Long-Range Weather Forecasts for May 2016

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Here is our May monthly snapshot of the U.S. and Canadian Weather forecasts. 

Keep in mind that the forecasts presented below are based on “long-range” weather predictions, which means that they were created many months ago to help gardeners, travelers, and weather watchers plan ahead. See how The Old Farmer’s Almanac predicts the weather.

So, we would advise treating long-range predictions as you might trends, giving you a general sense of typical weather and how much the season might deviate from normal. Weather patterns can shift by a week and unexpected dynamics can occur. Ever year is different! That said, The Old Farmer’s Almanac is traditionally 80% accurate, having predicted weather since George Washington’s days as president.

Find next month’ free long-range forecast here.

For short-term weather forecasts, you can always find our 7-day forecasts here.

May Long-Range Weather Forecast for United States

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Region 1: Northeast

Temp. 56° (1° above avg.); precip. 2.5” (1” below avg.). 1–5 Sunny, warm. 6–10 Showers, then sunny, cool. 11–14 Sunny, warm. 15–20 Showers, cool. 21–31 Sunny, then a few showers, cool.

Region 2: Atlantic Corridor

Temp. 62° (avg.); precip. 4” (avg. north, 2” above south). 1–3 Rainy periods, cool. 4–5 Sunny, warm. 6–11 Rainy periods, cool. 12–20 Scattered showers, turning warm. 21–23 Rainy, cool. 24–31 Scattered t-storms, turning hot.

Region 3: Appalachians 

Temp. 61° (1° above avg.); precip. 6” (2” above avg.). 1–4 Showers, cool. 5–13 Rain, then sunny, turning hot. 14–20 T-storms, then sunny, cool. 21–23 Rainy, cool. 24–28 Sunny, warm. 29–31 T-storms, hot.

Region 4: Southeast

Temp. 71° (avg.); precip. 4” (0.5” above avg.). 1–9 A few t-storms, cool. 10–13 Sunny, warm. 14–20 Scattered t-storms, warm. 21–24 T-storms, then sunny, cool. 25–31 Sunny, turning hot.

Region 5: Florida

Temp. 78° (1° above avg.); precip. 3” (1” below avg.). 1–4 Sunny, warm. 5–8 T-storms, warm. 9–17 Sunny, hot. 18–26 T-storms, then sunny, cool. 27–31 Scattered t-storms.

Region 6: Lower Lakes

Temp. 57.5° (0.5° below avg.); precip. 3” (0.5” below avg.). 1–5 A few showers, cool. 6–11 Sunny, very warm. 12–20 Showers, cool. 21–24 Sunny, nice. 25–31 Scattered t-storms, very warm.

Region 7: Ohio Valley

Temp. 63° (avg.); precip. 2.5” (2” below avg.). 1–9 A few showers, turning warm. 10–13 Sunny, warm. 14–22 A few showers, cool. 23–31 Scattered t-storms, turning very warm.

Region 8: Deep South

Temp. 69° (2° below avg.); precip. 4” (1” below avg.). 1–6 Isolated t-storms, turning cool. 7–15 Sunny, nice. 16–24 T-storms, then sunny, cool. 25–31 Scattered t-storms, warm.

Region 9: Upper Midwest

Temp. 54° (1° below avg.); precip. 4” (1” above avg.). 1–3 Sunny, nice. 4–7 Showers, then sunny, warm. 8–11 Showers, warm. 12–18 Rain, then showers, cool. 19–22 Sunny, nice. 23–26 Showers, cool. 27–31 T-storms, warm.

Region 10: Heartland

Temp. 64° (avg.); precip. 4” (0.5” below avg.). 1–6 T-storms, then sunny, cool. 7–10 Sunny, warm. 11–17 Rainy periods, cool. 18–23 Sunny, cool. 24–31 Scattered t-storms, turning warm.

Region 11: Texas-Oklahoma

Temp. 73.5° (0.5° above avg.); precip. 4” (1” below avg.). 1–6 Scattered t-storms, turning cool. 7–10 Sunny, nice. 11–20 Scattered t-storms, warm. 21–31 Scattered t-storms north, sunny south; warm.

Region 12: High Plains

Temp. 57° (1° below avg.); precip. 2” (0.5” below avg.). 1–7 Scattered showers; warm north, cool south. 8–13 Showers, then sunny, cool. 14–17 Rainy, cool north; sunny, warm south. 18–21 Sunny, warm north; showers south. 22–26 Rainy, cool north; showers, hot south. 27–31 A few showers.

Region 13: Intermountain

Temp. 56° (1° below avg.); precip. 1.5” (0.5” above avg.). 1–3 Sunny; warm north, cool south. 4–12 Showers, then sunny, cool. 13–17 Showers, then sunny; warm north, cool south. 18–22 Rainy periods; warm north, cool south. 23–28 Rainy north, sunny south; cool. 29–31 Sunny.

Region 14: Desert Southwest

Temp. 77° (3° above avg.); precip. 0.5” (avg.). 1–3 Sunny, cool. 4–9 Showers, then sunny, cool. 10–17 Sunny, cool. 18–22 Scattered t-storms, cool. 23–31 Sunny, cool.

Region 15: Pacific Northwest

Temp. 54° (1° below avg.); precip. 2” (avg.). 1–4 Sunny, turning hot. 5–13 Showers, cool. 14–16 Sunny, nice. 17–25 Showers, turning cool. 26–31 Showers, cool.

Region 16: Pacific Southwest

Temp. 61.5° (2° below avg.); precip. 0.8” (0.3” above avg.). 1–9 Sunny, warm inland; a.m. clouds and sprinkles, p.m. sun coast. 10–16 Sunny, cool. 17–22 Showers, cool. 23–26 Sunny, cool. 27–31 Sunny, turning hot inland; a.m. clouds and sprinkles, p.m. sun coast.

Region 17: Alaska

Temp. 22° N, 48° EW (1° above avg.); precip. 0.6” N, 2.5” S (avg. N, 0.5” below S). 1–17 Flurries N+C, showers S; cool. 18–25 Showers, cool. 26–31 Showers, mild N+WC: sunny, turning warm EW.

KEY: Panhandle (P), Aleutians (A), north (N), central (C), south (S), west-central (WC), east-central (EC), south-central (SC), elsewhere (EW)

Region 18: Hawaii

Temp. 77.5° (1° below avg. E, 2° above W); precip. 0.2” (0.5” below avg.). 1–11 Isolated showers; cool, then warm. 12–31 Brief showers C+W, rainy periods E; cool C+E, warm W.

 KEY: east (E), central (C), west (W)

May Long-Range Weather Forecast: Canada

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Region 1: Atlantic Canada

Temp. 8.5°C (1° above avg.); precip. 80mm (40mm below avg.). 1–6 Scattered showers, seasonable. 7–14 Rainy periods, then sunny, warm. 15–21 Scattered showers, seasonable. 22–31 A few showers; warm, then cool.

Region 2: Southern Quebec

Temp. 13.5°C (1°C above avg.); precip. 85mm (20mm above avg.). 1–5 Sunny, warm. 6–14 Showers, warm. 15–21 A few showers, turning cool. 22–26 Sunny, cool. 27–31 Showers, cool.

RÉGION 2: QUÉBEC DU SUD

Temp. 13,5°C (1°C au-dessus de la moy.); précip. 85mm (20mm au-dessus de la moy.). 1–5 Ensoleillé, chaud. 6–14 Averses, chaud. 15–21 Quelques averses, avec refroidissement. 22–26 Ensoleillé, froid. 27–31 Averses, froid.

Region 3: Southern Ontario

Temp. 12.5°C (avg.); precip. 105mm (40mm above avg.). 1–4 Generally sunny, warm. 5–10 Scattered showers; cool, then warm. 11–21 Isolated showers, cool. 22–25 Sunny, cool. 26–31 Showers, turning warm.

Region 4: The Prairies

Temp. 11°C (1°C above avg.); precip. 30mm (10mm below avg.). 1–6 Sunny, warm. 7–15 A few showers, turning cool. 16–20 Scattered showers; somewhat cool east, warm west. 21–31 A few showers, seasonable.

Region 5: Southern British Columbia

Temp. 11°C (avg.); precip. 50mm (avg.). 1–5 Sunny, warm. 6–14 A few showers, cool. 15–22 Scattered showers, mild. 23–31 Scattered showers; cool coast, warm inland. 

Region 6: Yukon

Temp. 7°C (avg.); precip. 60mm (30mm above avg.). 1–7 A few showers, mild. 8–19 Rain and snow, then a few showers; cool. 20–31 Isolated showers, seasonable.

Region 7: Northwest Territories

Temp. 4°C (1°C above avg.); precip. 14mm (avg.). 1–11 Snow, then sunny, turning warm. 12–20 Flurries north, showers south; seasonable. 21–31 Snow, then flurries, cold north; sunny, warm south.

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