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Monthly averages for Siirt from the Turkish State Meteorological Service, measured over 1939–2025.
The warmest month is July, with an average high of 37.2 °C. The coldest is January, when the average low is -0.4 °C. March has the most rainy days (14.1 on average), and August the fewest (0.6).
Month by month
| Month | Avg high °C | Avg low °C | Rainy days | Sun (h/day) |
|---|---|---|---|---|
| January | 6.8 | -0.4 | 12.3 | 3.6 |
| February | 8.9 | 0.7 | 11.9 | 4.4 |
| March | 13.4 | 4.2 | 14.1 | 5.4 |
| April | 19.3 | 9.1 | 12.9 | 6.6 |
| May | 25.4 | 13.7 | 10.2 | 8.9 |
| June | 32.4 | 19.2 | 3.1 | 11.6 |
| July | 37.2 | 23.6 | 0.7 | 12 |
| August | 37.1 | 23.4 | 0.6 | 11.2 |
| September | 32.3 | 18.9 | 1.6 | 9.9 |
| October | 24.5 | 12.9 | 7 | 7.2 |
| November | 15.6 | 6.5 | 8.9 | 5.2 |
| December | 8.9 | 1.8 | 11.4 | 3.7 |
January
In January, Siirt averages a high of 6.8 °C and a low of -0.4 °C, with about 12.3 rainy days.
February
In February, Siirt averages a high of 8.9 °C and a low of 0.7 °C, with about 11.9 rainy days.
March
In March, Siirt averages a high of 13.4 °C and a low of 4.2 °C, with about 14.1 rainy days.
April
In April, Siirt averages a high of 19.3 °C and a low of 9.1 °C, with about 12.9 rainy days.
May
In May, Siirt averages a high of 25.4 °C and a low of 13.7 °C, with about 10.2 rainy days.
June
In June, Siirt averages a high of 32.4 °C and a low of 19.2 °C, with about 3.1 rainy days.
July
In July, Siirt averages a high of 37.2 °C and a low of 23.6 °C, with about 0.7 rainy days.
August
In August, Siirt averages a high of 37.1 °C and a low of 23.4 °C, with about 0.6 rainy days.
September
In September, Siirt averages a high of 32.3 °C and a low of 18.9 °C, with about 1.6 rainy days.
October
In October, Siirt averages a high of 24.5 °C and a low of 12.9 °C, with about 7 rainy days.
November
In November, Siirt averages a high of 15.6 °C and a low of 6.5 °C, with about 8.9 rainy days.
December
In December, Siirt averages a high of 8.9 °C and a low of 1.8 °C, with about 11.4 rainy days.
Sources
Meteoroloji Genel Müdürlüğü — Siirt (1939–2025) (opens in a new tab)