Helena in May
6.2out of 10
Possible, with caveats
Mild: highs around 16°C. Frequent rain: about 14 rainy days.
16°CAvg high
3°CAvg low
14Rainy days (80 mm)
14:49 hDaylight
06:00Sunrise · 20:49 Sunset
Why this score
- Mild: highs around 16°C
- Frequent rain: about 14 rainy days
What to wear and pack
- Layers you can add or remove
- Rain jacket or compact umbrella
How reliable is the forecast?
Rain in May varies a lot between years (±3.3 rainy days), so check the forecast closer to your trip. Averages cover 30 years (1991–2020). Individual days can differ a lot.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | -2°C | -11°C | 24 mm | 7 | – | – | 4.2 |
| February | 0°C | -10°C | 24 mm | 7 | – | – | 4.1 |
| March | 5°C | -6°C | 37 mm | 9 | – | – | 4.6 |
| April | 10°C | -2°C | 62 mm | 12 | – | – | 5.2 |
| May | 16°C | 3°C | 80 mm | 14 | – | – | 6.2 |
| June | 21°C | 7°C | 96 mm | 14 | – | – | 7.0 |
| July | 27°C | 10°C | 44 mm | 9 | – | – | 7.8 |
| August | 27°C | 10°C | 37 mm | 7 | – | – | 8.1 |
| September | 21°C | 6°C | 41 mm | 7 | – | – | 8.0 |
| October | 12°C | 0°C | 38 mm | 8 | – | – | 6.2 |
| November | 3°C | -6°C | 30 mm | 7 | – | – | 4.6 |
| December | -2°C | -10°C | 27 mm | 7 | – | – | 4.1 |
Frequently asked questions
How hot is Helena in May?
Daytime highs average 16°C and nights about 3°C.
When is the best time to visit Helena?
The best months are August, September, July.