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Monthly climate in Casillas, Guatemala

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Casillas features a tropical savanna climate (Aw). Temperatures typically range between 18 °C (64 °F) and 21 °C (70 °F) through the year, but rarely can drop to 8 °C (46 °F) or can rise to as high as 33 °C (91 °F). The average annual precipitation amounts to about 1820 mm (71.7 inches) and receives 187 rainy days on the 1 mm (0.04 inches) threshold annually. Casillas enjoys an average of 3560 hours of sunshine throughout the year, and daylight varies from 11 hours 16 minutes to 12 hours 57 minutes per day.

Monthly average temperatures in Casillas, Guatemala

The warmest months in Casillas are April, May and June, with daily mean temperatures ranging from 20 to 21 °C (68 - 70 °F) throughout the day. The coldest temperatures usually occur in January, November and December, when daily mean temperatures range from 18 to 19 °C (64 - 66 °F) throughout the day. On average each year, Casillas experiences 237 days above 25 °C (77.0 °F) and 0 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Casillas. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum30°C
(86°F)		30°C
(87°F)		32°C
(91°F)		33°C
(91°F)		32°C
(90°F)		29°C
(84°F)		29°C
(84°F)		29°C
(84°F)		28°C
(83°F)		28°C
(82°F)		29°C
(84°F)		29°C
(84°F)
Mean maximum28°C
(83°F)		30°C
(86°F)		31°C
(88°F)		32°C
(89°F)		30°C
(86°F)		27°C
(81°F)		28°C
(83°F)		28°C
(82°F)		28°C
(83°F)		27°C
(81°F)		27°C
(82°F)		28°C
(82°F)
Average high25°C
(77°F)		27°C
(80°F)		28°C
(83°F)		28°C
(83°F)		27°C
(80°F)		25°C
(78°F)		26°C
(79°F)		26°C
(79°F)		26°C
(79°F)		25°C
(77°F)		25°C
(77°F)		25°C
(77°F)
Daily mean18°C
(64°F)		19°C
(66°F)		20°C
(68°F)		21°C
(70°F)		21°C
(69°F)		20°C
(68°F)		20°C
(68°F)		20°C
(68°F)		20°C
(68°F)		19°C
(67°F)		19°C
(66°F)		18°C
(65°F)
Average low12°C
(55°F)		13°C
(55°F)		14°C
(57°F)		15°C
(59°F)		16°C
(61°F)		16°C
(61°F)		15°C
(60°F)		15°C
(60°F)		16°C
(60°F)		16°C
(60°F)		14°C
(58°F)		13°C
(55°F)
Mean minimum9°C
(49°F)		10°C
(50°F)		10°C
(51°F)		12°C
(54°F)		15°C
(58°F)		15°C
(59°F)		14°C
(57°F)		14°C
(57°F)		14°C
(58°F)		14°C
(57°F)		11°C
(53°F)		9°C
(48°F)
Minimum8°C
(46°F)		8°C
(47°F)		9°C
(48°F)		10°C
(50°F)		14°C
(57°F)		14°C
(57°F)		13°C
(55°F)		13°C
(55°F)		14°C
(57°F)		13°C
(56°F)		10°C
(51°F)		8°C
(46°F)

Compare climate in Casillas with other places

Compare temperature, precipitation, sunshine, UV index in Casillas, Guatemala with other places around the world.

Monthly average precipitation in Casillas, Guatemala

Casillas usually has the most precipitation in June, September and October, with an average of 28 rainy days and 326 mm (12.8 inches) of precipitation per month. The driest months in Casillas are January, February and March. On average, 8 mm (0.3 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Casillas. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)8 (0.3)9 (0.4)7 (0.3)62 (2.5)257 (10.1)378 (14.9)170 (6.7)258 (10.2)314 (12.4)287 (11.3)52 (2.0)17 (0.7)
Average precipitation days (≥ 1 mm)21211262822252828113

Monthly sunshine hours in Casillas, Guatemala

The sunniest months in Casillas are March, July and December, when the sun shines an average of 10 hours 18 minutes a day. Least sunny months in Casillas: January, June and October receive an average of 8 hours 44 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Casillas. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours256286323312302272315306287275301319
Mean daily daylight hours11h 22m11h 39m12h 3m12h 27m12h 47m12h 57m12h 51m12h 34m12h 10m11h 47m11h 26m11h 16m

Solar UV radiation in Casillas, Guatemala

Casillas experiences the highest level of ultraviolet (UV) radiation in April, August and September, when the maximum UV index can reach values of 14 - 15, which corresponds to the Extreme category of sun exposure. January, November and December are in the Very High / Extreme exposure category. In these months, the maximum values of the UV index do not exceed 11. For more detailed information, check out our hourly Casillas UV Index data.

Average daily maximum UV levels by month for Casillas. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)111314151414141414131010