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Yellowstone National Park May Weather

Averages and records for weather in Yellowstone National Park, Wyoming in the month of May.

Typical Yellowstone National Park May Weather 1991–2020
Average daily high	54.9 °F
Average daily low	28.7 °F
Average monthly precipitation	2.6 inches
Average monthly snow	4.8 inches
Daily chance of precipitation	40.6%
Daily chance of snow	7.5%

Yellowstone National Park May Weather Records 1904–2024
Highest temperature	82 °F	May 30, 1936
Lowest temperature	3 °F	May 1, 2019
Highest daily low	49 °F	May 31, 2020
Lowest daily high	27 °F	May 5, 1909
Hottest average high temperature	64.6 °F	1936
Coldest average high temperature	43.2 °F	1909
Most daily precipitation	1.7 inches	May 26, 1980
Most monthly precipitation	5.2 inches	1996
Most daily snow	19.0 inches	May 26, 1980
Most monthly snow	31.0 inches	1986

Note: Daily averages are a moving average which includes 14 days before and after

Day	Average (°F)		Record (°F)
Day	High	Low	High	Low
May 1	50.2	23.6	67	3
May 2	50.6	24.0	67	3
May 3	50.9	24.4	69	9
May 4	51.2	24.7	66	11
May 5	51.6	25.1	69	6
May 6	52.0	25.5	70	7
May 7	52.2	25.8	73	5
May 8	52.3	26.1	73	11
May 9	52.6	26.4	73	10
May 10	52.9	26.7	72	7
May 11	53.3	27.0	74	9
May 12	53.6	27.4	73	10
May 13	53.9	27.7	75	13
May 14	54.3	28.1	76	10
May 15	54.7	28.4	74	10
May 16	55.1	28.8	75	12
May 17	55.5	29.2	75	19
May 18	55.9	29.5	73	18
May 19	56.3	29.7	73	11
May 20	56.7	30.0	74	17
May 21	57.0	30.3	74	15
May 22	57.5	30.5	72	21
May 23	57.9	30.8	74	12
May 24	58.2	31.0	73	21
May 25	58.5	31.3	80	21
May 26	58.8	31.6	78	16
May 27	59.1	31.9	75	17
May 28	59.3	32.2	75	21
May 29	59.6	32.4	79	20
May 30	59.7	32.6	82	21
May 31	59.9	32.7	78	19

Weather Station Details

Years	Station	Coordinates
1904–2024	Old Faithful	location