 66 | 67 | 67 | 67 | 67 | 67 | 67 | 67 | 67 | 67 | 66 | 65 | 65 | 65 | 65 | 64 | 63 | 63 | 62 | 61 | 60 | 59 | 58 | 56 |
| Cloudier (%) | 35 | 35 | 34 | 34 | 34 | 33 | 33 | 34 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 34 | 35 | 35 | 35 | 35 | 36 | 37 | 37 | 38 | 39 | 40 | 41 | 42 | 44 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 65 | 35 |
| 2 | 65 | 35 |
| 3 | 66 | 34 |
| 4 | 66 | 34 |
| 5 | 66 | 34 |
| 6 | 67 | 33 |
| 7 | 67 | 33 |
| 8 | 66 | 34 |
| 9 | 67 | 33 |
| 10 | 67 | 33 |
| 11 | 67 | 33 |
| 12 | 67 | 33 |
| 13 | 67 | 33 |
| 14 | 67 | 33 |
| 15 | 67 | 33 |
| 16 | 67 | 33 |
| 17 | 67 | 33 |
| 18 | 66 | 34 |
| 19 | 65 | 35 |
| 20 | 65 | 35 |
| 21 | 65 | 35 |
| 22 | 65 | 35 |
| 23 | 64 | 36 |
| 24 | 63 | 37 |
| 25 | 63 | 37 |
| 26 | 62 | 38 |
| 27 | 61 | 39 |
| 28 | 60 | 40 |
| 29 | 59 | 41 |
| 30 | 58 | 42 |
| 31 | 56 | 44 |
Chance of precipitation in March
Chilaw gets around 69 mm of rain over 13.7 wet days in March. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 45% and peaks near 68% 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 (%) | 26 | 27 | 28 | 29 | 31 | 33 | 34 | 36 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 48 | 49 | 50 | 51 | 52 | 53 | 55 | 57 | 59 | 61 | 64 | 66 | 68 |
| Rain chance (%) | |
|---|---|
| 1 | 26 |
| 2 | 27 |
| 3 | 28 |
| 4 | 29 |
| 5 | 31 |
| 6 | 33 |
| 7 | 34 |
| 8 | 36 |
| 9 | 38 |
| 10 | 39 |
| 11 | 40 |
| 12 | 41 |
| 13 | 42 |
| 14 | 43 |
| 15 | 44 |
| 16 | 45 |
| 17 | 46 |
| 18 | 47 |
| 19 | 48 |
| 20 | 49 |
| 21 | 50 |
| 22 | 51 |
| 23 | 52 |
| 24 | 53 |
| 25 | 55 |
| 26 | 57 |
| 27 | 59 |
| 28 | 61 |
| 29 | 64 |
| 30 | 66 |
| 31 | 68 |
Humidity in March
Most of March feels miserable — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, March lands in the miserable band about 47% 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Humid (%) | 2 | 2 | 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 |
| Muggy (%) | 16 | 15 | 14 | 13 | 12 | 12 | 11 | 10 | 9 | 9 | 8 | 7 | 7 | 6 | 6 | 5 | 4 | 4 | 3 | 3 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 |
| Oppressive (%) | 68 | 67 | 67 | 67 | 66 | 64 | 64 | 63 | 63 | 61 | 59 | 58 | 56 | 54 | 52 | 50 | 48 | 46 | 44 | 41 | 39 | 36 | 33 | 31 | 28 | 26 | 23 | 21 | 19 | 17 | 16 |
| Miserable (%) | 14 | 16 | 18 | 19 | 21 | 23 | 24 | 26 | 28 | 30 | 33 | 35 | 37 | 40 | 42 | 45 | 47 | 50 | 53 | 56 | 59 | 62 | 66 | 68 | 71 | 73 | 76 | 79 | 81 | 83 | 84 |
| Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|
| 1 | 2 | 16 | 68 | 14 |
| 2 | 2 | 15 | 67 | 16 |
| 3 | 1 | 14 | 67 | 18 |
| 4 | 1 | 13 | 67 | 19 |
| 5 | 1 | 12 | 66 | 21 |
| 6 | 1 | 12 | 64 | 23 |
| 7 | 1 | 11 | 64 | 24 |
| 8 | 1 | 10 | 63 | 26 |
| 9 | 0 | 9 | 63 | 28 |
| 10 | 0 | 9 | 61 | 30 |
| 11 | 0 | 8 | 59 | 33 |
| 12 | 0 | 7 | 58 | 35 |
| 13 | 0 | 7 | 56 | 37 |
| 14 | 0 | 6 | 54 | 40 |
| 15 | 0 | 6 | 52 | 42 |
| 16 | 0 | 5 | 50 | 45 |
| 17 | 0 | 4 | 48 | 47 |
| 18 | 0 | 4 | 46 | 50 |
| 19 | 0 | 3 | 44 | 53 |
| 20 | 0 | 3 | 41 | 56 |
| 21 | 0 | 2 | 39 | 59 |
| 22 | 0 | 2 | 36 | 62 |
| 23 | 0 | 1 | 33 | 66 |
| 24 | 0 | 1 | 31 | 68 |
| 25 | 0 | 1 | 28 | 71 |
| 26 | 0 | 1 | 26 | 73 |
| 27 | 0 | 1 | 23 | 76 |
| 28 | 0 | 0 | 21 | 79 |
| 29 | 0 | 0 | 19 | 81 |
| 30 | 0 | 0 | 17 | 83 |
| 31 | 0 | 0 | 16 | 84 |
Wind in March
Winds average 11 km/h in March, the calmest month.
Across March, daily wind ranges from about 10 km/h on the calmest days to 12 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) | 12 | 12 | 12 | 12 | 12 | 12 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 |
| Feels | light breeze | light breeze | light breeze | 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 | 12 | light breeze |
| 2 | 12 | light breeze |
| 3 | 12 | light breeze |
| 4 | 12 | calm |
| 5 | 12 | calm |
| 6 | 12 | calm |
| 7 | 11 | calm |
| 8 | 11 | calm |
| 9 | 11 | calm |
| 10 | 11 | calm |
| 11 | 11 | calm |
| 12 | 11 | calm |
| 13 | 11 | calm |
| 14 | 11 | calm |
| 15 | 10 | calm |
| 16 | 10 | calm |
| 17 | 10 | calm |
| 18 | 10 | calm |
| 19 | 10 | calm |
| 20 | 10 | calm |
| 21 | 10 | calm |
| 22 | 10 | calm |
| 23 | 10 | calm |
| 24 | 10 | calm |
| 25 | 10 | calm |
| 26 | 10 | calm |
| 27 | 10 | calm |
| 28 | 10 | calm |
| 29 | 10 | calm |
| 30 | 10 | calm |
| 31 | 10 | calm |
Sunrise & sunset in March
Daylight runs from about 11 h 48 min at the start of March to 12 h 06 min by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 18 minutes over March. Sunrise moves from 6:29 AM to 6:14 AM, and sunset from 6:19 PM to 6:17 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) | 11.8 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.1 |
| Sunrise (AM) | 6:29 | 6:28 | 6:28 | 6:28 | 6:27 | 6:27 | 6:26 | 6:26 | 6:25 | 6:25 | 6:24 | 6:24 | 6:24 | 6:23 | 6:23 | 6:22 | 6:22 | 6:21 | 6:20 | 6:20 | 6:19 | 6:19 | 6:18 | 6:18 | 6:17 | 6:17 | 6:16 | 6:16 | 6:15 | 6:15 | 6:14 |
| Sunset (PM) | 6:19 | 6:19 | 6:19 | 6:19 | 6:19 | 6:19 | 6:19 | 6:19 | 6:19 | 6:19 | 6:19 | 6:19 | 6:19 | 6:19 | 6:19 | 6:19 | 6:19 | 6:19 | 6:19 | 6:19 | 6:18 | 6:18 | 6:18 | 6:18 | 6:18 | 6:18 | 6:18 | 6:18 | 6:18 | 6:18 | 6:17 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 11.8 | 6:29 | 6:19 |
| 2 | 11.9 | 6:28 | 6:19 |
| 3 | 11.9 | 6:28 | 6:19 |
| 4 | 11.9 | 6:28 | 6:19 |
| 5 | 11.9 | 6:27 | 6:19 |
| 6 | 11.9 | 6:27 | 6:19 |
| 7 | 11.9 | 6:26 | 6:19 |
| 8 | 11.9 | 6:26 | 6:19 |
| 9 | 11.9 | 6:25 | 6:19 |
| 10 | 11.9 | 6:25 | 6:19 |
| 11 | 11.9 | 6:24 | 6:19 |
| 12 | 11.9 | 6:24 | 6:19 |
| 13 | 11.9 | 6:24 | 6:19 |
| 14 | 11.9 | 6:23 | 6:19 |
| 15 | 11.9 | 6:23 | 6:19 |
| 16 | 11.9 | 6:22 | 6:19 |
| 17 | 12.0 | 6:22 | 6:19 |
| 18 | 12.0 | 6:21 | 6:19 |
| 19 | 12.0 | 6:20 | 6:19 |
| 20 | 12.0 | 6:20 | 6:19 |
| 21 | 12.0 | 6:19 | 6:18 |
| 22 | 12.0 | 6:19 | 6:18 |
| 23 | 12.0 | 6:18 | 6:18 |
| 24 | 12.0 | 6:18 | 6:18 |
| 25 | 12.0 | 6:17 | 6:18 |
| 26 | 12.0 | 6:17 | 6:18 |
| 27 | 12.0 | 6:16 | 6:18 |
| 28 | 12.0 | 6:16 | 6:18 |
| 29 | 12.0 | 6:15 | 6:18 |
| 30 | 12.0 | 6:15 | 6:18 |
| 31 | 12.1 | 6:14 | 6:17 |
Solar energy in March
Average shortwave solar energy reaching the ground each day in March, about 6.51 kWh/m² — the sunniest month for solar.
For context, solar energy here swings from a low near 4.7 kWh/m² to a high of 6.51 kWh/m² in March across the year — March's 6.51 kWh/m² sits near the top of that range.
| 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) | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 | 6.4 | 6.4 | 6.4 | 6.4 | 6.3 | 6.3 |
| Level | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 6.5 | Intense |
| 2 | 6.5 | Intense |
| 3 | 6.5 | Intense |
| 4 | 6.5 | Intense |
| 5 | 6.5 | Intense |
| 6 | 6.5 | Intense |
| 7 | 6.5 | Intense |
| 8 | 6.5 | Intense |
| 9 | 6.5 | Intense |
| 10 | 6.5 | Intense |
| 11 | 6.5 | Intense |
| 12 | 6.5 | Intense |
| 13 | 6.5 | Intense |
| 14 | 6.5 | Intense |
| 15 | 6.5 | Intense |
| 16 | 6.5 | Intense |
| 17 | 6.5 | Intense |
| 18 | 6.5 | Intense |
| 19 | 6.5 | Intense |
| 20 | 6.5 | Intense |
| 21 | 6.5 | Intense |
| 22 | 6.5 | Intense |
| 23 | 6.5 | Intense |
| 24 | 6.5 | Intense |
| 25 | 6.5 | Intense |
| 26 | 6.4 | Intense |
| 27 | 6.4 | Intense |
| 28 | 6.4 | Intense |
| 29 | 6.4 | Intense |
| 30 | 6.3 | Intense |
| 31 | 6.3 | Intense |
Hazard calendar for Chilaw
None of Chilaw's seasonal hazards are active in March. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.
Chilaw sits in the North Indian Ocean cyclone zone; the season peaks May and October–November.
Is March a good time to visit Chilaw?
Our two travel scores rate March for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
March is a reasonable time to visit Chilaw for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Chilaw in March
From March's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In March, Chilaw sees daytime highs around 31°C and nights near 26°C. Pack light clothes, rain gear and sun protection. About 14 days see rain.
Sea temperature near Chilaw in March
The nearest coast averages about 29°C in March — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 20 km away) is warmest in April at about 30°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 | 29 | 30 | 29 | 28 | 27 | 27 | 28 | 28 | 29 | 28 |
| Comfort | Warm | Warm | Tropical | Tropical | Tropical | Tropical | Warm | Warm | Warm | Tropical | Tropical | Tropical |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 28 | Warm |
| Feb | 28 | Warm |
| Mar | 29 | Tropical |
| Apr | 30 | Tropical |
| May | 29 | Tropical |
| Jun | 28 | Tropical |
| Jul | 27 | Warm |
| Aug | 27 | Warm |
| Sep | 28 | Warm |
| Oct | 28 | Tropical |
| Nov | 29 | Tropical |
| Dec | 28 | Tropical |
UV index in Chilaw in March
Clear-sky midday UV in March 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 Chilaw peaks around April 18 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 9 (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) | 10 | 13 | 13 | 13 | 13 | 11 | 12 | 13 | 13 | 12 | 10 | 9 |
| Level | Very high | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 10 | Very high |
| Feb | 13 | Extreme |
| Mar | 13 | Extreme |
| Apr | 13 | Extreme |
| May | 13 | Extreme |
| Jun | 11 | Extreme |
| Jul | 12 | Extreme |
| Aug | 13 | Extreme |
| Sep | 13 | Extreme |
| Oct | 12 | Extreme |
| Nov | 10 | Extreme |
| Dec | 9 | Very high |
Air quality in Chilaw in March
Average fine-particle pollution (PM2.5) through the year — so you can see where March falls, not just the annual average.
Air quality in Chilaw is worst in March — around 30 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (August, 17 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) | 23 | 23 | 30 | 28 | 24 | 18 | 17 | 17 | 17 | 19 | 24 | 23 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 23 | Moderate |
| Feb | 23 | Moderate |
| Mar | 30 | Moderate |
| Apr | 28 | Moderate |
| May | 24 | Moderate |
| Jun | 18 | Moderate |
| Jul | 17 | Moderate |
| Aug | 17 | Moderate |
| Sep | 17 | Moderate |
| Oct | 19 | Moderate |
| Nov | 24 | Moderate |
| Dec | 23 | Moderate |
Where is Chilaw?
Chilaw sits at 7.6°N, 79.8°E, 8 m above sea level, in Sri Lanka. The nearest listed city is Negombo, 41 km away.
Topography around Chilaw
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Chilaw.
Within 3 km, the terrain around Chilaw has only modest variations in elevation — a maximum elevation change of 15 m around an average of 3 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 67 m; within 80 km, large variations in elevation — a maximum elevation change of 977 m.
The land around Chilaw is covered by water (38%) and trees (33%) within 3 km, water (52%) and trees (39%) within 16 km, and trees (53%) and water (37%) within 80 km.
Sri Lanka travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type D / G / M
- 230 V · 50 Hz
- Prices
- ≈ 27% of US
- price level, 2025
- GDP per capita
- $5,002
- 2025
- Happiness
- 4.0 / 10
- World Happiness, 2025
- Safe drinking water
- 47%
- of population, 2024
- Homicide rate
- 3.3
- per 100k, 2019
- Road deaths
- 19.7
- per 100k/yr, 2019
- Income group
- Upper middle
- World Bank
- English
- Low
- EF EPI 486
- 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 Chilaw (7.5758°, 79.7953°, elevation 8 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). 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).