Mattala/Rajapaksa Intl climate by month
Averages and records for each calendar month at Mattala/Rajapaksa Intl, Sri Lanka, from 1869 to 2025. The warmest month is April, averaging 31.3°C; the coolest is December at 29.6°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 29.7°C | 22.5°C | 34.7°C7 January 1999 | 17.7°C27 January 1876 | 124 / 144 |
| February | 30.3°C | 22.6°C | 35.7°C23 February 2025 | 15.6°C16 February 1918 | 127 / 145 |
| March | 31.0°C | 23.5°C | 35.3°C24 March 1902 | 17.4°C10 March 1908 | 128 / 144 |
| April | 31.3°C | 24.5°C | 36.0°C21 April 1892 | 18.9°C17 April 1899 | 122 / 145 |
| May | 30.8°C | 25.2°C | 36.4°C7 May 1904 | 19.5°C28 May 1897 | 126 / 146 |
| June | 30.6°C | 24.8°C | 37.2°C3 June 1881 | 21.2°C7 June 1993 | 120 / 146 |
| July | 30.9°C | 24.5°C | 36.3°C22 July 2023 | 19.6°C1 July 1933 | 125 / 146 |
| August | 30.6°C | 24.4°C | 39.2°C22 August 1999 | 20.1°C10 August 1893 | 124 / 146 |
| September | 30.3°C | 24.3°C | 36.5°C27 September 2022 | 20.6°C8 September 1888 | 126 / 145 |
| October | 30.3°C | 24.0°C | 36.9°C31 October 1901 | 20.2°C31 October 1917 | 127 / 144 |
| November | 29.9°C | 23.4°C | 36.7°C12 November 1874 | 19.6°C1 November 1917 | 125 / 144 |
| December | 29.6°C | 22.9°C | 34.8°C7 December 2011 | 18.2°C30 December 1937 | 123 / 143 |
Years shows the number behind the average high, then the number holding a record for that month. They differ because a year contributes an average only when the month has at least 25 days of readings, while a single reading is enough to set a record. The average low is withheld on the same 25-day rule and is counted separately again; it is shown as a dash where the archive cannot support it. Across the twelve months here the averages rest on 120 to 128 years each.
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Every figure on this page is computed from NOAA GHCN-Daily observations stored per station, per year, per month. Nothing is modelled, interpolated or estimated, and a month the archive never covered is left out rather than filled in. A station appears here only once all twelve months carry an average from at least 10 years. See how this is built.