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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 91°F, while the coldest is January averaging around 73°F at night. Precipitation totals about 110 inches a year and is strongly seasonal — September alone averages 18.5 inches while February barely receives 0.26 inches.
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 (°F) | 86 | 88 | 89 | 91 | 88 | 86 | 85 | 85 | 85 | 87 | 87 | 86 |
| Avg temp (°F) | 80 | 80 | 81 | 83 | 82 | 81 | 80 | 80 | 80 | 81 | 81 | 81 |
| Avg low (°F) | 73 | 73 | 74 | 76 | 76 | 76 | 75 | 75 | 74 | 75 | 76 | 75 |
| Precipitation (in) | 1.7 | 0.3 | 1.4 | 3.4 | 16.8 | 18.1 | 14.4 | 15.0 | 18.5 | 11.3 | 6.5 | 2.5 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 86 | 88 | 89 | 91 | 88 | 86 |
| Avg temp (°F) | 80 | 80 | 81 | 83 | 82 | 81 |
| Avg low (°F) | 73 | 73 | 74 | 76 | 76 | 76 |
| Precipitation (in) | 1.7 | 0.3 | 1.4 | 3.4 | 16.8 | 18.1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 85 | 85 | 85 | 87 | 87 | 86 |
| Avg temp (°F) | 80 | 80 | 80 | 81 | 81 | 81 |
| Avg low (°F) | 75 | 75 | 74 | 75 | 76 | 75 |
| Precipitation (in) | 14.4 | 15.0 | 18.5 | 11.3 | 6.5 | 2.5 |
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 ≥ 90°F (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 ≥ 90°F (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 ≥ 90°F (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.