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Monthly climate in Lethem, Guyana

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Lethem features a tropical monsoon climate (Am). Temperatures typically range between 26 °C (79 °F) and 30 °C (86 °F) through the year, but rarely can drop to 21 °C (70 °F) or can rise to as high as 38 °C (101 °F). The average annual precipitation amounts to about 1560 mm (61.4 inches) and receives 164 rainy days on the 1 mm (0.04 inches) threshold annually. Lethem enjoys an average of 3595 hours of sunshine throughout the year, and daylight varies from 11 hours 55 minutes to 12 hours 17 minutes per day.

Monthly average temperatures in Lethem, Guyana

The warmest months in Lethem are March, October and November, with daily mean temperatures ranging from 28 to 30 °C (83 - 86 °F) throughout the day. The coldest temperatures usually occur in May, June and July, when daily mean temperatures range from 26 to 26 °C (79 - 80 °F) throughout the day. On average each year, Lethem experiences 329 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 Lethem. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum37°C
(98°F)		36°C
(97°F)		37°C
(98°F)		37°C
(100°F)		37°C
(99°F)		34°C
(94°F)		33°C
(92°F)		35°C
(95°F)		37°C
(100°F)		38°C
(101°F)		38°C
(100°F)		37°C
(98°F)
Mean maximum35°C
(96°F)		35°C
(95°F)		36°C
(97°F)		36°C
(98°F)		34°C
(94°F)		32°C
(90°F)		32°C
(90°F)		35°C
(94°F)		36°C
(98°F)		37°C
(99°F)		37°C
(99°F)		35°C
(95°F)
Average high33°C
(92°F)		33°C
(91°F)		33°C
(92°F)		33°C
(92°F)		30°C
(87°F)		30°C
(86°F)		30°C
(86°F)		31°C
(89°F)		34°C
(93°F)		35°C
(96°F)		35°C
(95°F)		33°C
(91°F)
Daily mean28°C
(82°F)		28°C
(82°F)		28°C
(83°F)		28°C
(83°F)		26°C
(80°F)		26°C
(79°F)		26°C
(79°F)		27°C
(81°F)		28°C
(83°F)		30°C
(86°F)		29°C
(85°F)		28°C
(82°F)
Average low24°C
(75°F)		23°C
(75°F)		24°C
(75°F)		24°C
(76°F)		24°C
(75°F)		23°C
(74°F)		23°C
(73°F)		24°C
(75°F)		24°C
(76°F)		25°C
(77°F)		25°C
(77°F)		24°C
(75°F)
Mean minimum22°C
(72°F)		22°C
(72°F)		23°C
(73°F)		23°C
(73°F)		22°C
(72°F)		22°C
(72°F)		22°C
(71°F)		22°C
(72°F)		22°C
(73°F)		23°C
(74°F)		23°C
(74°F)		23°C
(73°F)
Minimum22°C
(72°F)		22°C
(72°F)		22°C
(72°F)		22°C
(72°F)		22°C
(72°F)		21°C
(70°F)		21°C
(70°F)		22°C
(71°F)		22°C
(72°F)		23°C
(74°F)		23°C
(73°F)		22°C
(71°F)

Compare climate in Lethem with other places

Compare temperature, precipitation, sunshine, UV index in Lethem, Guyana with other places around the world.

Monthly average precipitation in Lethem, Guyana

Lethem usually has the most precipitation in May, June and July, with an average of 27 rainy days and 317 mm (12.5 inches) of precipitation per month. The driest months in Lethem are January, February and December. On average, 30 mm (1.2 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Lethem. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)25 (1.0)28 (1.1)42 (1.7)99 (3.9)274 (10.8)353 (13.9)324 (12.7)165 (6.5)88 (3.5)43 (1.7)82 (3.2)36 (1.4)
Average precipitation days (≥ 1 mm)456102626292113888

Monthly sunshine hours in Lethem, Guyana

The sunniest months in Lethem are September, October and December, when the sun shines an average of 10 hours 37 minutes a day. Least sunny months in Lethem: January, May and June receive an average of 8 hours 46 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Lethem. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours265282312298273268292319320333305322
Mean daily daylight hours11h 56m11h 59m12h 5m12h 10m12h 15m12h 17m12h 16m12h 12m12h 6m12h 1m11h 57m11h 55m

Solar UV radiation in Lethem, Guyana

Lethem experiences the highest level of ultraviolet (UV) radiation in March, April and May, when the maximum UV index can reach values of 15 - 17, which corresponds to the Extreme category of sun exposure. June, July and October are in the Extreme exposure category. In these months, the maximum values of the UV index do not exceed 13. For more detailed information, check out our hourly Lethem UV Index data.

Average daily maximum UV levels by month for Lethem. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)131516171513121313131313