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Monthly climate in Portland, Indiana, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Portland features a humid continental climate (Dfa).Temperatures typically range between -2 °C (29 °F) and 24 °C (76 °F) through the year, but rarely can drop to -25 °C (-12 °F) or can rise to as high as 35 °C (95 °F).The average annual precipitation amounts to about 1120 mm (44.1 inches) and receives 132 rainy days on the 1 mm (0.04 inches) threshold annually.Portland enjoys an average of 2862 hours of sunshine throughout the year, and daylight varies from 9 hours 18 minutes to 15 hours 0 minutes per day.

Monthly average temperatures in Portland, Indiana, United States §

The warmest months in Portland are June, July and August, with daily mean temperatures ranging from 22 to 24 °C (73 - 76 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -2 to 2 °C (29 - 35 °F) throughout the day. On average each year, Portland experiences 95 days above 25 °C (77.0 °F) and 93 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Portland, Indiana, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 18°C
(64°F)		 22°C
(73°F)		 24°C
(76°F)		 29°C
(84°F)		 34°C
(93°F)		 34°C
(93°F)		 35°C
(95°F)		 34°C
(94°F)		 33°C
(91°F)		 33°C
(91°F)		 26°C
(80°F)		 17°C
(63°F)
Mean maximum 15°C
(59°F)		 17°C
(63°F)		 21°C
(69°F)		 27°C
(81°F)		 31°C
(88°F)		 33°C
(91°F)		 33°C
(92°F)		 32°C
(90°F)		 32°C
(90°F)		 29°C
(85°F)		 20°C
(68°F)		 16°C
(61°F)
Average high 2°C
(36°F)		 4°C
(40°F)		 10°C
(51°F)		 16°C
(61°F)		 22°C
(72°F)		 27°C
(81°F)		 29°C
(84°F)		 28°C
(82°F)		 26°C
(79°F)		 19°C
(66°F)		 10°C
(49°F)		 6°C
(43°F)
Daily mean -2°C
(29°F)		 -0°C
(32°F)		 5°C
(42°F)		 10°C
(51°F)		 17°C
(63°F)		 22°C
(73°F)		 24°C
(76°F)		 23°C
(74°F)		 20°C
(69°F)		 14°C
(57°F)		 5°C
(42°F)		 2°C
(35°F)
Average low -5°C
(23°F)		 -4°C
(25°F)		 0°C
(33°F)		 5°C
(42°F)		 12°C
(55°F)		 18°C
(64°F)		 20°C
(68°F)		 18°C
(65°F)		 15°C
(60°F)		 9°C
(49°F)		 1°C
(34°F)		 -2°C
(28°F)
Mean minimum -19°C
(-1°F)		 -17°C
(2°F)		 -9°C
(16°F)		 -5°C
(24°F)		 2°C
(37°F)		 12°C
(53°F)		 14°C
(57°F)		 12°C
(54°F)		 8°C
(46°F)		 0°C
(32°F)		 -8°C
(18°F)		 -13°C
(9°F)
Minimum -25°C
(-12°F)		 -21°C
(-6°F)		 -13°C
(8°F)		 -7°C
(20°F)		 -1°C
(30°F)		 9°C
(48°F)		 11°C
(52°F)		 10°C
(51°F)		 4°C
(39°F)		 -2°C
(29°F)		 -15°C
(5°F)		 -22°C
(-7°F)

Compare climate in Portland with other places

Compare temperature, precipitation, sunshine, UV index in Portland, Indiana, United States with other places around the world.

Monthly average precipitation in Portland, Indiana, United States §

Portland usually has the most precipitation in May, June and August, with an average of 12 rainy days and 114 mm (4.5 inches) of precipitation per month.The driest months in Portland are January, September and December. On average, 72 mm (2.8 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Portland, Indiana, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 74 (2.9) 88 (3.4) 101 (4.0) 93 (3.7) 127 (5.0) 114 (4.5) 101 (4.0) 102 (4.0) 75 (2.9) 97 (3.8) 82 (3.2) 67 (2.7)
Average precipitation days (≥ 1 mm) 8 12 12 12 14 13 12 11 8 12 9 9

Monthly sunshine hours in Portland, Indiana, United States §

The sunniest months in Portland are June, July and August, when the sun shines an average of 10 hours 50 minutes a day.Least sunny months in Portland: January, February and December receive an average of 4 hours 49 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Portland, Indiana, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 112 161 221 232 274 322 349 325 282 230 184 165
Mean daily daylight hours 9h 37m 10h 39m 11h 58m 13h 19m 14h 27m 15h 0m 14h 42m 13h 41m 12h 24m 11h 4m 9h 54m 9h 18m

Solar UV radiation in Portland, Indiana, United States §

Portland experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 10 - 11, which corresponds to the Very High / Extreme category of sun exposure.January, November and December are in the Low / Moderate exposure category. In these months, the maximum values of the UV index do not exceed 4. For more detailed information, check out our hourly Portland UV Index data.

Average daily maximum UV levels by month for Portland, Indiana, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 3 5 6 9 10 11 10 9 8 6 4 2