Climate averages 1991–2020
Bellingham weather
in May.
A mild, moderately wet month: the 5th warmest and the 5th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a mild month in Bellingham: daytime highs average 15.9°C and nights cool to about 8.1°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 86 mm of rain on roughly 11 days, which makes May a moderately wet month (the 5th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 15 h 14 min on an average May day.
The nearest other city in this atlas is Abbotsford (37 km away). In May its highs average 16.7°C, 0.8°C warmer than Bellingham, with 118 mm of rain.
Among the 498 cities listed in the United States, Bellingham ranks 492nd of 498 for the warmest May highs and joint 259th of 498 for the driest May (rainfall, lowest first). The mean May high of those 498 cities is 23.8°C; Bellingham is 7.9°C cooler than that mean.
From May to June, average highs rise by 2.0°C to 17.9°C, and monthly rainfall falls from 86 mm to 64 mm.
The annual picture
May in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Bellingham climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 6.4°C1.2°C | 1.2°C | 213 | 18.6 | 8.89 h |
| February | 7.8°C1.2°C | 1.2°C | 139 | 15.5 | 10.110 h |
| March | 9.8°C2.6°C | 2.6°C | 171 | 18.9 | 11.912 h |
| April | 12.5°C4.7°C | 4.7°C | 122 | 15.2 | 13.714 h |
| May, selected | 15.9°C8.1°C | 8.1°C | 86 | 11.3 | 15.215 h |
| June | 17.9°C11.1°C | 11.1°C | 64 | 9.4 | 16.116 h |
| July | 21.2°C13.8°C | 13.8°C | 32 | 5.1 | 15.716 h |
| August | 21.7°C14.2°C | 14.2°C | 46 | 5.3 | 14.414 h |
| September | 19.0°C11.8°C | 11.8°C | 81 | 9.1 | 12.613 h |
| October | 13.6°C7.7°C | 7.7°C | 162 | 14.7 | 10.911 h |
| November | 8.7°C3.8°C | 3.8°C | 240 | 18.8 | 9.29 h |
| December | 5.8°C1.3°C | 1.3°C | 206 | 18.3 | 8.48 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
May in nearby cities
- Abbotsford in MayCanada · 37 kmHigh 16.7°C · Low 6.4°C · 118 mm rain
- Langley in MayCanada · 40 kmHigh 17.2°C · Low 7.5°C · 85 mm rain
- Surrey in MayCanada · 46 kmHigh 16.7°C · Low 7.3°C · 85 mm rain
- Maple Ridge in MayCanada · 52 kmHigh 17.1°C · Low 7.2°C · 154 mm rain
- Delta in MayCanada · 55 kmHigh 16.8°C · Low 8.8°C · 69 mm rain
- New Westminster in MayCanada · 59 kmHigh 16.6°C · Low 7.1°C · 117 mm rain
- Chilliwack in MayCanada · 60 kmHigh 17.5°C · Low 8.0°C · 122 mm rain
- Coquitlam in MayCanada · 62 kmHigh 17.4°C · Low 7.7°C · 134 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Bellingham) is explained once on the Bellingham year overview and on the Sources, method and limits page.