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Port Blair, India climate
Am Tropical monsoon
Port Blair has a remarkably steady tropical climate (Tropical monsoon, Köppen Am). The hottest month is April with an average daily high near 33°C, while the coldest is January averaging around 23°C at night. Precipitation totals about 2792 mm a year and is strongly seasonal — September alone averages 469 mm while February barely receives 7 mm.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Port Blair climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 30 | 31 | 32 | 33 | 31 | 30 | 30 | 30 | 29 | 30 | 31 | 30 |
| Avg temp (°C) | 26 | 27 | 27 | 29 | 28 | 27 | 27 | 27 | 27 | 27 | 27 | 27 |
| Avg low (°C) | 23 | 23 | 23 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 |
| Precipitation (mm) | 42 | 7 | 36 | 87 | 428 | 460 | 367 | 380 | 469 | 286 | 166 | 64 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 30 | 31 | 32 | 33 | 31 | 30 |
| Avg temp (°C) | 26 | 27 | 27 | 29 | 28 | 27 |
| Avg low (°C) | 23 | 23 | 23 | 24 | 24 | 24 |
| Precipitation (mm) | 42 | 7 | 36 | 87 | 428 | 460 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 30 | 30 | 29 | 30 | 31 | 30 |
| Avg temp (°C) | 27 | 27 | 27 | 27 | 27 | 27 |
| Avg low (°C) | 24 | 24 | 24 | 24 | 24 | 24 |
| Precipitation (mm) | 367 | 380 | 469 | 286 | 166 | 64 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 3 | 1 | 2 | 4 | 15 | 18 | 19 | 19 | 19 | 16 | 10 | 7 |
| Days with high ≥ 32°C (days) | 0.2 | 2 | 9 | 16 | 8 | 1.0 | 0.1 | 0.2 | 0.2 | 2 | 3 | 0.4 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 3 | 1 | 2 | 4 | 15 | 18 |
| Days with high ≥ 32°C (days) | 0.2 | 2 | 9 | 16 | 8 | 1.0 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 19 | 19 | 19 | 16 | 10 | 7 |
| Days with high ≥ 32°C (days) | 0.1 | 0.2 | 0.2 | 2 | 3 | 0.4 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 49 | 38 | 40 | 52 | 82 | 90 | 91 | 90 | 87 | 76 | 67 | 58 |
| Relative humidity (%) | 75 | 72 | 70 | 72 | 79 | 83 | 84 | 84 | 84 | 82 | 79 | 76 |
| Wind speed (mph) | 10.4 | 8.6 | 6.5 | 5.7 | 10.4 | 14.5 | 14.7 | 14.6 | 12.0 | 8.7 | 9.8 | 10.9 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 49 | 38 | 40 | 52 | 82 | 90 |
| Relative humidity (%) | 75 | 72 | 70 | 72 | 79 | 83 |
| Wind speed (mph) | 10.4 | 8.6 | 6.5 | 5.7 | 10.4 | 14.5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 91 | 90 | 87 | 76 | 67 | 58 |
| Relative humidity (%) | 84 | 84 | 84 | 82 | 79 | 76 |
| Wind speed (mph) | 14.7 | 14.6 | 12.0 | 8.7 | 9.8 | 10.9 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 19 years of daily observations at Port Blair, a weather station, about 3 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.