Petaluma in May
8.4out of 10
Yes, a good time to go
Mild: highs around 21°C. Very dry: about 3 rainy days.
21°CAvg high
10°CAvg low
3Rainy days (26 mm)
14:04 hDaylight
06:05Sunrise · 20:09 Sunset
Why this score
- Mild: highs around 21°C
- Very dry: about 3 rainy days
What to wear and pack
- Layers you can add or remove
- A light jacket for cooler evenings
- Comfortable walking shoes
How reliable is the forecast?
Rain in May varies a lot between years (±3.2 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 | 14°C | 6°C | 138 mm | 10 | – | – | 6.2 |
| February | 15°C | 6°C | 145 mm | 10 | – | – | 6.5 |
| March | 17°C | 7°C | 107 mm | 9 | – | – | 6.9 |
| April | 18°C | 8°C | 49 mm | 6 | – | – | 7.7 |
| May | 21°C | 10°C | 26 mm | 3 | – | – | 8.4 |
| June | 23°C | 12°C | 6 mm | 1 | – | – | 9.0 |
| July | 24°C | 13°C | 0 mm | 0 | – | – | 9.1 |
| August | 25°C | 13°C | 1 mm | 0 | – | – | 9.1 |
| September | 24°C | 12°C | 3 mm | 1 | – | – | 9.0 |
| October | 22°C | 11°C | 30 mm | 3 | – | – | 8.7 |
| November | 17°C | 8°C | 72 mm | 6 | – | – | 7.5 |
| December | 14°C | 5°C | 140 mm | 10 | – | – | 6.1 |
Frequently asked questions
How hot is Petaluma in May?
Daytime highs average 21°C and nights about 10°C.
When is the best time to visit Petaluma?
The best months are July, August, June, September.