Helena weather by month & the best time to visit
United States · alpine / mountain town · hot-summer continental climate
The best time to visit Helena is July — its sunniest month (Sunshine Score 88/100), with August and September close behind. Helena averages about 2,679 hours of sunshine a year. Daytime highs around 30°C / 86°F and roughly 34 mm of rain in July.
When is the best time to visit Helena?
For sunshine, the best time to visit Helena is July, then August and September. The dullest month is January (0/100, 33 mm of rain). The full month-by-month picture is in the table below.
How sunny is Helena?
Helena gets a lot of sun: around 2,679 hours a year. 88 Sunshine Score points separate July (88) from January (0), so the month you pick matters. It ranks #149 of 580 destinations in United States for annual sunshine, above the national median of 2,279 hours. The year's 548 mm of rain spreads fairly evenly across the months, with no pronounced dry season.
Sunshine Score by month
| Month | Score | Day high | Night low | Rain | UV |
|---|---|---|---|---|---|
| January | 0 | 1° / 34°F | -9° / 16°F | 33 mm | 1 |
| February | 0 | 2° / 36°F | -9° / 16°F | 35 mm | 2 |
| March | 0 | 7° / 45°F | -4° / 25°F | 41 mm | 3 |
| April | 28 | 12° / 54°F | 0° / 32°F | 58 mm | 4 |
| May | 68 | 18° / 64°F | 5° / 41°F | 73 mm | 6 |
| June | 80 | 23° / 73°F | 9° / 48°F | 83 mm | 7 |
| July | 88 | 30° / 86°F | 14° / 57°F | 34 mm | 8 |
| August | 88 | 29° / 84°F | 13° / 55°F | 37 mm | 7 |
| September | 87 | 22° / 72°F | 7° / 45°F | 41 mm | 5 |
| October | 36 | 13° / 55°F | 1° / 34°F | 41 mm | 3 |
| November | 0 | 6° / 43°F | -4° / 25°F | 36 mm | 1 |
| December | 0 | 0° / 32°F | -9° / 16°F | 36 mm | 1 |
Nearest destinations
Helena: questions and answers
What kind of destination is Helena?
Helena is a alpine / mountain town in United States at 1,168 m elevation with a hot-summer continental climate.
How many hours of sunshine does Helena get a year?
Helena gets about 2,679 hours of sunshine a year, at its best around July.
When is the best time to visit Helena?
The sunniest time to visit Helena is July, when the Sunshine Score peaks at 88/100 (with August and September close behind). Expect daytime highs around 30°C / 86°F.
What is the least sunny month in Helena?
January is the least sunny month in Helena, scoring 0/100 with about 33 mm of rain.
How strong is the sun in Helena?
The typical midday UV index in Helena peaks around 8 (very high) in July, easing to about 1 (low) in January. Month-by-month midday UV values are in the UV column of the table on this page.
Put the Helena sunshine badge on your site
A compact badge showing Helena's sunshine at a glance — free to embed under CC BY 4.0. Paste this wherever you'd like it to appear:
Live preview — this is exactly what your readers see: